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

Date: Mon, 20 Nov 2006 11:51:23 +1000 (EST)

Date: Mon, 20 Nov 2006 11:51:23 +1000 (EST)

The following message was sent to the matts_arxiv list by Matthew Davis <mdavis_at_physics.uq.edu.au>

Thirty one new papers listed this week.

Home page: http://www.physics.uq.edu.au/people/mdavis/matts_arXiv/

New abstracts:

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Paper: cond-mat/0611264

Date: Thu, 9 Nov 2006 21:14:18 GMT (43kb)

Title: The Fermion Monte Carlo revisited

Authors: Roland Assaraf (LCT), Michel Caffarel (LPQ), Anatole Khelif (ELM)

Comments: 49 pages with 4 postscript figures

Proxy: ccsd hal-00112854

Report-no: LCPQ-2006

Subj-class: Strongly Correlated Electrons

\\

In this work we present a detailed study of the Fermion Monte Carlo algorithm

(FMC), a recently proposed stochastic method for calculating fermionic

ground-state energies [M.H. Kalos and F. Pederiva, Phys. Rev. Lett. vol. 85,

3547 (2000)]. A proof that the FMC method is an exact method is given. In this

work the stability of the method is related to the difference between the

lowest (bosonic-type) eigenvalue of the FMC diffusion operator and the exact

fermi energy. It is shown that within a FMC framework the lowest eigenvalue of

the new diffusion operator is no longer the bosonic ground-state eigenvalue as

in standard exact Diffusion Monte Carlo (DMC) schemes but a modified value

which is strictly greater. Accordingly, FMC can be viewed as an exact DMC

method built from a correlated diffusion process having a reduced Bose-Fermi

gap. As a consequence, the FMC method is more stable than any transient method

(or nodal release-type approaches). We illustrate the various ideas presented

in this work with calculations performed on a very simple model having only

nine states but a full sign problem. Already for this toy model it is clearly

seen that FMC calculations are inherently uncontrolled.

\\ ( http://arXiv.org/abs/cond-mat/0611264 , 43kb)

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Paper: cond-mat/0611279

Date: Fri, 10 Nov 2006 11:24:52 GMT (523kb)

Title: Non-equilibrium dynamics: Studies of reflection of Bose-Einstein

condensates

Authors: R. G. Scott, C. W. Gardiner, and D. A. W. Hutchinson

Subj-class: Statistical Mechanics

\\

The study of the non-equilibrium dynamics in Bose-Einstein condensed gases

has been dominated by the zero-temperature, mean field Gross-Pitaevskii

formalism. Motivated by recent experiments on the reflection of condensates

from silicon surfaces, we revisit the so-called {\em classical field}

description of condensate dynamics, which incorporates the effects of quantum

noise and can also be generalized to include thermal effects. The noise is

included in a stochastic manner through the initial conditions. We show that

the inclusion of such noise is important in the quantitative description of the

recent reflection experiments.

\\ ( http://arXiv.org/abs/cond-mat/0611279 , 523kb)

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Paper: cond-mat/0611285

Date: Fri, 10 Nov 2006 17:11:01 GMT (14kb)

Title: Note on "Collective Excitations of a Degenerate Gas at the BEC-BCS

Crossover", Phys. Rev. Lett. 92, 203201 (2004)

Authors: A. Altmeyer, S. Riedl, C. Kohstall, M.J. Wright, J. Hecker Denschlag,

and R. Grimm

Comments: 2 pages, 1 figure

Subj-class: Other; Superconductivity

\\

We present a reinterpretation of our previous results on the radial

compression mode of a degenerate quantum gas in the BEC-BCS crossover in [1].

We show that our former data are consistent with other experimental and

theoretical work, when the ellipticity of the optical trapping potential in [1]

is properly taken into account.

\\ ( http://arXiv.org/abs/cond-mat/0611285 , 14kb)

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Paper: cond-mat/0611286

Date: Fri, 10 Nov 2006 17:12:39 GMT (666kb)

Title: Gap solitons in Bose-Einstein condensates in linear and nonlinear

optical lattices

Authors: Fatkhulla Abdullaev, Abdulaziz Abdumalikov, Ravil Galimzyanov

Comments: 9 pages, 14 figures

Subj-class: Other

\\

Properties of localized states on array of BEC confined to a potential,

representing superposition of linear and nonlinear optical lattices are

investigated. For a shallow lattice case the coupled mode system has been

derived. The modulational instability of nonlinear plane waves is analyzed. We

revealed new types of gap solitons and studied their stability. For the first

time a moving soliton solution has been found. Analytical predictions are

confirmed by numerical simulations of the Gross-Pitaevskii equation with

jointly acting linear and nonlinear periodic potentials.

