Dear subscribers,
This week's selection was compiled by Geoff Lee, and contains 39 new
abstracts and 13 replacements.
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arXiv:1009.2017
Date: Fri, 10 Sep 2010 14:04:40 GMT (488kb,D)
Title: Tackling the blackbody shift in a strontium optical lattice clock
Authors: Thomas Middelmann, Christian Lisdat, Stephan Falke, Joseph S.R.
Vellore Winfred, Fritz Riehle, Uwe Sterr
Categories: physics.atom-ph quant-ph
Comments: 7 pages, 8 figures
\\
A major obstacle for optical clocks is the frequency shift due to black body
radiation. We discuss how one can tackle this problem in an optical lattice
clock; in our case 87-Sr: firstly, by a measurement of the dc Stark shift of
the clock transition and, secondly, by interrogating the atoms in a cryogenic
environment. Both approaches rely on transporting ultracold atoms over several
cm within a probe cycle. We evaluate this approach of mechanically moving the
optical lattice and conclude that it is feasible to transport the atoms over 50
mm within 300 ms. With this transport a dc Stark shift measurement will allow
to reduce the contribution of the blackbody radiation to the fractional
uncertainty below 2 × 10^−17 at room temperature by improving the shift
coefficient known only from atomic structure calculations up to now. We propose
a cryogenic environment at 77 K that will reduce this contribution to few parts
in 10^−18.
\\ ( http://arxiv.org/abs/1009.2017 , 488kb)
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arXiv:1009.2036 (*cross-listing*)
Date: Fri, 10 Sep 2010 15:40:26 GMT (505kb,D)
Title: Statistically induced Phase Transitions: Turning Bosons smoothly via
Anyons into Fermions
Authors: Tassilo Keilmann, Simon Lanzmich, Ian McCulloch, Marco Roncaglia
Categories: cond-mat.quant-gas cond-mat.other physics.atom-ph quant-ph
\\
Anyons - particles carrying fractional statistics that interpolate between
bosons and fermions - have been conjectured to exist in low dimensional
systems. In the context of the fractional quantum Hall effect (FQHE),
quasi-particles made of electrons take the role of anyons whose statistical
exchange phase is fixed by the filling factor. Here we propose an experimental
setup to create anyons in one-dimensional lattices with fully tuneable exchange
statistics. In our setup, anyons are created by bosons with
occupation-dependent hopping amplitudes, which can be realized by
laser-assisted Raman tunneling. The statistical angle can thus be controlled in
situ by modifying the relative phase of two Raman laser beams. This opens the
fascinating possibility of smoothly transmuting bosons via anyons into fermions
and of inducing a phase transition by the mere control of the particle
statistics as a free parameter. In particular, we demonstrate how to induce a
quantum phase transition from a superfluid into an exotic Mott-like state where
the particle distribution exhibits plateaus at fractional densities.
\\ ( http://arxiv.org/abs/1009.2036 , 505kb)
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arXiv:1009.2075
Date: Fri, 10 Sep 2010 19:05:06 GMT (319kb)
Title: Hyperfine, rotational, and vibrational structure of the triplet ground
state of Rb molecules
Authors: Christoph Strauss, Tetsu Takekoshi, Florian Lang, Klaus Winkler,
Rudolf Grimm, and Johannes Hecker Denschlag
Categories: physics.atom-ph cond-mat.other
\\
We have performed high-resolution two-photon dark-state spectroscopy of an
ultracold gas of Rb molecules in the triplet ground state at a magnetic field
of about 1000 G. The vibrational ladder as well as the hyperfine and low-lying
rotational structure is mapped out. Energy shifts in the spectrum are observed
due to singlet-triplet mixing at binding energies as deep as a few hundred GHz
x h. This information together with data from other sources is used to optimize
the potentials of the triplet and singlet states in a coupled-channel model. We
find that the hyperfine structure depends weakly on the vibrational level. This
provides a possible explanation for inaccuracies in recent Feshbach resonance
calculations.
\\ ( http://arxiv.org/abs/1009.2075 , 319kb)
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arXiv:1009.2122
Date: Sat, 11 Sep 2010 00:13:54 GMT (1034kb)
Title: Effect of scattering lengths on the dynamics of a two-component
Bose-Einstein condensate
Authors: G\'abor Csire. D\'aniel Schumayer and Barnab\'as Apagyi
Categories: cond-mat.quant-gas nlin.PS
Comments: 21 pages, 10 figures
\\
We examine the effect of the intra- and interspecies scattering lengths on
the dynamics of a two-component Bose-Einstein condensate, particularly focusing
on the existence and stability of solitonic excitations. For each type of
possible soliton pairs stability ranges are presented in tabulated form. We
also compare the numerically established stability of bright-bright,
bright-dark and dark-dark solitons with our analytical prediction and with that
of Painlev\'e-analysis of the dynamical equation. We demonstrate that tuning
the inter-species scattering length away from the predicted value (keeping the
intra-species coupling fixed) breaks the stability of the soliton pairs.
\\ ( http://arxiv.org/abs/1009.2122 , 1034kb)
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arXiv:1009.2125
Date: Sat, 11 Sep 2010 00:51:21 GMT (995kb)
Title: Dynamical system approach to the BCS-BEC crossover in a gas of ultracold
Fermions
Authors: Analabha Roy
Categories: cond-mat.quant-gas
Comments: 23 pages, 6 figures. Submitted to Physical Review A
\\
The problem of the BCS-BEC crossover in a superfluid ultracold Fermi-gas near
a narrow Feshbach resonance is approached through the time-dependent and
complex Ginzburg-Landau (TDGL) theory. The dynamical system is constructed
using Ginzburg-Landau-Abrikosov-Gor'kov (GLAG) path integral methods with the
single mode approximation for the composite Bosons, and the onset of crossover
is demonstrated for adiabatic variations of the Feshbach detuning along the
fixed points of the dynamical system. Investigations into the rich superfluid
dynamics of this system in the immediate neighborhood of the crossover yields
the onset of multiple interference patterns in the dynamics as the system is
quenched from a pure BEC to the crossover regime. This results in a partial
collapse and revival of the coherent matter wave field of the BEC, whose
temporal profile is reported.
\\ ( http://arxiv.org/abs/1009.2125 , 995kb)
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arXiv:1009.2133
Date: Sat, 11 Sep 2010 03:01:57 GMT (814kb)
Title: Quantum anomalous Hall states in the $p$-orbital honeycomb optical
lattices
Authors: Machi Zhang, Hsiang-hsuan Hung, Chuanwei Zhang, Congjun Wu
Categories: cond-mat.quant-gas
Comments: 13 pages, 11 figures
\\
We study the quantum anomalous Hall states in the $p$-orbital bands of the
honeycomb optical lattices loaded with the single component fermions. By
applying the available experiment technique developed by Gemelke et al. to
rotate each lattice site around its own center, the band structures become
topologically non-trivial. At a certain rotation angular velocity $\Omega$, a
flat band structure appears whose localized eigenstates are constructed as
plaquette current moment states. With imposing the soft harmonic confining
potential, the density profile exhibits a wedding-cake shaped distribution with
insulating plateaus at commensurate fillings. Moreover, the inhomogeneous
confining potential induces dissipationless circulation currents whose
magnitudes and chiralities vary with the distance from the center of the trap.
