The following message was sent to the matts_arxiv list by Matthew Davis <mdavis_at_physics.uq.edu.au>
Hi all,
With this message I'm now only four days behind schedule... another busy week
with 31 new preprints and 9 replacements.
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arXiv:0711.4840
Date: Thu, 29 Nov 2007 22:13:33 GMT (507kb)
Title: Entanglement, Non-linear Dynamics and Heisenberg Limit with
Bose-Einstein Condensates
Authors: L. Pezze' and A. Smerzi
Categories: quant-ph
Comments: 4 pages, 2 figures
\\
We introduce a condition which is sufficient for particle-entanglement and
necessary and sufficient for sub shot-noise phase sensitivity in the estimation
of a collective rotation angle $\theta$. The connection is provided by the
Fisher information which is a simple measure of the statistical distance among
quantum states. We study the production of this \emph{useful} entanglement by
the non-linear evolution of two decoupled Bose-Einstein condensates or trapped
ions.
\\ ( http://arxiv.org/abs/0711.4840 , 507kb)
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arXiv:0711.4870
Date: Fri, 30 Nov 2007 04:38:31 GMT (59kb)
Title: Bright bichromatic entanglement and quantum dynamics of sum frequency
generation
Authors: M.K. Olsen, A.S. Bradley
Categories: quant-ph
\\
We investigate the quantum properties of the well-known process of sum
frequency generation, showing that it is potentially a very useful source of
non-classical states of the electromagnetic field, some of which are not
possible with the more common techniques. We show that it can produce
quadrature squeezed light, bright bichromatic entangled states and symmetric
and asymmetric demonstrations of the Einstein-Podolsky-Rosen paradox. We also
show that the semiclassical equations totally fail to describe the mean-field
dynamics when the cavity is strongly pumped.
\\ ( http://arxiv.org/abs/0711.4870 , 59kb)
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arXiv:0711.4960
Date: Fri, 30 Nov 2007 15:45:19 GMT (253kb)
Title: Coherent backscattering of light from saturated atoms
Authors: Vyacheslav Shatokhin, Thomas Wellens, Cord M\"uller, and Andreas
Buchleitner
Categories: quant-ph
Comments: 5 pages, 4 figures
\\
We survey recent progress achieved in understanding the impact of inelastic
processes on coherent backscattering of light from cold atoms that are
saturated by a powerful laser field.
\\ ( http://arxiv.org/abs/0711.4960 , 253kb)
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arXiv:0711.4786 (*cross-listing*)
Date: Thu, 29 Nov 2007 17:55:32 GMT (34kb)
Title: Discovery of exceptional points in the Bose-Einstein condensation of
gases with attractive 1/r-interaction
Authors: Holger Cartarius, J\"org Main, G\"unter Wunner
Categories: nlin.CD quant-ph
Comments: 9 pages, 6 figures
\\
The extended Gross-Pitaevskii equation for the Bose-Einstein condensation of
gases with attractive 1/r-interaction has a second solution which is born
together with the ground state in a tangent bifurcation. At the bifurcation
point both states coalesce, i.e., the energies and the wave functions are
identical. We investigate the bifurcation point in the context of exceptional
points, a phenomenon known for linear non-Hermitian Hamiltonians. We point out
that the mean field energy, the chemical potential, and the wave functions show
the same behavior as an exceptional point in a linear, non-symmetric system.
The analysis of the analytically continued Gross-Pitaevskii equation reveals
complex waves at negative scattering lengths below the tangent bifurcation.
These solutions are interpreted as a decay of the condensate caused by an
absorbing potential.
\\ ( http://arxiv.org/abs/0711.4786 , 34kb)
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arXiv:0711.4846
Date: Thu, 29 Nov 2007 22:44:41 GMT (154kb)
Title: Collisional Control of Ground State Polar Molecules and Universal
Dipolar Scattering
Authors: Christopher Ticknor
Categories: physics.atom-ph
Comments: 4 pages, 2 figures
\\
We explore the impact of the short range interaction on the scattering of
ground state polar molecules, and study the transition from a weak to strong
dipolar scattering over an experimentally reasonable range of energies and
electric field values. In the strong dipolar limit, the scattering scales with
respect to a dimensionless quantity defined by mass, induced dipole moment, and
collision energy. The scaling has implications for all quantum mechanical
dipolar scattering, and therefore this universal dipolar scaling provides
estimates of scattering cross sections for any dipolar system.
