From: Matthew Davis <mdavis_at_physics.uq.edu.au>

Date: Sun, 27 Jun 2010 21:01:34 +1000

Date: Sun, 27 Jun 2010 21:01:34 +1000

Dear subscribers,

This week's mailing was compiled by Mike Garrett, and there were 36 new

preprints and 32 replacements

------------------------------------------------------------------------------

\\

arXiv:1006.0596

Date: Thu, 3 Jun 2010 09:34:09 GMT (246kb,D)

Title: Doppler cooling of gallium atoms: 2. Simulation in complex multilevel

systems

Authors: L Rutherford, I C Lane and J F McCann

Categories: physics.atom-ph

Comments: 15 pages, 8 figures

\\

This paper derives a general procedure for the numerical solution of the

Lindblad equations that govern the coherences arising from multicoloured light

interacting with a multilevel system. A systematic approach to finding the

conservative and dissipative terms is derived and applied to the laser cooling

of gallium. An improved numerical method is developed to solve the

time-dependent master equation and results are presented for transient cooling

processes. The method is significantly more robust, efficient and accurate than

the standard method and can be applied to a broad range of atomic and molecular

systems. Radiation pressure forces and the formation of dynamic dark-states are

studied in the gallium isotope 66Ga.

\\ ( http://arxiv.org/abs/1006.0596 , 246kb)

------------------------------------------------------------------------------

\\

arXiv:1006.0493

Date: Wed, 2 Jun 2010 20:21:13 GMT (2307kb)

Title: A method to generate complex quasi-nondiffracting optical lattices

Authors: Servando Lopez-Aguayo, Yaroslav V. Kartashov, Victor A. Vysloukh,

Lluis Torner

Categories: physics.optics

Comments: 14 pages, 6 figures, to appear in Physical Review Letters

\\

We put forward a powerful technique that allows generating

quasi-non-diffracting light beams with a variety of complex transverse shapes

and topologies. We show that, e.g., spiraling patterns, patterns featuring

curved or bent bright stripes, or patterns featuring arbitrary combinations of

harmonic, Bessel, Mathieu and parabolic beams occupying different domains in

the transverse plane can be produced. The quasi-non-diffracting patterns open

up a wealth of opportunities for the manipulation of matter and optical waves,

colloidal and living particles, with applications in biophysics, and quantum,

nonlinear and atom optics.

\\ ( http://arxiv.org/abs/1006.0493 , 2307kb)

------------------------------------------------------------------------------

\\

arXiv:physics/0207074 (*cross-listing*)

Date: Thu, 18 Jul 2002 15:36:55 GMT (6kb)

Title: Bose-Einstein Condensation and Intermediate State of the Photon Gas

Authors: Levan N. Tsintsadze

Categories: physics.plasm-ph astro-ph physics.optics physics.space-ph

Comments: 9 pages

Report-no: HUBP-06/02

\\

Possibility of establishment of equilibrium between the photon and the dense

photon bunch is studied. In the case, when the density of plasma does not

change, the condition of production of the Bose-Einstein condensate is

obtained. It is shown that the inhomogeneity of density of photons leads to a

new intermediate state of the photon gas.

\\ ( http://arxiv.org/abs/physics/0207074 , 6kb)

------------------------------------------------------------------------------

\\

arXiv:1006.0506

Date: Wed, 2 Jun 2010 21:44:36 GMT (10kb)

Title: Geometric Symmetries in Superfluid Vortex Dynamics

Authors: Evgeny Kozik and Boris Svistunov

Categories: cond-mat.other physics.flu-dyn

Comments: 4 REVTeX pages

\\

Dynamics of quantized vortex lines in a superfluid feature symmetries

associated with the geometric character of the complex-valued field,

$w(z)=x(z)+iy(z)$, describing the instant shape of the line. Along with a

natural set of Noether's constants of motion, which---apart from their rather

specific expressions in terms of $w(z)$---are nothing but components of the

total linear and angular momenta of the fluid, the geometric symmetry brings

about crucial consequences for kinetics of distortion waves on the vortex

lines---the Kelvin waves. In combination with analysis of dimensions,

symmetries lead to the locality of the Kelvin-wave cascade in the wavenumber

space and provide parametric estimates for non-local sub-leading contributions.

Similar considerations apply to other systems with purely geometric degrees of

freedom.

\\ ( http://arxiv.org/abs/1006.0506 , 10kb)

------------------------------------------------------------------------------

\\

arXiv:1006.0509

Date: Wed, 2 Jun 2010 22:02:52 GMT (912kb)

Title: Observation of a finite momentum superfluid in the P-band of an optical

square lattice

Authors: Georg Wirth, Matthias \"Olschl\"ager, and Andreas Hemmerich

Categories: cond-mat.quant-gas

\\

Ultracold atoms in optical lattices provide an exceptionally pure environment

for studies of many-body quantum physics without many of the complications

usually encountered in material systems. The successful emulation of the

Hubbard model has stimulated world wide efforts to extend the scope of optical

lattice models to also capture more complex, incompletely understood scenarios

of condensed matter physics. A promising approach is to consider optical

lattices with excited bands, where the orbital degree of freedom with its

intrinsic anisotropy due to multiple orbital orientations gives rise to a

wealth of interesting new phenomena, highly relevant in the area of strongly

correlated electronic matter. While lifetimes of these excited bands on the

order of a hundred milliseconds have been observed, coherence with respect to

all propagation directions extending over many lattice sites could not be

obtained. Here we report the first observation of a superfluid in the P-band of

an optical square lattice, which exhibits full cross-dimensional coherence with

a life-time of several ten milliseconds. As a striking signature, this

superfluid does not possess a zero momentum component. Our observations are

explained by a striped superfluid order parameter composed of S-orbits and

aligned P-orbits arranged in a chequerboard pattern, which breaks the

translational and rotational symmetries of the lattice potential. Our

experiment opens up the realms of orbital superfluids to investigations with

optical lattice models.

\\ ( http://arxiv.org/abs/1006.0509 , 912kb)

------------------------------------------------------------------------------

\\

arXiv:1006.0552

Date: Thu, 3 Jun 2010 04:29:02 GMT (746kb)

Title: Scissors mode of trapped dipolar gases

Authors: Mitsuru Tohyama

Categories: cond-mat.quant-gas

\\

We study the scissors modes of dipolar boson and fermion gases trapped in a

spherically symmetric potential. We use the harmonic oscillator states to solve

the time-dependent Gross-Pitaevskii equation for bosons and the time-dependent

Hartree-Fock equation for fermions. It is pointed out that the scissors modes

of bosons and fermions can be of quite different nature.

\\ ( http://arxiv.org/abs/1006.0552 , 746kb)

------------------------------------------------------------------------------

\\

arXiv:1006.0636

Date: Thu, 3 Jun 2010 13:03:41 GMT (971kb)

Title: Stabilization and pumping of giant vortices in dilute Bose-Einstein

condensates

Authors: Pekko Kuopanportti and Mikko M\"ott\"onen

Categories: cond-mat.quant-gas

Comments: 7 pages, 6 figures (of which 5 in color)

\\

Recently, it was shown that giant vortices with arbitrarily large quantum

numbers could be created in dilute Bose-Einstein condensates by cyclically

pumping vorticity into the condensate. However, multiply quantized vortices are

typically dynamically unstable in harmonically trapped nonrotated condensates,

which poses a serious challenge to the vortex pump procedure. In this

theoretical study, we investigate how the giant vortices can be stabilized by

the application of a Gaussian potential peak along the vortex core. To

demonstrate the efficiency of this stabilization method, we simulate the

adiabatic creation of an unsplit 20-quantum vortex using the vortex pump.

