Dear subscribers,
This week's selection was compiled by Chao Feng. It contains 43 new abstracts
and 20 replacements.
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arXiv:0812.3567 (*cross-listing*)
Date: Thu, 18 Dec 2008 16:02:20 GMT (165kb)
Title: Feshbach Resonances and Limiting Thermodynamics of Strongly Correlated
Nucleons
Authors: A.Z.Mekjian
Categories: nucl-th cond-mat.quant-gas
Comments: 8 pages, 4 figures
Journal-ref: Phys.Rev.C80:031601,2009
DOI: 10.1103/PhysRevC.80.031601
\\
A finite temperature model of strongly correlated nucleons with underlying
isospin symmetries is developed. The model can be used to study the role of
bound states and Feshbach resonances on the thermal properties of a spin 1/2,
isospin 1/2 system of protons and neutrons by varying the proton fraction. An
analysis of features associated with a universal thermodynamic limit or unitary
limit is given. In the limit of very large scattering length, the effective
range to quantum thermal wavelength appears as a limiting scale in an
interaction energy and equation of state.
\\ ( http://arxiv.org/abs/0812.3567 , 165kb)
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arXiv:0910.1652
Date: Fri, 9 Oct 2009 05:32:16 GMT (27kb)
Title: Realization of effective super Tonks-Girardeau gases via strongly
attractive one-dimensional Fermi gases
Authors: Shu Chen, Xi-Wen Guan, Xiangguo Yin, Liming Guan and Murray T
Batchelor
Categories: cond-mat.quant-gas cond-mat.stat-mech
Comments: 4 pages, 2 figures
\\
A significant feature of the one-dimensional super Tonks-Girardeau gas is its
metastable gas-like state with a stronger Fermi-like pressure than for free
fermions which prevents a collapse of atoms. This naturally suggests a way to
search for such strongly correlated behaviour in systems of interacting
fermions in one dimension. We thus show that the strongly attractive Fermi gas
without polarization can be effectively described by a super Tonks-Girardeau
gas composed of bosonic Fermi pairs with attractive pair-pair interaction. A
natural description of such super Tonks-Girardeau gases is provided by Haldane
generalized exclusion statistics. In particular, we find that they are
equivalent to ideal particles obeying more exclusive statistics than
Fermi-Dirac statistics.
\\ ( http://arxiv.org/abs/0910.1652 , 27kb)
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arXiv:0910.1658
Date: Fri, 9 Oct 2009 06:49:34 GMT (23kb)
Title: Separability of N-particle Fermionic States for Arbitrary Partitions
Authors: Tsubasa Ichikawa, Toshihiko Sasaki, Izumi Tsutsui
Categories: quant-ph
Comments: 17 pages, 1 figure
\\
We present a criterion of separability for arbitrary s partitions of
N-particle fermionic pure states. We show that, despite the superficial
non-factorizability due to the antisymmetry required by the
indistinguishability of the particles, the states which meet our criterion have
factorizable correlations for a class of observables which are specified
consistently with the states. The separable states and the associated class of
observables share an orthogonal structure, whose non-uniqueness is found to be
intrinsic to the multi-partite separability and leads to the non-transitivity
in the factorizability in general. Our result generalizes the previous result
obtained by Ghirardi et. al. [J. Stat. Phys. 108 (2002) 49] for the s = 2 and s
= N case.
\\ ( http://arxiv.org/abs/0910.1658 , 23kb)
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arXiv:0910.1689
Date: Fri, 9 Oct 2009 09:13:48 GMT (1259kb)
Title: Excitation of coherent polaritons in a two-dimensional atomic lattice
Authors: I.O. Barinov, A.P. Alodjants, S.M. Arakelian
Categories: quant-ph
Comments: 8 pages, 3 figures
Journal-ref: I.O. Barinov, A.P. Alodjants, S.M. Arakelian, Excitation of
coherent polaritons, Quantum Electronics 39 (7) 685 - 690 (2009)
DOI: 10.1070/QE2009v039n07ABEH014020
\\
We describe a new type of spatially periodic structure (lattice models): a
polaritonic crystal (PolC) formed by a two-dimensional lattice of trapped
two-level atoms interacting with quantised electromagnetic field in a cavity
(or in a one-dimensional array of tunnelling-coupled microcavities), which
allows polaritons to be fully localised. Using a one-dimensional polaritonic
crystal as an example, we analyse conditions for quantum degeneracy of a
low-branch polariton gas and those for quantum optical information recording
and storage.
\\ ( http://arxiv.org/abs/0910.1689 , 1259kb)
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arXiv:0910.1717
Date: Fri, 9 Oct 2009 11:45:04 GMT (56kb)
Title: Constructing classical field for a Bose-Einstein condensate in arbitrary
trapping potential; quadrupole oscillations at nonzero temperatures
Authors: Tomasz Karpiuk, Miroslaw Brewczyk, Mariusz Gajda, Kazimierz Rzazewski
Categories: cond-mat.quant-gas
Comments: 9 pages, 9 figures
\\
We optimize the classical field approximation in a version described in J.
Phys. B 40, R1 (2007) for the oscillations of a Bose gas trapped in a harmonic
potential at nonzero temperatures as experimentally investigated by Jin et al.
[Phys. Rev. Lett. 78, 764 (1997)]. Similarly to experiment, the system response
to external perturbation strongly depends on the initial temperature and on the
symmetry of perturbation. While for lower temperatures the thermal cloud
follows the condensed part, for higher temperatures the thermal atoms rather
oscillate with their natural frequency whereas the condensate exhibits the
frequency shift toward the thermal cloud frequency (m=0 mode) or in the
opposite direction (m=2 mode). In the latter case for temperatures approaching
the critical one we find that the condensate begins to oscillate, as in m=0
mode, with the frequency of the thermal atoms.
\\ ( http://arxiv.org/abs/0910.1717 , 56kb)
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arXiv:0910.1749
Date: Fri, 9 Oct 2009 14:41:16 GMT (186kb)
Title: Local and non-local relaxation of a 1D Bose gas with finite interactions
Authors: Dominik Muth, Bernd Schmidt, and Michael Fleischhauer
Categories: quant-ph cond-mat.quant-gas
Comments: 4 pages, 4 figures
\\
We study the relaxation dynamics of a one-dimensional Bose gas after a sudden
change of the interaction strength from zero to a finite value using the
numerical time-evolving block decimation (TEBD) algorithm. It is shown that
local quantities equilibrate to a steady-state value on a short universal time
scale if the interactions are sufficiently strong, i.e. for Tonks parameter
larger than unity. The relaxation of non-local quantities such as
density-density correlations on the other hand is determined by the finite
propagation velocity of oscillatory correlation waves. Although the system is
integrable the steady-state values of local quantities match within the
achievable accuracy to predictions from finite-temperature Bethe-Ansatz in the
grand canonical ensemble.
\\ ( http://arxiv.org/abs/0910.1749 , 186kb)
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arXiv:0910.1765
Date: Fri, 9 Oct 2009 14:49:16 GMT (234kb)
Title: Entanglement of two interacting bosons in a two dimensional isotropic
harmonic trap
Authors: B. Sun and M. Pindzola
Categories: quant-ph cond-mat.quant-gas
Comments: 5 figures
Journal-ref: Physics Letters A, Volume 373, Issue 42, 12 October 2009, Pages
3833-3837
DOI: 10.1016/j.physleta.2009.08.035
\\
We compute the pair entanglement between two interacting bosons in a two
dimensional (2D)isotropic harmonic trap. The interaction potential is modeled
by a 2D regularized pseudo-potential. By analytically decomposing the wave
function into the single particle basis, we show the dependency of the pair
entanglement on the scattering length. Our results turn out to be in good
agreements with earlier results using a quasi-2D geometry.