\\ ( http://arxiv.org/abs/0711.4846 , 154kb)
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arXiv:0711.4636 (*cross-listing*)
Date: Thu, 29 Nov 2007 00:57:33 GMT (67kb)
Title: Testing Atom and Neutron Neutrality with Atom Interferometry
Authors: Asimina Arvanitaki, Savas Dimopoulos, Andrew A. Geraci, Jason Hogan,
and Mark Kasevich
Categories: hep-ph hep-ex hep-th physics.atom-ph
Comments: 4 pages, 2 figures, to be submitted for publication in PRL
\\
We propose an atom-interferometry experiment based on the scalar
Aharonov-Bohm effect which detects an atom charge at the 10^{-28}e level, and
improves the current laboratory limits by 8 orders of magnitude. This setup
independently probes neutron charges down to 10^{-28}e, 7 orders of magnitude
below current bounds.
\\ ( http://arxiv.org/abs/0711.4636 , 67kb)
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arXiv:0712.0037
Date: Sat, 1 Dec 2007 01:49:28 GMT (149kb)
Title: Comparative study of strong coupling theories of a trapped Fermi gas at
unitarity
Authors: Hui Hu, Xia-Ji Liu, and Peter D. Drummond
Categories: cond-mat.stat-mech cond-mat.supr-con
Comments: 4 pages and 3 figures; To be submitted
\\
We present a systematic comparison of the most recent thermodynamic
measurements of a trapped Fermi gas at unitarity, with the predictions from
available strong coupling theories, including quantum Monte Carlo (MC)
simulations. The exceptional accuracy of the experimental data, of the order of
a few percent, allows a precision test of different many-body approaches. We
find that the simple Nozieres and Schmitt-Rink treatment of fluctuations is in
excellent agreement with the experimental data and available MC calculations at
unitarity.
\\ ( http://arxiv.org/abs/0712.0037 , 149kb)
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arXiv:0712.0044
Date: Sat, 1 Dec 2007 04:09:24 GMT (5kb)
Title: Quantum Statistical Transition
Authors: Tao Wang
Categories: cond-mat.stat-mech cond-mat.str-el
Comments: 5 pages no figures
\\
By analyzing the BCS-BEC crossover, I found that because of the pairing
interactions,a continuous family of quantum statistics interpolating between
fermions and bosons is possible, although it seems incapable to construct
reasonable wave function.
\\ ( http://arxiv.org/abs/0712.0044 , 5kb)
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arXiv:0712.0205
Date: Mon, 3 Dec 2007 14:01:20 GMT (9kb)
Title: Self-consistent equations of unitary fermion thermodynamics with elusive
non-Gaussian correlations
Authors: Ji-sheng Chen, Jia-rong Li, Yan-ping Wang, Xiang-jun Xia
Categories: cond-mat.stat-mech
Comments: 5 pages
\\
We study the dynamical high order perturbation and statistically nonlinear
infrared fluctuation/correlation role on the unitary fermion gas
thermodynamics. Due to the significant quantum levels rearrangement, the
spontaneously generated entropy departing from the mean field theory formalism
leads to the concise analytical thermodynamical expressions. With the exact
scaling equation of state, the dimensionless virial coefficients are calculated
up to the fourth order and are found to be proportional to those of the ideal
non-interacting quantum gas with integer ratios. Intriguingly, contrary to
those for the ideal bosons ($a^{(0)}_2=-\frac{1}{2 \sqrt{2} g}$) or fermions
($a^{(0)}_2=\frac{1}{2 \sqrt{2} g}$) in the high temperature weak degenerate
Boltzmann regime, the second virial coefficient of unitary gas is equal to zero
$a_2=0$. At the BCS-BEC crossover point, the novel quantum thermodynamics
manifests the famous pure classical Boyle characteristic by keeping up to the
second virial.
\\ ( http://arxiv.org/abs/0712.0205 , 9kb)
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arXiv:0712.0251
Date: Mon, 3 Dec 2007 10:31:35 GMT (41kb)
Title: Superfluid, solid, supersolid and quantum phase transitions on bipartite
lattices and its applications on ultra-cold atoms on optical lattices, adatom
adsorption on substrates and high temperature superconductors
Authors: Jinwu Ye
Categories: cond-mat.stat-mech cond-mat.str-el
Comments: 12 pages, 5 figures, REVTEX4, long version of cond-mat/0503113
\\
We study phases such as superfluid, solid, supersolid and quantum phase
transitions in a unified scheme in extended boson Hubbard models slightly away
from half filling on bipartite optical lattices such as honeycomb and square
lattice. We also map out its global phase diagram at $ T=0 $. We find that in
the translational symmetry breaking side, different kinds of supersolids are
generic possible states slightly away from half filling. We propose a new kind
of supersolid: valence bond supersolid. We show that the quantum phase
transitions from solids to supersolids driven by a chemical potential are in
the same universality class as that from a Mott insulator to a superfluid,
therefore have exact exponents $ z=2, \nu=1/2, \eta=0 $ with a logarithmic
correction. Comparisons with previous quantum Monte-Carlo (QMC) simulations on
a square lattice are made. Implications on possible future QMC simulations are
given. All these phases and phase transitions can be realized in ultra-cold
atoms loaded on optical bipartite lattices. Then we use our results to study
the reentrant "superfluid" in a narrow region of coverages in the second layer
of $^{4}He $ adsorbed on graphite and the low temperature phase diagram of
Hydrogen physisorbed on Krypton-preplated graphite ($ H_2 $/Kr/graphite) near
half filling. We suggest that $^{4}He $ and $ H_2 $ lattice supersolids maybe
responsible for the experimental signals in the two systems. Finally, we
suggest Cooper supersolid is repressible for the phase diagram of $ La_{2-x}
Ba_{x} Cu O_{4} $ near $ x=1/8 $.