\\ ( http://arxiv.org/abs/1006.0636 , 971kb)

------------------------------------------------------------------------------

\\

arXiv:1006.0339

Date: Wed, 2 Jun 2010 10:01:37 GMT (52kb)

Title: Long-Time Coherence in Echo Spectroscopy of Trapped Atoms

Authors: Arseni Goussev and Philippe Jacquod

Categories: quant-ph cond-mat.other physics.atom-ph

Comments: 4 pages, 3 figures

\\

Motivated by recent atom optics experiments, we investigate a new class of

fidelity functions describing the reconstruction of quantum states by

time-reversal operations as $M_{\mathrm{Da}}(t) = | \langle \psi | e^{i H_2 t /

2} e^{i H_1 t / 2} e^{-i H_2 t / 2} e^{-i H_1 t / 2} | \psi \rangle |^2$. We

show that the decay of $M_{\mathrm{Da}}$ is quartic in time at short times, and

that it freezes well above the ergodic value at long times, when $H_2-H_1$ is

not too large. The long-time saturation value of $M_{\mathrm{Da}}$ contains

easily extractable information on the strength of decoherence in these systems.

\\ ( http://arxiv.org/abs/1006.0339 , 52kb)

------------------------------------------------------------------------------

\\

arXiv:1006.0369

Date: Wed, 2 Jun 2010 13:14:25 GMT (5kb)

Title: Elementary Excitations in Quantum Fermi Liquid

Authors: Nodar L.Tsintsadze and Levan N.Tsintsadze

Categories: quant-ph cond-mat.other

Comments: Submitted to Physical Review Letters

\\

Landau's theory of Fermi liquids is generalized by incorporating the de

Broglie waves diffraction. A newly derived kinetic equation of the Fermi

particles is used to derive a general dispersion relation and the excitation of

zero sound is studied. A new mode is found due to the quantum correction. It is

shown that the zero sound can exist even in an ideal Fermi gas. We also

disclose a new branch of frequency spectrum due to the weak interaction.

\\ ( http://arxiv.org/abs/1006.0369 , 5kb)

------------------------------------------------------------------------------

\\

arXiv:1006.0450

Date: Wed, 2 Jun 2010 17:11:28 GMT (1775kb)

Title: Loss, revival and regain of atomic interference: An explanation grounded

on the momentum transfer during photon-atom scattering events

Authors: M. Davidovic, A. S. Sanz, M. Bozic, D. Arsenovic

Categories: quant-ph physics.atom-ph physics.optics

Comments: 17 pages, 12 figures

\\

Here, interference visibility in a three-grating atom interferometer with

presence of photon-atom scattering events is analyzed. The model considered is

entirely based on the atom wave function and the effects caused on it by both

scattering events and subsequent diffractions through the interferometer

gratings. A functional dependence of the interference visibility on the

probability distribution of transferred momentum (by the photons) to the atoms

is thus found, which is used to interpret the available experimental data.

Within this model there is no need, therefore, to appeal for concepts such as

"which-way" information or entanglement to explain the losses, revivals and

regains of quantum coherence in this type of experiments. Rather, visibility

losses and revivals are explained in terms of the sudden change induced in the

atomic wave function by the momentum transfer, while regains are directly

related to the visibility functional dependence on the statistical distribution

of transferred momentum of the sample of atoms selected after passing through

the interferometer (before they are detected).

\\ ( http://arxiv.org/abs/1006.0450 , 1775kb)

------------------------------------------------------------------------------

\\

arXiv:1006.0233

Date: Tue, 1 Jun 2010 20:01:07 GMT (47kb)

Title: Slow relaxation in long-range interacting systems with stochastic

dynamics

Authors: Shamik Gupta and David Mukamel

Categories: cond-mat.stat-mech

Comments: 4+ pages, 2 figures

\\

Quasistationary states are long-lived nonequilibrium states, observed in some

systems with long-range interactions under deterministic Hamiltonian evolution.

These intriguing non-Boltzmann states relax to equilibrium over times which

diverge algebraically with the system size. To test the robustness of this

phenomenon to non-deterministic dynamical processes, we have generalized the

paradigmatic model exhibiting such a behavior, the Hamiltonian Mean-Field

model, to include energy-conserving stochastic processes. Analysis, based on

the Boltzmann equation, a scaling approach and numerical studies, demonstrates

that in the long time limit, the system relaxes to the equilibrium state on

timescales which do not diverge algebraically with the system size. Thus,

quasistationarity takes place only as a crossover phenomenon on times

determined by the strength of the stochastic process.

\\ ( http://arxiv.org/abs/1006.0233 , 47kb)

------------------------------------------------------------------------------

\\

arXiv:1006.0357

Date: Wed, 2 Jun 2010 12:29:52 GMT (4320kb,D)

Title: Finite-temperature effects on the superfluid Bose-Einstein condensation

of confined ultracold atoms in three-dimensional optical lattices

Authors: T. P. Polak, T. K. Kope\'c

Categories: cond-mat.quant-gas

Journal-ref: J. Phys. B: At. Mol. Opt. Phys. 42 095302, (2009)

DOI: 10.1088/0953-4075/42/9/095302

\\

We discuss the finite-temperature phase diagram in the three-dimensional

Bose-Hubbard (BH) model in the strong correlation regime, relevant for

Bose-Einstein condensates in optical lattices, by employing a quantum rotor

approach. In systems with strong on site repulsive interactions, the rotor U(1)

phase variable dual to the local boson density emerges as an important

collective field. After establishing the connection between the rotor

construction and the the on--site interaction in the BH model the robust

effective action formalism is developed which allows us to study the superfluid

phase transition in various temperature--interaction regimes.

\\ ( http://arxiv.org/abs/1006.0357 , 4320kb)

------------------------------------------------------------------------------

\\

arXiv:1006.0453

Date: Wed, 2 Jun 2010 17:20:15 GMT (52kb)

Title: Non-abelian anyons from degenerate Landau levels of ultracold atoms in

artificial gauge potentials

Authors: Michele Burrello and Andrea Trombettoni

Categories: cond-mat.quant-gas

\\

We study ultracold atoms in a realistic artificial non-abelian gauge

potential with constant Wilson loop: the non-abelian part of the vector

potential makes the Landau levels non-degenerate, and, in presence of strong

intra-species interactions, deformed Laughlin ground states occur. However, at

the degeneracy points of Landau levels, non-abelian fractional quantum Hall

states appear and explicit analytical results can be obtained. These ground

states, including deformed Moore-Read states (presenting Ising anyons as

quasi-holes), are studied both for fermionic and bosonic gases.

\\ ( http://arxiv.org/abs/1006.0453 , 52kb)

------------------------------------------------------------------------------

\\

arXiv:1005.5284 (*cross-listing*)

Date: Fri, 28 May 2010 12:51:23 GMT (688kb,D)

Title: Generalized Hartree-Fock Theory for Interacting Fermions in Lattices:

Numerical Methods

Authors: Christina V. Kraus and J. Ignacio Cirac

Categories: quant-ph cond-mat.other

Comments: 16 pages, 22 figures

\\

We present numerical methods to solve the Generalized Hartree-Fock theory for

fermionic systems in lattices, both in thermal equilibrium and out of

equilibrium. Specifically, we show how to determine the covariance matrix

corresponding to the Fermionic Gaussian state that optimally approximates the

quantum state of the fermions. The methods apply to relatively large systems,

since their complexity only scales quadratically with the number of lattice

sites. Moreover, they are specially suited to describe inhomogenous systems, as

those typically found in recent experiments with atoms in optical lattices, at

least in the weak interaction regime. As a benchmark, we have applied them to

the two-dimensional Hubbard model on a 10x10 lattice with and without an

external confinement.