\\ ( http://arxiv.org/abs/0910.1765 , 234kb)
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arXiv:0910.1773
Date: Fri, 9 Oct 2009 15:08:58 GMT (65kb)
Title: Dynamics of a two-species Bose-Einstein condensate in a double well
Authors: B. Sun and M. S. Pindzola
Categories: cond-mat.stat-mech cond-mat.quant-gas
Comments: 7 pages, 5 figures
Journal-ref: Phys. Rev. A 80, 033616 (2009)
DOI: 10.1103/PhysRevA.80.033616
\\
We study the dynamics of a two-species Bose-Einstein condensate in a double
well. Such a system is characterized by the intraspecies and interspecies
s-wave scattering as well as the Josephson tunneling between the two wells and
the population transfer between the two species. We investigate the dynamics
for some interesting regimes and present numerical results to support our
conclusions. In the case of vanishing intraspecies scattering lengths and a
weak interspecies scattering length, we find collapses and revivals in the
population dynamics. A possible experimental implementation of our proposal is
briefly discussed.
\\ ( http://arxiv.org/abs/0910.1773 , 65kb)
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arXiv:0910.1776
Date: Fri, 9 Oct 2009 15:16:43 GMT (82kb)
Title: Observing collapse in two colliding dipolar Bose-Einstein condensates
Authors: B. Sun and M. S. Pindzola
Categories: cond-mat.stat-mech cond-mat.quant-gas
Comments: 6 pages, 7 figures
Journal-ref: J. Phys. B: At. Mol. Opt. Phys. 42 No 17 (14 September 2009)
175301
DOI: 10.1088/0953-4075/42/17/175301
\\
We study the collision of two Bose-Einstein condensates with pure dipolar
interaction. A stationary pure dipolar condensate is known to be stable when
the atom number is below a critical value. However, collapse can occur during
the collision between two condensates due to local density fluctuations even if
the total atom number is only a fraction of the critical value. Using full
three-dimensional numerical simulations, we observe the collapse induced by
local density fluctuations. For the purpose of future experiments, we present
the time dependence of the density distribution, energy per particle and the
maximal density of the condensate. We also discuss the collapse time as a
function of the relative phase between the two condensates.
\\ ( http://arxiv.org/abs/0910.1776 , 82kb)
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arXiv:0910.1803
Date: Fri, 9 Oct 2009 17:55:36 GMT (478kb,D)
Title: Pi-phases in balanced fermionic superfluids on spin-dependent optical
lattices
Authors: I. Zapata and B. Wunsch and N. T. Zinner and E. Demler
Categories: cond-mat.quant-gas cond-mat.str-el
Comments: 4 pages, 4 figures
\\
We study a balanced two-component system of ultracold fermions in one
dimension with attractive interactions and subject to a spin-dependent optical
lattice potential of opposite sign for the two components. The ground-state
develops a non-trivial superconducting order parameter as the depth of the
lattice is increased. The real-space gap parameter changes sign and is
analogous to the Fulde-Ferrell-Larkin-Ovchnnikov states discussed in the
context of superconductors in magnetic fields. We discuss how to observe these
$\pi$-phases using the rapid-ramp technique. In addition we discuss laser
setups that can produce the required lattices needed for these novel phases to
appear.
\\ ( http://arxiv.org/abs/0910.1803 , 478kb)
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arXiv:0910.1827
Date: Fri, 9 Oct 2009 19:41:19 GMT (142kb)
Title: Tracking spin and charge with spectroscopy in spin-polarised 1D systems
Authors: Tobias Ulbricht and Peter Schmitteckert
Categories: cond-mat.str-el
Comments: 5 pages, 4 figures
\\
We calculate the spectral function of a one-dimensional strongly interacting
chain of fermions, where the response can be well understood in terms of spinon
and holon excitations. Upon increasing the spin imbalance between the spin
species, we observe the single-electron response of the fully polarised system
to emanate from the holon peak while the spinon response vanishes. For
experimental setups that probe one-dimensional properties, we propose this
method as an additional generic tool to aid the identification of spectral
structures, e.g. in ARPES measurements. We show that this applies even to
trapped systems having cold atomic gas experiments in mind.
\\ ( http://arxiv.org/abs/0910.1827 , 142kb)
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arXiv:0910.1859
Date: Fri, 9 Oct 2009 20:52:55 GMT (625kb,D)
Title: Observability of Quantum Criticality and a Continuous Supersolid in
Atomic Gases
Authors: S. Diehl, M. Baranov, A. J. Daley, P. Zoller
Categories: cond-mat.quant-gas
Comments: 4+ pages, 2 figures
\\
We analyze the Bose-Hubbard model with three-body onsite hardcore constraint,
which stabilizes the system for an attractive interparticle interaction and
allows, in particular, the formation of a superfluid phase of bosonic dimers.
Our approach is based on an exact mapping of the constrained Hamiltonian to a
theory of two coupled bosonic degrees of freedom. We demonstrate that the phase
transition between atomic and dimer superfluidity is generically of the first
order as a result of the Coleman-Weinberg phenomenon, while at unit filling we
identify an Ising quantum critical point. At this filling, furthermore, a
symmetry enhancement in the strong coupling limit leads to a continuous
supersolid phase for deeply bound dimers, observable in experiments.
\\ ( http://arxiv.org/abs/0910.1859 , 625kb)
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arXiv:0910.1873
Date: Fri, 9 Oct 2009 22:43:20 GMT (185kb,D)
Title: Matter Wave Scattering from Ultracold Atoms in an Optical Lattice
Authors: Scott N. Sanders (1 and 2), Florian Mintert (3), Eric J. Heller (1)
((1) Harvard University, (2) Massachusetts Institute of Technology, (3)
Albert-Ludwigs-Universit\"at Freiburg)
Categories: cond-mat.quant-gas
Comments: 4 pages, 2 figures
\\
We study matter wave scattering from an ultracold, many body atomic system
trapped in an optical lattice. We determine the angular cross section that a
matter wave probe sees and show that it is strongly affected by the many body
phase, superfluid or Mott insulator, of the target lattice. We determine these
cross sections analytically in the first Born approximation, and we examine the
variation at intermediate points in the phase transition by numerically
diagonalizing the Bose Hubbard Hamiltonian for a small lattice. We show that
matter wave scattering offers a convenient method for non-destructively probing
the quantum many body phase transition of atoms in an optical lattice.
\\ ( http://arxiv.org/abs/0910.1873 , 185kb)
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arXiv:0910.1973
Date: Sun, 11 Oct 2009 06:01:44 GMT (850kb)
Title: Studying the normal-fluid flow in Helium-II using metastable helium
molecules
Authors: W. Guo, J.D. Wright, S.B. Cahn, J.A. Nikkel, D.N. McKinsey
Categories: physics.atom-ph physics.gen-ph
Comments: 6 pages, 4 figures. Accepted by Journal of Low Temperature Physics
\\
We demonstrate that metastable helium molecules can be used as tracers to
visualize the flow of the normal fluid in superfluid $^{4}$He using a
laser-induced-fluorescence technique. The flow pattern of a normal-fluid jet
impinging on the center of a copper disc is imaged. A ring-shaped circulation
structure of the normal fluid is observed as the jet passes across the disc
surface. The fluorescence signal for the molecules trapped in the circulation
structure is measured as a function of time after we turn off the molecule
source. The radiative lifetime and density of the molecules can be determined
by fitting the measured data using a simple analytic model. We also discuss a
proposed experiment on using a previously developed molecule tagging-imaging
technique to visualize the normal-fluid velocity profile during the transition
of quantum turbulence in a thermal counterflow channel.