\\ ( http://arxiv.org/abs/0712.0251 , 41kb)
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arXiv:0712.0311
Date: Mon, 3 Dec 2007 15:14:09 GMT (802kb,D)
Title: Exploring the growth of correlations in a quasi one-dimensional trapped
Bose gas
Authors: M. Eckart, R. Walser and W.P. Schleich
Categories: cond-mat.mes-hall
Comments: 36 pages, 21 color pdf/jpeg figures, submitted to NJP
\\
Phase correlations, density fluctuations and three-body loss rates are
relevant for many experiments in quasi one-dimensional geometries. Extended
mean-field theory is used to evaluate correlation functions up to third order
for a quasi one-dimensional trapped Bose gas at zero and finite temperature. At
zero temperature and in the homogeneous limit, we also study the transition
from the weakly correlated Gross-Pitaevskii regime to the strongly correlated
Tonks-Girardeau regime analytically. We compare our results with the exact
Lieb-Liniger solution for the homogeneous case and find good agreement up to
the cross-over regime.
\\ ( http://arxiv.org/abs/0712.0311 , 802kb)
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arXiv:0712.0348
Date: Mon, 3 Dec 2007 17:12:06 GMT (166kb)
Title: Entanglement renormalization and topological order
Authors: Miguel Aguado, Guifre Vidal
Categories: cond-mat.str-el
Comments: 6 pages, 17 eps files
\\
The multi-scale entanglement renormalisation ansatz (MERA) is argued to
provide a natural description for topological states of matter. The case of
Kitaev's toric code is analyzed in detail and shown to possess a remarkably
simple MERA description leading to distillation of the topological degrees of
freedom at the top of the tensor network. Kitaev states on an infinite lattice
are also shown to be a fixed point of the RG flow associated with entanglement
renormalization. All these results generalize to arbitrary quantum double
models.
\\ ( http://arxiv.org/abs/0712.0348 , 166kb)
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arXiv:0712.0355
Date: Mon, 3 Dec 2007 18:08:50 GMT (40kb)
Title: Bright and dark solitary waves in a one-dimensional spin-polarized gas
of fermionic atoms with p-wave interactions in a hard-wall trap
Authors: M.D. Girardeau, E.M. Wright
Categories: cond-mat.other
Comments: 4 pages+, 3 figures, revtex4. Submitted to PRL
\\
In this paper we elucidate the physics underlying the fact that both bright
and dark solitary waves can arise in a one-dimensional spin-polarized gas of
fermionic atoms with attractive three-dimensional p-wave interactions in a
hard-wall trap. This is possible since the one-dimensional fermion system can
be mapped to a system of bosons described by the Lieb-Liniger model with either
repulsive or attractive delta-function interactions which can support solitary
waves.
\\ ( http://arxiv.org/abs/0712.0355 , 40kb)
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arXiv:0712.0376
Date: Mon, 3 Dec 2007 20:38:08 GMT (6kb)
Title: Analog gravity with spinor Bose-Einstein condensates
Authors: E. Calzetta
Categories: cond-mat.other
Comments: 4 pages
\\
It is well known that both a particle with spin and a quantum field in a
Bianchi type IX Universe are both related to the quantum mechanical top. In
this paper we will combine these insights to show that the dynamics of a cold
gas of noninteracting atoms with total momentum F=1 may be used to explore the
behavior of quantum matter near a cosmological singularity.
