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

Date: Thu, 12 Nov 2009 08:50:41 +1000

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.

Advert:

http://www.seek.com.au/job/postdoctoral-research-fellow/brisbane/16212452/81/1/

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

Comments: 5 figures

\\

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

Comments: 9 pages

\\

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

Comments: 6 pages

\\

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.

Martin-Delgado

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

Comments: 13 pages

\\

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

Comments: 5 figures

\\

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

Comments: 12 pages

\\

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)

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\\

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)

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\\

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)

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\\

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)

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\\

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

Comments: 15 pages,

\\

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)

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\\

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)

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\\

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)

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\\

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)

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\\

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)

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\\

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)

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\\

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)

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\\

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)

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\\

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)

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\\

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

radically changed.

\\ ( http://arxiv.org/abs/0909.4555 , 138kb)

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\\

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)

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The replacements:

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\\

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)

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\\

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)

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\\

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)

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\\

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)

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\\

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)

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\\

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

Comments: 10 pages, added Supporting Material

\\ ( http://arxiv.org/abs/0906.3725 , 2484kb)

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\\

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)

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\\

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)

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\\

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)

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\\

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)

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\\

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)

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\\

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)

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Till next time,

Matt.

-- ========================================================================= Dr M. J. Davis, Associate Professor in Physics School of Mathematics and Physics, ph : +61 7 334 69824 The University of Queensland, fax : +61 7 336 51242 Brisbane, QLD 4072, mdavis_at_physics.uq.edu.au Australia. www.physics.uq.edu.au/people/mdavis/ ========================================================================= Matt's arXiv selection: weekly summary of cold-atom papers from arXiv.org http://www.physics.uq.edu.au/people/mdavis/matts_arXiv/ ========================================================================= Legal stuff: Unless stated otherwise, this e-mail represents only the views of the sender and not the views of the University of Queensland ========================================================================= _______________________________________________ Matts-arxiv mailing list Matts-arxiv_at_lists.sps.uq.edu.auReceived on Fri Nov 20 2009 - 18:56:28 EST

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