\\ ( http://arxiv.org/abs/0910.1973 , 850kb)
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arXiv:0910.2064
Date: Mon, 12 Oct 2009 00:57:53 GMT (284kb)
Title: Magnetic blackbody shift of hyperfine transitions for atomic clocks
Authors: J. C. Berengut, V. V. Flambaum, J. King-Lacroix
Categories: physics.atom-ph
\\
We derive an expression for the magnetic blackbody shift of hyperfine
transitions such as the cesium primary reference transition which defines the
second. The shift is found to be a complicated function of temperature, and has
a T^2 dependence only in the high-temperature limit. We also calculate the
shift of ground-state p_1/2 hyperfine transitions which have been proposed as
new atomic clock transitions. In this case interaction with the p_3/2
fine-structure multiplet may be the dominant effect.
\\ ( http://arxiv.org/abs/0910.2064 , 284kb)
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arXiv:0910.2074
Date: Mon, 12 Oct 2009 03:38:47 GMT (146kb)
Title: Precession of Vortices in Dilute Bose-Einstein Condensates at Finite
Temperature
Authors: B. G. Wild and D. A. W. Hutchinson
Categories: cond-mat.quant-gas
Comments: 5 pages, 2 figures
Journal-ref: Phys. Rev. A 80, 035603 (2009)
DOI: 10.1103/PhysRev.140.A452
\\
We demonstrate that the precessional frequencies of vortices in Bose Einstein
condensates (BECs) are determined by a conservation law, and not by the lowest
lying excitation energy mode. We determine the precessional frequency for a
single off-axis vortex and vortex lattices in BECs using the continuity
equation, and solve this self-consistently with the time-independent
Hartree-Fock-Bogoliubov (HFB) equations in the rotating frame. We find
agreement with zero temperature calculations (Bogoliubov approximation), and a
smooth variation in the precession frequency as the temperature is increased.
Time-dependent solutions confirm the validity of these predictions.
\\ ( http://arxiv.org/abs/0910.2074 , 146kb)
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arXiv:0910.2165
Date: Mon, 12 Oct 2009 13:49:59 GMT (36kb)
Title: Condensation transition in a model with attractive particles and
non-local hops
Authors: Apoorva Nagar
Categories: cond-mat.stat-mech
Comments: 11 Pages, 6 Figures. Published in Journal of Statistical Mechanics:
Theory and Experiment
Journal-ref: J. Stat. Mech. (2009) P10003
\\
We study a one dimensional nonequilibrium lattice model with competing
features of particle attraction and non-local hops. The system is similar to a
zero range process (ZRP) with attractive particles but the particles can make
both local and non-local hops. The length of the non-local hop is dependent on
the occupancy of the chosen site and its probability is given by the parameter
$p$. Our numerical results show that the system undergoes a phase transition
from a condensate phase to a homogeneous density phase as $p$ is increased
beyond a critical value $p_c$. A mean-field approximation does not predict a
phase transition and describes only the condensate phase. We provide heuristic
arguments for understanding the numerical results.
\\ ( http://arxiv.org/abs/0910.2165 , 36kb)
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arXiv:0910.2191 (*cross-listing*)
Date: Mon, 12 Oct 2009 16:12:42 GMT (70kb)
Title: On the modification of the Efimov spectrum in a finite cubic box
Authors: Simon Kreuzer, H.-W. Hammer (Bonn U.)
Categories: nucl-th cond-mat.quant-gas hep-lat
Comments: 20 pages, 8 figures
Report-no: HISKP-TH-09-32
\\
Three particles with large scattering length display a universal spectrum of
three-body bound states called "Efimov trimers''. We calculate the modification
of the Efimov trimers of three identical bosons in a finite cubic box and
compute the dependence of their energies on the box size using effective field
theory. Previous calculations for positive scattering length that were
perturbative in the finite volume energy shift are extended to arbitrarily
large shifts and negative scattering lengths. The renormalization of the
effective field theory in the finite volume is explicitly verified. Moreover,
we investigate the effects of partial wave mixing and study the behavior of
shallow trimers near the dimer energy. Finally, we provide numerical evidence
for universal scaling of the finite volume corrections.
\\ ( http://arxiv.org/abs/0910.2191 , 70kb)
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arXiv:0910.2203
Date: Mon, 12 Oct 2009 17:17:49 GMT (35kb)
Title: Phase diagram of the triangular lattice spin-1/2 XXZ model: A
variational viewpoint
Authors: Dariush Heidarian and Arun Paramekanti
Categories: cond-mat.str-el
Comments: 4 pages and 4 figures
\\
We study the spin-1/2 XXZ model on the triangular lattice with a nearest
neighbor antiferromagnetic Ising coupling $J_z>0$ and unfrustrated
($J_\perp<0$) or frustrated ($J_\perp>0$) kinetic terms in zero magnetic field.
Incorporating long-range Jastrow correlations over a mean field spin state, we
obtain the variational phase diagram of this model on large lattices for
arbitrary $J_z$ and either sign of $J_\perp$. For $J_\perp<0$, we find a
$\sqrt{3}\times\sqrt{3}$ supersolid for $J_z/|J_\perp| \gtrsim 4.7$, in
excellent agreement with quantum Monte Carlo data. For $J_\perp >0$, a distinct
$\sqrt{3}\times\sqrt{3}$ supersolid is found to emerge for $J_z/J_\perp \geq
1$. Both supersolids exhibit a spontaneous density deviation from half-filling.
At $J_z/J_\perp=\infty$, the crystalline order parameters of these two
supersolids are nearly identical, consistent with exact results.
\\ ( http://arxiv.org/abs/0910.2203 , 35kb)
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arXiv:0910.2269
Date: Mon, 12 Oct 2009 23:32:43 GMT (633kb)
Title: Exact Solution for 1D Spin-Polarized Fermions with Resonant Interactions
Authors: Adilet Imambekov, Alexander A. Lukyanov, Leonid I. Glazman, Vladimir
Gritsev
Categories: cond-mat.quant-gas cond-mat.str-el
\\
Using asymptotic Bethe Ansatz, we obtain an exact solution of the many-body
problem for 1D spin-polarized fermions with resonant p-wave interactions,
taking into account effects of both scattering volume and effective range.
Under typical experimental conditions, accounting for the effective range
significantly modifies the properties of the system in the resonant regime.
Excitation spectrum of the considered model has several unexpected features,
such as the inverted position of particle-like and hole-like branches at small
momenta, and roton-like minima. We find that the frequency of the "breathing"
mode under harmonic confinement provides an unambiguous signature of the
effective range of interactions at resonant scattering.
