# [Matts-arxiv] Matt's arXiv selection: week ending 2 October 2009

From: Matthew Davis <mdavis_at_physics.uq.edu.au>
Date: Thu, 12 Nov 2009 08:50:41 +1000

Dear subscribers,

Before I get onto this week's abstracts, I would like to advertise an two
postdoctoral positions (one experimental, one theoretical) in ultra-cold gases
on offer at the University of Queensland, Brisbane, Australia.

Position description: http://www.uq.edu.au/jobs/2009documents/Sciences/3021260.doc

Please pass this message around to any interested colleagues. The closing date
has been extended to 27 November 2009.

And onto this week's abstracts. This week's selection was compiled using some
software developed by Chao Feng to try and speed up the filtering. It contains
50 new abstracts and 17 replacements.

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arXiv:0909.2621
Date: Mon, 14 Sep 2009 19:03:16 GMT (1011kb)

Title: Quantum and thermal effects in dark soliton formation and dynamics in a
1D Bose gas
Authors: A. D. Martin, J. Ruostekoski
Categories: cond-mat.quant-gas quant-ph
Comments: 4 pages, 3 figures
\\
We numerically study the imprinting and subsequent quantum dynamics of dark
solitons in a bosonic atomic gas in a tightly-confined one-dimensional harmonic
trap both with and without an additional optical lattice. Quantum and thermal
fluctuations of the atoms are included within the truncated Wigner
approximation by synthesizing the quantum statistics according to the
quasi-condensate description. We numerically track the coordinates of the
soliton trajectories and calculate quantum mechanical position and velocity
uncertainties for the soliton. We find them to be sensitive to the resulting
enhanced phase fluctuations that considerably {\em lower} the classically
predicted speed of the soliton in the absence of a lattice. In a lattice the
fluctuations seed the dynamical instabilities of the corresponding classical
system and even weak fluctuations may completely dominate the soliton dynamics.
Individual realizations show interactions of solitons with sound waves,
splitting and disappearing solitons.
\\ ( http://arxiv.org/abs/0909.2621 , 1011kb)
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arXiv:0909.4394
Date: Thu, 24 Sep 2009 09:16:11 GMT (46kb)

Title: Quantum heat engines and nonequilibrium temperature
Authors: Ramandeep S. Johal
Categories: quant-ph cond-mat.stat-mech
Comments: Five pages, Accepted for publication in Physical Review E
\\
A pair of two-level systems initially prepared in different thermal states
and coupled to an external reversible work source, do not in general reach a
common temperature at the end of a unitary work extraction process. We define
an effective temperature for the final nonequilibrium but passive state of the
bipartite quantum system and analyse its properties.
\\ ( http://arxiv.org/abs/0909.4394 , 46kb)
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arXiv:0909.4556
Date: Fri, 25 Sep 2009 01:28:18 GMT (57kb)

Title: Comment on "Quenches in quantum many-body systems: One-dimensional
Bose-Hubbard model reexamined" [arXiv:0810.3720]
Authors: Marcos Rigol
Categories: cond-mat.stat-mech cond-mat.quant-gas
Comments: 1 page, 1 figure
\\
In a recent paper Roux [Phys. Rev. A 79, 021608(R) (2009), arXiv:0810.3720]
argued that thermalization in a Bose-Hubbard system, after a quench, follows
from the approximate Boltzmann distribution of the overlap between the initial
state and the eigenstates of the final Hamiltonian. We show here that the
distribution of the overlaps is in general not related to the canonical (or
microcanonical) distribution and, hence, it cannot explain why thermalization
occurs in quantum systems.
\\ ( http://arxiv.org/abs/0909.4556 , 57kb)
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arXiv:0909.4593
Date: Fri, 25 Sep 2009 19:51:01 GMT (95kb)

Title: Phase diagram of the disordered Bose-Hubbard model
Authors: V. Gurarie, L. Pollet, N. V. Prokof'ev, B. V. Svistunov and M. Troyer
Categories: cond-mat.dis-nn
Comments: 9 pages, 5 figures
\\
We establish the phase diagram of the disordered three-dimensional
Bose-Hubbard model at unity filling, which has been controversial for many
years. The theorem of inclusions, proven in Ref. [1], states that the Bose
glass phase always intervenes between the Mott insulating and superfluid
phases. Here, we note that assumptions on which the theorem is based exclude
phase transitions between gapped (Mott insulator) and gapless phases (Bose
glass). The apparent paradox is resolved through a unique mechanism: such
transitions have to be of the Griffiths type when the vanishing of the gap at
the critical point is due to a zero concentration of rare regions where extreme
fluctuations of disorder mimic a {\it regular} gapless system. An exactly
solvable random transverse field Ising model in one dimension is used to
illustrate the point. A highly non-trivial overall shape of the phase diagram
is revealed with the worm algorithm. The phase diagram features a long
superfluid finger at strong disorder and on-site interaction. Moreover, bosonic
superfluidity is extremely robust against disorder in a broad range of
interaction parameters; it persists in random potentials nearly 50 (!) times
larger than the particle half-bandwidth. Finally, we comment on the feasibility
of obtaining this phase diagram in cold-atom experiments, which work with
trapped systems at finite temperature.
\\ ( http://arxiv.org/abs/0909.4593 , 95kb)
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arXiv:0909.4620
Date: Fri, 25 Sep 2009 06:43:41 GMT (586kb)

Title: Finite size effects in global quantum quenches: examples from free
bosons in an harmonic trap and the one-dimensional Bose-Hubbard model
Authors: Guillaume Roux
Categories: cond-mat.quant-gas cond-mat.str-el
Comments: 13 pages, 13 figures
\\
We investigate finite size effects in quantum quenches on the basis of simple
energetic arguments. Distinguishing between the low-energy part of the
excitation spectrum, below a microscopic energy-scale, and the high-energy
regime enables one to define a crossover number of particles that is shown to
diverge in the small quench limit. Another crossover number is proposed based
on the fidelity between the initial and final ground-states. Both criteria can
be computed using ground-state techniques that work for larger system sizes
than full spectrum diagonalization. As examples, two models are studied: one
with free bosons in an harmonic trap which frequency is quenched, and the
one-dimensional Bose-Hubbard model, that is known to be non-integrable and for
which recent studies have uncovered remarkable non-equilibrium behaviors. The
diagonal weights of the time-averaged density-matrix are computed and
observables obtained from this diagonal ensemble are compared with the ones
from statistical ensembles. It is argued that the thermalized'' regime of the
Bose-Hubbard model, previously observed in the small quench regime, experiences
strong finite size effects that render difficult a thorough comparison with
statistical ensembles. In addition, we show that the non-thermalized regime,
emerging on finite size systems and for large interaction quenches, is not
related to the existence of an equilibrium quantum critical point but to the
high energy structure of the energy spectrum in the atomic limit. Its features
are reminiscent of the quench from the non-interacting limit to the atomic
limit.
\\ ( http://arxiv.org/abs/0909.4620 , 586kb)
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arXiv:0909.4633
Date: Fri, 25 Sep 2009 08:21:09 GMT (86kb)