\\ ( http://arXiv.org/abs/cond-mat/0611286 , 666kb)

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Paper (*cross-listing*): hep-th/0611090

Date: Wed, 8 Nov 2006 10:52:52 GMT (32kb)

Title: Bosonization and Scale Invariance on Quantum Wires

Authors: B. Bellazzini, M. Mintchev and P. Sorba

Comments: LaTex 30+1 pages, 2 figures

Report-no: IFUP-TH 25/2006, LAPTH-1166/06

Subj-class: High Energy Physics - Theory; Mesoscopic Systems and Quantum Hall

Effect; Mathematical Physics

\\

We develop a systematic approach to bosonization and vertex algebras on

quantum wires of the form of star graphs. The related bosonic fields propagate

freely in the bulk of the graph, but interact at its vertex. Our framework

covers all possible interactions preserving unitarity. Special attention is

devoted to the scale invariant interactions, which determine the critical

properties of the system. Using the associated scattering matrices, we give a

complete classification of the critical points on a star graph with any number

of edges. Critical points where the system is not invariant under wire

permutations are discovered. By means of an appropriate vertex algebra we

perform the bosonization of fermions and solve the massless Thirring model. In

this context we derive an explicit expression for the conductance and

investigate its behavior at the critical points. A simple relation between the

conductance and the Casimir energy density is pointed out.

\\ ( http://arXiv.org/abs/hep-th/0611090 , 32kb)

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Paper: cond-mat/0611295

Date: Sat, 11 Nov 2006 04:17:15 GMT (47kb)

Title: Oscillatory vortex interaction in a gapless fermion superfluid with spin

population imbalance

Authors: Vladimir M. Stojanovic, W. Vincent Liu, Yong Baek Kim

Comments: 4+ pages, 2 figures

Subj-class: Superconductivity; Other

\\

Using effective field theory approach we study a homogeneous superfluid state

with a single (gapless) Fermi surface, recently suggested as a possible phase

for an ultracold Fermi gas with spin-population imbalance. We find an

unconventional form of the interaction between vortices. The presence of

gapless fermions gives rise to an attractive long-range potential oscillating

in space, analogous to the RKKY magnetic interaction in metals. Our study then

leads to an interesting question as to the nature of the vortex lattice in the

presence of competition between the usual repulsive logarithmic Coulomb and

fermion-induced attractive oscillatory interactions.

\\ ( http://arXiv.org/abs/cond-mat/0611295 , 47kb)

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Paper: cond-mat/0611312

Date: Mon, 13 Nov 2006 05:26:28 GMT (23kb)

Title: Bragg spectroscopy of a cigar shaped Bose condensate in optical lattices

Authors: Tarun Kanti Ghosh and Kazushige Machida

Comments: 6 pages, 5 figures

Subj-class: Other

\\

We study properties of excited states of an array of weakly coupled

quasi-two-dimensional Bose condensates by using the hydrodynamic theory. We

calculate multibranch Bogoliubov-Bloch spectrums and its corresponding

eigenfunctions. The spectrum of the axial excited states and its eigenfunctions

strongly depends on the coupling among various discrete radial modes within a

given symmetry. This mode coupling is due to the presence of radial trapping

potential. The multibranch nature of the Bogoliubov-Bloch spectrum and its

dependence on the mode-coupling can be realized by analyzing dynamic structure

factor and momentum transferred to the system in Bragg spectroscopy

experiments. We also study dynamic structure factor and momentum transferred to

the condensate due to the Bragg spectroscopy experiment.

\\ ( http://arXiv.org/abs/cond-mat/0611312 , 23kb)

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Paper: cond-mat/0611321

Date: Mon, 13 Nov 2006 10:14:44 GMT (612kb)

Title: One-particle dynamical correlations in the one-dimensional Bose gas

Authors: Jean-Sebastien Caux, Pasquale Calabrese, and Nikita A. Slavnov

Comments: 19 Pages, 7 figures

Subj-class: Statistical Mechanics

\\

The momentum- and frequency-dependent one-body correlation function of the

one-dimensional interacting Bose gas (Lieb-Liniger model) in the repulsive

regime is studied using the Algebraic Bethe Ansatz and numerics. We first

provide a determinant representation for the field form factor which is

well-adapted to numerical evaluation. The correlation function is then

reconstructed to high accuracy for systems with finite but large numbers of

particles, for a wide range of values of the interaction parameter. Our results

are extensively discussed, in particular their specialization to the static

case.

\\ ( http://arXiv.org/abs/cond-mat/0611321 , 612kb)

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Paper: cond-mat/0611332

Date: Mon, 13 Nov 2006 17:15:50 GMT (331kb)

Title: Lifshitz-like transition and enhancement of correlations in a rotating

bosonic ring lattice

Authors: Ana Maria Rey, Keith Burnett, Indubala I. Satija and Charles W. Clark

Comments: 5 pages, 4 figures

Subj-class: Other

\\

We study the effects of rotation on one-dimensional ultra-cold bosons

confined to a ring lattice. For commensurate systems, at a critical value of

the rotation frequency, an infinitesimal interatomic interaction energy opens a

gap in the excitation spectrum, fragments the ground state into a macroscopic

superposition of two states with different circulation and generates a sudden

change in the topology of the momentum distribution. These features are

reminiscent of the topological changes in the Fermi surface that occurs in the

Lifshitz transition in fermionic systems. The entangled nature of the ground

state induces a strong enhancement of quantum correlations and decreases the

threshold for the Mott insulator transition. In contrast to the commensurate

case, the incommensurate lattice is rather insensitive to rotation. Our studies

demonstrate the utility of noise correlations as a tool for identifying new

physics in strongly correlated systems.