\\ ( http://arxiv.org/abs/1005.5284 , 688kb)

------------------------------------------------------------------------------

\\

arXiv:1006.0117

Date: Tue, 1 Jun 2010 11:51:45 GMT (326kb)

Title: Quantum tunneling time of a Bose-Einstein condensate traversing through

a laser-induced potential barrier

Authors: Zhenglu Duan, Bixuan Fan, Chun-Hua Yuan, Jing Cheng, Shiyao Zhu and

Weiping Zhang

Categories: quant-ph cond-mat.quant-gas

Comments: 4 pages, 5 figures

Journal-ref: Phys. Rev. A 81, 055602 (2010)

\\

We theoretically study the effect of atomic nonlinearity on the tunneling

time in the case of an atomic Bose-Einstein condensate (BEC) traversing the

laser-induced potential barrier. The atomic nonlinearity is controlled to

appear only in the region of the barrier by employing the Feshbach resonance

technique to tune interatomic interaction in the tunneling process. Numerical

simulation shows that the atomic nonlinear effect dramatically changes the

tunneling behavior of the BEC matter wave packet, and results in the violation

of Hartman effect and the occurrence of negative tunneling time.

\\ ( http://arxiv.org/abs/1006.0117 , 326kb)

------------------------------------------------------------------------------

\\

arXiv:1006.0012

Date: Mon, 31 May 2010 20:35:19 GMT (369kb)

Title: Quantum quench in 1D: Coherent inhomogeneity amplification and

'supersolitons'

Authors: Matthew S. Foster, Emil A. Yuzbashyan, Boris L. Altshuler

Categories: cond-mat.quant-gas cond-mat.stat-mech

Comments: 5 pages, 4 figures

\\

We study a quantum quench in a 1D system possessing Luttinger liquid (LL) and

Mott insulating ground states before and after the quench, respectively. We

show that the quench induces power law amplification in time of any particle

density inhomogeneity in the initial LL ground state. The scaling exponent is

set by the fractionalization of the LL quasiparticle number relative to the

insulator. As an illustration, we consider the traveling density waves launched

from an initial localized density bump. While these waves exhibit a particular

rigid shape, their amplitudes grow without bound.

\\ ( http://arxiv.org/abs/1006.0012 , 369kb)

------------------------------------------------------------------------------

\\

arXiv:1006.0198

Date: Tue, 1 Jun 2010 17:45:36 GMT (1233kb)

Title: An eccentrically perturbed Tonks-Girardeau gas

Authors: J. Goold, M. Krych, Z. Idziaszek, T. Fogarty and Th. Busch

Categories: cond-mat.quant-gas quant-ph

Comments: Comments and suggestions are welcome

\\

We investigate the static and dynamic properties of a Tonks-Girardeau gas in

a harmonic trap with an eccentric $\delta$-perturbation of variable strength.

For this we first find the analytic eigensolution of the single particle

problem and use this solution to calculate the spatial density and energy

profiles of the many particle gas as a function of the strength and position of

the perturbation. We find that the crystal nature of the Tonks state is

reflected in both the lowest occupation number and momentum distribution of the

gas. As a novel application of our model, we study the time evolution of the

the spatial density after a sudden removal of the perturbation. The dynamics

exhibits collapses and revivals of the original density distribution which

occur in units of the trap frequency. This is reminiscent of the Talbot effect

from classical optics.

\\ ( http://arxiv.org/abs/1006.0198 , 1233kb)

------------------------------------------------------------------------------

\\

arXiv:1006.0181

Date: Tue, 1 Jun 2010 16:47:46 GMT (196kb,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

\\

Fluctuations around a Bose-Einstein condensate can be described by means of

Bogolubov theory leading to the notion of quasiparticle and antiquasiparticle

familiar to non-relativistic condensed matter practitioners. On the other hand,

we already know that these perturbations evolve according to a relativistic

Klein-Gordon equation in the long wavelength approximation. For shorter

wavelengths, we show that this equation acquires nontrivial corrections which

modify the Klein-Gordon product. In this approach, quasiparticles can also be

defined (up to the standard ambiguities due to observer-dependence). We

demonstrate that---in the low as well as in the high energy regimes---both

concepts of quasiparticle are actually the same, regardless of the formalism

(Bogolubov or Klein-Gordon) used to describe them. These results also apply to

any barotropic, inviscid, irrotational fluid, with or without quantum

potential. Finally, we illustrate how the quantization of these systems of

quasiparticles proceeds by analyzing a stationary configuration containing an

acoustic horizon. We show that there are several possible choices of a regular

vacuum state, including a regular generalization of the Boulware vacuum. Issues

such us Hawking radiation crucially depend on this vacuum choice.

\\ ( http://arxiv.org/abs/1006.0181 , 196kb)

------------------------------------------------------------------------------

\\

arXiv:1005.5405

Date: Fri, 28 May 2010 21:48:44 GMT (127kb)

Title: Solving the Boltzmann Equation on GPU

Authors: Aldo Frezzotti, Gian Pietro Ghiroldi, Livio Gibelli

Categories: physics.comp-ph physics.flu-dyn

Comments: 18 pages, 3 pseudo-codes, 6 figures, 1 table

\\

We show how to accelerate the direct solution of the Boltzmann equation using

Graphics Processing Units (GPUs). In order to fully exploit the computational

power of the GPU, we choose a method of solution which combines a finite

difference discretization of the free-streaming term with a Monte Carlo

evaluation of the collision integral. The efficiency of the code is

demonstrated by solving the two-dimensional driven cavity flow. Computational

results show that it is possible to cut down the computing time of the

sequential code of two order of magnitudes. This makes the proposed method of

solution a viable alternative to particle simulations for studying unsteady low

Mach number flows.

\\ ( http://arxiv.org/abs/1005.5405 , 127kb)

------------------------------------------------------------------------------

\\

arXiv:0911.0747

Date: Wed, 4 Nov 2009 07:56:18 GMT (1444kb)

Date (revised v2): Mon, 31 May 2010 09:13:38 GMT (1439kb)

Title: Exploring the Thermodynamics of a Universal Fermi Gas

Authors: Sylvain Nascimb\`ene (LKB - Lhomond), Nir Navon (LKB - Lhomond),

Kaijun Jiang (LKB - Lhomond), Fr\'ed\'eric Chevy (LKB - Lhomond), Christophe

Salomon (LKB - Lhomond)

Categories: cond-mat.quant-gas cond-mat.stat-mech physics.gen-ph

Comments: 8 pages, 5 figures

Journal-ref: Nature 463 (2010) 1057

DOI: 10.1038/nature08814

\\

From sand piles to electrons in metals, one of the greatest challenges in

modern physics is to understand the behavior of an ensemble of strongly

interacting particles. A class of quantum many-body systems such as neutron

matter and cold Fermi gases share the same universal thermodynamic properties

when interactions reach the maximum effective value allowed by quantum

mechanics, the so-called unitary limit [1,2]. It is then possible to simulate

some astrophysical phenomena inside the highly controlled environment of an

atomic physics laboratory. Previous work on the thermodynamics of a

two-component Fermi gas led to thermodynamic quantities averaged over the trap

[3-5], making it difficult to compare with many-body theories developed for

uniform gases. Here we develop a general method that provides for the first

time the equation of state of a uniform gas, as well as a detailed comparison

with existing theories [6,14]. The precision of our equation of state leads to

new physical insights on the unitary gas. For the unpolarized gas, we prove

that the low-temperature thermodynamics of the strongly interacting normal

phase is well described by Fermi liquid theory and we localize the superfluid

transition. For a spin-polarized system, our equation of state at zero

temperature has a 2% accuracy and it extends the work of [15] on the phase

diagram to a new regime of precision. We show in particular that, despite

strong correlations, the normal phase behaves as a mixture of two ideal gases:

a Fermi gas of bare majority atoms and a non-interacting gas of dressed

quasi-particles, the fermionic polarons [10,16-18].