Title: Microwave Control of Low-Energy Atomic Collisions
Authors: D.J. Papoular, G.V. Shlyapnikov, J. Dalibard
Categories: cond-mat.quant-gas
Comments: 4 pages, 2 figures
\\
We investigate the possibility to control the s-wave scattering length for
the interaction between cold bosonic atoms by using a microwave field. Our
scheme applies to any atomic species with a ground state that is split by
hyperfine interaction. We discuss more specifically the case of alkali atoms
and calculate the change in the scattering length for 7Li, 23Na, and 87Rb. Our
results yield optimistic prospects for experiments with at least the two latter
species.
\\ ( http://arxiv.org/abs/0909.4633 , 86kb)
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arXiv:0909.4644
Date: Fri, 25 Sep 2009 09:14:07 GMT (1053kb)

Title: Ultra cold atoms and Bose-Einstein condensation for quantum metrology
Authors: H\'el\ene Perrin (LPL)
Categories: cond-mat.quant-gas
Comments: Review paper in the EPJST volume "Quantum Metrology and Fundamental
Constants", 13 pages
Journal-ref: European Journal of Physics Special Topics 172 (2009) 37
DOI: 10.1140/epjst/e2009-01040-8
\\
This paper is a short introduction to cold atom physics and Bose-Einstein
condensation. Light forces on atoms are presented, together with laser cooling,
and a few atom traps: the magneto-optical trap, dipole traps and magnetic
traps. A brief description of Bose-Einstein condensation is given together with
some important links with condensed matter physics. The reader is referred to
comprehensive reviews and to other lecture notes for further details on atom
cooling, trapping and Bose-Einstein condensation.
\\ ( http://arxiv.org/abs/0909.4644 , 1053kb)
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arXiv:0909.4649
Date: Fri, 25 Sep 2009 09:37:00 GMT (61kb)

Title: Conditions for Efimov Physics for Finite Range Potentials
Authors: M. Th{\o}gersen, D.V. Fedorov, A.S. Jensen, B.D. Esry, and Yujun Wang
Categories: quant-ph cond-mat.quant-gas nucl-th
Comments: 4 pages, 2 figures
Journal-ref: Phys. Rev. A 80, 013608 (2009)
DOI: 10.1103/PhysRevA.80.013608
\\
We consider a system of three identical bosons near a Feshbach resonance in
the universal regime with large scattering length usually described by model
independent zero-range potentials. We employ the adiabatic hyperspherical
approximation and derive the rigorous large-distance equation for the adiabatic
potential for finite-range interactions. The effective range correction to the
zero-range approximation must be supplemented by a new term of the same order.
The non-adiabatic term can be decisive. Efimov physics is always confined to
the range between effective range and scattering length. The analytical results
agree with numerical calculations for realistic potentials.
\\ ( http://arxiv.org/abs/0909.4649 , 61kb)
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arXiv:0909.4700
Date: Fri, 25 Sep 2009 13:38:35 GMT (2478kb,D)

Title: Quantum gas of rovibronic ground-state molecules in an optical lattice
Authors: Johann G. Danzl (1), Manfred J. Mark (1), Elmar Haller (1), Mattias
Gustavsson (1), Russell Hart (1), Jesus Aldegunde (2), Jeremy M. Hutson (2),
Hanns-Christoph Naegerl (1) ((1) Institut fuer Experimentalphysik und Zentrum
fuer Quantenphysik, Universitaet Innsbruck, (2) Department of Chemistry,
University of Durham)
Categories: cond-mat.quant-gas
\\
Control over all internal and external degrees of freedom of molecules at the
level of single quantum states will enable a series of fundamental studies in
physics and chemistry. In particular, samples of ground-state molecules at
ultralow temperatures and high number densities will allow novel quantum-gas
studies and future applications in quantum information science. However, high
phase-space densities for molecular samples are not readily attainable as
efficient cooling techniques such as laser cooling are lacking. Here we produce
an ultracold and dense sample of molecules in a single hyperfine level of the
rovibronic ground state with each molecule individually trapped in the motional
ground state of an optical lattice well. Starting from a zero-temperature
atomic Mott-insulator state with optimized double-site occupancy, weakly-bound
dimer molecules are efficiently associated on a Feshbach resonance and
subsequently transferred to the rovibronic ground state by a stimulated
four-photon process with >50 % efficiency. The molecules are trapped in the
lattice and have a lifetime of 8 s. Our results present a crucial step towards
Bose-Einstein condensation of ground-state molecules and, when suitably
generalized to polar heteronuclear molecules, the realization of dipolar
quantum-gas phases in optical lattices.
\\ ( http://arxiv.org/abs/0909.4700 , 2478kb)
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arXiv:0909.4755
Date: Fri, 25 Sep 2009 17:47:55 GMT (252kb)

Title: Interaction Dependence Thermodynamical parameters of Harmonically
Trapped Bose gas
Authors: Ahmed S. Hassan, Shemi S. M. Soliman, and Emad H. Soliman
Categories: cond-mat.stat-mech
\\
In this paper the thermodynamical parameters of a condensed Boson gas are
calculated from the partial derivative of the grand potential. In particular,
the analytical expressions for some important parameters, such as the condensed
fraction, specific heat, critical temperature, effective size, and release
energy are investigated. The mean effects which can be altered the ideal Bose
gas, such as finite size, highly anisotropic of the external potential and
interatomic interaction effects are considered simultaneously. Some new
characteristics of the trapped interacting Bose gases in a highly anisotropic
trap are revealed. The calculated result for the condensed fraction is compared
with the ongoing Stuttgart experiment for 52Cr (Griesmaier et al., Phys. Rev.
Lett. 94, 160401(2005)) directly. Good agreement between both the theoretical
and experimental data are obtained.
\\ ( http://arxiv.org/abs/0909.4755 , 252kb)
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arXiv:0909.4777
Date: Fri, 25 Sep 2009 19:17:18 GMT (7192kb)

Title: Quantum information with Rydberg atoms
Authors: M. Saffman and T. G. Walker and K. Molmer
Categories: quant-ph physics.atom-ph
Comments: submitted to Rev. Mod. Phys., 39 figures
\\
Rydberg atoms with principal quantum number n >> 1 have exaggerated atomic
properties including dipole-dipole interactions that scale as n^4 and radiative
lifetimes that scale as n^3. It was proposed a decade ago to take advantage of
these properties to implement quantum gates between neutral atom qubits. The
availability of a strong, long-range interaction that can be coherently turned
on and off is an enabling resource for a wide range of quantum information
tasks stretching far beyond the original gate proposal. Rydberg enabled
capabilities include long-range two-qubit gates, collective encoding of
multi-qubit registers, implementation of robust light-atom quantum interfaces,
and the potential for simulating quantum many body physics. We review the
advances of the last decade, covering both theoretical and experimental aspects
of Rydberg mediated quantum information processing.
\\ ( http://arxiv.org/abs/0909.4777 , 7192kb)
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arXiv:0909.4822
Date: Sat, 26 Sep 2009 01:20:22 GMT (1291kb)

Title: Quantum Phase Transitions in Spin-Boson Systems: Dissipation and Light
Phenomena
Authors: Karyn Le Hur
Categories: cond-mat.other
Comments: 2+26 pages, Chapter in the book on Developments in Quantum Phase
Transitions, ed. L. D. Carr/CRC Press, Taylor & Francis
\\
Spin-boson models are essentially useful in the understanding of quantum
optics, nuclear physics, quantum dissipation, and quantum computation. We
discuss quantum phase transitions in various spin-boson Hamiltonians, compare,
and contrast them. We summarize the theoretical concepts and results, open
questions and implementations of those ideas in cold atomic and QED cavity
systems are also addressed.
\\ ( http://arxiv.org/abs/0909.4822 , 1291kb)
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arXiv:0909.4917
Date: Sun, 27 Sep 2009 04:58:24 GMT (202kb)