\\ ( http://arxiv.org/abs/1009.2133 , 814kb)
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arXiv:1009.2283
Date: Mon, 13 Sep 2010 01:37:11 GMT (153kb)
Title: Analytical thermodynamics of a strongly attractive three-component Fermi
gas in one dimension
Authors: Peng He, Xiangguo Yin, Xiwen Guan, Murray T. Batchelor and Yupeng Wang
Categories: cond-mat.quant-gas cond-mat.stat-mech
Comments: 14 pages, 7 figures
\\
Ultracold three-component atomic Fermi gases in one dimension are expected to
exhibit rich physics due to the presence of trions and different pairing
states. Quantum phase transitions from the trion state into a paired phase and
a normal Fermi liquid occur at zero temperature. We derive the analytical
thermodynamics of strongly attractive three-component one-dimensional fermions
with SU(3) symmetry via the thermodynamic Bethe ansatz method in unequal Zeeman
splitting fields $H_1$ and $H_2$. We find explicitly that for low temperature
the system acts like either a two-component or a three-component
Tomonaga-Luttinger liquid dependent on the system parameters. The phase
diagrams for the chemical potential and specific heat are presented for
illustrative values of the Zeeman splitting. We also demonstrate that crossover
between different Tomonaga-Luttinger liquid phases evolve singular behaviour in
specific heat and entropy as the temperature tends to zero. Beyond
Tomonaga-Luttinger liquid physics, we obtain the equation of state which
provides a precise description of universal thermodynamics and quantum
criticality in three-component strongly attractive Fermi gases.
\\ ( http://arxiv.org/abs/1009.2283 , 153kb)
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arXiv:1009.2293
Date: Mon, 13 Sep 2010 03:54:00 GMT (344kb)
Title: Superconductivity as the effect of Bose-Einstein condensation and the
relationship of superconductor critical temperature and its electronic
specific heat
Authors: B.V.Vasiliev
Categories: cond-mat.supr-con
\\
It is shown that the temperature dependence of the value of energy gap in
superconductors is characteristic for the order-disorder transition. The
obtained relationship between the critical temperature and the critical
magnetic field of the Bose-Einstein condensate of electrically charged
particles is in accordance with measurement data of superconductors. On this
base the relation of the critical temperature of the superconductor and its
Sommerfeld constant is obtained, i.e. is found the dependence for critical
temperature and the Fermi energy of I-type superconductors. The estimation of
properties of II-type superconductors reveals a somewhat different relation of
critical temperature and Fermi energy. Among the high-temperature
superconducting ceramics there are the both - I and II - types superconductors.
\\ ( http://arxiv.org/abs/1009.2293 , 344kb)
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arXiv:1009.2372
Date: Mon, 13 Sep 2010 12:55:53 GMT (435kb)
Title: Helical spin textures in dipolar Bose-Einstein condensates
Authors: J. A. M. Huhtam\"aki and P. Kuopanportti
Categories: cond-mat.quant-gas
Comments: 7 pages, 6 figures
\\
We numerically study elongated helical spin textures in ferromagnetic spin-1
Bose-Einstein condensates subject to dipolar interparticle forces. Stationary
states of the zero-temperature mean-field Gross-Pitaevskii equation are solved
and analyzed for various values of the helical wave vector and dipolar coupling
strength. We find two helical spin textures which differ by the nature of their
topological defects. The spin structure hosting a pair of Mermin-Ho vortices
with opposite mass flows and aligned spin currents is stabilized for a nonzero
value of the helical wave vector.
\\ ( http://arxiv.org/abs/1009.2372 , 435kb)
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arXiv:1009.2374
Date: Mon, 13 Sep 2010 12:56:13 GMT (3321kb,D)
Title: Nonlinear atom interferometer surpasses classical precision limit
Authors: Christian Gross, Tilman Zibold, Eike Nicklas, Jerome Esteve and Markus
K. Oberthaler
Categories: cond-mat.quant-gas
Journal-ref: Nature 464, 1165 (2010)
DOI: 10.1038/nature08919
\\
Interference is fundamental to wave dynamics and quantum mechanics. The
quantum wave properties of particles are exploited in metrology using atom
interferometers, allowing for high-precision inertia measurements [1, 2].
Furthermore, the state-of-the-art time standard is based on an interferometric
technique known as Ramsey spectroscopy. However, the precision of an
interferometer is limited by classical statistics owing to the finite number of
atoms used to deduce the quantity of interest [3]. Here we show experimentally
that the classical precision limit can be surpassed using nonlinear atom
interferometry with a Bose-Einstein condensate. Controlled interactions between
the atoms lead to non-classical entangled states within the interferometer;
this represents an alternative approach to the use of non-classical input
states [4-8]. Extending quantum interferometry [9] to the regime of large atom
number, we find that phase sensitivity is enhanced by 15 per cent relative to
that in an ideal classical measurement. Our nonlinear atomic beam splitter
follows the "one-axis-twisting" scheme [10] and implements interaction control
using a narrow Feshbach resonance. We perform noise tomography of the quantum
state within the interferometer and detect coherent spin squeezing with a
squeezing factor of -8.2dB [11-15]. The results provide information on the
many-particle quantum state, and imply the entanglement of 170 atoms [16].
\\ ( http://arxiv.org/abs/1009.2374 , 3321kb)
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arXiv:1009.2404
Date: Mon, 13 Sep 2010 14:24:32 GMT (63kb,D)
Title: Quantum mechanics needs no consciousness (and the other way around)
Authors: Shan Yu and Danko Nikoli\'c
Categories: physics.gen-ph physics.pop-ph
Comments: 7 pages, 1 figure
\\
It has been suggested that consciousness plays an important role in quantum
mechanics as it is necessary for the collapse of wave function during the
measurement. Furthermore, this idea has spawned a symmetrical proposal: a
possibility that quantum mechanics explains the emergence of consciousness in
the brain. Here we formulated several predictions that follow from this
hypothetical relationship and that can be empirically tested. Some of the
experimental results that are already available suggest falsification of the
first hypothesis. Thus, the suggested link between human consciousness and
collapse of wave function does not seem viable. We discuss the constraints
implied by the existing evidence on the role that the human observer may play
for quantum mechanics and the role that quantum mechanics may play in the
observer's consciousness.