\\ ( http://arXiv.org/abs/cond-mat/0611332 , 331kb)

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Paper: quant-ph/0611121

Date: Sat, 11 Nov 2006 22:56:52 GMT (71kb)

Title: A measurement-based measure of the size of macroscopic quantum

superpositions

Authors: Jan Ivar Korsbakken, K. Birgitta Whaley, Jonathan DuBois, J. Ignacio

Cirac

Comments: 20 pages, 22 figures. Submitted to Phys. Rev. A

\\

Recent experiments claiming formation of quantum superposition states in near

macroscopic systems raise the question of how the sizes of general quantum

superposition states in an interacting system are to be quantified. We propose

here a measure of size for such superposition states that is based on what

measurements can be performed to probe and distinguish the different branches

of the state. The measure allows comparison of the effective size for

superposition states in very different physical systems. It can be applied to a

very general class of superposition states and reproduces known results for

near-ideal cases. Comparison with a prior measure based on analysis of

coherence between branches indicates that significantly smaller effective

superposition sizes result from our measurement-based measure. Application to a

system of interacting bosons in a double-well trapping potential shows that the

effective superposition size is strongly dependent on the relative magnitude of

the barrier height and interparticle interaction.

\\ ( http://arXiv.org/abs/quant-ph/0611121 , 71kb)

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Paper: quant-ph/0611128

Date: Sat, 11 Nov 2006 18:44:39 GMT (190kb)

Title: Dual species matter qubit entangled with light

Authors: S.-Y. Lan, S. D. Jenkins, T. Chaneliere, D. N. Matsukevich, C. J.

Campbell, R. Zhao, T. A. B. Kennedy, and A. Kuzmich

Comments: 5 pages, 3 figures

\\

We propose and demonstrate an atomic qubit based on a cold

$^{85}$Rb-$^{87}$Rb isotopic mixture, entangled with a frequency-encoded

optical qubit. The interface of an atomic qubit with a single spatial light

mode, and the ability to independently address the two atomic qubit states,

should provide the basic element of an interferometrically robust quantum

network.

\\ ( http://arXiv.org/abs/quant-ph/0611128 , 190kb)

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Paper: quant-ph/0611132

Date: Sun, 12 Nov 2006 18:21:45 GMT (10kb)

Title: Delocalized Entanglement of Atoms in optical Lattices

Authors: K. G. H. Vollbrecht and J. I. Cirac

\\

We show how to detect and quantify entanglement of atoms in optical lattices

in terms of correlations functions of the momentum distribution. These

distributions can be measured directly in the experiments. We introduce two

kinds of entanglement measures related to the position and the spin of the

atoms.

\\ ( http://arXiv.org/abs/quant-ph/0611132 , 10kb)

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Paper: quant-ph/0611132

Date: Sun, 12 Nov 2006 18:21:45 GMT (10kb)

Title: Delocalized Entanglement of Atoms in optical Lattices

Authors: K. G. H. Vollbrecht and J. I. Cirac

\\

We show how to detect and quantify entanglement of atoms in optical lattices

in terms of correlations functions of the momentum distribution. These

distributions can be measured directly in the experiments. We introduce two

kinds of entanglement measures related to the position and the spin of the

atoms.

\\ ( http://arXiv.org/abs/quant-ph/0611132 , 10kb)

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Paper: physics/0611119

Date: Mon, 13 Nov 2006 13:23:13 GMT (200kb)

Title: The discovery of superfluidity

Authors: Sebastien Balibar (LPS)

Comments: 30 pages

Proxy: ccsd hal-00113242

Subj-class: History of Physics

\\

Superfluidity is a remarkable manifestation of quantum mechanics at the

macroscopic level. This article describes the history of its discovery, which

took place at a particularly difficult period of the twentieth century. A

special emphasis is given to the role of J.F. Allen, D. Misener, P. Kapitza, F.

London, L. Tisza and L.D. Landau. The nature and the importance of their

respective contributions are analyzed and compared. Of particular interest is

the controversy between Landau on one side, London and Tisza on the other,

concerning the relevance of Bose-Einstein condensation to the whole issue, and

also on the nature of thermal excitations in superfluid helium 4. In order to

aid my understanding of this period, I have collected several testimonies which

inform us about the work and attitude of these great scientists.