Title: Correlated vs Ferromagnetic State in Repulsively Interacting
Two-Component Fermi Gases
Authors: Hui Zhai
Categories: cond-mat.quant-gas cond-mat.str-el
Comments: 4 pages, 2 figures
\\
Whether a spin-1/2 Fermi gas will become ferromagnetic as the strength of
repulsive interaction increases is a long-standing controversial issue.
Recently this problem is studied experimentally by Jo et al, Science, 325, 1521
(2009) in which the authors claim a ferromagnetic transition is observed. This
work is to point out the results of this experiment can not distinguish whether
the system is in a ferromagnetic state or in a non-magnetic but strongly
short-range correlated state. A conclusive experimental demonstration of
ferromagnetism relies on the observation of ferromagnetic domains.
\\ ( http://arxiv.org/abs/0909.4917 , 202kb)
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arXiv:0909.4932
Date: Sun, 27 Sep 2009 12:47:29 GMT (33kb)

Title: Dynamics of finite Fermi-Hubbard and Bose-Hubbard systems
Authors: K. Ziegler
Categories: cond-mat.quant-gas
Comments: 12 pages, 5 figures
\\
This paper analyzes dynamical properties of small Fermi-Hubbard and
Bose-Hubbard systems, focusing on the structure of the underlying Hilbert
space. We evaluate time-dependent quantities such as the return probability to
the initial state and the spin imbalance of spin-1/2 fermions. The results are
compared with recent experimental observations in ultracold gases. For the
symmetric two-site Fermi-Hubbard model we find that the spin imbalance and the
return probability are controlled by two and three frequencies, respectively.
The spin imbalance and the return probability are identical for the asymmetric
Falicov-Kimball limit and controlled by only one frequency. In general, the
transition probabilities between the initial state and energy eigenstates
depend strongly on the particle-particle interaction. This is discussed for
"self trapping" of spinless bosons in a double-well potential. We observe that
the available Hilbert space is reduced significantly by strong interaction.
\\ ( http://arxiv.org/abs/0909.4932 , 33kb)
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arXiv:0909.4990
Date: Mon, 28 Sep 2009 08:51:33 GMT (9kb)

Title: Entangled Superfluids
Authors: Yu Shi
Categories: cond-mat.quant-gas
\\
We study dynamics of the so-called entangled Bose-Einstein condensation
(EBEC), which is the ground state of a peculiar mixture of two species of
pseudospin-1/2 atoms. EBEC leads to four inter-dependent superfluid components.
The four superflows have various counter relations, and altogether lead to a
conserved total supercurrent and a conserved total spin supercurrent. In the
homogenous case, we also obtain the elementary excitations by exactly solving
the generalized Bogoliubov equations. In addition to two Bogoliubov modes
depending on both intraspecies and interspecies interactions, and one
Bogoliubov mode due to interspecies interactions only, there is a gapped mode
due to interspecies interactions only.
\\ ( http://arxiv.org/abs/0909.4990 , 9kb)
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arXiv:0909.5081
Date: Mon, 28 Sep 2009 12:56:32 GMT (653kb)

Title: Nonlinear magneto-optical resonances at D1 excitation of 85Rb and 87Rb
in an extremely thin cell
Authors: M. Auzinsh (1), R. Ferber (1), F. Gahbauer (1), A. Jarmola (1), L.
Kalvans (1), A. Papoyan (2), D. Sarkisyan (2) ((1) Laser Centre, The
University of Latvia, Riga, Latvia, (2) Institute for Physical Research,
Ashtarak, Armenia)
Categories: physics.atom-ph
Comments: 12 pages, 10 figures
\\
Nonlinear magneto-optical resonances have been measured in an extremely thin
cell (ETC) for the D1 transition of rubidium in an atomic vapor of natural
isotopic composition. All hyperfine transitions of both isotopes have been
studied for a wide range of laser power densities, laser detunings, and ETC
wall separations. Dark resonances in the laser induced fluorescence (LIF) were
observed as expected when the ground state total angular momentum F_g was
greater than or equal to the excited state total angular momentum F_e. Unlike
the case of ordinary cells, the width and contrast of dark resonances formed in
the ETC dramatically depended on the detuning of the laser from the exact
atomic transition. A theoretical model based on the optical Bloch equations was
applied to calculate the shapes of the resonance curves. The model averaged
over the contributions from different atomic velocity groups, considered all
neighboring hyperfine transitions, took into account the splitting and mixing
of magnetic sublevels in an external magnetic field, and included a detailed
treatment of the coherence properties of the laser radiation. Such a
theoretical approach had successfully described nonlinear magneto-optical
resonances in ordinary vapor cells. Although the values of certain model
parameters in the ETC differed significantly from the case of ordinary cells,
the same physical processes were used to model both cases. However, to describe
the resonances in the ETC, key parameters such as the transit relaxation rate
and Doppler width had to be modified in accordance with the ETC's unique
features. Agreement between the measured and calculated resonance curves was
satisfactory for the ETC, though not as good as in the case of ordinary cells.
\\ ( http://arxiv.org/abs/0909.5081 , 653kb)
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arXiv:0909.5090
Date: Mon, 28 Sep 2009 13:23:25 GMT (648kb)

Title: Bose-Einstein condensation in dark power-law laser traps
Authors: Amine Jaouadi (PPM, LSAMA), Naceur Gaaloul (IQ), Mourad Telmini
(LSAMA), Bruno Viaris De Lesegno (LAC), Laurence Pruvost (LAC), Eric Charron
(PPM)
Categories: quant-ph
\\
We investigate theoretically the phase transition of interacting Bose gases
in shaped optical traps. One-, two- and three-dimensional power-law trapping
potentials are created using two crossing blue-detuned Laguerre-Gaussian laser
beams. Controlling their associated azimuthal order l allows for the
exploration of a multitude of power-law trapping situations ranging from the
harmonic trap to a quasi-homogeneous Bose gas. For an arbitrary condensate
occupation number and when compared to a harmonic trap of the same size, higher
transition temperatures can be obtained with larger values of l. This effect
results in a substantial acceleration of the condensation dynamics.
\\ ( http://arxiv.org/abs/0909.5090 , 648kb)
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arXiv:0909.5161
Date: Mon, 28 Sep 2009 18:12:15 GMT (1860kb,D)

Title: Topological phase transitions in the non-Abelian honeycomb lattice
Authors: A. Bermudez, N. Goldman, A. Kubasiak, M. Lewenstein, and M.A.
Categories: cond-mat.mes-hall
Comments: RevTex4 file, color figures
\\
Ultracold Fermi gases trapped in honeycomb optical lattices provide an
intriguing scenario, where relativistic quantum electrodynamics can be tested.
Here, we generalize this system to non-Abelian quantum electrodynamics, where
massless Dirac fermions interact with effective non-Abelian gauge fields. We
show how in this setup a variety of topological phase transitions occur, which
arise due to massless fermion pair production events, as well as pair
annihilation events of two kinds: spontaneous and strongly-interacting induced.
Moreover, such phase transitions can be controlled and characterized in optical
lattice experiments.
\\ ( http://arxiv.org/abs/0909.5161 , 1860kb)
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arXiv:0909.5181
Date: Mon, 28 Sep 2009 20:00:03 GMT (74kb,D)