\\ ( http://arxiv.org/abs/0911.0747 , 1439kb)

------------------------------------------------------------------------------

\\

arXiv:0911.1525

Date: Sun, 8 Nov 2009 19:15:16 GMT (42kb)

Date (revised v2): Mon, 8 Mar 2010 10:03:15 GMT (45kb)

Date (revised v3): Mon, 31 May 2010 08:45:53 GMT (55kb)

Title: Classical description of quantum randomness using stochastic gauge

systems

Authors: Michel Feldmann

Categories: quant-ph gr-qc physics.gen-ph

Comments: 40 pages, 1 figure. Important corrections. Emphase on entanglement

entropy and non-quantum systems

\\

We present a classical probability model appropriate to the description of

quantum randomness. This tool, that we have called stochastic gauge system,

constitutes a contextual scheme in which the Kolmogorov probability space

depends upon the experimental setup, in accordance with quantum mechanics.

Therefore, the probability space behaves like a gauge parameter. We discuss the

technical issues of this theory and apply the concept to classically emulate

quantum entangled states and even `super-quantum' systems. We exhibit bipartite

examples leading to maximum violation of Bell-CHSH inequalities like EPR pairs

or exceeding the Tsirelson bound like PR-boxes, as well as tripartite cases

simulating GHZ or W-states. We address also the question of partially

correlated systems and multipartite entanglements. In this model, the classical

equivalent of the entanglement entropy is identified with the Kullback-Leibler

divergence. Hence, we propose a natural generalisation of this function to

multipartite systems, leading to a simple evaluation of the degree of

entanglement and determining the bounds of maximum entanglement. Finally, we

obtain a constructive necessary and sufficient condition of multipartite

entanglement.

\\ ( http://arxiv.org/abs/0911.1525 , 55kb)

------------------------------------------------------------------------------

\\

arXiv:1005.5463

Date: Sat, 29 May 2010 15:37:15 GMT (110kb)

Title: Two simple systems with cold atoms: quantum chaos tests and

nonequilibrium dynamics

Authors: Cavan Stone (1), Yassine Ait El Aoud (1), Vladimir A Yurovsky (2),

Maxim Olshanii (1) ((1) Department of Physics, University of Massachusetts

Boston, (2) School of Chemistry, Tel Aviv University)

Categories: cond-mat.quant-gas quant-ph

Comments: 18 pages, 9 figures

Journal-ref: New J. Phys. 12, 055022 (2010)

\\

This article is an attempt to provide a link between the quantum

nonequilibrium dynamics of cold gases and fifty years of progress in the

lowdimensional quantum chaos. We identify two atomic systems lying on the

interface: two interacting atoms in a harmonic multimode waveguide and an

interacting two-component Bose-Bose mixture in a double-well potential. In

particular, we study the level spacing distribution, the wavefunction

statistics, the eigenstate thermalization, and the ability to thermalize in a

relaxation process as such.

\\ ( http://arxiv.org/abs/1005.5463 , 110kb)

------------------------------------------------------------------------------

\\

arXiv:1005.5487

Date: Sat, 29 May 2010 22:22:59 GMT (622kb)

Title: Cold Atom Qubits

Authors: Dmitry Solenov, Dmitry Mozyrsky

Categories: cond-mat.quant-gas quant-ph

\\

We discuss a laser-trapped cold-atom superfluid qubit system. Each qubit is

proposed as a macroscopic two-state system based on a set of Bose-Einstein

condensate (BEC) currents circulating in a ring, cut with a Josephson barrier.

We review the effective low energy description of a single BEC ring. In

particular, it is demonstrated that such system has a set of metastable current

states which, for certain range of parameters, form an effective two-state

system, or a qubit. We show how this qubit can be initialized and manipulated

with currently available laser-trapping techniques. We also discuss mechanisms

of coupling several such ring qubits as well as measuring individual qubit-ring

systems.

\\ ( http://arxiv.org/abs/1005.5487 , 622kb)

------------------------------------------------------------------------------

\\

arXiv:1005.5383

Date: Fri, 28 May 2010 20:00:05 GMT (138kb)

Title: Interacting bosons in one dimension and Luttinger liquid theory

Authors: Adrian Del Maestro and Ian Affleck

Categories: cond-mat.stat-mech

Comments: 4 pages, 3 figures

\\

Harmonically trapped ultra-cold atoms and helium-4 in nanopores provide new

experimental realizations of bosons in one dimension, motivating the search for

a more complete theoretical understanding of their low energy properties. Worm

algorithm path integral quantum Monte Carlo results for interacting bosons

restricted to the one dimensional continuum are compared to the finite

temperature and system size predictions of Luttinger liquid theory. For large

system sizes at low temperature, excellent agreement is obtained after

including the leading irrelevant interactions in the Hamiltonian which are

determined explicitly.

\\ ( http://arxiv.org/abs/1005.5383 , 138kb)

------------------------------------------------------------------------------

\\

arXiv:1005.5477

Date: Sat, 29 May 2010 19:06:10 GMT (261kb)

Title: Effective time-independent description of optical lattices with periodic

driving

Authors: Andreas Hemmerich

Categories: cond-mat.quant-gas

Comments: 10 pages, 5 figures

Journal-ref: PRA 2010

\\

For a periodically driven quantum system an effective time-independent

Hamiltonian is derived with an eigen-energy spectrum, which in the regime of

large driving frequencies approximates the quasi-energies of the corresponding

Floquet Hamiltonian. The effective Hamiltonian is evaluated for the case of

optical lattice models in the tight-binding regime subjected to strong periodic

driving. Three scenarios are considered: a periodically shifted one-dimensional

(1D) lattice, a two-dimensional (2D) square lattice with inversely phased

temporal modulation of the well depths of adjacent lattice sites, and a 2D

lattice subjected to an array of microscopic rotors commensurate with its

plaquette structure. In case of the 1D scenario the rescaling of the tunneling

energy, previously considered by Eckardt et al. in Phys. Rev. Lett. 95, 260404

(2005), is reproduced. The 2D lattice with well depth modulation turns out as a

generalization of the 1D case. In the 2D case with staggered rotation, the

expression previously found in the case of weak driving by Lim et al. in Phys.

Rev. Lett. 100, 130402 (2008) is generalized, such that its interpretation in

terms of an artificial staggered magnetic field can be extended into the regime

of strong driving.