\\ ( http://arxiv.org/abs/0910.2269 , 633kb)
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arXiv:0910.2332
Date: Tue, 13 Oct 2009 08:28:41 GMT (268kb)
Title: Trapping of ultra-cold atoms with the magnetic field of vortices in a
thin film superconducting micro-structure
Authors: T. M\"uller, B. Zhang, R. Fermani, K.S. Chan, Z.W. Wang, C.B. Zhang,
M.J. Lim, R. Dumke
Categories: physics.atom-ph
Comments: 4pages, comments are welcome
\\
We store and control ultra-cold atoms in a new type of trap using magnetic
fields of vortices in a high temperature superconducting micro-structure. This
is the first time ultra-cold atoms have been trapped in the field of magnetic
flux quanta. We generate the attractive trapping potential for the atoms by
combining the magnetic field of a superconductor in the remanent state with
external homogeneous magnetic fields. We show the control of crucial atom trap
characteristics such as an efficient intrinsic loading mechanism, spatial
positioning of the trapped atoms and the vortex density in the superconductor.
The measured trap characteristics are in good agreement with our numerical
simulations.
\\ ( http://arxiv.org/abs/0910.2332 , 268kb)
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arXiv:0910.2345
Date: Tue, 13 Oct 2009 09:28:40 GMT (268kb)
Title: Giant Variations of Cooper-Pair Size in Nanoscale Superconductors
Authors: A. A. Shanenko, M. D. Croitoru, A. Vagov, and F. M. Peeters
Categories: cond-mat.supr-con cond-mat.mes-hall
\\
The Cooper-pair size (i.e., the BCS coherence length) in low-dimensional
superconductors is dramatically modified by quantum-size effects. In
particular, for nanowires made of conventional superconducting materials, we
show that the coherence length exhibits size-dependent drops by two-three
orders of magnitude and reaches values found in high-$T_c$ superconductors.
This phenomenon is surprisingly similar to the well-known BCS-BEC crossover but
with one important exception: it is driven by the transverse quantization of
the electron spectrum rather than by the strength of the fermion-fermion
interaction. Similar results can be expected for other systems with the same
structure of the single-particle spectrum, e.g, for superfluid Fermi gases
confined in a quantum-wire or quantum-well geometry.
\\ ( http://arxiv.org/abs/0910.2345 , 268kb)
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arXiv:0910.2431
Date: Tue, 13 Oct 2009 16:24:10 GMT (70kb)
Title: Crystalline phase of fermion pairs made in the p-wave Wannier orbital
Authors: Zixu Zhang, Hsiang-Hsuan Hung, Chiu Man Ho, Erhai Zhao, W. Vincent Liu
Categories: cond-mat.quant-gas cond-mat.str-el
\\
We study an attractive Fermi gas in a quasi-1D optical lattice under a new
condition of large spin imbalance--the spin up and down Fermi levels are
adjusted in the different $p_x$ and $s$ Wannier orbital bands, respectively.
This triggers a new pairing state with two distinctive features absent in
previously known superfluids. First, the interaction between different spins
produces unconventional fermion pairs, which are in the p-wave Wannier orbital,
not the usual nodeless s-wave. Second, the condensate of such pairs leads to a
modulated superfluid with wave vector $Q=k_{F\uparrow}+k_{F\downarrow}$, rather
than the Fermi wavevector difference characteristic of the
Fulde-Ferrell-Larkin-Ovchinnikov phase. Our analysis combines the methods of
mean field theory and density matrix renormalization group. Unique features of
this state are predicted for the proposed molecule projection experiment.
\\ ( http://arxiv.org/abs/0910.2431 , 70kb)
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arXiv:0910.2450
Date: Tue, 13 Oct 2009 18:44:16 GMT (54kb)
Title: Detecting antiferromagnetism of atoms in an optical lattice via optical
Bragg scattering
Authors: T. A. Corcovilos, S. K. Baur, J. M. Hitchcock, E. J. Mueller, R. G.
Hulet
Categories: cond-mat.quant-gas
Comments: 9 pages, 6 figures, 1 table; RevTeX4; submitted to Phys. Rev. A
\\
Antiferromagnetism of ultracold fermions in an optical lattice can be
detected by Bragg diffraction of light, in analogy to the diffraction of
neutrons from solid state materials. A finite sublattice magnetization will
lead to a Bragg peak from the (1/2 1/2 1/2) crystal plane with an intensity
depending on details of the atomic states, the frequency and polarization of
the probe beam, the direction and magnitude of the sublattice magnetization,
and the finite optical density of the sample. Accounting for these effects we
make quantitative predictions about the scattering intensity and find that with
experimentally feasible parameters the signal can be readily measured with a
CCD camera or a photodiode and used to detect antiferromagnetic order.
\\ ( http://arxiv.org/abs/0910.2450 , 54kb)
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arXiv:0910.2471
Date: Tue, 13 Oct 2009 20:52:35 GMT (292kb)
Title: Power law behavior associated with a Fibonacci Lucas model and
generalized statistical models
Authors: Aram Z. Mekjian
Categories: cond-mat.stat-mech cond-mat.dis-nn
Comments: 33 pages, 10 figures,2 tables
\\
A Fibonacci-Lucas based statistical model and several other related models
are studied. The canonical and grand canonical partition functions for these
models are developed.Partition structure such as the distribution of sizes as
in a cluster distribution is explored.Ensemble averaging over all partitions
leads to a scale invariant power law behavior at a particular critical like
point. The canonical ensemble of the Fibonacci-Lucas case involves the
Gegenbauer polynomial.The model has a hyperbolic power law behavior, a feature
linked to the golden mean ratio of two adjacent Fibonacci numbers and also the
connection of Lucas numbers to the golden mean. The relation to other power law
behavior, such as Zipf and Pareto laws, is mentioned. For the cases considered,
the grand canonical ensemble involves the Gauss hypergeometric function
F(a,b,c,z) with specific values for a,b,c. The general case has a variable
power law behavior with tau exponent equal to1+c-a-b. An application with
a=1/2, b=1, c=3 and thus tau=5/2 very closely approximates Bose-Einstein
condensation. The zeta function zeta(3/2)=2.61 of the exact theory is replaced
with 8/3 and zeta(5/2)= 1.34 with 4/3. At the condensation point the number of
cycles of length falls as a scale invariant power law. The cycles, which arise
from permutation symmetries associated with Bose-Einstein statistics, can be
viewed as links in a complex network of connections between particles. This
scale invariant power law parallels that seen in complex networks. The growth
of the network is developed using recurrence properties of the model.
Constraints imposed by the canonical ensemble and associates correlations lead
to some number theoretic connections between Fibonacci and Lucas numbers as an
incidental consequence of this approach.
\\ ( http://arxiv.org/abs/0910.2471 , 292kb)
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arXiv:0910.2499
Date: Wed, 14 Oct 2009 00:09:41 GMT (27kb)
Title: Reduction and Emergence in Bose-Einstein Condensates
Authors: Richard Healey
Categories: quant-ph
\\
A closer look at some proposed Gedanken-experiments on BECs promises to shed
light on several aspects of reduction and emergence in physics. These include
the relations between classical descriptions and different quantum treatments
of macroscopic systems, and the emergence of new properties and even new
objects as a result of spontaneous symmetry breaking.
\\ ( http://arxiv.org/abs/0910.2499 , 27kb)
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arXiv:0910.2564
Date: Wed, 14 Oct 2009 09:24:28 GMT (703kb)
Title: Localization-Delocalization Transition in Ultracold Atomic Mixtures
Authors: Jean-Fran\c{c}ois Schaff, Zehra Akdeniz, Patrizia Vignolo (INLN,
Universit\'e de Nice, CNRS, France; Piri Reis University, Istanbul, Turkey)
Categories: cond-mat.quant-gas
Comments: 5 pages, 4 figures
\\
We propose an experiment to study the transport properties of a Bose-Einstein
condensate in the presence of short-range correlated disorder where defects
appear as dimers (random-dimer model). We suggest an experimental scheme and
calculate the parameters entering the effective Hamiltonian for a realistic
experiment where a first atomic species plays the role of impurities for the
second one. We show that a localization-delocalization transition occurs when
the interspecies scattering length is increased, and evaluate the localization
length and the transmittivity across this transition.