\\ ( http://arxiv.org/abs/0712.0376 , 6kb)
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arXiv:0711.4840 (*cross-listing*)
Date: Thu, 29 Nov 2007 22:13:33 GMT (507kb)
Date (revised v2): Fri, 30 Nov 2007 21:35:10 GMT (507kb)
Title: Entanglement, Non-linear Dynamics and Heisenberg Limit with
Bose-Einstein Condensates
Authors: L. Pezze' and A. Smerzi
Categories: quant-ph cond-mat.other
Comments: 4 pages, 2 figures
\\
We introduce a condition which is sufficient for particle-entanglement and
necessary and sufficient for sub shot-noise phase sensitivity in the estimation
of a collective rotation angle $\theta$. The connection is provided by the
Fisher information which is a simple measure of the statistical distance among
quantum states. We study the production of this \emph{useful} entanglement by
the non-linear evolution of two decoupled Bose-Einstein condensates or trapped
ions.
\\ ( http://arxiv.org/abs/0711.4840 , 507kb)
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arXiv:0711.4954 (*cross-listing*)
Date: Fri, 30 Nov 2007 15:11:37 GMT (238kb)
Title: The Vacuum Fluctuation Theorem: Exact Schroedinger Equation via
Nonequilibrium Thermodynamics
Authors: Gerhard Groessing
Categories: quant-ph cond-mat.stat-mech physics.hist-ph
Comments: 39 pages
\\
By assuming that a particle of energy hbar.omega is actually a dissipative
system maintained in a nonequilibrium steady state by a constant throughput of
energy (heat flow), the exact Schroedinger equation is derived, both for
conservative and nonconservative systems. Thereby, only universal properties of
oscillators and nonequilibrium thermostatting are used, such that a maximal
model independence of the hypothesised sub-quantum physics is guaranteed. It is
claimed that this represents the shortest derivation of the Schroedinger
equation from (modern) classical physics in the literature, and the only exact
one, too. Moreover, a "vacuum fluctuation theorem" is presented, with
particular emphasis on possible applications for a better understanding of
quantum mechanical nonlocal effects.
\\ ( http://arxiv.org/abs/0711.4954 , 238kb)
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arXiv:0712.0060
Date: Sat, 1 Dec 2007 09:15:45 GMT (36kb)
Title: Dark-State Polaritons for multi-component and stationary light fields
Authors: F. E. Zimmer, J. Otterbach, R. G. Unanyan, B. W. Shore, and M.
Fleischhauer
Categories: quant-ph
Comments: 5 pages, 2 figures
\\
We present a general scheme to determine the loss-free adiabatic
eigensolutions (dark-state polaritons) of the interaction of multiple probe
laser beams with a coherently driven atomic ensemble under conditions of
electromagnetically induced transparency. To this end we generalize the
Morris-Shore transformation to linearized Heisenberg-Langevin equations
describing the coupled light-matter system in the low excitation limit. In
particular a closed-loop double-V scheme is considered where two
counter-propagating control fields generate a quasi stationary pattern of two
counter-propagating probe fields, so-called stationary light. It is shown that
contrary to previous predictions there exists a single unique dark-state
polariton that obeys a simple propagation equation. In the case of a simple
lambda-type coupling scheme the generalized Morris-Shore transformation
reproduces the dark-state polariton solutions of slow light.
\\ ( http://arxiv.org/abs/0712.0060 , 36kb)
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arXiv:0712.0256
Date: Mon, 3 Dec 2007 10:47:27 GMT (155kb)
Title: Hamiltonian Design in Atom-Light Interactions with Rubidium Ensembles: A
Quantum Information Toolbox
Authors: S. R. de Echaniz, M. Koschorreck, M. Napolitano, M. Kubasik and M. W.
Mitchell
Categories: quant-ph
Comments: 6 pages, 4 figures
\\
We study the coupling between collective variables of atomic spin and light
polarization in an ensemble of cold 87Rb probed with polarized light. The
effects of multiple hyperfine levels manifest themselves as a rank-2 tensor
polarizability, whose irreducible components can be selected by means of probe
detuning. The D1 and D2 lines of Rb are explored and we identify different
detunings which lead to Hamiltonians with different symmetries for rotations.
As possible applications of these Hamiltonians, we describe schemes for spin
squeezing, quantum cloning, quantum memory, and measuring atom number.
\\ ( http://arxiv.org/abs/0712.0256 , 155kb)
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arXiv:0712.0428
Date: Tue, 4 Dec 2007 03:55:29 GMT (222kb)
Title: Experimentally accessible reentrant phase transitions in double-well
optical lattices
Authors: Ippei Danshita, Carlos A. R. Sa de Melo, Charles W. Clark
Categories: cond-mat.other
Comments: 4 pages, 5 figures
\\
We study the quantum phases of bosons confined in a combined potential of a
one-dimensional double-well optical lattice and a parabolic trap. We apply the
time-evolving block decimation method to the corresponding two-legged
Bose-Hubbard model. In the absence of a parabolic trap, the system of bosons in
the double-well optical lattice exhibits a reentrant quantum phase transition
between Mott insulator and superfluid phases at unit filling as the tilt of the
double-wells is increased. We show that the reentrant phase transition occurs
also in the presence of a parabolic trap and suggest that it can be detected in
experiments by measuring the matter-wave interference pattern.