\\ ( http://arxiv.org/abs/1005.5477 , 261kb)

------------------------------------------------------------------------------

\\

arXiv:1005.5488

Date: Sat, 29 May 2010 22:29:29 GMT (1533kb)

Title: Kinetic Thomas-Fermi solutions of the Gross-Pitaevskii equation

Authors: M. \"Olschl\"ager, G. Wirth, C. Morais Smith, A. Hemmerich

Categories: cond-mat.quant-gas

Journal-ref: Opt. Commun., 282, 1472 (2009)

\\

Approximate solutions of the Gross-Pitaevskii (GP) equation, obtained upon

neglection of the kinetic energy, are well known as Thomas-Fermi solutions.

They are characterized by the compensation of the local potential by the

collisional energy. In this article we consider exact solutions of the

GP-equation with this property and definite values of the kinetic energy, which

suggests the term "kinetic Thomas-Fermi" (KTF) solutions. We point out that a

large class of light-shift potentials gives rise to KTF-solutions. As

elementary examples, we consider one-dimensional and two-dimensional optical

lattice scenarios, obtained by means of the superposition of two, three and

four laser beams, and discuss the stability properties of the corresponding

KTF-solutions. A general method is proposed to excite two-dimensional

KTF-solutions in experiments by means of time-modulated light-shift potentials.

\\ ( http://arxiv.org/abs/1005.5488 , 1533kb)

------------------------------------------------------------------------------

\\

arXiv:1005.5493

Date: Sun, 30 May 2010 01:36:45 GMT (641kb)

Title: Fractional quantum Hall effect arising from repulsive three body

interaction

Authors: Arkadiusz Wojs, Csaba Toke, Jainendra K. Jain

Categories: cond-mat.str-el

Comments: 4 pages, 4 figures

\\

We consider a collection of fermions in a strong magnetic field coupled by a

purely three body repulsive interaction, and predict the formation of composite

fermions, leading to a remarkably rich phase diagram containing a host of

fractional quantum Hall states, a composite fermion Fermi sea, and a pairing

transition. This is entirely unexpected, because the appearance of composite

fermions and fractional quantum Hall effect is ordinarily thought to be a

result of strong two-body repulsion. Recent theoretical and experimental

breakthroughs in ultra-cold atoms and molecules have facilitated the

realization of such a system, where this physics can be tested.

\\ ( http://arxiv.org/abs/1005.5493 , 641kb)

------------------------------------------------------------------------------

\\

arXiv:1005.5690

Date: Mon, 31 May 2010 14:48:39 GMT (314kb,D)

Title: Localization of cold atoms in state-dependent optical lattices via a

Rabi pulse

Authors: Birger Horstmann, Stephan Duerr, and Tommaso Roscilde

Categories: cond-mat.quant-gas

Comments: 4 pages, 4 figures

\\

We propose a novel realization of Anderson localization in non-equilibrium

states of ultracold atoms trapped in state-dependent optical lattices. The

disorder potential leading to localization is generated with a Rabi pulse

transfering a fraction of the atoms into a different internal state for which

tunneling between lattice sites is suppressed. Atoms with zero tunneling create

a quantum superposition of different random potentials, localizing the mobile

atoms. We investigate the dynamics of the mobile atoms after the Rabi pulse for

non-interacting and weakly interacting bosons, and we show that the evolved

wavefunction attains a quasi-stationary profile with exponentially decaying

tails, characteristic of Anderson localization. The localization length is seen

to increase with increasing disorder and interaction strength, oppositely to

what is expected for equilibrium localization.

\\ ( http://arxiv.org/abs/1005.5690 , 314kb)

------------------------------------------------------------------------------

\\

arXiv:1005.5710

Date: Mon, 31 May 2010 17:07:16 GMT (2kb)

Title: Reply to Comment on "Quantum Entangled Dark Solitons formed by Ultracold

Atoms in Optical Lattices"

Authors: R. V. Mishmash and L. D. Carr

Categories: cond-mat.quant-gas

Comments: 1 page, reply to arXiv:1001.1045

\\

We reply to Jacek Dziarmaga, Piotr Deuar, and Krzysztof Sacha's comment,

arXiv:1001.1045, supporting the authors' simulations but differentiating

between near-mean-field and strongly quantum regimes. We clarify that we have

three lines of evidence on decay of dark solitons and connect our work to

Lieb's Type-II excitations and the true meaning of a quantum dark soliton.

\\ ( http://arxiv.org/abs/1005.5710 , 2kb)

------------------------------------------------------------------------------

\\

arXiv:1005.5174

Date: Thu, 27 May 2010 20:42:54 GMT (588kb)

Title: Spin transport in coupled spinor Bose gases

Authors: J.M. McGuirk

Categories: physics.atom-ph cond-mat.quant-gas

\\

We report direct measurements of spin transport in a trapped, partially

condensed spinor Bose gas. Detailed analyses of spin flux in this

out-of-equilibrium quantum gas are performed by monitoring the flow of atoms in

different hyperfine spin states. The main mechanisms for motion in this system

are exchange scattering and potential energy inhomogeneity, which lead to spin

waves in the normal component and domain formation in the condensate. We find a

large discrepancy in domain formation timescales with those predicted by

potential-driven formation, indicating strong coupling of the condensate to the

normal component spin wave.

\\ ( http://arxiv.org/abs/1005.5174 , 588kb)

------------------------------------------------------------------------------

\\

arXiv:1005.5224

Date: Fri, 28 May 2010 06:35:58 GMT (179kb)

Title: Quantum decoherence in a hybrid atom-optical system of a one-dimensional

coupled-resonator waveguide and an atom

Authors: Jing Lu, Lan Zhou, H. C. Fu, Le-Man Kuang

Categories: quant-ph

Comments: 7 pages, 3 figures, to appear in Phys. Rev. A

\\

Decoherence for a one-dimensional coupled-resonator waveguide with a

two-level system inside one of resonators, induced by their interaction with

corresponding environments, is investigated. Each environment is modeled as a

continuum of harmonic oscillators. By finding the eigenstates of the hybrid

system, which is the dressed state of the hybrid system, we calculate the

lifetime of one excitation, which characterizes the existence of quantum

coherence in such hybrid system and the basic quantum nature.

\\ ( http://arxiv.org/abs/1005.5224 , 179kb)

------------------------------------------------------------------------------

\\

arXiv:1005.5306

Date: Fri, 28 May 2010 14:50:01 GMT (435kb)

Title: Feshbach resonances of harmonically trapped atoms

Authors: Philipp-Immanuel Schneider, Yulian V. Vanne, and Alejandro Saenz

Categories: cond-mat.quant-gas quant-ph

Comments: 4 pages, 3 figures

\\

Employing a short-range two-channel description we derive an analytic

equation for the eigenenergies and contribution of the resonant bound state

(RBS) of atoms in harmonic traps at a Feshbach resonance. On this basis we

obtain a new parameterization of the energy-dependent scattering length which

differs significantly from the one previously employed. We validate the model

by comparison with experiments and full numerical calculations for 6Li-87Rb.

Finally, we explore a new resonance phenomenon arising in traps -- a splitting

between the resonance and the maximal RBS admixture -- which is demonstrated to

have important impact on atom-loss processes.

\\ ( http://arxiv.org/abs/1005.5306 , 435kb)

------------------------------------------------------------------------------

\\

arXiv:1005.5212

Date: Fri, 28 May 2010 04:31:42 GMT (1228kb)

Title: Heating and Cooling in Adiabatic Mixing process

Authors: Jing Zhou, Zi Cai, Xu-Bo Zou, and Guang-Can Guo

Categories: cond-mat.quant-gas

Comments: 5 pages, 5 figures

\\

We study the effect of interaction on the temperature change in the process

of adiabatic mixing a two-component fermi gases by the real-space Bogoliubov-de

Gennes (BdG) method. We find that in the process of adiabatic mixing, the

competition of the adiabatic expansion and the attractive interaction make it

possible to cool or heal the system depending on strength interactions. The

change of temperature in a bulk system and a trapped system have been

investigated respectively.