\\ ( http://arXiv.org/abs/physics/0611119 , 200kb)

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Paper: cond-mat/0611357

Date: Tue, 14 Nov 2006 10:55:28 GMT (24kb)

Title: Bose-Einstein-condensed systems in random potentials

Authors: V.I. Yukalov and R. Graham

Comments: Latex file, 34 pages

Subj-class: Statistical Mechanics

\\

The properties of systems with Bose-Einstein condensate in external

time-independent random potentials are investigated in the frame of a

self-consistent stochastic mean-field approximation. General considerations are

presented, which are valid for finite temperatures, arbitrary strengths of the

interaction potential, and for arbitrarily strong disorder potentials. The

special case of a spatially uncorrelated random field is then treated in more

detail. For this case it is shown that the system consists of three components,

condensed particles, uncondensed particles and a glassy density-fraction, but

that the pure Bose glass phase with only a glassy density does not appear. The

theory predicts a first-order phase transition for increasing disorder

parameter, where the condensate fraction and the superfluid fraction

simultaneously jump to zero. The influence of disorder on the ground-state

energy, the stability conditions, the compressibility, the structure factor,

and the sound velocity are analysed.

\\ ( http://arXiv.org/abs/cond-mat/0611357 , 24kb)

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Paper: cond-mat/0611376

Date: Tue, 14 Nov 2006 16:57:28 GMT (28kb)

Title: The angular momentum of a magnetically trapped atomic condensate

Authors: P. Zhang, H. H. Jen, C. P. Sun and L. You

Comments: 4 pages, 1 figures

Subj-class: Other

\\

For an atomic condensate in an axially symmetric magnetic trap, the sum of

the axial components of the orbital angular momentum and the hyperfine spin is

conserved. Inside an Ioffe-Pritchard trap (IPT) whose magnetic field (B-field)

is not axially symmetric, the difference of the two becomes surprisingly

conserved. In this paper we investigate the relationship between the values of

the sum/difference angular momentums for an atomic condensate inside a magnetic

trap and the associated gauge potential induced by the adiabatic approximation.

Our result provides significant new insight into the vorticity of magnetically

trapped atomic quantum gases.

\\ ( http://arXiv.org/abs/cond-mat/0611376 , 28kb)

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Paper: cond-mat/0611379

Date: Tue, 14 Nov 2006 18:25:58 GMT (143kb)

Title: Predicting spinor condensate dynamics from simple principles

Authors: M. Moreno-Cardoner, J. Mur-Petit, M. Guilleumas, A. Polls, A. Sanpera,

and M. Lewenstein

Comments: 4 pages, 2 figures

Subj-class: Mesoscopic Systems and Quantum Hall Effect

\\

We study the dynamics of spinor F=1 condensates both at zero and finite

temperature for arbitrary initial spin configurations in elongated 1D

condensates. We find that the rich spin dynamics exhibited by these systems,

can be predicted from surprisingly simple principles applied to the homogeneous

system: by imposing minimization of energy at zero temperature, and by

maximization of entropy at finite temperature. These predictions, which can

serve as a guidance for future experiments, are corroborated by numerical

simulations in the confined system and compare qualitatively well with recent

experimental observations for a wide varietey of initial parameters

(magnetization, spin component population and relative phases). The formation

of spin domains in the confined system is also discussed.

\\ ( http://arXiv.org/abs/cond-mat/0611379 , 143kb)

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Paper: quant-ph/0611148

Date: Tue, 14 Nov 2006 09:06:06 GMT (245kb)

Title: Localization of atomic ensembles via superfluorescence

Authors: M. Macovei, J. Evers, C. H. Keitel, M. S. Zubairy

Comments: 7 pages, 6 figures

\\

The sub-wavelength localization of an ensemble of atoms concentrated to a

small volume in space is investigated. The localization relies on the

interaction of the ensemble with a standing wave laser field. The light

scattered in the interaction of standing wave field and atom ensemble depends

on the position of the ensemble relative to the standing wave nodes. This

relation can be described by a fluorescence intensity profile, which depends on

the standing wave field parameters, the ensemble properties, and which is

modified due to collective effects in the ensemble of nearby particles. We

demonstrate that the intensity profile can be tailored to suit different

localization setups. Finally, we apply these results to two localization

schemes. First, we show how to localize an ensemble fixed at a certain position

in the standing wave field. Second, we discuss localization of an ensemble

passing through the standing wave field.

\\ ( http://arXiv.org/abs/quant-ph/0611148 , 245kb)

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Paper: quant-ph/0611152

Date: Tue, 14 Nov 2006 11:34:26 GMT (7kb)

Title: Casimir-Polder force density between an atom and a conducting wall

Authors: R. Messina, R. Passante

Comments: 5 pages

\\

In this paper we calculate the Casimir-Polder force density (force per unit

area acting on the elements of the surface) on a metallic plate placed in front

of a neutral atom. To obtain the force density we use the quantum operator

associated to the electromagnetic stress tensor. We explicitly show that the

integral of this force density over the plate reproduces the total force acting

on the plate. This result shows that, although the force is obtained as a sum

of surface element-atom contributions, the stress-tensor method includes also

nonadditive components of Casimir-Polder forces in the evaluation of the force

acting on a macroscopic object.