\\ ( http://arxiv.org/abs/0910.2564 , 703kb)
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arXiv:0910.2570 (*cross-listing*)
Date: Wed, 14 Oct 2009 18:49:35 GMT (33kb)
Title: Decoherence and thermalization of a pure quantum state in quantum field
theory
Authors: Alexandre Giraud and Julien Serreau
Categories: hep-ph astro-ph.CO cond-mat.other hep-th nucl-th
Comments: 4 pages, 3 figures
\\
We study the real-time evolution of a self-interacting O(N) scalar field
initially prepared in a pure quantum state. We present a complete solution of
the nonequilibrium quantum dynamics from a 1/N-expansion of the
two-particle-irreducible effective action at next-to-leading order, which
includes scattering and memory effects. Restricting one's attention (or ability
to measure) to a subset of the infinite hierarchy of correlation functions, the
system is described by an effective (reduced) density matrix which, unlike the
full density matrix, has a nontrivial time evolution. In particular, starting
from a pure quantum state, we observe the loss of putity/coherence and, on
longer time scales, thermalization of the reduced density matrix. We point out
that the physics of decoherence is well described by classical statistical
field theory.
\\ ( http://arxiv.org/abs/0910.2570 , 33kb)
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arXiv:0910.2577
Date: Wed, 14 Oct 2009 15:14:12 GMT (20kb)
Title: A novel general mapping for bosonic and fermionic operators in Fock
space
Authors: Alexej I. Streltsov, Ofir E. Alon, and Lorenz S. Cederbaum
Categories: quant-ph
Comments: 29 pages
\\
In this paper we provide a novel and general way to construct the result of
the action of any bosonic or fermionic operator represented in second quantized
form on a state vector, without resorting to the matrix representation of
operators and even to its elements. The new approach is based on our proposal
to compactly enumerate the configurations (i.e., determinants for fermions,
permanents for bosons) which are the elements of the state vector. This
extremely simplifies the calculation of the action of an operator on a state
vector. The computations of statical properties and of the evolution dynamics
of a system become much more efficient and applications to systems made of more
particles become feasible. Explicit formulations are given for spin-polarized
fermionic systems and spinless bosonic systems, as well as to general
(two-component) fermionic systems, two-component bosonic systems, and mixtures
thereof.
\\ ( http://arxiv.org/abs/0910.2577 , 20kb)
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arXiv:0910.2598
Date: Wed, 14 Oct 2009 12:18:05 GMT (356kb)
Title: Nanowire atomchip traps for sub-micron atom-surface distances
Authors: R. Salem, Y. Japha, J. Chab\'e, B. Hadad, M. Keil, K. A. Milton and R.
Folman
Categories: quant-ph cond-mat.quant-gas
Comments: 19 pages, 10 figure in 14 files
\\
We present an analysis of magnetic traps for ultracold atoms based on
current-carrying wires with sub-micron dimensions. We analyze the physical
limitations of these conducting wires, as well as how such miniaturized
magnetic traps are affected by the nearby surface due to tunneling to the
surface, surface thermal noise, electron scattering within the wire, and the
Casimir-Polder force. We show that wires with cross sections as small as a few
tens of nanometers should enable robust operating conditions for coherent atom
optics (e.g. tunneling barriers for interferometry). In particular, trap sizes
on the order of the deBroglie wavelength become accessible, based solely on
static magnetic fields, thereby bringing the atomchip a step closer to
fulfilling its promise of a compact device for complex and accurate quantum
optics with ultracold atoms.
\\ ( http://arxiv.org/abs/0910.2598 , 356kb)
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arXiv:0910.2610
Date: Wed, 14 Oct 2009 13:13:18 GMT (2072kb)
Title: Artificial Staggered Magnetic Field for Ultracold Atoms in Optical
Lattices
Authors: Lih-King Lim, Andreas Hemmerich, and C. Morais Smith
Categories: cond-mat.quant-gas cond-mat.supr-con
Comments: 14 pages, 5 figures
\\
We consider a time-dependent optical lattice with staggered particle current
in the tight-binding regime and show that it can be described by a
time-independent effective lattice model with an artificial staggered magnetic
field. The low energy description of a single-component fermion in this lattice
at half-filling is provided by two copies of ideal two-dimensional massless
Dirac fermions. The Dirac cones are generally anisotropic and can be tuned by
the external staggered flux $\p$. For bosons, the staggered flux modifies the
single-particle spectrum such that in the weak coupling limit, depending on the
flux $\p$, distinct superfluid phases are realized. We discuss their
properties, establish the nature of the phase transitions between them and use
Bogoliubov theory to determine their excitation spectra. Finally, we study the
generalized superfluid-Mott insulator transition in the presence of the
staggered flux and thus establish the complete phase diagram.
\\ ( http://arxiv.org/abs/0910.2610 , 2072kb)
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arXiv:0910.2679
Date: Wed, 14 Oct 2009 17:55:58 GMT (50kb)
Title: Time evolution of a two-atom dressed entangled state in a cavity
Authors: E.R. Granhen, C.A. Linhares, A.P.C. Malbouisson, J.M.C. Malbouisson
Categories: quant-ph
Comments: 12 pages, 2 figures
\\
We study the time evolution of superposition of product states of two dressed
atoms in a spherical cavity in the extreme situations of an arbitrarily large
cavity (free space) and of a small one. In the large-cavity case, the system
dissipates, whereas, for the small finite cavity, the system evolves in an
oscillating way and never completely decays. We also compute the von Neumann
entropy for such a system, a measurement of the degree of entanglement of the
two atoms, as the superposed state evolves in time. We find that this entropy
does not depend on time, nor on the size of the cavity.
\\ ( http://arxiv.org/abs/0910.2679 , 50kb)
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arXiv:0910.2693
Date: Wed, 14 Oct 2009 19:56:35 GMT (128kb)
Title: Universal Short-Distance Structure of the Single-Particle Spectral
Function of Dilute Fermi Gases
Authors: William Schneider, Mohit Randeria
Categories: cond-mat.quant-gas
Comments: 4 pages, 4 figures
\\
The universal $1/k4$ tail in the momentum distribution of dilute Fermi gases
implies that the spectral function $A(\kk,\omega)$ must have weight below the
chemical potential for large momentum $k \gg k_F$, with observable consequences
in RF spectroscopy experiments. We show that this incoherent spectral weight is
centered about $\omega \simeq - \epsilon(\kk)$ in a range of energies of order
$v_F k$. This "bending back" in the dispersion, while natural for superfluids,
is quite surprising for normal gases. We show that this universal structure is
present in the hard-sphere gas as well as the Fermi liquid ground state of the
highly imbalanced, attractive gas near unitarity. We argue that, even in the
BCS superfluid, this bending back at large $k$ is dominated by interaction
effects which do not reflect the pairing gap.