\\ ( http://arxiv.org/abs/1009.2404 , 63kb)
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arXiv:1009.2415
Date: Mon, 13 Sep 2010 15:08:07 GMT (1117kb,D)
Title: Controlling and Detecting Spin Correlations of Ultracold Atoms in
Optical lattices
Authors: Stefan Trotzky, Yu-Ao Chen, Ute Schnorrberger, Patrick Cheinet and
Immanuel Bloch
Categories: cond-mat.quant-gas
Comments: 6 pages, 4 figures
\\
We report on the controlled creation of a valence bond state of delocalized
effective-spin singlet and triplet dimers by means of a bichromatic optical
superlattice. We demonstrate a coherent coupling between the singlet and
triplet states and show how the superlattice can be employed to measure the
singlet-fraction employing a spin blockade effect. Our method provides a
reliable way to detect and control nearest-neighbor spin correlations in
many-body systems of ultracold atoms. Being able to measure these correlations
is an important ingredient to study quantum magnetism in optical lattices. We
furthermore employ a SWAP operation between atoms being part of different
triplets, thus effectively increasing their bond-length. Such SWAP operation
provides an important step towards the massively parallel creation of a
multi-particle entangled state in the lattice.
\\ ( http://arxiv.org/abs/1009.2415 , 1117kb)
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arXiv:1009.2441
Date: Mon, 13 Sep 2010 16:24:52 GMT (754kb,D)
Title: Enhancement of laser cooling by the use of magnetic gradients
Authors: Andreas Albrecht, Alex Retzker, Christof Wunderlich, Martin B. Plenio
Categories: quant-ph
Comments: 14 pages, 8 figures
\\
We present a laser cooling scheme for trapped ions and atoms using a
combination of laser couplings and a magnetic gradient field. In a
Schrieffer-Wolff transformed picture, this setup cancels the carrier and blue
sideband terms completely resulting in an improved cooling behaviour compared
to standard cooling schemes (e.g. sideband cooling) and allowing cooling to the
vibrational ground state. A condition for optimal cooling rates is presented
and the cooling behaviour for different Lamb-Dicke parameters and spontaneous
decay rates is discussed. Cooling rates of one order of magnitude less than the
trapping frequency are achieved using the new cooling method. Furthermore the
scheme turns out to be robust under deviations from the optimal parameters and
moreover provides good cooling rates also in the multi particle case.
\\ ( http://arxiv.org/abs/1009.2441 , 754kb)
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arXiv:1009.2475
Date: Mon, 13 Sep 2010 18:56:19 GMT (123kb)
Title: Observation of the pre-superfluid regime in a two-dimensional Bose gas
Authors: S. Tung, G. Lamporesi, D. Lobser, L. Xia, and E. A. Cornell
Categories: cond-mat.quant-gas
Comments: 4 pages, 3 figures. Resubmission version of the letter submitted to
PRL on 7/12/10
\\
In complementary images of coordinate-space and momentum-space density in a
trapped 2D Bose gas, we observe the emergence of pre-superfluid behavior. As
phase-space density $\rho$ increases toward degenerate values, we observe a
gradual divergence of the compressibility $\kappa$ from the value predicted by
a bare-atom model, $\kappa_{ba}$. $\kappa/\kappa_{ba}$ grows to 1.7 before
$\rho$ reaches the value for which we observe the sudden emergence of a spike
at $p=0$ in momentum space. Momentum-space images are acquired by means of a 2D
focusing technique. Our data represent the first observation of non-meanfield
physics in the pre-superfluid but degenerate 2D Bose gas.
\\ ( http://arxiv.org/abs/1009.2475 , 123kb)
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arXiv:1009.2485 (*cross-listing*)
Date: Mon, 13 Sep 2010 19:31:12 GMT (566kb)
Title: Gravitational Redshift, Equivalence Principle, and Matter Waves
Authors: Michael A. Hohensee, Brian Estey, Francisco Monsalve, Geena Kim,
Pei-Chen Kuan, Shau-Yu Lan, Nan Yu, Achim Peters, Steven Chu, and Holger
Mueller
Categories: gr-qc physics.atom-ph quant-ph
Comments: Work in progress. 11 pages
\\
We review matter wave and clock comparison tests of the gravitational
redshift. To elucidate their relationship to tests of the universality of free
fall (UFF), we define scenarios wherein redshift violations are coupled to
violations of UFF ("type II"), or independent of UFF violations ("type III"),
respectively. Clock comparisons and atom interferometers are sensitive to
similar effects in type II and precisely the same effects in type III
scenarios, although type III violations remain poorly constrained. Finally, we
describe the "Geodesic Explorer," a conceptual spaceborne atom interferometer
that will test the gravitational redshift with an accuracy 5 orders of
magnitude better than current terrestrial redshift experiments for type II
scenarios and 12 orders of magnitude better for type III.
\\ ( http://arxiv.org/abs/1009.2485 , 566kb)
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arXiv:1009.2493 (*cross-listing*)
Date: Mon, 13 Sep 2010 19:55:21 GMT (121kb,D)
Title: Absence of thermalization in non-integrable systems
Authors: Christian Gogolin, Markus P. Mueller, and Jens Eisert
Categories: quant-ph cond-mat.stat-mech
Comments: 5 pages, 2 figures
\\
We present results establishing a link between unitary relaxation dynamics
after a quench in closed many-body systems in non-equilibrium and the
entanglement in the energy eigenbasis. We find that even if reduced states
equilibrate, and appear perfectly relaxed, they can still have memory on the
initial conditions even in models that are far from integrable, thereby giving
rise to "equilibration without thermalization". We show that in such situations
the equilibrium states are, however, still described by a Jaynes maximum
entropy or generalized Gibbs ensemble and, moreover, that this is always the
case if equilibration happens, regardless of whether a model is integrable or
not. In addition, we discuss individual aspects of thermalization processes
separately, comment on the role of Anderson localization, and collect and
compare different notions of integrability.
\\ ( http://arxiv.org/abs/1009.2493 , 121kb)
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arXiv:1009.2513
Date: Mon, 13 Sep 2010 20:28:07 GMT (790kb)
Title: Cold N+NH Collisions in a Magnetic Trap
Authors: Matthew T. Hummon and Timur V. Tscherbul and Jacek K{\l}os and Hsin-I
Lu and Edem Tsikata and Wesley C. Campbell and Alexander Dalgarno and John M.
Doyle
Categories: physics.atom-ph
\\
We present an experimental and theoretical study of atom-molecule collisions
in a mixture of cold, trapped atomic nitrogen and NH molecules at a temperature
of $\sim 600$~mK. We measure a small N+NH trap loss rate coefficient of
$k^{(\mathrm{N+NH})}_\mathrm{loss} = 8(4) \times 10^{-13}$~cm$^{3}$s$^{-1}$.