\\ ( http://arXiv.org/abs/quant-ph/0611152 , 7kb)

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Paper: cond-mat/0611386

Date: Wed, 15 Nov 2006 15:20:30 GMT (40kb)

Title: Topological defects, "magnetic charges" and coherence in dipolar

excitonic condensates

Authors: Egor Babaev

Subj-class: Superconductivity; Mesoscopic Systems and Quantum Hall Effect

\\

The current progress in fabrication technology raised the expectation for the

creation of excitonic condensates in semiconductor bilayers. We discuss an

effective model for such bilayers paying special attention to dynamics of the

gauge field. We find topological defects which emit radial quantized magnetic

flux and identify a regime where the effective model has planar electrodynamics

with effective "magnetic charges". We also find that the system possesses a

Kosterlitz-Thouless transition with a non-universal superfluid density jump and

propose experimental probes for these phenomena.

\\ ( http://arXiv.org/abs/cond-mat/0611386 , 40kb)

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Paper: cond-mat/0611402

Date: Wed, 15 Nov 2006 11:27:43 GMT (569kb)

Title: Coexisting ordinary elasticity and superfluidity in a model of

defect-free supersolid

Authors: Christophe Josserand, Yves Pomeau and Sergio Rica

Comments: 6 pages, 2 figures

Subj-class: Other

\\

We present the mechanics of a model of supersolid in the frame of the

Gross-Pitaevskii equation at $T=0K$ that do not require defects nor vacancies.

A set of coupled nonlinear partial differential equations plus boundary

conditions is derived. The mechanical equilibrium is studied under external

constrains as steady rotation or external stress. Our model displays a

paradoxical behavior: the existence of a non classical rotational inertia

fraction in the limit of small rotation speed and no superflow under small (but

finite) stress nor external force. The only matter flow for finite stress is

due to plasticity.

\\ ( http://arXiv.org/abs/cond-mat/0611402 , 569kb)

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Paper: cond-mat/0611405

Date: Wed, 15 Nov 2006 13:54:01 GMT (142kb)

Title: Critical velocities in superfluids and the nucleation of vortices

Authors: E. Varoquaux

Comments: 33 pages, 16 figures, review paper submitted to C.R. Acad. Sci.

(Paris)

Subj-class: Other

\\

The problem of critical velocities in superfluids, that is the comprehension

of superfluidity breakdown by flow, has been long standing. One difficulty

stems from the existence of several breakdown mechanisms. A major advance has

come from the observation of single $2\pi$ phase slips, which arise from the

nucleation of quantised vortices, that is, their creation {\it ex nihilo}. The

statistical properties of the nucleation process in both the thermal regime and

the quantum regime are identified and analysed: vortex nucleation provides a

well-documented case of macroscopic quantum tunnelling (MQT). In particular, a

close scrutiny of the experimental data obtained on ultra-pure $^4$He reveals

the influence of damping on tunnelling, a rare occurrence where the effect of

the environment on MQT can be studied.

\\ ( http://arXiv.org/abs/cond-mat/0611405 , 142kb)

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Paper: cond-mat/0611416

Date: Wed, 15 Nov 2006 19:41:55 GMT (33kb)

Title: Ensemble averaged coherent state path integral for disordered bosons

with a repulsive interaction (Derivation of mean field equations)

Authors: Bernhard mieck

Comments: 37 pages; a second part, particulaly applicable for d=2 spatial

dimensions, is in preparation ('Derivation of a nonlinear sigma model')

Subj-class: Statistical Mechanics; Disordered Systems and Neural Networks

\\

We consider bosonic atoms with a repulsive contact interaction in a trap

potential for a Bose-Einstein condensation and additionally include a random

potential. The ensemble averages for two models of static and dynamic disorder

are performed and investigated in parallel. The bosonic many body systems of

the two disorder models are represented by coherent state path integrals on the

Keldysh time contour which allow exact ensemble averages for zero and finite

temperatures. These ensemble averages of coherent state path integrals

therefore present alternatives to replica field theories or supersymmetric

averaging techniques.

\\ ( http://arXiv.org/abs/cond-mat/0611416 , 33kb)

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Paper (*cross-listing*): nucl-th/0611046

Date: Tue, 14 Nov 2006 05:47:12 GMT (49kb)

Title: Superfluidity in neutron stars and cold atoms

Authors: A. Schwenk

Comments: 3 pages, 2 figures, talk at Quark Confinement and the Hadron Spectrum

VII, Ponta Delgada, September 2006

Subj-class: Nuclear Theory; Superconductivity

\\

We discuss superfluidity in neutron matter, with particular attention to

induced interactions and to universal properties accessible with cold atoms.

\\ ( http://arXiv.org/abs/nucl-th/0611046 , 49kb)

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Paper: physics/0611155

Date: Wed, 15 Nov 2006 17:01:30 GMT (194kb)

Title: Probing the electron EDM with cold molecules

Authors: B.E. Sauer, H.T. Ashworth, J.J. Hudson, M.R. Tarbutt, E.A. Hinds

Comments: 8 pages, 6 figures, proceedings of ICAP 2006

Subj-class: Atomic Physics

Journal-ref: Atomic Physics 20, pp. 44-52 (2006)

\\

We present progress towards a new measurement of the electron electric dipole

moment using a cold supersonic beam of YbF molecules. Data are currently being

taken with a sensitivity of $10^{-27}\textrm{e.cm}/\sqrt{\textrm{day}}$. We

therefore expect to make an improvement over the Tl experiment of Commins'

group, which currently gives the most precise result. We discuss the systematic

and statistical errors and comment on the future prospect of making a

measurement at the level of $10^{-29}\textrm{e.cm}/\sqrt{\textrm{day}}$.