\\ ( http://arxiv.org/abs/0910.2693 , 128kb)
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arXiv:0910.2711
Date: Wed, 14 Oct 2009 20:15:03 GMT (703kb)
Title: Reentrant stability of BEC standing wave patterns
Authors: Ryan M. Kalas, Dmitry Solenov, and Eddy Timmermans
Categories: cond-mat.quant-gas
Comments: 13 pages, 9 figures
\\
We describe standing wave patterns induced by an attractive finite-ranged
external potential inside a large Bose-Einstein Condensate (BEC). As the
potential depth increases, the time independent Gross-Pitaevskii equation
develops pairs of solutions that have nodes in their wavefunction. We elucidate
the nature of these states and study their dynamical stability. Although we
study the problem in a two-dimensional BEC subject to a cylindrically symmetric
square-well potential of a radius that is comparable to the coherence length of
the BEC, our analysis reveals general trends, valid in two and three
dimensions, independent of the symmetry of the localized potential well, and
suggestive of the behavior in general, short- and large-range potentials. One
set of nodal BEC wavefunctions resembles the single particle n node bound state
wavefunction of the potential well, the other wavefunctions resemble the n-1
node bound-state wavefunction with a kink state pinned by the potential. The
second state, though corresponding to the lower free energy value of the pair
of n node BEC states, is always unstable, whereas the first can be dynamically
stable in intervals of the potential well depth, implying that the standing
wave BEC can evolve from a dynamically unstable to stable, and back to unstable
status as the potential well is adiabatically deepened, a phenomenon that we
refer to as "reentrant dynamical stability".
\\ ( http://arxiv.org/abs/0910.2711 , 703kb)
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arXiv:0910.2727
Date: Wed, 14 Oct 2009 20:43:39 GMT (483kb)
Title: Vortices in exciton-polariton condensates with polarization splitting
Authors: M. Toledo Solano, Yuri G. Rubo
Categories: cond-mat.mes-hall
Comments: 4 pages, 2 figs, Optics of Excitons in Confined Systems 11 (Madrid,
7-11 september 2009)
\\
The presence of polarization splitting of exciton-polariton branches in
planar semiconductor microcavities has a pronounced effect on vortices in
polariton condensates. We show that the TE-TM splitting leads to the coupling
between the left and right half-vortices (vortices in the right and left
circular components of the condensate), that otherwise do not interact. We
analyze also the effect of linear polarization pinning resulted from a fixed
splitting between two perpendicular linear polarizations. In this case,
half-vortices acquire strings (solitons) attached to them. The half-vortices
with strings can be detected by observing the interference fringes of light
emitted from the cavity in two circular polarizations. The string affects the
fringes in both polarizations. Namely, the half-vortex is characterized by an
asymmetric fork-like dislocation in one circular polarization; the fringes in
the other circular polarization are continuous, but they are shifted by
crossing the string.
\\ ( http://arxiv.org/abs/0910.2727 , 483kb)
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arXiv:0910.2729
Date: Wed, 14 Oct 2009 20:50:50 GMT (761kb)
Title: Generation of vortices and observation of Quantum Turbulence in an
oscillating Bose-Einstein Condensate
Authors: E.A.L. Henn, J.A. Seman, G. Roati, K.M.F. Magalhaes, and V.S. Bagnato
Categories: cond-mat.quant-gas
Comments: to appear in JLTP - QFS 2009
\\
We report on the experimental observation of vortex formation and production
of tangled vortex distribution in an atomic BEC of Rb-87 atoms submitted to an
external oscillatory perturbation. The oscillatory perturbations start by
exciting quadrupolar and scissors modes of the condensate. Then regular
vortices are observed finally evolving to a vortex tangle configuration. The
vortex tangle is a signature of the presence of a turbulent regime in the
cloud. We also show that this turbulent cloud has suppression of the aspect
ratio inversion typically observed in quantum degenerate bosonic gases during
free expansion.
\\ ( http://arxiv.org/abs/0910.2729 , 761kb)
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arXiv:0910.2775
Date: Thu, 15 Oct 2009 05:51:04 GMT (408kb)
Title: Stable Fractional Vortices in the Cyclic States of Bose-Einstein
Condensates
Authors: J. A. M. Huhtam\"aki, T. P. Simula, M. Kobayashi, and K. Machida
Categories: cond-mat.quant-gas
Comments: 5 pages, 2 figures
\\
We propose methods to create fractional vortices in the cyclic state of an F
= 2 spinor Bose-Einstein condensate by manipulating its internal spin structure
using pulsed microwave and laser fields. The stability of such vortices is
studied as a function of the rotation frequency of the confining harmonic trap
both in pancake and cigar shaped condensates. We find a range of parameters for
which the so-called 1/3-vortex state is energetically favorable. Such
fractional vortices could be created in condensates of 87Rb atoms using current
experimental techniques facilitating probing of topological defects with
non-Abelian statistics.
\\ ( http://arxiv.org/abs/0910.2775 , 408kb)
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arXiv:0910.2791
Date: Thu, 15 Oct 2009 09:07:39 GMT (1090kb)
Title: A Soluble Model of Quantum Turbulence
Authors: Tzihong Chiueh, Tak-Pong Woo, Hung-Yu Jian and Hsi-Yu Schive
Categories: quant-ph
Comments: 9 pages, 14 figures
\\
Quantum turbulence with vortex creation and annihilation is demonstrated as a
solution of the time-dependent, free-particle Schroedinger equation with
large-scale random-phased initial conditions. It is shown that quantum vortex
is not frozen to the fluid, nor is its motion entirely induced by other
vortices via Biot-Savart law. Thus, quantum vortex is a wave phenomenon with a
distinct propagation speed. Relaxed quantum turbulence of 2D and 3D exhibits
universal scaling in the steady-state energy spectrum as $k^{-1}$, but no
evidence of Kolmogorov-type forward energy cascade in 3D or inverse energy
cascade in 2D is found. On the other hand, universal vortex-vortex two-point
correlation only exists in 3D, scaled as $\Delta r^{-2}$, where $\Delta r$ is
the separation between two vortex elements. Finally, we found that helical
short waves, the Kelvin waves, are commonly in presence at the 3D vortex core.
\\ ( http://arxiv.org/abs/0910.2791 , 1090kb)
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arXiv:0910.2805
Date: Thu, 15 Oct 2009 08:51:08 GMT (915kb)
Title: Metastable quantum phase transitions in a periodic one-dimensional Bose
gas: II. Many-body theory
Authors: R. Kanamoto, L.D. Carr, M. Ueda
Categories: cond-mat.quant-gas
Comments: 14 pages, 10 figures
\\
We show that quantum solitons in the Lieb-Liniger Hamiltonian are precisely
the yrast states. We identify such solutions clearly with Lieb's type II
excitations from weak to strong interactions, clarifying a long-standing
question of the physical meaning of this excitation branch. We demonstrate that
the metastable quantum phase transition previously found in mean field analysis
of the weakly-interacting Lieb-Liniger Hamiltonian [Phys. Rev. A {\bf 79},
063616 (2009)] extends into the medium- to strongly-interacting regime of a
periodic one-dimensional Bose gas. Our methods are exact diagonalization,
finite-size Bethe ansatz, and the boson-fermion mapping in the Tonks-Girardeau
limit.