Accurate quantum scattering calculations based on {\it ab initio} interaction
potentials are in agreement with experiment and indicate the magnetic dipole
interaction to be the dominant loss mechanism. Our theory further indicates the
ratio of N+NH elastic to inelastic collisions remains large ($>100$) into the
mK regime.
\\ ( http://arxiv.org/abs/1009.2513 , 790kb)
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arXiv:1009.2544
Date: Tue, 14 Sep 2010 00:27:00 GMT (915kb)
Title: Loading characteristics of a microscopic optical dipole trap
Authors: P. Kulatunga, T. Blum, and D. Olek
Categories: physics.atom-ph
Comments: 8 pages, 9 Figures
\\
We report on an investigation of loading characteristics of deep microscopic
dipole traps. The dipole trap is loaded from a low density magneto optical trap
(MOT) containing $\approx 5\times 10^{6}$ atoms. We determine the loading
parameters that maximize the trapped atom number for a trap of waist 5 {\mu}m
with trap depths ranging from 3.5 mK to 10 mK. We determine the optimal trap
loading conditions and the loading rates, loss coefficients and temperature of
the trapped atoms under these conditions. We show that it is possible to load a
few hundred to thousand atoms in dipole traps of depth 3.5 mK to 8.5 mK under
the optimal loading conditions.
\\ ( http://arxiv.org/abs/1009.2544 , 915kb)
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arXiv:1009.2603
Date: Tue, 14 Sep 2010 09:40:40 GMT (198kb)
Title: An Experimental Proposal to Test Dynamic Quantum Non-locality with
Single-Atom Interferometry
Authors: Shi-Liang Zhu, Zheng-Yuan Xue, Dan-Wei Zhang, and Lu-Ming Duan
Categories: quant-ph
Comments: 4 pages
\\
Quantum non-locality based on the well-known Bell inequality is of kinematic
nature. A different type of quantum non-locality, the non-locality of the
quantum equation of motion, is recently put forward with connection to the
Aharonov-Bohm effect [Nature Phys. 6, 151 (2010)]. Evolution of the
displacement operator provides an example to manifest such dynamic quantum
non-locality. We propose an experiment using single-atom interferometry to test
such dynamic quantum non-locality. We show how to measure evolution of the
displacement operator with clod atoms in a spin-dependent optical lattice
potential and discuss signature to identify dynamic quantum non-locality under
a realistic experimental setting.
\\ ( http://arxiv.org/abs/1009.2603 , 198kb)
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arXiv:1009.2606
Date: Tue, 14 Sep 2010 10:00:13 GMT (63kb)
Title: Magnetic cooling of ultracold two-component fermions using high-spin
Fermi gases
Authors: M. Colom\'e-Tatch\'e, C. Klempt, L. Santos, and T. Vekua
Categories: cond-mat.quant-gas
Comments: 4 pages, 3 eps figures
\\
We propose a cooling scheme for two-component fermions in optical lattices
that employs the internal structure of high-spin Fermi gases. Adiabatically
changing the quadratic Zeeman coupling from a uniform distribution to a space
dependent one allows for the creation of an inner spin-1/2 core surrounded by
spin-S wings. We show that, due to frustration, spin-S regions act via
spin-changing collisions as effective entropy absorbers for the spin-1/2 core
with increasing efficiency at lower temperatures and higher dimensions. We
illustrate our scheme explicitly on 1D spin-3/2 fermions, showing that the
entropy of the spin-1/2 Mott region can be significantly reduced. Our findings
suggest that the proposed method can be highly efficient, opening a feasible
path for accessing anti-ferromagnetic order under current experimental
conditions.
\\ ( http://arxiv.org/abs/1009.2606 , 63kb)
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arXiv:1009.2623 (*cross-listing*)
Date: Tue, 14 Sep 2010 10:56:01 GMT (478kb)
Title: Dephasing effects on stimulated Raman adiabatic passage in tripod
configurations
Authors: C. Lazarou and N. V. Vitanov
Categories: quant-ph physics.atom-ph
Comments: 13 pages; 9 figures; Accepted for publication Physical Review A
\\
We present an analytic description of the effects of dephasing processes on
stimulated Raman adiabatic passage in a tripod quantum system. To this end, we
develop an effective two-level model. Our analysis makes use of the adiabatic
approximation in the weak dephasing regime. An effective master equation for a
two-level system formed by two dark states is derived, where analytic solutions
are obtained by utilizing the Demkov-Kunike model. From these, it is found that
the fidelity for the final coherent superposition state decreases exponentially
for increasing dephasing rates. Depending on the pulse ordering and for
adiabatic evolution the pulse delay can have an inverse effect.
\\ ( http://arxiv.org/abs/1009.2623 , 478kb)
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arXiv:1009.2648
Date: Tue, 14 Sep 2010 13:12:04 GMT (9kb)
Title: Isothermal sweep theorems for ultra-cold quantum gases in a canonical
ensemble
Authors: M. Iskin
Categories: cond-mat.quant-gas
Comments: 5 pages
\\
After deriving the Hellmann-Feynman theorem (HFT) that is suitable for mixed
states in a canonical ensemble, we use this theorem to obtain the isothermal
sweep theorems for the free, average and trapping energies, and for the
entropy, specific heat and pressure of strongly-correlated ultra-cold quantum
gases. We also use the HFT to obtain the Virial theorem in a canonical
ensemble, and discuss its implications for quantum gases.
\\ ( http://arxiv.org/abs/1009.2648 , 9kb)
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arXiv:1009.2655
Date: Tue, 14 Sep 2010 13:24:17 GMT (232kb)
Title: Einstein-Podolsky-Rosen Correlations of Ultracold Atomic Gases
Authors: Nir Bar-Gill, Christian Gross, Gershon Kurizki, Igor Mazets, Markus
Oberthaler
Categories: quant-ph
\\
Einstein, Podolsky & Rosen (EPR) pointed out that correlations induced
between quantum objects will persist after these objects have ceased to
interact. Consequently, their joint continuous variables (CV), e.g., the
difference of their positions and the sum of their momenta, may be specified,
regardless of their distance, with arbitrary precision. EPR correlations give
rise to two fundamental notions: {\em nonlocal ``steering''} of the quantum
state of one object by measuring the other, and inseparability ({\em
entanglement}) of their quantum states. EPR entanglement is a resource of
quantum information (QI) and CV teleportation of light and matter waves. It has
lately been demonstrated for {\em collective} CV of distant thermal-gas clouds,
correlated by interaction with a common field. Here we demonstrate that
collective CV of two species of trapped ultracold bosonic gases can be
EPR-correlated (entangled) via {\em inherent} interactions between the species.