\\ ( http://arxiv.org/abs/0712.0428 , 222kb)
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arXiv:0712.0431
Date: Tue, 4 Dec 2007 04:08:02 GMT (301kb)
Title: Spontaneous rotation in one-dimensional cold atoms
Authors: Akiyuki Tokuno, Masahiro Sato
Categories: cond-mat.other cond-mat.str-el
Comments: 5 pages, 3 figures
\\
We theoretically study harmonically-trapped one-dimensional Bose gases (e.g.,
${}7{\rm Li}$, ${}^{23}{\rm Na}$, ${}^{39}{\rm K}$, ${}^{87}{\rm Rb}$, etc.)
with multi bands occupied, focusing on effects of higher-energy bands.
Combining the Ginzburg-Landau theory with the bosonization techniques, we
predict that the repulsive interaction between higher-band bosons and the
quantum fluctuation can induce the ground state with a finite angular momentum
around the trapped axis. In this state, the $Z_2$ reflection symmetry is
spontaneously broken.
\\ ( http://arxiv.org/abs/0712.0431 , 301kb)
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arXiv:0712.0557
Date: Tue, 4 Dec 2007 15:52:04 GMT (41kb)
Title: Kinetics of phase separation transition in cold-atom boson-fermion
mixtures
Authors: Dmitry Solenov and Dmitry Mozyrsky
Categories: cond-mat.mes-hall
Comments: 4 pages 1 figure
\\
We study the kinetics of the first order phase separation transition in
boson-fermion cold atom mixtures. At sufficiently low temperatures such a
transition is driven by quantum fluctuations responsible for the formation of
critical nuclei of a stable phase. Based on a microscopic description of
interacting boson-fermion mixtures we derive an effective action for the
critical droplet and obtain an asymptotic expression for the nucleation rate in
the vicinity of the phase transition and near the spinodal instability of the
mixed phase. We also discuss effects of dissipation which play a dominant role
close to the transition point, and identify the regimes where quantum
nucleation can be experimentally observed in cold atom systems.
\\ ( http://arxiv.org/abs/0712.0557 , 41kb)
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arXiv:0710.3768 (*cross-listing*)
Date: Fri, 19 Oct 2007 19:56:34 GMT (382kb)
Date (revised v2): Tue, 4 Dec 2007 17:16:12 GMT (410kb)
Title: Atom Interferometry tests of the isotropy of post-Newtonian gravity
Authors: Holger Mueller, Sheng-wey Chiow, Sven Herrmann, Steven Chu, and
Keng-Yeow Chung
Categories: gr-qc physics.atom-ph
Comments: Added outlook, corrected typos; to appear in PRL. 4 pages, 3 figures
\\
We present a test of the local Lorentz invariance of post-Newtonian gravity
by monitoring Earth's gravity with a Mach-Zehnder atom interferometer that
features a resolution of about 8*10^(-9)g/Hz^(1/2), the highest reported thus
far. Expressed within the standard model extension (SME) or Nordtvedt's
anisotropic universe model, the analysis limits four coefficients describing
anisotropic gravity at the ppb level and three others, for the first time, at
the 10ppm level. Using the SME we explicitly demonstrate how the experiment
actually compares the isotropy of gravity and electromagnetism.
\\ ( http://arxiv.org/abs/0710.3768 , 410kb)
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arXiv:0712.0717
Date: Wed, 5 Dec 2007 13:51:47 GMT (124kb)
Title: All-optical production of 7Li Bose-Einstein condensation using Feshbach
resonances
Authors: Noam Gross and Lev Khaykovich
Categories: physics.atom-ph
Comments: 5 pages, 5 figures
\\
We show an all-optical method of making 7Li condensate using tunability of
the scattering length in the proximity of a Feshbach resonance. We report the
observation of two new Feshbach resonances on |F = 1;mF = 0> state. The narrow
(broad) resonance of 7 G (34 G) width is detected at 831 +- 4 G (884 +4 -13 G).
Position of the scattering length zero crossing between the resonances is found
at 836 +- 4 G. The broad resonance is shown to be favorable for run away
evaporation which we perform in a crossed-beam optical dipole trap. Starting
directly form the phase space density of a magneto-optical trap we observe a
Bose-Einstein condensation threshold in less than 3 s of forced evaporation.