Title: Quench dynamics near a quantum critical point
Authors: C. De Grandi, V. Gritsev, A. Polkovnikov
Categories: cond-mat.stat-mech
Comments: 4 pages, 1 figure
\\
We study the dynamical response of a system to a sudden small change of the
tuning parameter starting at the quantum critical point. In particular, we
analyze the scaling of the excitation probability with the quench amplitude. We
discuss a close connection of this scaling with the scaling behavior of the
fidelity, highlighting the link between non-equilibrium and equilibrium
properties of the system. We demonstrate that this connection extends to slow
quenches, where the tuning parameter linearly increases in time. We also
discuss the effect of a finite initial temperature on the scaling relations and
argue that those become sensitive to the statistics of the excited
quasi-particles.
\\ ( http://arxiv.org/abs/0909.5181 , 74kb)
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arXiv:0909.5267
Date: Tue, 29 Sep 2009 05:25:27 GMT (53kb)

Title: Liquid crystal phases of ultracold dipolar fermions on a lattice
Authors: Chungwei Lin, Erhai Zhao, and W. Vincent Liu
Categories: cond-mat.quant-gas
Comments: 7 pages, 4 figures
\\
Motivated by the search for quantum liquid crystal phases in a gas of
ultracold atoms and molecules, we study the density wave and nematic
instabilities of dipolar fermions on the two-dimensional square lattice (in the
$x-y$ plane) with dipoles pointing to the $z$ direction. We determine the phase
diagram using two complimentary methods, the Hartree-Fock mean field theory and
the linear response analysis of compressibility. Both give consistent results.
In addition to the staggered ($\pi$, $\pi$) density wave, over a finite range
of densities, the ground state of the system first becomes nematic and then
smectic, when the dipolar interaction strength is increased. Both phases are
characterized by the same broken C$_4$ rotational symmetry. The difference is
that the nematic phase has an open Fermi surface but the smectic does not. The
transition from the nematic to the smectic phase is associated with a jump in
the nematic order parameter. This jump is closely related to the van Hove
singularities. We derive the kinetic equation for collective excitations in the
normal isotropic phase and find that the zero sound mode is strongly Landau
damped and thus is not a well defined excitation. Experimental implications of
our results are discussed.
\\ ( http://arxiv.org/abs/0909.5267 , 53kb)
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arXiv:0909.5305
Date: Tue, 29 Sep 2009 10:38:29 GMT (770kb,D)

Title: Perfect imaging without negative refraction
Authors: Ulf Leonhardt
Categories: physics.optics
Journal-ref: New Journal of Physics 11, 093040 (2009)
DOI: 10.1088/1367-2630/11/9/093040
\\
Perfect imaging has been believed to rely on negative refraction, but here we
show that an ordinary positively-refracting optical medium may form perfect
images as well. In particular, we establish a mathematical proof that Maxwell's
fish eye in two-dimensional integrated optics makes a perfect instrument with a
resolution not limited by the wavelength of light. We also show how to modify
the fish eye such that perfect imaging devices can be made in practice. Our
method of perfect focusing may also find applications outside of optics, in
acoustics, fluid mechanics or quantum physics, wherever waves obey the
two-dimensional Helmholtz equation.
\\ ( http://arxiv.org/abs/0909.5305 , 770kb)
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arXiv:0909.5337
Date: Tue, 29 Sep 2009 13:29:55 GMT (17kb)

Title: Dissipation in composite quantum systems
Authors: Andreas Kurcz, Antonio Capolupo, Almut Beige, Emilio Del Giudice, and
Giuseppe Vitiello
Categories: cond-mat.other
Comments: 4 pages, 2 figures
\\
Dissipation in the form of spontaneous emission of photons from an optical
cavity and from individually trapped atoms has been studied extensively in the
framework of quantum optics. Up to now, theoretical predictions based on the
dipole and the rotating wave approximation (RWA) are in very good agreement
with experimental findings. However, current experiments aim at combining
better and better cavities with relatively large numbers of tightly confined
atoms within the same setup. Here we point out that the result might be a
behaviour which is profoundly different from the behaviour of individual
quantum systems and which cannot be described using the RWA. To show this, we
predict a non-zero stationary-state cavity photon emission rate even in the
absence of external driving. This rate and its dependence on the system
parameters could be verified experimentally.
\\ ( http://arxiv.org/abs/0909.5337 , 17kb)
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arXiv:0909.5380
Date: Tue, 29 Sep 2009 16:31:51 GMT (39kb)

Title: Mean-field equations for cigar- and disk-shaped Bose and Fermi
superfluids
Authors: Camilo A. G. Buitrago and S. K. Adhikari
Categories: cond-mat.quant-gas
\\
Starting from the three-dimensional (3D) time-dependent nonlinear
Gross-Pitaevskii equation for a Bose-Einstein condensate (BEC) and density
functional (DF) equation for a Fermi superfluid at the unitarity and
Bardeen-Cooper-Schrieffer (BCS) limits, we derive effective one- (1D) and
two-dimensional (2D) mean-field equations, respectively, for the dynamics of a
trapped cigar- and disk-shaped BEC and Fermi superfluid by using the adiabatic
approximation. The reduced 1D and 2D equations for a cigar- and disk-shaped
Fermi superfluid have simple analytic nonlinear terms and at unitarity produce
results for stationary properties and non-stationary breathing oscillation and
free expansion in excellent agreement with the solution of the full 3D
equation.
\\ ( http://arxiv.org/abs/0909.5380 , 39kb)
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arXiv:0909.5465
Date: Tue, 29 Sep 2009 22:51:25 GMT (650kb)

Title: Hamiltonian chaos in a coupled BEC -- optomechanical cavity system
Authors: K. Zhang, W. Chen, M. Bhattacharya, P. Meystre
Categories: quant-ph
\\
We study a hybrid optomechanical system consisting of a Bose-Einstein
condensate (BEC) trapped inside a single-mode optical cavity with a moving
end-mirror. The intracavity light field has a dual role: it excites a momentum
side-mode of the condensate, and acts as a nonlinear spring that couples the
vibrating mirror to that collective density excitation. We present the dynamics
in a regime where the intracavity optical field, the mirror, and the side-mode
excitation all display bistable behavior. In this regime we find that the
dynamics of the system exhibits Hamiltonian chaos for appropriate initial
conditions.
\\ ( http://arxiv.org/abs/0909.5465 , 650kb)
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arXiv:0909.5523
Date: Wed, 30 Sep 2009 06:35:05 GMT (162kb)

Title: Bose-Fermi mixture in one-dimensional optical lattices with hard-core
interactions
Authors: Xiaoming Cai, Liming Guan, Shu Chen, Yajiang Hao, Yupeng Wang
Categories: cond-mat.quant-gas cond-mat.str-el
Comments: 9 pages, 6 figures
\\
We study a mixture of $N_{b}$ bosons with point hard-core boson-boson
interactions and $N_{f}$ noninteracting spinless fermions with point hard-core
boson-fermion interactions in 1D optical lattice with external harmonic confine
potential. Using an extended Jordan-Winger transformation (JWT) which maps the
hard-core Bose-Fermi mixture into two component noninteracting spinless
fermions with hard-core interactions between them, we get the ground states of
the system. Then we determine in details the one particle density matrix,
density profile, momentum distribution, the natural orbitals and their
occupations based on the constructed ground state wavefunctions. We also
discuss the ground state properties of the system with large but finite
interactions which lead to the lift of ground degeneracy. Our results show
that, although the total density profile is almost not affected, the
distributions for bosons and fermions strongly depend on the relative
strengthes of boson-boson interactions and boson-fermion interactions.
\\ ( http://arxiv.org/abs/0909.5523 , 162kb)
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\\
arXiv:0909.5553
Date: Wed, 30 Sep 2009 09:31:24 GMT (12kb)