This paves the way to further QI applications of such systems, which are atomic
analogs of coupled superconducting Josephson Junctions (JJ). A precursor of
this study has been the observation of quantum correlations (squeezing) in a
single bosonic JJ.
\\ ( http://arxiv.org/abs/1009.2655 , 232kb)
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arXiv:1009.2700
Date: Tue, 14 Sep 2010 15:43:29 GMT (676kb)
Title: Resonant enhancement of the FFLO-state in 3D by a one-dimensional
optical potential
Authors: Jeroen P. A. Devreese, Sergei N. Klimin and Jacques Tempere
Categories: cond-mat.quant-gas
Comments: 19 pages 6 figures
\\
We describe an imbalanced superfluid Fermi gas in three dimensions within the
path-integral framework. To allow for the formation of the
Fulde-Ferell-Larkin-Ovchinnikov-state (FFLO-state), a suitable form of the
saddle-point is chosen, in which the pairs have a finite centre-of-mass
momentum. To test the correctness of this path-integral description, the
zero-temperature phase diagram for an imbalanced Fermi gas in three dimensions
is calculated, and compared to recent theoretical results. Subsequently, we
investigate two models that describe the effect of imposing a one-dimensional
optical potential on the 3D imbalanced Fermi gas. We show that this 1D optical
potential can greatly enlarge the stability region of the FFLO-state, relative
to the case of the 3D Fermi gas without 1D periodic modulation. Furthermore it
is show that there exists a direct connection between the centre-of-mass
momentum of the FFLO-pairs and the wavevector of the optical potential. We
propose that this concept can be used experimentally to resonantly enhance the
stability region of the FFLO-state.
\\ ( http://arxiv.org/abs/1009.2700 , 676kb)
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arXiv:1009.2702
Date: Tue, 14 Sep 2010 15:47:00 GMT (2609kb)
Title: An Atomic Gravitational Wave Interferometric Sensor in Low Earth Orbit
(AGIS-LEO)
Authors: Jason M. Hogan, David M. S. Johnson, Susannah Dickerson, Tim Kovachy,
Alex Sugarbaker, Sheng-wey Chiow, Peter W. Graham, Mark A. Kasevich, Babak
Saif, Surjeet Rajendran, Philippe Bouyer, Bernard D. Seery, Lee Feinberg,
Ritva Keski-Kuha
Categories: physics.atom-ph gr-qc
Comments: 37 pages, 21 figures
\\
We propose an atom interferometer gravitational wave detector in low Earth
orbit (AGIS-LEO). Gravitational waves can be observed by comparing a pair of
atom interferometers separated over a ~30 km baseline. In the proposed
configuration, one or three of these interferometer pairs are simultaneously
operated through the use of two or three satellites in formation flight. The
three satellite configuration allows for the increased suppression of multiple
noise sources and for the detection of stochastic gravitational wave signals.
The mission will offer a strain sensitivity of < 10^(-18) / Hz^(1/2) in the 50
mHz - 10 Hz frequency range, providing access to a rich scientific region with
substantial discovery potential. This band is not currently addressed with the
LIGO or LISA instruments. We analyze systematic backgrounds that are relevant
to the mission and discuss how they can be mitigated at the required levels.
Some of these effects do not appear to have been considered previously in the
context of atom interferometry, and we therefore expect that our analysis will
be broadly relevant to atom interferometric precision measurements. Finally, we
present a brief conceptual overview of shorter-baseline (< 100 m) atom
interferometer configurations that could be deployed as proof-of-principle
instruments on the International Space Station (AGIS-ISS) or an independent
satellite.
\\ ( http://arxiv.org/abs/1009.2702 , 2609kb)
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\\
arXiv:1009.2713
Date: Tue, 14 Sep 2010 16:36:51 GMT (471kb)
Title: An elementary exposition of the Efimov Effect
Authors: Rajat K. Bhaduri, Arindam Chatterjee and Brandon P. van Zyl
Categories: quant-ph cond-mat.quant-gas
Comments: 4 figures. Accepted for publication in American Journal of Physics
\\
Two particles that are just shy of binding may develop an infinite number of
shallow bound states when a third particle is added. This counter intuitive
quantum mechanical result was first predicted by V.~Efimov for identical bosons
interacting with a short-range pair-wise potential. The so-called Efimov effect
persists even for non-identical particles, provided at least two of the three
bonds are almost bound. The Efimov effect has recently been verified
experimentally using ultra-cold atoms. In this article, we explain the origin
of this effect using only elementary quantum mechanics, and summarize the
experimental evidence for the Efimov effect. A new, simple derivation for the
number of Efimov states is given in the Appendix.
\\ ( http://arxiv.org/abs/1009.2713 , 471kb)
------------------------------------------------------------------------------
\\
arXiv:1009.2748 (*cross-listing*)
Date: Tue, 14 Sep 2010 19:56:08 GMT (1285kb)
Title: Fast conservative and entropic numerical methods for the Boson Boltzmann
equation
Authors: P.A. Markowitch, L. Pareschi
Categories: math.NA cond-mat.mes-hall cond-mat.quant-gas physics.comp-ph
MSC-class: 82C10, 76P05, 65D32, 65T50
Journal-ref: Numerische Mathematik, 99 (2005), 509-532
\\
In this paper we derive accurate numerical methods for the quantum Boltzmann
equation for a gas of interacting bosons. The schemes preserve the main
physical features of the continuous problem, namely conservation of mass and
energy, the entropy inequality and generalized Bose-Einstein distributions as
steady states. These properties are essential in order to develop schemes that
are able to capture the energy concentration behavior of bosons. In addition we
develop fast algorithms for the numerical evaluation of the resulting
quadrature formulas which allow the final schemes to be computed only in O(N^2
log N) operations instead of O(N^3).
\\ ( http://arxiv.org/abs/1009.2748 , 1285kb)
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\\
arXiv:1009.2759
Date: Tue, 14 Sep 2010 20:05:01 GMT (1421kb)
Title: Thermodynamics of the 3D Hubbard model on approach to the Neel
transition
Authors: S. Fuchs, E. Gull, L. Pollet, E. Burovski, E. Kozik, T. Pruschke, M.
Troyer
Categories: cond-mat.quant-gas cond-mat.str-el
Comments: 4 pages, 6 figures
\\
We study the thermodynamic properties of the 3D Hubbard model for
temperatures down to the Neel temperature using cluster dynamical mean-field
theory. In particular we calculate the energy, entropy, density, double
occupancy and nearest-neighbor spin correlations as a function of chemical
potential, temperature and repulsion strength. To make contact with cold-gas
experiments, we also compute properties of the system subject to an external
trap in the local density approximation. We find that an entropy per particle
$S/N \approx 0.65(6)$ at $U/t=8$ is sufficient to achieve a Neel state in the
center of the trap, substantially higher than the entropy required in a
homogeneous system. Precursors to antiferromagnetism can clearly be observed in
nearest-neighbor spin correlators.