\\ ( http://arxiv.org/abs/0712.0717 , 124kb)
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arXiv:0712.0794
Date: Wed, 5 Dec 2007 18:14:52 GMT (807kb,D)
Title: A high-accuracy algorithm for designing arbitrary holographic atom traps
Authors: M. Pasienski and B. DeMarco
Categories: physics.atom-ph
Comments: version with high-resolution figures available at
http://research.physics.uiuc.edu/DeMarco/
\\
We report the realization of a new iterative Fourier-transform algorithm for
creating holograms that can diffract light into an arbitrary two-dimensional
intensity profile. We show that the predicted intensity distributions are
smooth with a fractional error from the target distribution at the percent
level. We demonstrate that this new algorithm outperforms the most frequently
used alternatives typically by one and two orders of magnitude in accuracy and
roughness, respectively. The techniques described in this paper outline a path
to creating arbitrary holographic atom traps in which the only remaining hurdle
is physical implementation.
\\ ( http://arxiv.org/abs/0712.0794 , 807kb)
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arXiv:0712.0867
Date: Thu, 6 Dec 2007 05:36:27 GMT (28kb)
Title: On Non-Relativistic Conformal Field Theory and Trapped Atoms: Virial
Theorems and the State-Operator Correspondence in Three Dimensions
Authors: Thomas Mehen (Duke U.)
Categories: cond-mat.other
Comments: 23 pages, 3 .ps figures
\\
The field theory of nonrelativistic fermions interacting via contact
interactions can be used to calculate the properties of few-body systems of
cold atoms confined in harmonic traps. The state-operator correspondence of
Non-Relativistic Conformal Field Theory (NRCFT) shows that the energy
eigenvalues (in oscillator units) of N harmonically trapped fermions can be
calculated from the scaling dimensions of N-fermion operators in the NRCFT.
They are also in one-to-one correspondence with zero-energy, scale-invariant
solutions to the N-body problem in free space. We show that these two mappings
of the trapped fermion problem to free space problems are related by an
automorphism of the SL(2,R) algebra of the conformal symmetry of fermions at
the unitary limit. This automorphism exchanges the internal Hamiltonian of the
gas with the trapping potential and hence provides a novel method for deriving
virial theorems for trapped Fermi gases at the unitary limit. We also show that
the state-operator correspondence can be applied directly in three spatial
dimensions by calculating the scaling dimensions of two- and three-fermion
operators and finding agreement with known exact results for energy levels of
two and three trapped fermions at the unitary limit.
\\ ( http://arxiv.org/abs/0712.0867 , 28kb)
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arXiv:0712.0880
Date: Thu, 6 Dec 2007 06:35:00 GMT (6kb)
Title: New Density Wave Insulating Phase of BEC in Optical Lattice
Authors: Manan Vyas, Priyam Das, and Prasanta K. Panigrahi
Categories: cond-mat.other
Comments: 3 pages
\\
A new density wave phase of Bose-Einstein condensate (BEC) is identified in
optical lattice, in the mean field approach. A dynamical phase transition is
found to take the BEC from superfluid to a known insulator phase at a certain
filling fraction, which separates another density wave type ground state from
the superfluid state. The latter two are connected by an irreversible phase
transition, however the superfluid and the density wave phases are mutually
exclusive. In contrast to the first one, which has a mono frequency character,
this new state necessarily possesses two frequency modulations over the
background, which are commensurate with the lattice.
\\ ( http://arxiv.org/abs/0712.0880 , 6kb)
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arXiv:0712.0951
Date: Thu, 6 Dec 2007 14:57:36 GMT (219kb)
Title: Tunneling of interacting fermions in 1D systems
Authors: Andrej Gendiar, Martin Mosko, Pavel Vagner and Radoslav Nemeth
Categories: cond-mat.mes-hall
Comments: Conference proceedings
Journal-ref: Acta Physica Polonica 108 (2005) 661-667
\\
Using the self-consistent Hartree-Fock approximation for spinless electrons
at zero temperature, we study tunneling of the interacting electron gas through
a single delta-barrier in a finite one-dimensional (1D) wire connected to
contacts. Our results exhibit features known from correlated many-body models.
In particular, the conductance decays with the wire length as $\propto
L^{-2\alpha}$, where the power $\alpha$ is universal. We also show that a
similar result for a wire conductance can be extracted from the persistent
current (I) through the delta-barrier in a 1D ring, where it is known that I
\propto L^{-1-\alpha}$.