Title: Off-diagonal Long-Range Order and Supersolidity in a Quantum Solid with
Vacancies
Authors: Yu Shi, Yin Yang, Shao-Ming Fei
Categories: cond-mat.other
\\
We consider a lattice of bosonic atoms, whose number $N$ may be smaller than
the number of lattice sites $M$. We study the Hartree-Fock wave function built
up from localized wave functions $w(\mathbf{r})$ of single atoms, with nearest
neighboring overlap. The zero-momentum particle number is expressed in terms of
permanents of matrices. In one dimension, it is analytically calculated to be
\alpha*N(M-N+1)/M, with \alpha=|\int w(\mathbf{r})d\Omega|^2/[(1+2a)l], where a
is the nearest-neighboring overlap, l is the lattice constant. \alpha is of the
order of 1. The result indicates that the condensate fraction is proportional
to and of the same order of magnitude as that of the vacancy concentration,
hence there is off-diagonal long-range order or Bose-Einstein condensation of
atoms when the number of vacancies M-N is a finite fraction of the number of
the lattice sites M.
\\ ( http://arxiv.org/abs/0909.5553 , 12kb)
------------------------------------------------------------------------------
\\
arXiv:0909.5607
Date: Wed, 30 Sep 2009 13:25:36 GMT (122kb,D)

Title: Scattering laser light on cold atoms: multiple scattering signals from
single-atom responses
Authors: Thomas Wellens, Tobias Geiger, Vyacheslav Shatokhin, and Andreas
Buchleitner
Categories: quant-ph physics.atom-ph
Comments: 4 pages, 2 figures
\\
We deduce the coherent backscattering signal from two distant laser-driven
atoms using single-atom equations. In contrast to the standard master equation
treatment, this new approach is suitable for the generalization to a large
number of atomic scatterers.
\\ ( http://arxiv.org/abs/0909.5607 , 122kb)
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\\
arXiv:0909.5615
Date: Wed, 30 Sep 2009 14:06:16 GMT (19kb)

Title: Pionic BEC--BCS crossover at finite isospin chemical potential
Authors: Masayuki Matsuzaki (Fukuoka Univ. of Education)
Categories: hep-ph cond-mat.supr-con nucl-th
Comments: 12 pages, 3 figures
\\
We study the character change of the pionic condensation at finite isospin
chemical potential \mu_\mathrm{I} by adopting the linear sigma model as a
non-local interaction between quarks. At low |\mu_\mathrm{I}| the condensation
is purely bosonic, then the Cooper pairing around the Fermi surface grows
gradually as |\mu_\mathrm{I}| increases. This q-\bar q pairing is weakly
coupled in comparison with the case of the q-q pairing that leads to color
superconductivity.
\\ ( http://arxiv.org/abs/0909.5615 , 19kb)
------------------------------------------------------------------------------
\\
arXiv:0909.5620
Date: Wed, 30 Sep 2009 14:29:27 GMT (526kb,D)

Title: Low energy dynamics of spinor condensates
Authors: Austen Lamacraft
Categories: cond-mat.quant-gas
\\
We present a derivation of the low energy Lagrangian governing the dynamics
of the spin degrees of freedom in a spinor Bose condensate, for any phase in
which the average magnetization vanishes. This includes all phases found within
mean-field treatments except for the ferromagnet, for which the low energy
dynamics has been discussed previously. The Lagrangian takes the form of a
sigma model for the rotation matrix describing the local orientation of the
spin state of the gas.
\\ ( http://arxiv.org/abs/0909.5620 , 526kb)
------------------------------------------------------------------------------
\\
arXiv:0909.5635
Date: Tue, 29 Sep 2009 22:23:42 GMT (3782kb)

Title: Mesoscopic Effects in Quantum Phases of Ultracold Quantum Gases in
Optical Lattices
Authors: L. D. Carr, M. L. Wall, D. G. Schirmer, R. C. Brown, J. E. Williams,
and Charles W. Clark
Categories: cond-mat.quant-gas
Comments: 13 pages, 10 figures
\\
We present a wide array of quantum measures on numerical solutions of 1D
Bose- and Fermi-Hubbard Hamiltonians for finite-size systems with open boundary
conditions. Finite size effects are highly relevant to ultracold quantum gases
in optical lattices, where an external trap creates smaller effective regions
in the form of the celebrated "wedding cake" structure and the local density
approximation is often not applicable. Specifically, for the Bose-Hubbard
Hamiltonian we calculate number, quantum depletion, local von-Neumann entropy,
generalized entanglement or Q-measure, fidelity, and fidelity susceptibility;
for the Fermi-Hubbard Hamiltonian we also calculate the pairing correlations,
magnetization, charge-density correlations, and antiferromagnetic structure
factor. Our numerical method is imaginary time propagation via time-evolving
block decimation. As part of our study we provide a careful comparison of
canonical vs. grand canonical ensembles and Gutzwiller vs. entangled
simulations. The most striking effect of finite size occurs for bosons: we
observe a strong blurring of the tips of the Mott lobes accompanied by higher
depletion, and show how the location of the first Mott lobe tip approaches the
thermodynamic value as a function of system size.
\\ ( http://arxiv.org/abs/0909.5635 , 3782kb)
------------------------------------------------------------------------------
\\
arXiv:0910.0016
Date: Wed, 30 Sep 2009 20:13:03 GMT (1836kb)

Title: Long-distance entanglement in many-body atomic and optical systems
Authors: Salvatore M. Giampaolo, Fabrizio Illuminati
Categories: quant-ph
\\
We discuss the phenomenon of long-distance entanglement in the ground state
of quantum spin models, its use in high-fidelity and robust quantum
communication, and its realization in many-body systems of ultracold atoms in
optical lattices and in arrays of coupled optical cavities. We investigate
different patterns of site-dependent interaction couplings, singling out two
general settings: Patterns that allow for perfect long-distance entanglement
(LDE) in the ground state of the system, namely such that the end-to-end
entanglement remains finite in the thermodynamic limit, and patterns of quasi
long-distance entanglement (QLDE) in the ground state of the system, namely,
such such that the end-to-end entanglement vanishes with a very slow power-law
decay as the length of the spin chain is increased. We discuss physical
realizations of these models in ensembles of ultracold bosonic atoms loaded in
optical lattices. We show how, using either suitably engineered super-lattice
structures or exploiting the presence of edge impurities in lattices with
single periodicity, it is possible to realize models endowed with nonvanishing
LDE or QLDE. We then study how to realize models that optimize the robustness
of QLDE at finite temperature and in the presence of imperfections using
suitably engineered arrays of coupled optical cavities. We finally introduce
LDE-based schemes of long-distance quantum teleportation in linear arrays of
coupled cavities and show that they allow for high-fidelity and high success
rates even at moderately high temperatures.
\\ ( http://arxiv.org/abs/0910.0016 , 1836kb)
------------------------------------------------------------------------------
\\
arXiv:0910.0035
Date: Wed, 30 Sep 2009 21:08:46 GMT (32kb)