\\ ( http://arxiv.org/abs/1009.2759 , 1421kb)
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\\
arXiv:1009.2761
Date: Tue, 14 Sep 2010 20:11:49 GMT (989kb,D)
Title: Thermodynamics of the three-dimensional Hubbard model: Implications for
cooling cold atomic gases in optical lattices
Authors: Lorenzo De Leo, Jean-Sebastien Bernier, Corinna Kollath, Antoine
Georges, Vito W. Scarola
Categories: cond-mat.quant-gas cond-mat.str-el
Comments: 17 pages, 27 figures
\\
We present a comprehensive study of the thermodynamic properties of the
three-dimensional fermionic Hubbard model, with application to cold fermionic
atoms subject to an optical lattice and a trapping potential. Our study is
focused on the temperature range of current experimental interest. We employ
two theoretical methods - dynamical mean-field theory and high-temperature
series - and perform comparative benchmarks to delimitate their respective
range of validity. Special attention is devoted to understand the implications
that thermodynamic properties of this system have on cooling. Considering the
distribution function of local occupancies in the inhomogeneous lattice, we
show that, under adiabatic evolution, the variation of any observable (e.g.,
temperature) can be conveniently disentangled into two distinct contributions.
The first contribution is due to the redistribution of atoms in the trap during
the evolution, while the second one comes from the intrinsic change of the
observable. Finally, we provide a simplified picture of the cooling procedure
recently proposed in J.-S. Bernier et al., Phys. Rev. A 79, 061601 (2009) by
applying this method to an idealized model.
\\ ( http://arxiv.org/abs/1009.2761 , 989kb)
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\\
arXiv:1009.2904 (*cross-listing*)
Date: Wed, 15 Sep 2010 12:11:16 GMT (1427kb)
Title: Superfluid Motion of Light
Authors: Patricio Leboeuf and Simon Moulieras
Categories: cond-mat.quant-gas nlin.PS physics.optics
Comments: 4 pages, 3 figures
\\
Superfluidity, the ability of a fluid to move without dissipation, is one of
the most spectacular manifestations of the quantum nature of matter. We explore
here the possibility of superfluid motion of light. Controlling the speed of a
light packet with respect to a defect, we demonstrate the presence of
superfluidity and, above a critical velocity, its breakdown through the onset
of a dissipative phase. We describe a possible experimental realization based
on the transverse motion through an array of waveguides. These results open new
perspectives in transport optimization.
\\ ( http://arxiv.org/abs/1009.2904 , 1427kb)
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\\
arXiv:1009.2916 (*cross-listing*)
Date: Wed, 15 Sep 2010 13:18:57 GMT (255kb)
Title: Cavity-enhanced atom detection with cooperative noise reduction
Authors: J. Goldwin, M. Trupke, J. Kenner, A. Ratnapala, and E. A. Hinds
Categories: quant-ph physics.atom-ph
Comments: 4 pages, 3 figures, 1 table; submitted for publication
\\
An optical microcavity with small mode radius is used to measure the local
density of a cold atom cloud. Atom densities below 1 per cavity mode volume are
measured with signals near the photon shot-noise limit. Atom detection is fast
and efficient, reaching fidelities in excess of 97% after 10 us and 99.9% after
30 us. Notably, the fluctuations of the detected photon counts are smaller than
expected for Poissonian distributions of atoms probed with Poissonian light
fields. This noise suppression is attributed to multi-atom effects on the
collective atomic dipole interacting with the cavity field. Our measurements
confirm a decade-old theory of atomic beams in cavity quantum electrodynamics.
\\ ( http://arxiv.org/abs/1009.2916 , 255kb)
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\\
arXiv:1009.2956
Date: Wed, 15 Sep 2010 15:41:00 GMT (832kb,D)
Title: Measuring entanglement in condensed matter systems
Authors: M. Cramer, M.B. Plenio, and H. Wunderlich
Categories: quant-ph cond-mat.quant-gas cond-mat.str-el
Comments: 6 pages, 2 figures
\\
We show how entanglement may be quantified in spin and cold atom many-body
systems using standard experimental techniques only. The scheme requires no
assumptions on the state in the laboratory and a lower bound to the
entanglement can be read off directly from the scattering cross section of
Neutrons deflected from solid state samples or the time-of-flight distribution
of cold atoms in optical lattices, respectively. This removes a major obstacle
which so far has prevented the direct and quantitative experimental study of
genuine quantum correlations in many-body systems: The need for a full
characterization of the state to quantify the entanglement contained in it.
Instead, the scheme presented here relies solely on global measurements that
are routinely performed and is versatile enough to accommodate systems and
measurements different from the ones we exemplify in this work.
\\ ( http://arxiv.org/abs/1009.2956 , 832kb)
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\\
arXiv:1009.2962
Date: Wed, 15 Sep 2010 16:15:59 GMT (416kb,D)
Title: Spectroscopy of a narrow-line laser cooling transition in atomic
dysprosium
Authors: Mingwu Lu and Seo Ho Youn and Benjamin L. Lev
Categories: physics.atom-ph quant-ph
Comments: 6+ pages, 5 figures, 5 tables
\\
The laser cooling and trapping of ultracold neutral dysprosium has been
recently demonstrated using the broad, open 421-nm cycling transition.
Narrow-line magneto-optical trapping of Dy on longer wavelength transitions
would enable the preparation of ultracold Dy samples suitable for loading
optical dipole traps and subsequent evaporative cooling. We have identified the
closed 741-nm cycling transition as a candidate for the narrow-line cooling of
Dy. We present experimental data on the isotope shifts, the hyperfine constants
A and B, and the decay rate of the 741-nm transition. In addition, we report a
measurement of the 421-nm transition's linewidth, which agrees with previous
measurements. We summarize the laser cooling characteristics of these
transitions as well as other narrow cycling transitions that may prove useful
for cooling Dy.
\\ ( http://arxiv.org/abs/1009.2962 , 416kb)
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\\
arXiv:1009.3118
Date: Thu, 16 Sep 2010 08:44:20 GMT (74kb)
Title: Optical cooling and trapping of tripod-type atoms with rectified
radiation forces
Authors: I. V. Krasnov
Categories: physics.optics physics.atom-ph quant-ph
Comments: 15 pages, 2 figures
\\
A new scheme of three-dimensional (3D) all-optical (nonmagnetic) cooling and
trapping of resonant atoms, based on using of so-called rectified radiation
forces in non-monochromatic light fields is presented. It can be applied to the
atoms with a tripod-type configuration of levels: atoms (ions) with the quantum
transition F=1 \to F=0. The scheme proposed provides a long-term trapping of
such atoms in deep light-induced potential wells. Moreover, the atom
temperature can continuously be changed by varying field parameters in quite a
large range (from super-Doppler to sub-Doppler values) without violating the
localization stability.