\\ ( http://arxiv.org/abs/1005.5212 , 1228kb)

------------------------------------------------------------------------------

\\

arXiv:1005.5272

Date: Fri, 28 May 2010 12:01:12 GMT (2787kb)

Title: Weakly linked binary mixtures of F=1 87-Rb Bose-Einstein condensates

Authors: M. Mele-Messeguer, B. Julia-Diaz, M. Guilleumas, A. Polls and A.

Sanpera

Categories: cond-mat.quant-gas

Comments: 44 pages, 19 figures

\\

We present a study of binary mixtures of Bose-Einstein condensates confined

in a double-well potential within the framework of the mean field

Gross-Pitaevskii equation. We reexamine both the single component and the

binary mixture cases for such a potential, and we investigate in which

situations a simpler two-mode approach leads to an accurate description of

their dynamics. We also estimate the validity of the most usual dimensionality

reductions used to solve the Gross-Pitaevskii equations. To this end, we

compare both the semi-analytical two-mode approaches and the numerical

simulations of the 1D reductions with the full 3D numerical solutions of the

Gross-Pitaevskii equation. Our analysis provides a guide to clarify the

validity of several simplified models that describe mean field non-linear

dynamics, using an experimentally feasible binary mixture of an F=1 spinor

condensate with two of its Zeeman manifolds populated, m=+1 and m=-1.

\\ ( http://arxiv.org/abs/1005.5272 , 2787kb)

------------------------------------------------------------------------------

\\

arXiv:1005.5282

Date: Fri, 28 May 2010 12:50:10 GMT (27kb)

Title: Electromagnetic and phonon modes for superfluid He-4 with a disk

resonator

Authors: V.M. Loktev and M.D. Tomchenko

Categories: cond-mat.other

Comments: 9 pages, 1 figure

\\

We find the distribution of the electromagnetic field inside and outside a

dielectric disk resonator placed in He-II. It is shown that this field consists

of a collection of "circular" (c-) photons. The wave function \Psi_c of a

c-phonon for the He-II + disk system is calculated in the zero-order

approximation in interaction. Due to the symmetry of the problem, the structure

of \Psi_c is such that a c-phonon possesses, similarly to a c-photon of the

resonator, a definite energy and an angular momentum with respect to the disk

axis, but it does not possess a definite momentum in the disk plane.

\\ ( http://arxiv.org/abs/1005.5282 , 27kb)

------------------------------------------------------------------------------

\\

arXiv:1005.5340

Date: Fri, 28 May 2010 17:37:40 GMT (1726kb,D)

Title: A Parallel Iterative Method for Computing Molecular Absorption Spectra

Authors: Peter Koval, Dietrich Foerster, and Olivier Coulaud

Categories: cond-mat.other

Comments: 20 pages, 17 figures, 3 tables

\\

We describe a fast parallel iterative method for computing molecular

absorption spectra within TDDFT linear response and using the LCAO method. We

use a local basis of "dominant products" to parametrize the space of orbital

products that occur in the LCAO approach. In this basis, the dynamical

polarizability is computed iteratively within an appropriate Krylov subspace.

The iterative procedure uses a a matrix-free GMRES method to determine the

(interacting) density response. The resulting code is about one order of

magnitude faster than our previous full-matrix method. This acceleration makes

the speed of our TDDFT code comparable with codes based on Casida's equation.

The implementation of our method uses hybrid MPI and OpenMP parallelization in

which load balancing and memory access are optimized. To validate our approach

and to establish benchmarks, we compute spectra of large molecules on various

types of parallel machines.

The methods developed here are fairly general and we believe they will find

useful applications in molecular physics/chemistry, even for problems that are

beyond TDDFT, such as organic semiconductors, particularly in photovoltaics.

\\ ( http://arxiv.org/abs/1005.5340 , 1726kb)

------------------------------------------------------------------------------

The replacements:

------------------------------------------------------------------------------

\\

arXiv:1002.1022

replaced with revised version Thu, 3 Jun 2010 18:04:32 GMT (352kb)

Title: Universal properties in ultracold ion-atom interactions

Authors: Bo Gao

Categories: physics.atom-ph physics.chem-ph

Comments: 4 pages, 2 figures

Journal-ref: Physical Review Letters 104, 213201 (2010)

DOI: 10.1103/PhysRevLett.104.213201

\\ ( http://arxiv.org/abs/1002.1022 , 352kb)

------------------------------------------------------------------------------

\\

arXiv:1004.1742

replaced with revised version Thu, 3 Jun 2010 08:57:32 GMT (696kb,D)

Title: Fine-tuning molecular energy levels by nonresonant laser pulses

Authors: Mikhail Lemeshko, Bretislav Friedrich

Categories: physics.chem-ph physics.atm-clus physics.atom-ph physics.optics quant-ph

Comments: 9 pages, 9 figures, 4 tables

DOI: 10.1021/jp1032299

\\ ( http://arxiv.org/abs/1004.1742 , 696kb)

------------------------------------------------------------------------------

\\

arXiv:1002.1354

replaced with revised version Thu, 3 Jun 2010 01:49:45 GMT (2118kb)

Title: Particle Entanglement in Rotating Gases

Authors: Zhao Liu and Heng Fan

Categories: quant-ph

Comments: 7 pages, 9 figures

Journal-ref: PRA, 81, 062302 (2010)

DOI: 10.1103/PhysRevA.81.062302

\\ ( http://arxiv.org/abs/1002.1354 , 2118kb)

------------------------------------------------------------------------------

\\

arXiv:0910.4447

replaced with revised version Thu, 3 Jun 2010 05:24:09 GMT (630kb)

Title: Resonant scattering effect in spectroscopies of interacting atomic gases

Authors: M. J. Leskinen, J. Kajala, and J. J. Kinnunen

Categories: cond-mat.str-el cond-mat.quant-gas cond-mat.supr-con

Comments: Minor revision. Added 2 pages and 2 figures

\\ ( http://arxiv.org/abs/0910.4447 , 630kb)

------------------------------------------------------------------------------

\\

arXiv:0911.0875

replaced with revised version Thu, 3 Jun 2010 18:40:19 GMT (2649kb,D)

Title: Crossover from adiabatic to sudden interaction quenches in the Hubbard

model: Prethermalization and nonequilibrium dynamics

Authors: Michael Moeckel and Stefan Kehrein

Categories: cond-mat.quant-gas cond-mat.str-el cond-mat.supr-con

Comments: 27 pages, 8 figures Second version with small modifications in

section 7

Journal-ref: New J. Phys. 12, 055016 (2010)

DOI: 10.1088/1367-2630/12/5/055016

\\ ( http://arxiv.org/abs/0911.0875 , 2649kb)

------------------------------------------------------------------------------

\\

arXiv:1005.2420

replaced with revised version Wed, 2 Jun 2010 16:01:05 GMT (353kb)

Title: Comment on "Inequivalence between the Schrodinger equation and the

Madelung hydrodynamic equations"

Authors: Vel Hushwater

Categories: quant-ph

Comments: The paper was shortened and streamlined

\\ ( http://arxiv.org/abs/1005.2420 , 353kb)

------------------------------------------------------------------------------

\\

arXiv:1006.0198

replaced with revised version Wed, 2 Jun 2010 19:31:49 GMT (1196kb)