\\ ( http://arXiv.org/abs/physics/0611155 , 194kb)

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Paper: physics/0611154

Date: Wed, 15 Nov 2006 16:41:26 GMT (895kb)

Title: Optical ferris wheel for ultracold atoms

Authors: S. Franke-Arnold, J. Leach, M. J. Padgett, V. E. Lembessis, D.

Ellinas, A. J. Wright, J. M. Girkin, P. Ohberg, A. S. Arnold

Comments: 4 pages, 4 figures

Subj-class: Optics; Atomic Physics

\\

We propose a versatile optical ring lattice suitable for trapping cold and

quantum degenerate atomic samples at discrete angular positions. We demonstrate

the realisation of intensity patterns generated from Laguerre-Gauss ($\exp(i

\ell\theta)$) modes with different $\ell$ indices. The ring lattice can have

either intensity maxima or minima, suitable for trapping in red or blue detuned

light, and it can be rotated by introducing a frequency shift between the

Laguerre Gauss modes. The potential wells can be joined to form a uniform ring

trap, making it ideal for studying persistent currents and the Mott insulator

transition in a ring geometry.

\\ ( http://arXiv.org/abs/physics/0611154 , 895kb)

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Paper (*cross-listing*): cs.DL/0611060

Date: Tue, 14 Nov 2006 14:48:15 GMT (118kb)

Title: The effect of 'Open Access' upon citation impact: An analysis of ArXiv's

Condensed Matter Section

Authors: Henk F. Moed

Comments: Version 13 November 2006. 16 pages, 6 figures, 2 tables

Subj-class: Digital Libraries; Information Retrieval

\\

This article statistically analyses how the citation impact of articles

deposited in the Condensed Matter section of the preprint server ArXiv (hosted

by Cornell University), and subsequently published in a scientific journal,

compares to that of articles in the same journal that were not deposited in

that archive. Its principal aim is to further illustrate and roughly estimate

the effect of two factors, 'early view' and 'quality bias', upon differences in

citation impact between these two sets of papers, using citation data from

Thomson Scientific's Web of Science. It presents estimates for a number of

journals in the field of condensed matter physics. In order to discriminate

between an 'open access' effect and an early view effect, longitudinal citation

data was analysed covering a time period as long as 7 years. Quality bias was

measured by calculating ArXiv citation impact differentials at the level of

individual authors publishing in a journal, taking into account co-authorship.

The analysis provided evidence of a strong quality bias and early view effect.

Correcting for these effects, there is in a sample of 6 condensed matter

physics journals studied in detail, no sign of a general 'open access

advantage' of papers deposited in ArXiv. The study does provide evidence that

ArXiv accelerates citation, due to the fact that that ArXiv makes papers

earlier available rather than that it makes papers freely available.

\\ ( http://arXiv.org/abs/cs/0611060 , 118kb)

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Paper: cond-mat/0611421

Date: Thu, 16 Nov 2006 02:53:26 GMT (51kb)

Title: Pairing in Asymmetrical Fermi Systems with Intra- and Inter-Species

Correlations

Authors: Renyuan Liao and Khandker F. Quader (Dept of Physics, Kent State

University)

Comments: 5 pages, 3 figures

Subj-class: Superconductivity; Strongly Correlated Electrons

\\

We consider inter- and intra-species pairing interactions in an asymmetrical

Fermi system. Using equation of motion method, we obtain coupled mean-field

equations for superfluid gap functions and population densities. We construct a

phase diagram across BCS-BEC regimes. Due to intra-species correlations, the

BCS singlet superfluid state can sustain finite polarizations, $P$. For larger

$P$, we find phase separations in BCS and BEC regimes. A superfluid phase

exists for all $P$ deep in BEC regime. Our results may apply to pairing in

ultracold fermions, nuclear and quark matter physics.

\\ ( http://arXiv.org/abs/cond-mat/0611421 , 51kb)

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Paper: cond-mat/0611426

Date: Thu, 16 Nov 2006 08:54:45 GMT (3kb)

Title: Comment on "Classifying Novel Phases of Spinor Atoms"

Authors: S-.K. Yip

Comments: 1 page

Subj-class: Superconductivity

\\

Comment on "Classifying Novel Phases of Spinor Atoms", Phys. Rev. Lett. 97,

180412 (2006) by R. Barnett, A. Turner and E. Demler

\\ ( http://arXiv.org/abs/cond-mat/0611426 , 3kb)

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\\

Paper: quant-ph/0611174

Date: Thu, 16 Nov 2006 10:41:46 GMT (103kb)

Title: Controlled Creation of Spatial Superposition States for Single Atoms

Authors: K. Deasy, Th. Busch, Y. Niu, S. Gong, S. Jin and S. Nic Chormaic

Comments: 5 pages, 4 figures

\\

We present a method for the controlled and robust generation of spatial

superposition states of single atoms in micro-traps. Using a counter-intuitive

positioning sequence for the individual potentials and appropriately chosen

trapping frequencies, we show that it is possible to selectively create two

different orthogonal superposition states, which can in turn be used for

quantum information purposes.