Title: Collapse of triaxial bright solitons in atomic Bose-Einstein condensates
Authors: G. Mazzarella and L. Salasnich
Categories: cond-mat.quant-gas
Comments: Accepted for the publication in Phys. Lett. A
\\
We study triaxial bright solitons made of attractive Bose-condensed atoms
characterized by the absence of confinement in the longitudinal axial direction
but trapped by an anisotropic harmonic potential in the transverse plane. By
numerically solving the three-dimensional Gross-Pitaevskii equation we
investigate the effect of the transverse trap anisotropy on the critical
interaction strength above which there is the collapse of the condensate. The
comparison with previous predictions [Phys. Rev. A {\bf 66}, 043619 (2002)]
shows significant differences for large anisotropies.
\\ ( http://arxiv.org/abs/0910.0035 , 32kb)
------------------------------------------------------------------------------
\\
arXiv:0910.0051
Date: Wed, 30 Sep 2009 23:17:36 GMT (45kb)

Title: Entanglement spectra of critical and near-critical systems in one
dimension
Authors: Frank Pollmann, Joel E. Moore
Categories: cond-mat.str-el
Comments: 6 pages, 5 figures
\\
The entanglement spectrum of a pure state of a bipartite system is the full
set of eigenvalues of the reduced density matrix obtained from tracing out one
part. Such spectra are known in several cases to contain important information
beyond that in the entanglement entropy. This paper studies the entanglement
spectrum for a variety of critical and near-critical quantum lattice models in
one dimension, chiefly by the iTEBD numerical method, which enables both
integrable and non-integrable models to be studied. We find that the
distribution of eigenvalues in the entanglement spectra agrees with an
approximate result derived by Calabrese and Lefevre to an accuracy of a few
percent for all models studied. This result applies whether the correlation
length is intrinsic or generated by the finite matrix size accessible in iTEBD.
For the transverse Ising model, the known exact results for the entanglement
spectrum are used to confirm the validity of the iTEBD approach. For more
general models, no exact result is available but the iTEBD results directly
test the hypothesis that all moments of the reduced density matrix are
determined by a single parameter.
\\ ( http://arxiv.org/abs/0910.0051 , 45kb)
------------------------------------------------------------------------------
\\
arXiv:0910.0052
Date: Wed, 30 Sep 2009 23:17:56 GMT (263kb)

Title: Stability of a Fully Polarized Ultracold Fermi Gas near Zero-Crossing of
a p-wave Feshbach Resonance
Authors: N. T. Zinner
Categories: cond-mat.quant-gas
Comments: 5 pages, 2 figures
\\
We consider a fully polarized ultracold Fermi gas interacting through a
p-wave Feshbach resonance. Using a two-channel model, we find the effective
potential at the point where the p-wave scattering length goes to zero. Here
the effective interaction provides attraction and one can therefore ask about
the stability of the system. We calculate the energy density of the system in
the Thomas-Fermi approximation, determine the profile of the gas, and the
critical number of particle in the system as function of the relevant
interaction parameters. The instability can be deduced from a simple breathing
mode argument which explains the scaling found numerically. The critical
particle number turns out to be extremely large unless the external confinement
is very tight. We therefore conclude that the effect is insignificant for
standard trapping potentials and that the magnetic dipole interaction is the
important term at zero scattering length. However, for tight confinement as in
an optical lattice higher-order corrections can become important.
\\ ( http://arxiv.org/abs/0910.0052 , 263kb)
------------------------------------------------------------------------------
\\
arXiv:0910.0074
Date: Thu, 1 Oct 2009 04:36:12 GMT (1045kb)

Title: Storage and Retrieval of Thermal Light in Warm Atomic Vapor
Authors: Young-Wook Cho and Yoon-Ho Kim
Categories: quant-ph
Comments: 4 pages, 4 figures
\\
We report slowed propagation and storage and retrieval of thermal light in
warm rubidium vapor using the effect of electromagnetically-induced
transparency (EIT). We first demonstrate slowed-propagation of the probe
thermal light beam through an EIT medium by measuring the second-order
correlation function of the light field using the Hanbury-Brown$-$Twiss
interferometer. We also report an experimental study on the effect of the EIT
slow-light medium on the temporal coherence of thermal light. Finally, we
demonstrate the storage and retrieval of thermal light beam in the EIT medium.
The direct measurement of the photon number statistics of the retrieved light
field shows that the photon number statistics is preserved during the storage
and retrieval process.
\\ ( http://arxiv.org/abs/0910.0074 , 1045kb)
------------------------------------------------------------------------------
\\
arXiv:0910.0082
Date: Thu, 1 Oct 2009 05:09:23 GMT (132kb)

Title: Finite-Size Scaling for Quantum Criticality above the Upper Critical
Dimension: Superfluid-Mott-Insulator Transition in Three Dimensions
Authors: Yasuyuki Kato, Naoki Kawashima
Categories: cond-mat.stat-mech
Comments: 18 pages, 4 figures
\\
Validity of modified finite-size scaling above the upper critical dimension
is demonstrated for the quantum phase transition whose dynamical critical
exponent is $z=2$. We consider the $N$-component Bose-Hubbard model, which is
exactly solvable and exhibits mean-field type critical phenomena in the
large-$N$ limit. The modified finite-size scaling holds exactly in that limit.
However, the usual procedure, taking the large system-size limit with fixed
temperature, does not lead to the expected (and correct) mean-field critical
behavior due to the limited range of applicability of the finite-size scaling
form. By quantum Monte Carlo simulation, it is shown that the same holds in the
case of N=1.
\\ ( http://arxiv.org/abs/0910.0082 , 132kb)
------------------------------------------------------------------------------
\\
arXiv:0910.0182
Date: Thu, 1 Oct 2009 17:56:59 GMT (28kb,D)

Title: A scalable Bose-Einstein condensate Sagnac interferometer in a linear
trap
Authors: J. H. T. Burke and C. A. Sackett
Categories: cond-mat.quant-gas
Comments: 4 pages, 2 figures
\\
We demonstrate a two-dimensional atom interferometer in a harmonic magnetic
waveguide using a Bose-Einstein condensate. Such an interferometer could
measure rotation using the Sagnac effect. Compared to free space
interferometers, larger interactions times and enclosed areas can in principle
be achieved, since the atoms are not in free fall. In this implementation, we
induce the atoms to oscillate along one direction by displacing the trap
center. We then split and recombine the atoms along an orthogonal direction,
using an off-resonant optical standing wave. We enclose a maximum effective
area of 0.1 square mm, limited by fluctuations in the initial velocity and the
coherence time of the interferometer. We argue that this arrangement is
scalable to enclose larger areas by increasing the coherence time and then
making repeated loops.
\\ ( http://arxiv.org/abs/0910.0182 , 28kb)
------------------------------------------------------------------------------
\\
arXiv:0910.0205
Date: Thu, 1 Oct 2009 15:47:53 GMT (70kb)