\\ ( http://arxiv.org/abs/0712.0951 , 219kb)
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arXiv:0712.1002
Date: Thu, 6 Dec 2007 17:30:27 GMT (801kb)
Title: Phase Transitions in Finite Systems using Information Theory
Authors: P. Chomaz (GANIL), F. Gulminelli (LPCC)
Categories: cond-mat.stat-mech
Comments: To be published in AIP Conference Proceedings
Proxy: ccsd in2p3-00194045
Report-no: GANIL P 07 23
Journal-ref: Dans AIP Conference Proceedings - Dynamics and Thermodynamics of
Systems with Long Range Interactions: Theory and Experiments, Assisi (2007)
\\
(abridged) In this paper, we present the issues we consider as essential as
far as the statistical mechanics of finite systems is concerned. In particular,
we emphasis our present understanding of phase transitions in the framework of
information theory. Information theory provides a thermodynamically-consistent
treatment of finite, open, transient and expanding systems which are difficult
problems in approaches using standard statistical ensembles. As an example, we
analyze is the problem of boundary conditions, which in the framework of
information theory must also be treated statistically. We recall that out of
the thermodynamical limit the different ensembles are not equivalent and in
particular they may lead to dramatically different equation of states, in the
region of a first order phase transition. We recall the recent progresses
achieved in the understanding of first-order phase transition in finite
systems: the equivalence between the Yang-Lee theorem and the occurrence of
bimodalities in the intensive ensemble and the presence of inverted curvatures
of the thermodynamic potential of the associated extensive ensemble.
\\ ( http://arxiv.org/abs/0712.1002 , 801kb)
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arXiv:0712.1007
Date: Thu, 6 Dec 2007 17:38:40 GMT (57kb,D)
Title: Final-state effects in the radio frequency spectrum of strongly
interacting fermions
Authors: Sourish Basu, Erich J. Mueller
Categories: cond-mat.str-el cond-mat.other
Comments: 4 pages, 2 figures
\\
We model the impact of final state interactions on the radio frequency
spectrum of a strongly interacting two-component superfluid Fermi gas. In
addition to a broad asymmetric peak coming from the break-up of Cooper pairs we
find that, for appropriate parameters, one can observe a sharp symmetric
"bound-bound" spectral line coming from the conversion of Cooper pairs in one
channels to pairs/molecules in another.
\\ ( http://arxiv.org/abs/0712.1007 , 57kb)
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arXiv:0712.0841
Date: Wed, 5 Dec 2007 22:29:01 GMT (869kb,D)
Title: Numerical Simulation of the Double Slit Interference with Ultracold
Atoms
Authors: Michel Gondran, Alexandre Gondran
Categories: quant-ph
Comments: 25 pages, 15 figures
Journal-ref: Am. J. Phys. 73, 2005
\\
We present a numerical simulation of the double slit interference experiment
realized by F. Shimizu, K. Shimizu and H. Takuma with ultracold atoms. We show
how the Feynman path integral method enables the calculation of the
time-dependent wave function. Because the evolution of the probability density
of the wave packet just after it exits the slits raises the issue of the
interpreting the wave/particle dualism, we also simulate trajectories in the de
Broglie-Bohm interpretation.
\\ ( http://arxiv.org/abs/0712.0841 , 869kb)
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\\
arXiv:0712.0990
Date: Thu, 6 Dec 2007 16:49:21 GMT (7kb,D)
Title: Off-Diagonal-Long-Range-Order Versus Entanglement
Authors: Dagomir Kaszlikowski and Marcin Wiesniak
Categories: quant-ph
Comments: 4 pages
\\
In this short note we discuss the relation between the so-called
Off-Diagonal-Long-Range-Order in many-body interacting quantum systems
introduced by C. N. Yang in Rev. Mod. Phys. {\bf 34}, 694 (1962) and
entanglement. We argue that there is a direct relation between these two
concepts.
\\ ( http://arxiv.org/abs/0712.0990 , 7kb)
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The replacements:
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\\
arXiv:0706.2133
replaced with revised version Fri, 30 Nov 2007 11:36:34 GMT (78kb)
Title: Boson-Fermion pairing in Bose-Fermi mixtures on 1D optical lattices
Authors: X. Barillier-Pertuisel, S. Pittel, L.Pollet, P. Schuck
Categories: cond-mat.other nucl-th
Comments: accepted for publication by Phys. Rev. A
\\ ( http://arxiv.org/abs/0706.2133 , 78kb)
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\\
arXiv:0709.0012
replaced with revised version Fri, 30 Nov 2007 16:09:57 GMT (245kb)
Title: Observation of persistent flow of a Bose-Einstein condensate in a
toroidal trap
Authors: C. Ryu, M. F. Andersen, P. Clade, Vasant Natarajan, K. Helmerson, W.