Title: An eccentrically perturbed Tonks-Girardeau gas

Authors: J. Goold, M. Krych, Z. Idziaszek, T. Fogarty and Th. Busch

Categories: cond-mat.quant-gas quant-ph

Comments: Comments and suggestions are welcome

\\ ( http://arxiv.org/abs/1006.0198 , 1196kb)

------------------------------------------------------------------------------

\\

arXiv:0911.5633

replaced with revised version Wed, 2 Jun 2010 08:30:21 GMT (210kb,D)

Title: Dynamics and stability of Bose-Einstein solitons in tilted optical

lattices

Authors: E. Diaz, C. Gaul, R. P. A. Lima, F. Dominguez-Adame, C. A. Mueller

Categories: cond-mat.quant-gas

Comments: final, published version

Journal-ref: Phys. Rev. A 81 051607(R) (2010)

DOI: 10.1103/PhysRevA.81.051607

\\ ( http://arxiv.org/abs/0911.5633 , 210kb)

------------------------------------------------------------------------------

\\

arXiv:0912.1254

replaced with revised version Wed, 2 Jun 2010 18:05:34 GMT (866kb,D)

Title: Collinear Four-Wave Mixing of Two-Component Matter Waves

Authors: Daniel Pertot, Bryce Gadway, and Dominik Schneble

Categories: cond-mat.quant-gas

Comments: 4 pages, 4 figures; revised version, essentially as published

Journal-ref: Phys. Rev. Lett. 104, 200402 (2010)

DOI: 10.1103/PhysRevLett.104.200402

\\ ( http://arxiv.org/abs/0912.1254 , 866kb)

------------------------------------------------------------------------------

\\

arXiv:0910.5055

replaced with revised version Tue, 1 Jun 2010 18:13:42 GMT (239kb)

Title: An Efficient Algorithm for approximating 1D Ground States

Authors: Dorit Aharonov, Itai Arad, Sandy Irani

Categories: quant-ph

Comments: 36 pages, 11 figures

\\ ( http://arxiv.org/abs/0910.5055 , 239kb)

------------------------------------------------------------------------------

\\

arXiv:1002.0219

replaced with revised version Tue, 1 Jun 2010 17:03:24 GMT (3253kb,D)

Title: Engineering Time-Reversal Invariant Topological Insulators With

Ultra-Cold Atoms

Authors: N. Goldman, I. Satija, P. Nikolic, A. Bermudez, M.A. Martin-Delgado,

M. Lewenstein and I. B. Spielman

Categories: cond-mat.quant-gas cond-mat.mes-hall quant-ph

Comments: 11 pages, 6 figures

\\ ( http://arxiv.org/abs/1002.0219 , 3253kb)

------------------------------------------------------------------------------

\\

arXiv:0811.1650

replaced with revised version Tue, 1 Jun 2010 06:25:55 GMT (1094kb)

Title: Elongated Fermi superfluid: absence of critical imbalance enhancement at

equilibrium

Authors: Masaki Tezuka, Youichi Yanase, Masahito Ueda

Categories: cond-mat.other cond-mat.quant-gas

Comments: v3: minor revision and clarification of v2. 4 pages, 4 figures

\\ ( http://arxiv.org/abs/0811.1650 , 1094kb)

------------------------------------------------------------------------------

\\

arXiv:1005.4027

replaced with revised version Tue, 1 Jun 2010 13:14:13 GMT (637kb)

Title: Bose-Einstein supersolid phase for a novel type of momentum dependent

interaction

Authors: Xiaopeng Li and W. Vincent Liu and Chungwei Lin

Categories: cond-mat.quant-gas cond-mat.other cond-mat.supr-con

Comments: 4 pages 3 figures, references added

\\ ( http://arxiv.org/abs/1005.4027 , 637kb)

------------------------------------------------------------------------------

\\

arXiv:1005.2751

replaced with revised version Sun, 30 May 2010 08:23:41 GMT (4kb)

Title: Finite Temperature Schr\"odinger Equation

Authors: Xiang-Yao Wu, Xiao-Jing Liu, Bai-Jun Zhang, Yi-Heng Wu, Qing-Cai Wang,

Yan Wang and Jing-Wu Li

Categories: physics.gen-ph quant-ph

\\ ( http://arxiv.org/abs/1005.2751 , 4kb)

------------------------------------------------------------------------------

\\

arXiv:1002.0453

replaced with revised version Mon, 31 May 2010 06:46:30 GMT (1405kb)

Title: A finite element method with mesh adaptivity for computing vortex states

in fast-rotating Bose-Einstein condensates

Authors: Ionut Danaila (LJLL), Frederic Hecht (LJLL)

Categories: cond-mat.quant-gas math.NA physics.comp-ph

Comments: to appear in J. Computational Physics

\\ ( http://arxiv.org/abs/1002.0453 , 1405kb)

------------------------------------------------------------------------------

\\

arXiv:0912.3261

replaced with revised version Mon, 31 May 2010 12:15:09 GMT (1227kb,D)

Title: The Dicke Quantum Phase Transition with a Superfluid Gas in an Optical

Cavity

Authors: Kristian Baumann, Christine Guerlin, Ferdinand Brennecke and Tilman

Esslinger

Categories: quant-ph cond-mat.quant-gas

Comments: 10 pages, 5 figures, updated version

Journal-ref: Nature 464, 1301 (2010)

DOI: 10.1038/nature09009

\\ ( http://arxiv.org/abs/0912.3261 , 1227kb)

------------------------------------------------------------------------------

\\

arXiv:1005.3015

replaced with revised version Mon, 31 May 2010 14:22:06 GMT (12kb)

Title: Local phase invariance of the free-particle Schrodinger equation in

momentum space

Authors: Boyan Obreshkov

Categories: quant-ph

Comments: submitted to J. Phys. A

\\ ( http://arxiv.org/abs/1005.3015 , 12kb)

------------------------------------------------------------------------------

\\

arXiv:1005.5224

replaced with revised version Mon, 31 May 2010 03:44:03 GMT (179kb)

Title: Quantum decoherence in a hybrid atom-optical system of a one-dimensional

coupled-resonator waveguide and an atom

Authors: Jing Lu, Lan Zhou, H. C. Fu, Le-Man Kuang

Categories: quant-ph

Comments: 7 pages, 3 figures, to appear in Phys. Rev. A

\\ ( http://arxiv.org/abs/1005.5224 , 179kb)

------------------------------------------------------------------------------

\\

arXiv:0911.0747

replaced with revised version Mon, 31 May 2010 09:13:38 GMT (1439kb)

Title: Exploring the Thermodynamics of a Universal Fermi Gas

Authors: Sylvain Nascimb\`ene (LKB - Lhomond), Nir Navon (LKB - Lhomond),

Kaijun Jiang (LKB - Lhomond), Fr\'ed\'eric Chevy (LKB - Lhomond), Christophe

Salomon (LKB - Lhomond)

Categories: cond-mat.quant-gas cond-mat.stat-mech physics.gen-ph

Comments: 8 pages, 5 figures

Journal-ref: Nature 463 (2010) 1057

DOI: 10.1038/nature08814

\\ ( http://arxiv.org/abs/0911.0747 , 1439kb)

------------------------------------------------------------------------------

\\

arXiv:0911.1302

replaced with revised version Sun, 30 May 2010 16:51:35 GMT (152kb)