\\ ( http://arXiv.org/abs/quant-ph/0611174 , 103kb)

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\\

Paper: quant-ph/0611178

Date: Thu, 16 Nov 2006 12:52:21 GMT (431kb)

Title: Preparation and Determination of Spin-Polarized States in

Multi-Zeeman-sublevel Atoms

Authors: Bo Wang, Yanxu Han, Jintao Xiao, Xudong Yang, Chunhong Zhang, Hai

Wang, Min Xiao, and Kunchi Peng

Comments: 17pages, 4figures, Submit to Physical Review Letters

\\

We demonstrate a simple technique to prepare and determine the desired

internal quantum states in multi-Zeeman-sublevel atoms. By choosing appropriate

coupling and pumping laser beams, atoms can be easily prepared in a desired

Zeeman sublevel with high purity or in any chosen ground-state population

distributions. The population distributions or state purities of such prepared

atomic states can be determined by using a weak, circularly-polarized probe

beam due to differences in transition strengths among different Zeeman

sublevels. Preparing well-defined internal quantum states in

multi-Zeeman-sublevel atoms (or spin-polarized quantum-state engineering) will

be very important in demonstrating many interesting effects in quantum

information processing with multi-level atomic systems.

\\ ( http://arXiv.org/abs/quant-ph/0611178 , 431kb)

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Replaced papers:

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Paper: cond-mat/0607463

replaced with revised version Thu, 9 Nov 2006 22:36:57 GMT (14kb)

Title: Quantum insulating states of F=2 cold atoms in optical lattices

Authors: Fei Zhou and Gordon W. Semenoff (UBC)

Comments: 4 pages, 1 figure included

Subj-class: Other

Journal-ref: Phys. Rev. Lett. 97, 180411 (2006)

\\ ( http://arXiv.org/abs/cond-mat/0607463 , 14kb)

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\\

Paper: cond-mat/0610162

replaced with revised version Thu, 9 Nov 2006 23:56:15 GMT (21kb)

Title: Discrete symmetries and 1/3-quantum vortices in condensates of F=2 cold

atoms

Authors: Gordon W. Semenoff and Fei Zhou (UBC)

Comments: 4 pages, 2 figures included; references updated

Subj-class: Other

\\ ( http://arXiv.org/abs/cond-mat/0610162 , 21kb)

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\\

Paper: cond-mat/0602437

replaced with revised version Mon, 13 Nov 2006 07:29:47 GMT (187kb)

Title: Phase diagrams of one-dimensional Bose-Fermi mixtures of ultra-cold

atoms

Authors: L. Mathey, D.-W. Wang

Comments: 16 pages, 8 figures, v3: minor changes

Subj-class: Other

\\ ( http://arXiv.org/abs/cond-mat/0602437 , 187kb)

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\\

Paper: cond-mat/0603654

replaced with revised version Mon, 13 Nov 2006 08:27:29 GMT (463kb)

Title: Dynamical density-density correlations in the one-dimensional Bose gas

Authors: J.-S. Caux and P. Calabrese

Comments: 4 pages, 3 figures, published version

Subj-class: Statistical Mechanics; Atomic Physics

Journal-ref: Phys.Rev. A74 (2006) 031605

\\ ( http://arXiv.org/abs/cond-mat/0603654 , 463kb)

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\\

Paper: cond-mat/0603655

replaced with revised version Mon, 13 Nov 2006 17:54:47 GMT (863kb)

Title: Towards a Bose-Glass of ultracold atoms in a disordered crystal of light

Authors: L. Fallani, J. E. Lye, V. Guarrera, C. Fort, M. Inguscio

Comments: 4 pages, 5 figures

Subj-class: Other

\\ ( http://arXiv.org/abs/cond-mat/0603655 , 863kb)

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\\

Paper: cond-mat/0605183

replaced with revised version Mon, 13 Nov 2006 10:21:41 GMT (345kb)

Title: Detecting phonons and persistent currents in toroidal Bose-Einstein

condensates by means of pattern formation

Authors: M. Modugno, C. Tozzo, F. Dalfovo

Comments: 4 pages, 4 figures; new figures, revised version to appear as a Rapid

Communication in Physical Review A

Subj-class: Other

\\ ( http://arXiv.org/abs/cond-mat/0605183 , 345kb)

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\\

Paper: cond-mat/0601420

replaced with revised version Tue, 14 Nov 2006 19:17:57 GMT (827kb)

Title: Production of cold molecules via magnetically tunable Feshbach

resonances

Authors: Thorsten Koehler, Krzysztof Goral, Paul S. Julienne

Comments: 50 pages, 26 figures, to be published in Reviews of Modern Physics,

final version with updated references

Subj-class: Other; Atomic Physics

\\ ( http://arXiv.org/abs/cond-mat/0601420 , 827kb)

