Dear subscribers,
This week's mailing was compiled by Mike Garrett, and there were 36 new
preprints and 32 replacements
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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)
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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)
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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)
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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)
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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)
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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)
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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)
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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)
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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)
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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)
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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)
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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)
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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)
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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)
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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)
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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)
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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)
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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)
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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)
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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)
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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)
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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)
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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)
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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)
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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)
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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)
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\\
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)
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\\
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)
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\\
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)
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\\
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)
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\\
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)
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\\
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)
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\\
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)
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\\
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)
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\\
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)
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\\
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)
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\\
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)
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\\
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/
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