Title: Quantum vortex dynamics in a two-dimensional neutral superfluids
Authors: C.-C. Joseph Wang, R. A. Duine, A. H. MacDonald
Categories: cond-mat.quant-gas cond-mat.mes-hall
Comments: 14 pages, 10 figures, submit to PRA
\\
We derive an effective action for the vortex position degree-of-freedom in a
superfluid by integrating out condensate phase and density fluctuation
environmental modes. When the quantum dynamics of environmental fluctuations is
neglected, we confirm the occurrence of the vortex Magnus force and obtain an
expression for the vortex mass. We find that this adiabatic approximation is
valid only when the superfluid droplet radius $R$, or the typical distance
between vortices, is very much larger than the coherence length $\xi$. We go
beyond the adiabatic approximation numerically, accounting for the quantum
dynamics of environmental modes and capturing their dissipative coupling to
condensate dynamics. For the case of an optical-lattice superfluid we
demonstrate that vortex motion damping can be adjusted by tuning the ratio
between the tunneling energy $J$ and the on-site interaction energy $U$. We
comment on the possibility of realizing vortex Landau level physics.
\\ ( http://arxiv.org/abs/0910.0205 , 70kb)
------------------------------------------------------------------------------
\\
arXiv:0910.0242
Date: Thu, 1 Oct 2009 19:57:44 GMT (6kb)

Title: Communicating Science to the Media
Authors: Kathryn Grim
Categories: physics.pop-ph
Comments: To be published in the proceedings of DPF-2009, Detroit, MI, July
2009, eConf C090726
\\
It's impossible to anticipate everything a reporter will ask you, but this
media training will teach you how to prepare for interviews with print,
television or radio journalists and increase your understanding of how to
communicate effectively through the media.
\\ ( http://arxiv.org/abs/0910.0242 , 6kb)
------------------------------------------------------------------------------
\\
arXiv:0909.4555
Date: Thu, 24 Sep 2009 22:43:16 GMT (138kb,D)

Title: Soccer matches as experiments: how often does the 'best' team win?
Authors: G. K. Skinner and G. H. Freeman
Categories: physics.soc-ph physics.data-an
Comments: Contact the corresponding author in case of difficulty in accessing
the published paper
Journal-ref: Journal of Applied Statistics Vol. 36, No. 10, October 2009,
1087-1095
DOI: 10.1080/02664760802715922
\\
Models in which the number of goals scored by a team in a soccer match follow
a Poisson distribution, or a closely related one, have been widely discussed.
We here consider a soccer match as an experiment to assess which of two teams
is superior and examine the probability that the outcome of the experiment
(match) truly represents the relative abilities of the two teams. Given a final
score, it is possible by using a Bayesian approach to quantify the probability
that it was or was not the case that 'the best team won'. For typical scores,
the probability of a misleading result is significant. Modifying the rules of
the game to increase the typical number of goals scored would improve the
situation, but a level of confidence that would normally be regarded as
satisfactory could not be obtained unless the character of the game was
\\ ( http://arxiv.org/abs/0909.4555 , 138kb)
------------------------------------------------------------------------------
\\
arXiv:0909.4789
Date: Fri, 25 Sep 2009 20:29:52 GMT (855kb)

Title: The Bibliometric Properties of Article Readership Information
Authors: Michael J. Kurtz, Guenther Eichhorn, Alberto Accomazzi, Carolyn S.
Grant, Markus Demleitner, Stephen S. Murray, Nathalie Martimbeau, Barbara
Elwell
Categories: cs.DL physics.soc-ph
Comments: ADS bibcode: 2005JASIS..56..111K This is the second paper (the first
is Worldwide Use and Impact of the NASA Astrophysics Data System Digital
Library) from the original article The NASA Astrophysics Data System:
Sociology, Bibliometrics, and Impact, which went on-line in the summer of
2003
Journal-ref: The Journal of the American Society for Information Science and
Technology, Vol. 56, p. 111 (2005)
DOI: 10.1002/asi.20096
\\
The NASA Astrophysics Data System (ADS), along with astronomy's journals and
data centers (a collaboration dubbed URANIA), has developed a distributed
on-line digital library which has become the dominant means by which
astronomers search, access and read their technical literature. Digital
libraries such as the NASA Astrophysics Data System permit the easy
accumulation of a new type of bibliometric measure, the number of electronic
accesses (reads'') of individual articles. We explore various aspects of this
new measure. We examine the obsolescence function as measured by actual reads,
and show that it can be well fit by the sum of four exponentials with very
different time constants. We compare the obsolescence function as measured by
readership with the obsolescence function as measured by citations. We find
that the citation function is proportional to the sum of two of the components
of the readership function. This proves that the normative theory of citation
is true in the mean. We further examine in detail the similarities and
differences between the citation rate, the readership rate and the total
citations for individual articles, and discuss some of the causes. Using the
number of reads as a bibliometric measure for individuals, we introduce the
read-cite diagram to provide a two-dimensional view of an individual's
scientific productivity. We develop a simple model to account for an
individual's reads and cites and use it to show that the position of a person
in the read-cite diagram is a function of age, innate productivity, and work
history. We show the age biases of both reads and cites, and develop two new
bibliometric measures which have substantially less age bias than citations
\\ ( http://arxiv.org/abs/0909.4789 , 855kb)
------------------------------------------------------------------------------

The replacements:

------------------------------------------------------------------------------
\\
arXiv:0810.1593
replaced with revised version Sun, 27 Sep 2009 06:33:35 GMT (401kb)

Title: Nonlinear Ramsey interferometry with the Rosen-Zener pulses on a
two-component Bose-Einstein condensate
Authors: Sheng-Chang Li, Li-Bin Fu, Wen-Shan Duan, Jie Liu
Categories: cond-mat.other
Comments: 8 pages, 9 figures
Journal-ref: Physical Review A, 78, 063621, 2008
\\ ( http://arxiv.org/abs/0810.1593 , 401kb)
------------------------------------------------------------------------------
\\
arXiv:0903.1309
replaced with revised version Fri, 25 Sep 2009 14:09:27 GMT (330kb)

Title: Simulation of complete many-body quantum dynamics using controlled
quantum-semiclassical hybrids
Authors: Piotr Deuar
Categories: cond-mat.other
Comments: Published version. Broader background and discussion, slightly
shortened, less figures in epaps. Research part unchanged. Article + epaps
(4+4 pages), 8 figures
Journal-ref: Phys. Rev. Lett. 103, 130402 (2009)
\\ ( http://arxiv.org/abs/0903.1309 , 330kb)
------------------------------------------------------------------------------
\\
arXiv:0903.1647
replaced with revised version Fri, 25 Sep 2009 18:18:05 GMT (35kb)

Title: Stability of low-dimensional multicomponent Bose gases
Authors: Alexei Kolezhuk
Categories: cond-mat.other cond-mat.str-el
Comments: 7 pages, 4 figures; (v3) substantially extended and corrected
\\ ( http://arxiv.org/abs/0903.1647 , 35kb)
------------------------------------------------------------------------------
\\
arXiv:0903.4145
replaced with revised version Tue, 29 Sep 2009 22:50:59 GMT (175kb,D)

Title: A general theoretical description of N-body recombination
Authors: N. P. Mehta, Seth T. Rittenhouse, J. P. D'Incao, J. von Stecher, Chris
H. Greene
Categories: physics.atom-ph
Comments: 4 pages, 2 figures RevTeX
\\ ( http://arxiv.org/abs/0903.4145 , 175kb)
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\\
arXiv:0905.2082
replaced with revised version Wed, 30 Sep 2009 08:35:16 GMT (923kb,D)