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\\

Paper: cond-mat/0607438

replaced with revised version Tue, 14 Nov 2006 10:04:32 GMT (157kb)

Title: Guided Quasicontinuous Atom Laser

Authors: William Guerin (LCFIO), Jean-F\'{e}lix Riou (LCFIO), John P. Gaebler

(LCFIO), Vincent Josse (LCFIO), Philippe Bouyer (LCFIO), Alain Aspect (LCFIO)

Comments: version published in Phys. Rev. Lett. 97, 200402 (2006)

Proxy: ccsd ccsd-00085308

Subj-class: Other; Atomic Physics

\\ ( http://arXiv.org/abs/cond-mat/0607438 , 157kb)

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\\

Paper: cond-mat/0611054

replaced with revised version Tue, 14 Nov 2006 12:52:38 GMT (439kb)

Title: Formation of molecules and entangled atomic pairs from atomic BEC due to

Feshbach resonance

Authors: Vladimir A. Yurovsky (Tel Aviv University)

Comments: 34 pages, 15 figures

Subj-class: Soft Condensed Matter

\\ ( http://arXiv.org/abs/cond-mat/0611054 , 439kb)

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\\

Paper: quant-ph/0602098

replaced with revised version Tue, 14 Nov 2006 05:41:24 GMT (20kb)

Title: On quantum phase crossovers in finite systems

Authors: Clare Dunning, Katrina E. Hibberd, Jon Links

Comments: 11 pages, 2 figures. Final version accepted for publication

Journal-ref: J Stat Mech: Theor. Exp. (2006) P11005

DOI: 10.1088/1742-5468/2006/11/P11005

\\ ( http://arXiv.org/abs/quant-ph/0602098 , 20kb)

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Paper: quant-ph/0608158

replaced with revised version Tue, 14 Nov 2006 09:12:47 GMT (89kb)

Title: How much entanglement can be generated between two atoms by detecting

photons?

Authors: L. Lamata, J.J. Garcia-Ripoll, J.I. Cirac

Comments: 4 pages, 3 figures, minor improvements, references added, accepted in

PRL

\\ ( http://arXiv.org/abs/quant-ph/0608158 , 89kb)

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\\

Paper: cond-mat/0608355

replaced with revised version Wed, 15 Nov 2006 16:39:46 GMT (271kb)

Title: A Quantum Top Inside a Bose Josephson Junction

Authors: Ingrid Bausmerth, Uwe R. Fischer, Anna Posazhennikova

Comments: 4 pages of RevTex4, 4 figures; rewritten discussion and displayed new

results

Subj-class: Other

\\ ( http://arXiv.org/abs/cond-mat/0608355 , 271kb)

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\\

Paper: cond-mat/0609063

replaced with revised version Wed, 15 Nov 2006 19:48:27 GMT (245kb)

Title: Sign-free stochastic mean-field approach to strongly correlated phases

of ultracold fermions

Authors: Olivier Juillet (LPCC)

Proxy: ccsd ccsd-00090944

Subj-class: Other

\\ ( http://arXiv.org/abs/cond-mat/0609063 , 245kb)

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\\

Paper: quant-ph/0601038

replaced with revised version Wed, 15 Nov 2006 10:53:23 GMT (434kb)

Title: Generalized spin squeezing inequalities in $N$ qubit systems: theory and

experiment

Authors: J. K. Korbicz, O. G\"uhne, M. Lewenstein, H. Haeffner, C. F. Roos, and

R. Blatt

Comments: Final version

Journal-ref: Phys. Rev. A 74, 052319 (2006)

\\ ( http://arXiv.org/abs/quant-ph/0601038 , 434kb)

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\\

Paper: cond-mat/0610198

replaced with revised version Thu, 16 Nov 2006 09:43:01 GMT (174kb)

Title: Many-body dynamics of repulsively bound pairs of particles in a periodic

potential

Authors: David Petrosyan, Bernd Schmidt, James R. Anglin, Michael Fleischhauer

Subj-class: Other

\\ ( http://arXiv.org/abs/cond-mat/0610198 , 174kb)

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\\

Paper: physics/0608083

replaced with revised version Thu, 16 Nov 2006 20:27:11 GMT (476kb)

Title: Atom interferometry in a moving guide

Authors: Saijun Wu, Edward J. Su, Mara Prentiss

Comments: 12 pages, 4 figures (Updated data with new figures)

Subj-class: Atomic Physics; Optics

\\ ( http://arXiv.org/abs/physics/0608083 , 476kb)

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Till next week,

Matt.

-- ========================================================================= Dr M. J. Davis, Senior Lecturer in Physics School of Physical Sciences, email: mdavis_at_physics.uq.edu.au University of Queensland, ph : +61 7 334 69824 Brisbane, QLD 4072, fax : +61 7 336 51242 Australia. http://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 =========================================================================Received on Mon Nov 20 2006 - 11:51:23 EST

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