\\ ( http://arxiv.org/abs/1009.3118 , 74kb)
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\\
arXiv:1009.3119
Date: Thu, 16 Sep 2010 08:44:32 GMT (4064kb,D)
Title: Tunable Wigner states with dipolar atoms and molecules
Authors: J. C. Cremon, G. M. Bruun, and S. M. Reimann
Categories: cond-mat.quant-gas
Comments: 4 pages, 6 figures
\\
We study the few-body physics of trapped atoms or molecules with electric or
magnetic dipole moments aligned by an external field. Using exact numerical
diagonalization appropriate for the strongly correlated regime, as well as a
classical analysis, we show how Wigner localization emerges with increasing
coupling strength. The Wigner states exhibit non-trivial geometries due to the
anisotropy of the interaction. This leads to transitions between different
Wigner states as the tilt angle of the dipoles with the confining plane is
changed. Intriguingly, while the individual Wigner states are well described by
a classical analysis, the transitions between different Wigner states are
strongly affected by quantum statistics. This can be understood by considering
the interplay between quantum-mechanical and spatial symmetry properties.
Finally, we demonstrate that our results are relevant to experimentally
realistic systems.
\\ ( http://arxiv.org/abs/1009.3119 , 4064kb)
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\\
arXiv:1009.3120
Date: Thu, 16 Sep 2010 09:07:23 GMT (1646kb,D)
Title: Superflow of resonantly driven polaritons against a defect
Authors: E. Cancellieri, F. M. Marchetti, M. H. Szymanska, C. Tejedor
Categories: cond-mat.mes-hall cond-mat.quant-gas
Comments: 8 pages, 5 figures
\\
In the linear response approximation, coherently driven microcavity
polaritons in the pump-only configuration are expected to satisfy the Landau
criterion for superfluidity at either strong enough pump powers or small flow
velocities. Here, we solve non-perturbatively the time dependent
Gross-Pitaevskii equation describing the resonantly-driven polariton system. We
show that, even in the limit of asymptotically large densities, where in linear
response approximation the system satisfies the Landau criterion, the fluid
always experiences a residual drag force when flowing through the defect. We
illustrate the result in terms of the polariton lifetime being finite, finding
that the equilibrium limit of zero drag can only be recovered in the case of
perfect microcavities. In general, both the drag force exerted by the defect on
the fluid, as well as the height of Cerenkov radiation, and the percentage of
particles scattered by the defect, show a smooth crossover rather than a sharp
threshold-like behaviour typical of superfluids which obey the Landau
criterion.
\\ ( http://arxiv.org/abs/1009.3120 , 1646kb)
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\\
arXiv:1009.3140
Date: Thu, 16 Sep 2010 10:46:26 GMT (58kb)
Title: Engineering two-mode squeezed states of cold atomic clouds with a
superconducting stripline resonator
Authors: Pengbo Li and Fuli Li
Categories: quant-ph
Comments: To appear in Optics Communications,8pages,2figs
\\
A scheme is proposed for engineering two-mode squeezed states of two
separated cold atomic clouds positioned near the surface of a superconducting
stripline resonator. Based on the coherent magnetic coupling between the atomic
spins and a stripline resonator mode, the desired two-mode squeezed state can
be produced via precisely control on the dynamics of the system. This scheme
may be used to realize scalable on-chip quantum networks with cold atoms
coupling to stripline resonators.
\\ ( http://arxiv.org/abs/1009.3140 , 58kb)
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\\
arXiv:1009.3170
Date: Thu, 16 Sep 2010 13:21:07 GMT (1212kb)
Title: Norm preserving stochastic field equation for an ideal Bose gas in a
trap: numerical implementation and applications
Authors: S. Heller and W. T. Strunz
Categories: cond-mat.stat-mech cond-mat.quant-gas
Comments: 11 pages, 6 figures
\\
Stochastic field equations represent a powerful tool to describe the thermal
state of a trapped Bose gas. Often, such approaches are confronted with the old
problem of an ultraviolet catastrophe, which demands a cutoff at high energies.
In [1] we introduce a quantum stochastic field equation, avoiding the cutoff
problem through a fully quantum approach based on the Glauber-Sudarshan
P-function. For a close link to actual experimental setups the theory is
formulated for a fixed particle number and thus based on the canonical
ensemble. In this work the derivation and the non-trivial numerical
implementation of the equation is explained in detail. We present applications
for finite Bose gases trapped in a variety of potentials and show results for
ground state occupation numbers and their equilibrium fluctuations. Moreover,
we investigate spatial coherence properties by studying correlation functions
of various orders.
[1] S. Heller and W. T. Strunz, J. Phys. B 42, 081001 (2009).
\\ ( http://arxiv.org/abs/1009.3170 , 1212kb)
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\\
arXiv:1009.3257
Date: Thu, 16 Sep 2010 19:34:47 GMT (343kb)
Title: Stable Fulde-Ferrell-Larkin-Ovchinnikov pairing states in 2D and 3D
optical lattices
Authors: Zi Cai, Yupeng Wang, and Congjun Wu
Categories: cond-mat.quant-gas
\\
We present the study of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) pairing
states in the $p$-orbital bands in both two and three-dimensional optical
lattices. Due to the quasi one-dimensional band structure which arises from the
unidirectional hopping of the orthogonal $p$-orbitals, the pairing phase space
is not affected by spin imbalance. Furthermore, interactions build up high
dimensional phase coherence which stabilizes the FFLO states in 2D and 3D
optical lattices in a large parameter regime in the phase diagram. These FFLO
phases are stable with imposing the inhomogeneous trapping potential. Their
entropy are comparable to the normal states at finite temperatures.