Title: Transport of polar molecules by an alternating gradient guide
Authors: T. E. Wall, S. Armitage, J. J. Hudson, B. E. Sauer, J. M. Dyne, E. A.
Hinds, M. R. Tarbutt
Categories: physics.atom-ph
Comments: 10 pages, 5 figures; revised following referee suggestions
\\ ( http://arxiv.org/abs/0905.2082 , 923kb)
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\\
arXiv:0905.2610
replaced with revised version Sat, 26 Sep 2009 03:47:49 GMT (1359kb)

Title: Two-orbital SU(N) magnetism with ultracold alkaline-earth atoms
Authors: A. V. Gorshkov, M. Hermele, V. Gurarie, C. Xu, P. S. Julienne, J. Ye,
P. Zoller, E. Demler, M. D. Lukin, A. M. Rey
Categories: cond-mat.quant-gas cond-mat.str-el quant-ph
Comments: 15 pages, 10 figures. V2: extended experimental accessibility and
Kondo sections in the main text (including new Fig. 5b) and in the Methods;
reorganized other parts; added references
\\ ( http://arxiv.org/abs/0905.2610 , 1359kb)
------------------------------------------------------------------------------
\\
arXiv:0906.3718
replaced with revised version Fri, 25 Sep 2009 18:03:02 GMT (16kb)

Title: Mott Insulators of Ultracold Fermionic Alkaline Earth Atoms:
Underconstrained Magnetism and Chiral Spin Liquid
Authors: Michael Hermele, Victor Gurarie, and Ana Maria Rey
Categories: cond-mat.quant-gas cond-mat.mes-hall cond-mat.str-el
Comments: 4 pages, 2 figures, 1 table. Minor changes from v2. Final published
version
Journal-ref: Phys. Rev. Lett. 103, 135301 (2009)
DOI: 10.1103/PhysRevLett.103.135301
\\ ( http://arxiv.org/abs/0906.3718 , 16kb)
------------------------------------------------------------------------------
\\
arXiv:0906.3725
replaced with revised version Wed, 30 Sep 2009 10:12:06 GMT (2484kb,D)

Title: Quantum coherence and entanglement in the avian compass
Authors: Erik Gauger, Elisabeth Rieper, John J. L. Morton, Simon C. Benjamin,
and Vlatko Vedral
Categories: quant-ph
\\ ( http://arxiv.org/abs/0906.3725 , 2484kb)
------------------------------------------------------------------------------
\\
arXiv:0906.4143
replaced with revised version Tue, 29 Sep 2009 23:36:42 GMT (355kb)

Title: Dynamics of a bistable Mott insulator to superfluid phase transition in
cavity optomechanics
Authors: K. Zhang, W. Chen, P. Meystre
Categories: quant-ph cond-mat.other
Comments: 6 pages, 5 figures
\\ ( http://arxiv.org/abs/0906.4143 , 355kb)
------------------------------------------------------------------------------
\\
arXiv:0907.0723
replaced with revised version Thu, 24 Sep 2009 20:36:42 GMT (170kb)

Title: Magnetization of Planar Four-Fermion Systems
Authors: Heron Caldas, Rudnei O. Ramos
Categories: cond-mat.soft cond-mat.other hep-ph
Comments: 10 pages, two-column, revtex style, 6 eps figures. Published version
Journal-ref: Phys. Rev. B80 (2009) 115428
DOI: 10.1103/PhysRevB.80.115428
\\ ( http://arxiv.org/abs/0907.0723 , 170kb)
------------------------------------------------------------------------------
\\
arXiv:0907.1025
replaced with revised version Mon, 28 Sep 2009 12:44:07 GMT (135kb)

Title: Coherence time of a Bose-Einstein condensate
Authors: Alice Sinatra (LKB - Lhomond), Yvan Castin (LKB - Lhomond), Emilia
Witkowska
Categories: cond-mat.quant-gas
Comments: 17 pages, 8 figures; typos corrected
Journal-ref: Physical Review A 80 (2009) 033614
\\ ( http://arxiv.org/abs/0907.1025 , 135kb)
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\\
arXiv:0907.1584
replaced with revised version Thu, 1 Oct 2009 01:51:40 GMT (323kb)

Title: Three-vortex configurations in trapped Bose-Einstein condensates
Authors: J. A. Seman, E. A. L. Henn, M. Haque, R. F. Shiozaki, E. R. F. Ramos,
M. Caracanhas, C. Castelo Branco, G. Roati, K. M. F. Magalh\~aes and V. S.
Bagnato
Categories: cond-mat.quant-gas
Comments: 4 pages, 4 figures 2 figures modified and 1 figure added content
changed
\\ ( http://arxiv.org/abs/0907.1584 , 323kb)
------------------------------------------------------------------------------
\\
arXiv:0907.3147
replaced with revised version Fri, 25 Sep 2009 14:30:16 GMT (11kb)

Title: Number operator-annihilation operator uncertainty as an alternative of
the number-phase uncertainty relation
Authors: Inigo Urizar Lanz, Geza Toth
Categories: quant-ph
Comments: 4 pages including 1 figure, revtex4; typos corrected, presentation
improved
\\ ( http://arxiv.org/abs/0907.3147 , 11kb)
------------------------------------------------------------------------------
\\
arXiv:0907.3243
replaced with revised version Wed, 30 Sep 2009 13:31:43 GMT (10kb)

Title: Exact bosonization for an interacting Fermi gas in arbitrary dimensions
Authors: K.B. Efetov, C. Pepin, H. Meier
Categories: cond-mat.str-el cond-mat.stat-mech
Comments: Basic equations are derived more carefully and in a simpler way
\\ ( http://arxiv.org/abs/0907.3243 , 10kb)
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\\
arXiv:0908.4254
replaced with revised version Fri, 25 Sep 2009 02:55:18 GMT (86kb)

Title: Spontaneous Vortex Production in Driven Condensates with Narrow Feshbach
Resonances
Authors: Ray Rivers, Da-Shin Lee and Chi-Yong Lin
Categories: cond-mat.quant-gas
Comments: 4 pages, 1 figure
\\ ( http://arxiv.org/abs/0908.4254 , 86kb)
------------------------------------------------------------------------------
\\
arXiv:0909.1660
replaced with revised version Fri, 25 Sep 2009 14:07:22 GMT (166kb)

Title: Matter-wave dark solitons: stochastic vs. analytical results
Authors: S.P. Cockburn, H.E. Nistazakis, T.P. Horikis, P.G. Kevrekidis, N.P.
Proukakis, D.J. Frantzeskakis
Categories: cond-mat.quant-gas cond-mat.other
Comments: 4 pages, 3 figures. Added several references
\\ ( http://arxiv.org/abs/0909.1660 , 166kb)
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\\
arXiv:0909.3937
replaced with revised version Tue, 29 Sep 2009 10:18:10 GMT (100kb)

Title: Gauge-Away Effect in Cold Gases on Optical Lattices
Authors: O. Boada, A. Celi and J.I. Latorre
Categories: cond-mat.quant-gas cond-mat.other hep-th quant-ph
Comments: 4 pages, 2 figures, revtex style; v2 typos corrected, submitted to
PRL
\\ ( http://arxiv.org/abs/0909.3937 , 100kb)
------------------------------------------------------------------------------

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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views of the sender and not the views of the University of Queensland
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