\\ ( http://arxiv.org/abs/0910.2805 , 915kb)
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arXiv:0910.2834
Date: Thu, 15 Oct 2009 10:42:10 GMT (88kb)
Title: Energy Content of Quantum Systems and the Alleged Collapse of the
Wavefunction
Authors: Peter J. Riggs
Categories: quant-ph
Comments: 10 pages, no figures, also published in: Quantum Causality:
Conceptual Issues in the Causal Theory of Quantum Mechanics (Springer, 2009)
DOI: 10.1007/978-90-481-2403-9
\\
It is shown that within a quantum system, the wave field has a (potential)
energy content that can be exchanged with quantum particles. Energy
conservation in quantum systems holds if potential energy is correctly taken to
be a field attribute. From this perspective, a transfer of energy occurs on
measurement from the wave field to a quantum particle and this provides a
physical explanation of what is commonly referred to as the collapse of the
wavefunction.
\\ ( http://arxiv.org/abs/0910.2834 , 88kb)
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arXiv:0910.2867
Date: Thu, 15 Oct 2009 13:13:49 GMT (22kb)
Title: Uncertainty relations of Statistical Mechanics
Authors: L. Velazquez and S. Curilef
Categories: cond-mat.stat-mech
Comments: Version accepted for publication in Mod. Phys. Lett. B
\\
Recently, we have presented some simple arguments supporting the existence of
certain complementarity between thermodynamic quantities of temperature and
energy, an idea suggested by Bohr and Heinsenberg in the early days of Quantum
Mechanics. Such a complementarity is expressed as the impossibility of perform
an exact simultaneous determination of the system energy and temperature by
using an experimental procedure based on the thermal equilibrium with other
system regarded as a measure apparatus (thermometer). In this work, we provide
a simple generalization of this latter approach with the consideration of a
thermodynamic situation with several control parameters.
\\ ( http://arxiv.org/abs/0910.2867 , 22kb)
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arXiv:0910.2939
Date: Thu, 15 Oct 2009 17:08:35 GMT (11kb)
Title: Approaches in evaluating two-time correlation function
Authors: Sintayehu Tesfa
Categories: quant-ph
Comments: 7 pages, no figure
\\
Derivation of the procedures that can be applied in evaluating two-time
correlation function in terms of coherent-state propagator and corresponding
Q-function is presented. On the basis that the involved functions are generally
exponential in nature, obtaining the two-time second-order correlation function
is essentially claimed to be reduced to carrying out relatively simple
integrations. Fundamentally, the time dependence of the operators is
transferred to the density operator. Moreover, manipulation in reordering the
operators is performed by applying the usual trace operation. With all details,
it is basically observed that the two-time correlation can be readily
determined once the pertinent coherent-state propagator or Q-function is known.
Since working with c-number equation is far more handy than the associated
operator equation, it is expected that the results derived in this contribution
can aid in easing the otherwise involving mathematical rigor.
\\ ( http://arxiv.org/abs/0910.2939 , 11kb)
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arXiv:0910.2978
Date: Thu, 15 Oct 2009 19:35:58 GMT (527kb)
Date (revised v2): Thu, 15 Oct 2009 21:33:06 GMT (243kb)
Title: Higher order coherence of exciton-polariton condensates
Authors: Tomoyuki Horikiri, Paolo Schwendimann, Antonio Quattropani, Sven
Hofling, Alfred Forchel, Yoshihisa Yamamoto
Categories: cond-mat.mes-hall cond-mat.other
Comments: 4 pages, 4 figures
\\
The second and third order coherence functions $g^{(n)}(0) (n=2 {\rm and} 3)$
of an exciton-polariton condensate is measured and compared to the theory.
Contrary to an ideal photon laser, deviation from unity in the second and third
order coherence functions is observed, thus showing a bunching effect, but not
the characteristics of a standard thermal state with $g^{(n)}(0)=n!$. The
increase of bunching with the order of the coherence function, $g^{(3)}(0) >
g^{(2)}(0)>1$, indicates that the polariton condensate is different from
coherent state, number state and thermal state. The experimental results are in
agreement with the theoretical model where polariton-polariton and
polariton-phonon interactions are responsible for the loss of temporal
coherence.
\\ ( http://arxiv.org/abs/0910.2978 , 243kb)
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arXiv:0809.1818 (*cross-listing*)
replaced with revised version Wed, 14 Oct 2009 15:15:24 GMT (36kb)
Title: The giant vortex state for a Bose-Einstein condensate in a rotating
anharmonic trap : extreme rotation regimes
Authors: Nicolas Rougerie
Categories: math-ph cond-mat.other math.MP
Comments: 44 pages, new results added, proofs corrected, title changed
MSC-class: 35Q55,47J30,76M23
\\ ( http://arxiv.org/abs/0809.1818 , 36kb)
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arXiv:0811.2845
replaced with revised version Sun, 11 Oct 2009 03:09:51 GMT (660kb)
Title: Magnetic order, Bose-Einstein condensation, and superfluidity in a
bosonic t-J model of CP^1 spinons and doped Higgs holons
Authors: Koji Aoki, Kazuhiko Sakakibara, Ikuo Ichinose, Tetsuo Matsui
Categories: cond-mat.str-el cond-mat.supr-con
Comments: Title changed, Corected typos. 14 pages, 17 figures
Journal-ref: Physical Review B 80 (2009) 144510
DOI: 10.1103/PhysRevB.80.144510
\\ ( http://arxiv.org/abs/0811.2845 , 660kb)
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arXiv:0901.1763
replaced with revised version Wed, 14 Oct 2009 13:10:48 GMT (2295kb)
Title: Spinor condensate of $^{87}$Rb as a dipolar gas
Authors: Tomasz \'Swis{\l}ocki, Miros{\l}aw Brewczyk, Mariusz Gajda, Kazimierz
Rz\k{a}\.zewski
Categories: cond-mat.other
\\ ( http://arxiv.org/abs/0901.1763 , 2295kb)
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arXiv:0902.4119
replaced with revised version Tue, 13 Oct 2009 08:06:59 GMT (36kb)
Title: Multiple condensed phases in attractively interacting Bose systems
Authors: M. M\"annel, K. Morawetz, P. Lipavsk\'y
Categories: cond-mat.stat-mech nucl-th
\\ ( http://arxiv.org/abs/0902.4119 , 36kb)
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arXiv:0903.4823
replaced with revised version Thu, 8 Oct 2009 22:52:00 GMT (1550kb)
Title: Quantum transport through a Tonks-Girardeau gas
Authors: Stefan Palzer, Christoph Zipkes, Carlo Sias, and Michael K\"ohl
Categories: cond-mat.mes-hall cond-mat.quant-gas
Journal-ref: Phys. Rev. Lett. 103, 150601 (2009)
DOI: 10.1103/PhysRevLett.103.150601
\\ ( http://arxiv.org/abs/0903.4823 , 1550kb)
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arXiv:0903.4837
replaced with revised version Tue, 13 Oct 2009 14:31:04 GMT (960kb,D)
Title: Experimental demonstration of single-site addressability in a
two-dimensional optical lattice