\\ ( http://arxiv.org/abs/1009.3257 , 343kb)
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The replacements:
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\\
arXiv:0909.5090
replaced with revised version Fri, 10 Sep 2010 08:07:50 GMT (1893kb)
Title: Bose-Einstein condensation in dark power-law laser traps
Authors: Amine Jaouadi (LSAMA, ISMO), Naceur Gaaloul (IQ), Bruno Viaris De
Lesegno (LAC), Mourad Telmini (LSAMA), Laurence Pruvost (LAC), Eric Charron
(ISMO)
Categories: quant-ph
Journal-ref: Physical Review A: Atomic, Molecular and Optical Physics 82, 2
(2010) 023613
DOI: 10.1103/PhysRevA.82.023613
\\ ( http://arxiv.org/abs/0909.5090 , 1893kb)
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\\
arXiv:0909.1314
replaced with revised version Sat, 11 Sep 2010 16:27:49 GMT (59kb,D)
Title: Effective Potential for Ultracold Atoms at the Zero-Crossing of a
Feshbach Resonance
Authors: N. T. Zinner
Categories: cond-mat.quant-gas cond-mat.stat-mech
Comments: 5 pages, 1 figure, revised version
\\ ( http://arxiv.org/abs/0909.1314 , 59kb)
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\\
arXiv:1009.1511
replaced with revised version Sun, 12 Sep 2010 18:43:08 GMT (89kb)
Title: The second critical point for the Perfect Bose gas in
quasi-one-dimensional traps
Authors: Mathieu Beau (CPT), Valentin A. Zagrebnov (CPT)
Categories: cond-mat.quant-gas
\\ ( http://arxiv.org/abs/1009.1511 , 89kb)
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\\
arXiv:1009.1696
replaced with revised version Mon, 13 Sep 2010 05:29:41 GMT (481kb)
Title: Equilibrium Properties of Trapped Dipolar Gases at Finite Temperatures
Authors: Yuki Endo, Takahiko Miyakawa and Tetsuro Nikuni
Categories: cond-mat.other
Comments: 14 pages, 14 figures
\\ ( http://arxiv.org/abs/1009.1696 , 481kb)
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\\
arXiv:1009.0975
replaced with revised version Mon, 13 Sep 2010 12:07:27 GMT (641kb)
Title: Breathing Oscillations in Bose - Fermi Mixing Gases with Yb atoms in the
Largely Prolate Deformed Traps
Authors: Tomoyuki Maruyama, Hiroyuki Yabu
Categories: cond-mat.quant-gas nucl-th
Comments: 27 pages, 12 figures
\\ ( http://arxiv.org/abs/1009.0975 , 641kb)
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\\
arXiv:0904.4837
replaced with revised version Mon, 13 Sep 2010 15:25:35 GMT (1036kb,D)
Title: Coherent manipulation of Bose-Einstein condensates with state-dependent
microwave potentials on an atom chip
Authors: Pascal Boehi, Max F. Riedel, Johannes Hoffrogge, Jakob Reichel,
Theodor W. Haensch, Philipp Treutlein
Categories: quant-ph
Comments: 9 pages, 6 figures
Journal-ref: Nature Physics 5, 592 - 597 (2009)
DOI: 10.1038/nphys1329
\\ ( http://arxiv.org/abs/0904.4837 , 1036kb)
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\\
arXiv:1006.3258
replaced with revised version Mon, 13 Sep 2010 16:24:26 GMT (336kb)
Title: Ultracold atoms in a cavity mediated double-well system
Authors: Jonas Larson and Jani-Petri Martikainen
Categories: quant-ph cond-mat.quant-gas
Comments: 12 pages, 10 figures
Journal-ref: Phys. Rev. A 82, 033606 (2010)
DOI: 10.1103/PhysRevA.82.033606
\\ ( http://arxiv.org/abs/1006.3258 , 336kb)
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\\
arXiv:0911.0934
replaced with revised version Tue, 14 Sep 2010 14:58:33 GMT (875kb,D)
Title: Mott-Hubbard and Anderson metal-insulator transitions in correlated
lattice fermions with binary disorder
Authors: Denis Semmler, Krzysztof Byczuk, Walter Hofstetter
Categories: cond-mat.dis-nn cond-mat.quant-gas
Comments: 10 pages, 11 figures, published version
Journal-ref: Phys. Rev. B 81, 115111 (2010)
DOI: 10.1103/PhysRevB.81.115111
\\ ( http://arxiv.org/abs/0911.0934 , 875kb)
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\\
arXiv:1001.4763
replaced with revised version Tue, 14 Sep 2010 16:34:36 GMT (4844kb)
Title: Compressibility, zero sound, and effective mass of a fermionic dipolar
gas at finite temperature
Authors: J. P. Kestner, S. Das Sarma
Categories: quant-ph cond-mat.quant-gas
Comments: 19 pages, 12 figures; substantially revised and expanded
Journal-ref: Phys. Rev. A 82, 033608 (2010)
DOI: 10.1103/PhysRevA.82.033608
\\ ( http://arxiv.org/abs/1001.4763 , 4844kb)
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\\
arXiv:1006.0181 (*cross-listing*)
replaced with revised version Tue, 14 Sep 2010 18:05:07 GMT (197kb,D)
Title: The two faces of quantum sound
Authors: C. Barcelo, L.J. Garay, G. Jannes
Categories: gr-qc cond-mat.quant-gas
Comments: 12 pages, 4 figures; v3: published version
Journal-ref: Phys.Rev.D82, 044042 (2010)
DOI: 10.1103/PhysRevD.82.044042
\\ ( http://arxiv.org/abs/1006.0181 , 197kb)
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\\
arXiv:1005.1399
replaced with revised version Wed, 15 Sep 2010 01:35:07 GMT (34kb)
Title: Simulating Wess-Zumino Supersymmetry Model in Optical Lattices
Authors: Yue Yu and Kun Yang
Categories: cond-mat.quant-gas hep-th
Comments: 4 pages, 1 figure, acceptance for Phys Rev Lett
\\ ( http://arxiv.org/abs/1005.1399 , 34kb)
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\\
arXiv:0910.2431
replaced with revised version Wed, 15 Sep 2010 02:18:49 GMT (90kb)
Title: Modulated pair condensate of p-orbital ultracold fermions
Authors: Zixu Zhang, Hsiang-Hsuan Hung, Chiu Man Ho, Erhai Zhao, W. Vincent Liu
Categories: cond-mat.quant-gas cond-mat.str-el hep-ph
Comments: final version, 6 pages, 5 figures
Journal-ref: Phys. Rev. A 82, 033610 (2010)
DOI: 10.1103/PhysRevA.82.033610
\\ ( http://arxiv.org/abs/0910.2431 , 90kb)
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\\
arXiv:1009.1072
replaced with revised version Wed, 15 Sep 2010 09:58:51 GMT (434kb,D)
Title: Supersolid phases of dipolar bosons in optical lattices with a staggered
flux
Authors: O. Tieleman, A. Lazarides, and C. Morais Smith
Categories: cond-mat.quant-gas
Comments: 11 pages; added references, minor changes in text
Report-no: ITP-UU-10/32
\\ ( http://arxiv.org/abs/1009.1072 , 434kb)
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Till next time,
Matt.
--
=========================================================================
Dr M. J. Davis, Associate Professor in Physics
School of Mathematics and Physics, ph : +61 7 334 69824
The University of Queensland, fax : +61 7 336 51242
Brisbane, QLD 4072, mdavis_at_physics.uq.edu.au
Australia. www.physics.uq.edu.au/people/mdavis/
=========================================================================
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http://www.physics.uq.edu.au/people/mdavis/matts_arXiv/
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