Title: Sudden interaction quench in the quantum sine-Gordon model

Authors: J. Sabio, S. Kehrein

Categories: cond-mat.quant-gas cond-mat.stat-mech

Comments: 18 pages, 4 figures, published in New Journal of Physics

Journal-ref: 2010 New J. Phys. 12 055008

DOI: 10.1088/1367-2630/12/5/055008

\\ ( http://arxiv.org/abs/0911.1302 , 152kb)

------------------------------------------------------------------------------

\\

arXiv:0911.3129

replaced with revised version Mon, 31 May 2010 06:46:03 GMT (839kb)

Title: A new Sobolev gradient method for direct minimization of the

Gross-Pitaevskii energy with rotation

Authors: Ionut Danaila (LJLL), Parimah Kazemi (LJLL)

Categories: cond-mat.quant-gas math.NA

Comments: to appear in SIAM J Sci Computing

\\ ( http://arxiv.org/abs/0911.3129 , 839kb)

------------------------------------------------------------------------------

\\

arXiv:0912.2569

replaced with revised version Fri, 28 May 2010 23:23:54 GMT (189kb)

Title: Generalized formula for the Landau-Zener transition in interacting

Bose-Einstein condensates

Authors: A.M. Ishkhanyan

Categories: cond-mat.quant-gas cond-mat.other

Journal-ref: Eur. Phys. Lett. 90, 30007 (2010)

DOI: 10.1209/0295-5075/90/30007

\\ ( http://arxiv.org/abs/0912.2569 , 189kb)

------------------------------------------------------------------------------

\\

arXiv:1001.0846

replaced with revised version Sun, 30 May 2010 15:08:07 GMT (738kb,D)

Title: Selective photoexcitation of exciton-polariton vortices

Authors: Ga\"el Nardin, Konstantinos G. Lagoudakis, Barbara Pietka,

Fran\c{c}ois Morier-Genoud, Yoan L\'eger, Beno\^it Deveaud-Pl\'edran

Categories: cond-mat.quant-gas

\\ ( http://arxiv.org/abs/1001.0846 , 738kb)

------------------------------------------------------------------------------

\\

arXiv:1002.0453

replaced with revised version Mon, 31 May 2010 06:46:30 GMT (1405kb)

Title: A finite element method with mesh adaptivity for computing vortex states

in fast-rotating Bose-Einstein condensates

Authors: Ionut Danaila (LJLL), Frederic Hecht (LJLL)

Categories: cond-mat.quant-gas math.NA physics.comp-ph

Comments: to appear in J. Computational Physics

\\ ( http://arxiv.org/abs/1002.0453 , 1405kb)

------------------------------------------------------------------------------

\\

arXiv:1002.1242

replaced with revised version Mon, 31 May 2010 08:51:52 GMT (137kb)

Title: Quasi-one- and quasi-two-dimensional perfect Bose gas: the second

critical density and generalised condensation

Authors: Mathieu Beau (CPT), Valentin A. Zagrebnov (CPT)

Categories: cond-mat.quant-gas cond-mat.stat-mech

Comments: 6 p

\\ ( http://arxiv.org/abs/1002.1242 , 137kb)

------------------------------------------------------------------------------

\\

arXiv:1003.0765

replaced with revised version Sun, 30 May 2010 09:51:17 GMT (898kb)

Title: Spectral signatures of the BCS-BEC crossover in the excitonic insulator

phase of the extended Falicov-Kimball model

Authors: Nham Van Phan, Klaus W. Becker, and Holger Fehske

Categories: cond-mat.str-el

Comments: final version, minor corrections in the text, references updated

Journal-ref: Phys. Rev. B 81, 205117 (2010)

\\ ( http://arxiv.org/abs/1003.0765 , 898kb)

------------------------------------------------------------------------------

\\

arXiv:1005.3789

replaced with revised version Mon, 31 May 2010 15:34:11 GMT (2959kb)

Title: Dynamics of Dark-Bright Solitons in Cigar-Shaped Bose-Einstein

Condensates

Authors: S. Middelkamp, J.J. Chang, C. Hamner, R. Carretero-Gonzalez, P.G.

Kevrekidis, V. Achilleos, D.J. Frantzeskakis, P. Schmelcher, P. Engels

Categories: cond-mat.quant-gas nlin.PS

Comments: 4 pages, 5 figures

\\ ( http://arxiv.org/abs/1005.3789 , 2959kb)

------------------------------------------------------------------------------

\\

arXiv:1005.5212

replaced with revised version Mon, 31 May 2010 11:28:35 GMT (1225kb)

Title: Heating and Cooling in Adiabatic Mixing process

Authors: Jing Zhou, Zi Cai, Xu-Bo Zou, and Guang-Can Guo

Categories: cond-mat.quant-gas

Comments: 5 pages, 5 figures

\\ ( http://arxiv.org/abs/1005.5212 , 1225kb)

------------------------------------------------------------------------------

\\

arXiv:1003.5925

replaced with revised version Fri, 28 May 2010 14:39:47 GMT (487kb)

Title: Spin self-rephasing and very long coherence times in a trapped atomic

ensemble

Authors: Christian Deutsch, Fernando Ramirez-Martinez, Clement Lacro\^ute,

Friedemann Reinhard, Tobias Schneider, Jean-No\"el Fuchs, Fr\'ed\'eric

Pi\'echon, Franck Lalo\"e, Jakob Reichel and Peter Rosenbusch

Categories: quant-ph physics.atom-ph

Comments: Revised version; improved description of the theoretical treatment

\\ ( http://arxiv.org/abs/1003.5925 , 487kb)

------------------------------------------------------------------------------

\\

arXiv:0912.2402

replaced with revised version Fri, 28 May 2010 04:36:21 GMT (1164kb)

Title: Continuous-variables entanglement purification with atomic systems

Authors: Stojan Rebic, Stefano Mancini, Giovanna Morigi and David Vitali

Categories: quant-ph

Comments: Published in Feature Issue "Quantum Optical Information Technologies"

Journal-ref: J. Opt. Soc. Am. B 27, A198 (2010)

\\ ( http://arxiv.org/abs/0912.2402 , 1164kb)

------------------------------------------------------------------------------

\\

arXiv:1005.3584

replaced with revised version Fri, 28 May 2010 10:11:32 GMT (387kb)

Title: Quantum State Engineering using Single Nuclear Spin Qubit of Optically

Manipulated Ytterbium Atom

Authors: Atsushi Noguchi, Yujiro Eto, Masahito Ueda and Mikio Kozuma

Categories: quant-ph

Comments: 4 figures

\\ ( http://arxiv.org/abs/1005.3584 , 387kb)

------------------------------------------------------------------------------

\\

arXiv:1005.2403

replaced with revised version Thu, 27 May 2010 20:41:18 GMT (477kb,D)

Title: A superfluid-droplet crystal and a free-space supersolid in a

dipole-blockaded gas

Authors: F. Cinti, P. Jain, M. Boninsegni, A. Micheli, P. Zoller, and G.

Pupillo

Categories: cond-mat.quant-gas cond-mat.stat-mech

Comments: 4 pages, 4 figures

\\ ( http://arxiv.org/abs/1005.2403 , 477kb)

------------------------------------------------------------------------------

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/ ========================================================================= 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 ========================================================================= _______________________________________________ Matts-arxiv mailing list Matts-arxiv_at_lists.sps.uq.edu.auReceived on Wed Aug 04 2010 - 09:33:52 EST

*
This archive was generated by hypermail 2.2.0
: Wed Sep 01 2010 - 11:01:48 EST
*