Authors: Peter W\"urtz, Tim Langen, Tatjana Gericke, Andreas Koglbauer, Herwig
Ott
Categories: cond-mat.other quant-ph
Comments: 4 pages, 5 figures
Journal-ref: Phys. Rev. Lett. 103, 080404 (2009)
DOI: 10.1103/PhysRevLett.103.080404
\\ ( http://arxiv.org/abs/0903.4837 , 960kb)
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arXiv:0903.5016
replaced with revised version Wed, 14 Oct 2009 19:01:48 GMT (1564kb)
Title: Pulsating and persistent vector solitons in a Bose-Einstein condensate
in a lattice upon phase separation instability
Authors: Uttam Shrestha, Juha Javanainen, and Janne Ruostekoski
Categories: cond-mat.other cond-mat.quant-gas nlin.PS quant-ph
Comments: submitted to PRL
\\ ( http://arxiv.org/abs/0903.5016 , 1564kb)
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arXiv:0904.0418
replaced with revised version Fri, 9 Oct 2009 02:18:34 GMT (218kb,D)
Title: Quantum Darwinism in a hazy environment
Authors: Michael Zwolak, H. T. Quan, Wojciech H. Zurek
Categories: quant-ph
Comments: 4 pages, 3 figures
Report-no: LAUR-09-01899
Journal-ref: Phys. Rev. Lett. 103, 110402 (2009)
DOI: 10.1103/PhysRevLett.103.110402
\\ ( http://arxiv.org/abs/0904.0418 , 218kb)
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arXiv:0904.2409
replaced with revised version Fri, 9 Oct 2009 00:57:30 GMT (390kb)
Title: Critical velocity of a clean one-dimensional superconductor
Authors: Tzu-Chieh Wei (University of Waterloo) and Paul M. Goldbart
(University of Illinois at Urbana-Champaign)
Categories: cond-mat.supr-con
Comments: Single column, double space, 24 pages, 10 figures
Journal-ref: Phys. Rev. B 80, 134507 (2009)
DOI: 10.1103/PhysRevB.80.134507
\\ ( http://arxiv.org/abs/0904.2409 , 390kb)
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arXiv:0905.3533
replaced with revised version Mon, 12 Oct 2009 17:58:46 GMT (10kb)
Title: Horizon in Random Matrix Theory, Hawking Radiation and Flow of Cold
Atoms
Authors: Fabio Franchini, Vladimir E. Kravtsov
Categories: cond-mat.str-el cond-mat.mes-hall gr-qc quant-ph
Comments: 4 pages, no figures. PRL accepted version
Journal-ref: Phys. Rev. Lett. 103, 166401 (2009)
\\ ( http://arxiv.org/abs/0905.3533 , 10kb)
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arXiv:0905.4783
replaced with revised version Tue, 13 Oct 2009 07:26:37 GMT (108kb)
Title: Critical temperature of a Bose gas in an optical lattice
Authors: D. Baillie and P. B. Blakie
Categories: cond-mat.quant-gas
Comments: 4 pages, 4 figures
Journal-ref: Phys. Rev. A (80), 031603(R) (2009)
DOI: 10.1103/PhysRevA.80.031603
\\ ( http://arxiv.org/abs/0905.4783 , 108kb)
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arXiv:0906.2314
replaced with revised version Sat, 10 Oct 2009 08:41:15 GMT (235kb)
Title: Decay of superfluid currents in the interacting one-dimensional Bose gas
Authors: Alexander Yu. Cherny, Jean-Sebastien Caux, and Joachim Brand
Categories: cond-mat.quant-gas cond-mat.stat-mech
Comments: 5 pages, 4 figures
Journal-ref: Phys. Rev. A 80, 043604 (2009)
DOI: 10.1103/PhysRevA.80.043604
\\ ( http://arxiv.org/abs/0906.2314 , 235kb)
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arXiv:0906.4606
replaced with revised version Tue, 13 Oct 2009 10:04:23 GMT (588kb)
Title: Finite temperature theory of superfluid bosons in optical lattices
Authors: D. Baillie and P. B. Blakie
Categories: cond-mat.quant-gas
Comments: 22 pages, 18 figures, reorganized appendices, moved figures,
corrected typos
Journal-ref: Phys. Rev. A (80), 033620 (2009)
DOI: 10.1103/PhysRevA.80.033620
\\ ( http://arxiv.org/abs/0906.4606 , 588kb)
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arXiv:0906.4731
replaced with revised version Tue, 13 Oct 2009 17:21:49 GMT (56kb)
Title: Observation of universality in ultracold 7Li three-body recombination
Authors: Noam Gross, Zav Shotan, Servaas Kokkelmans and Lev Khaykovich
Categories: cond-mat.other
Comments: 5 pages, 2 figures
Journal-ref: Phys. Rev. Lett. 103, 163202 (2009)
DOI: 10.1103/PhysRevLett.103.163202
\\ ( http://arxiv.org/abs/0906.4731 , 56kb)
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arXiv:0907.0267
replaced with revised version Thu, 15 Oct 2009 16:26:43 GMT (401kb)
Title: Universal Dephasing of Many-Body Rabi Oscillations of Atoms in
One-Dimensional Traps
Authors: Sebastian D. Huber and Ehud Altman
Categories: cond-mat.quant-gas cond-mat.str-el
Comments: 4 pages, 2 figures
Journal-ref: Phys. Rev. Lett. 103, 160402 (2009)
DOI: 10.1103/PhysRevLett.103.160402
\\ ( http://arxiv.org/abs/0907.0267 , 401kb)
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arXiv:0907.1434 (*cross-listing*)
replaced with revised version Wed, 14 Oct 2009 09:47:47 GMT (62kb)
Title: Holographic dual of Cold Trapped Fermions
Authors: Sang-Jin Sin and Ismail Zahed
Categories: hep-th cond-mat.str-el
Comments: 22 page latex, v2:reference added, sec.7's title change. v3) c_V
recalculated
\\ ( http://arxiv.org/abs/0907.1434 , 62kb)
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arXiv:0907.3080
replaced with revised version Sat, 10 Oct 2009 06:12:32 GMT (37kb)
Title: Stable Topological Superfluid Phase of Ultracold Polar Fermionic
Molecules
Authors: N. R. Cooper and G. V. Shlyapnikov
Categories: cond-mat.quant-gas cond-mat.str-el
Journal-ref: Phys. Rev. Lett. 103, 155302 (2009)
DOI: 10.1103/PhysRevLett.103.155302
\\ ( http://arxiv.org/abs/0907.3080 , 37kb)
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arXiv:0907.5523
replaced with revised version Wed, 14 Oct 2009 15:39:07 GMT (53kb,D)
Title: Atom-dimer scattering and long-lived trimers in fermionic mixtures
Authors: J. Levinsen, T. G. Tiecke, J. T. M. Walraven, D. S. Petrov
Categories: cond-mat.quant-gas cond-mat.other
Comments: 4 pages, 2 figures, published version
Journal-ref: Phys. Rev. Lett. 103, 153202 (2009)
\\ ( http://arxiv.org/abs/0907.5523 , 53kb)
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\\
arXiv:0909.5553
replaced with revised version Sat, 10 Oct 2009 07:21:32 GMT (13kb)
Title: Off-diagonal Long-Range Order and Supersolidity in a Quantum Solid with
Vacancies
Authors: Yu Shi, Yin Yang, Shao-Ming Fei
Categories: cond-mat.other
Comments: 12 pages. A few references are added. To appear in PRB
\\ ( http://arxiv.org/abs/0909.5553 , 13kb)
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\\
arXiv:0910.0247
replaced with revised version Thu, 15 Oct 2009 17:39:28 GMT (75kb)
Title: Theory of Magnetic Field-Induced Bose-Einstein Condensation of Triplons
in Ba3Cr2O8
Authors: Tyler Dodds, Bohm-Jung Yang, and Yong Baek Kim
Categories: cond-mat.str-el
Comments: 10 pages, 13 figures. Corrected typo; references added
\\ ( http://arxiv.org/abs/0910.0247 , 75kb)
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Till next time,
Matt.
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The University of Queensland, fax : +61 7 336 51242
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Australia. www.physics.uq.edu.au/people/mdavis/
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