D. Phillips
Categories: cond-mat.other cond-mat.supr-con
Comments: 1 file, 5 figures
\\ ( http://arxiv.org/abs/0709.0012 , 245kb)
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\\
arXiv:0711.2141
replaced with revised version Mon, 3 Dec 2007 16:13:25 GMT (41kb)
Title: Macroscopic Periodic Tunneling of Fermi Atoms in the BCS-BEC Crossover
Authors: L. Salasnich, N. Manini and F. Toigo
Categories: cond-mat.stat-mech cond-mat.soft cond-mat.supr-con
Comments: 4 pages 3 figures revtex
\\ ( http://arxiv.org/abs/0711.2141 , 41kb)
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\\
arXiv:0706.1821
replaced with revised version Sat, 1 Dec 2007 15:12:50 GMT (387kb)
Title: Holographic storage of multiple coherence gratings in a Bose-Einstein
condensate
Authors: Yutaka Yoshikawa, Kazuyuki Nakayama, Yoshio Torii, and Takahiro Kuga
Categories: physics.atom-ph
Comments: 5 pages, 4 figures
Journal-ref: Phys. Rev. Lett. 99, 220407 (2007)
\\ ( http://arxiv.org/abs/0706.1821 , 387kb)
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\\
arXiv:0705.3768
replaced with revised version Tue, 4 Dec 2007 09:18:08 GMT (98kb)
Title: Bose-Einstein-condensed gases in arbitrarily strong random potentials
Authors: V.I.Yukalov, E.P.Yukalova, K.V.Krutitsky, R.Graham
Categories: cond-mat.dis-nn
Journal-ref: Phys. Rev. A 76, 053623 (2007)
DOI: 10.1103/PhysRevA.76.053623
\\ ( http://arxiv.org/abs/0705.3768 , 98kb)
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\\
arXiv:0707.3140 (*cross-listing*)
replaced with revised version Wed, 5 Dec 2007 13:33:24 GMT (54kb)
Title: Interaction-controlled transport of an ultracold Fermi gas
Authors: Niels Strohmaier, Yosuke Takasu, Kenneth G\"unter, Robert J\"ordens,
Michael K\"ohl, Henning Moritz and Tilman Esslinger
Categories: cond-mat.str-el quant-ph
Comments: 4 pages, 4 Postscript figures
Journal-ref: Phys. Rev. Lett. 99, 220601 (2007)
DOI: 10.1103/PhysRevLett.99.220601
\\ ( http://arxiv.org/abs/0707.3140 , 54kb)
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\\
arXiv:0710.1549
replaced with revised version Thu, 6 Dec 2007 13:01:17 GMT (49kb)
Title: Phase separation in a polarized Fermi gas at zero temperature
Authors: S. Pilati and S. Giorgini
Categories: cond-mat.other
Comments: 4 pages, 4 figures, revised, accepted for publication in Phys. Rev.
Lett
\\ ( http://arxiv.org/abs/0710.1549 , 49kb)
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\\
arXiv:0707.1653
replaced with revised version Thu, 6 Dec 2007 17:28:59 GMT (100kb)
Title: Chaos in kicked Bose-Einstein condensates: Bogoliubov resonances
Authors: J. Reslen, C.E. Creffield, and T.S. Monteiro
Categories: quant-ph
Comments: 5 pages
\\ ( http://arxiv.org/abs/0707.1653 , 100kb)
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\\
arXiv:0704.2627
replaced with revised version Thu, 6 Dec 2007 04:46:47 GMT (224kb)
Title: Atom-wave diffraction between the Raman-Nath and the Bragg regime:
Effective Rabi frequency, losses, and phase shifts
Authors: Holger Mueller, Sheng-wey Chiow, and Steven Chu
Categories: physics.atom-ph
Comments: Minor additions, more concise text. To appear in Phys. Rev. A. 20
pages, 10 figures
\\ ( http://arxiv.org/abs/0704.2627 , 224kb)
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Till next time,
Matt.
-- ========================================================================= Dr M. J. Davis, Senior Lecturer in Physics School of Physical Sciences, email: mdavis_at_physics.uq.edu.au University of Queensland, ph : +61 7 334 69824 Brisbane, QLD 4072, fax : +61 7 336 51242 Australia. http://www.physics.uq.edu.au/people/mdavis/ ========================================================================= Matt's arXiv selection: weekly summary of cold-atom papers from arXiv.org http://www.physics.uq.edu.au/people/mdavis/matts_arXiv/ ========================================================================= Legal stuff: Unless stated otherwise, this e-mail represents only the views of the sender and not the views of the University of Queensland =========================================================================Received on Fri Dec 21 2007 - 07:56:10 EST
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