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

Date: Wed, 11 Mar 2009 07:48:11 +1000

Date: Wed, 11 Mar 2009 07:48:11 +1000

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

This week saw 15 new preprints and 10 replacements.

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arXiv:0901.0018

Date: Tue, 30 Dec 2008 21:41:23 GMT (2682kb)

Title: Obtaining phase diagram and thermodynamic quantities of bulk systems

from the densities of trapped gases

Authors: Tin-Lun Ho and Qi Zhou

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

Comments: 15pages, 2figures

\\

At present, many laboratories are performing experiments to simulate

theoretical models of strongly correlated systems using cold atoms in optical

lattices, a program referred to as "Quantum Simulation". It is hoped that these

experiments will shed light on some long standing problems in condensed matter

physics. The goal of Quantum Simulation is to obtain information of homogenous

bulk systems. However, experiments are performed in confining traps. The

non-uniformity of the trapping potential inevitably introduces different phases

in the sample, making it difficult to deduce the properties of a single bulk

phase. So far, there are no algorithms to use the experimental data to map out

phase diagrams and important thermodynamic quantities. Here, we present an

algorithm to achieve this goal. Apart from phase diagram, it also maps out

entropy density, superfluid density of superfluids, and staggered

magnetizations of anti-ferromagnets. Our scheme is exact within local density

approximation.

\\ ( http://arxiv.org/abs/0901.0018 , 2682kb)

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arXiv:0901.0210

Date: Fri, 2 Jan 2009 13:44:36 GMT (839kb,D)

Title: Exponential localization in one-dimensional quasiperiodic optical

lattices

Authors: Michele Modugno

Categories: cond-mat.other

Comments: 13 pages, 6 figures

\\

We investigate the localization properties of a one-dimensional bichromatic

optical lattice in the tight binding regime, by discussing how exponentially

localized states emerge upon changing the degree of commensurability. We also

review the mapping onto the discrete Aubry-Andre' model, and provide evidences

on how the momentum distribution gets modified in the crossover from extended

to exponentially localized states. This analysis is relevant to the recent

experiment on Anderson localization of a noninteracting Bose-Einstein

condensate in a quasiperiodic optical lattice [G. Roati et al., Nature 453, 895

(2008)].

\\ ( http://arxiv.org/abs/0901.0210 , 839kb)

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arXiv:0812.5073 (*cross-listing*)

Date: Fri, 26 Dec 2008 16:22:41 GMT (3209kb)

Title: Bright and dark solitons in Bose-Einstein condensates

Authors: S. Rajendran, P. Muruganandam, M. Lakshmanan

Categories: nlin.PS cond-mat.other nlin.SI

Comments: 30 pages, 31 figures, 3 tables

\\

We investigate the exact bright and dark solitary wave solutions of an one

dimensional Bose-Einstein condensate with a time varying scattering length and

gain or loss confined in an expulsive parabolic potential. We show that the

modified Gross-Pitaevskii (GP) equation with time varying control parameters is

transformable to the standard nonlinear Schr\"odinger (NLS) equation. By making

use of both the bright and dark soliton solutions of the standard NLS equation,

we bring out various dynamical features associated with Bose-Einstein

condensates such as the collapse and revival of condensate, formation of two

soliton bound state, oscillating solitons, snake-like solitons, soliton growth

and decay for time independent harmonic potentials. We also point out the

existence of such soliton solutions in the experimental range of parameters for

various forms of atomic scattering length and gain/loss terms. In addition we

discuss the nature of various soliton solutions for time dependent potentials

such as oscillatory soliton solution, the phenomena of collapse and revival of

two-soliton like bound state formation of the condensate for doubly periodic

modulation potential and bright and dark solitons for step-wise modulated

potentials.

\\ ( http://arxiv.org/abs/0812.5073 , 3209kb)

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arXiv:0901.0276

Date: Fri, 2 Jan 2009 20:11:31 GMT (57kb)

Title: Electric dipoles at ultralow temperatures

Authors: John L. Bohn

Categories: physics.atom-ph

\\

We briefly introduce the formalism for describing dipolar molecules in an

ultracold gaseous environment. This treatment includes the quantum mechanical

states of the dipoles, the electric fields they produce, and their interactions

with one another.

\\ ( http://arxiv.org/abs/0901.0276 , 57kb)

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arXiv:0901.0348

Date: Sun, 4 Jan 2009 02:31:54 GMT (14kb)

Title: Induced P-wave superfluidity within full energy-momentum dependent

Eliashberg approximation in asymmetric dilute Fermi gases

Authors: Aurel Bulgac and Sukjin Yoon

Categories: cond-mat.stat-mech cond-mat.supr-con

Comments: 4 pages, 1 figure

\\

We consider a very asymmetric system of Fermions with an interaction

characterized by a positive scattering length only. The minority atoms pair and

form a BEC of dimers, while the surplus fermions interact only indirectly

through the exchange of Bogoliubov sound modes. This interaction has a finite

range, the retardation effects are significant and the surplus fermions will

form a P-wave superfluid. We compute the P-wave pairing gap in the BCS and

Eliashberg with only energy dependence approximations, and demonstrate their

inadequacy in comparison with a full treatment of the momentum and energy

dependence of the induced interaction. The pairing gap computed with a full

momentum and energy dependence is significantly larger in magnitude and that

makes it more likely that this new exotic paired phase could be put in evidence

in atomic trap experiments.

\\ ( http://arxiv.org/abs/0901.0348 , 14kb)

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arXiv:0901.0420

Date: Mon, 5 Jan 2009 05:05:13 GMT (153kb)

Title: Numerical study of the hard-core Bose-Hubbard Model on an Infinite

Square Lattice

Authors: Jacob Jordan, Roman Orus, Guifre Vidal

Categories: cond-mat.str-el

Comments: 8 pages, 6 figures

\\

We present a study of the hard-core Bose-Hubbard model at zero temperature on

an infinite square lattice using the infinite Projected Entangled Pair State

algorithm [Jordan et al., Phys. Rev. Lett. 101, 250602 (2008)]. Throughout the

whole phase diagram our values for the ground state energy, particle density

and condensate fraction accurately reproduce those previously obtained by other

methods. We also explore ground state entanglement, compute two-point

correlators and conduct a fidelity-based analysis of the phase diagram.

Furthermore, for illustrative purposes we simulate the response of the system

when a perturbation is suddenly added to the Hamiltonian.

\\ ( http://arxiv.org/abs/0901.0420 , 153kb)

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arXiv:0901.0596

Date: Tue, 6 Jan 2009 06:33:07 GMT (629kb)

Title: Quadrupole Oscillations in Bose-Fermi Mixtures of Ultracold Atomic Gases

made of Yb atoms in the Time-Dependent Gross-Pitaevskii and Vlasov equations

Authors: Tomoyuki Maruyama and Hiroyuki Yabu

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

\\

We study quadrupole collective oscillations in the bose-fermi mixtures of

ultracold atomic gases of Yb isotopes, which are realized by Kyoto group. Three

kinds of combinations are chosen, Yb170-Yb171, Yb170-Yb173 and Yb174-Yb173,

where boson-fermion interactions are weakly repulsive, strongly attractive and

strongly repulsive respectively. Collective oscillations in these mixtures are

calculated in a dynamical time-evolution approach formulated with the

time-dependent Gross-Pitaevskii and the Vlasov equations. The boson

oscillations are shown to have one collective mode, and the fermions are shown

to have the boson-forced and two intrinsic modes, which correspond to the

inside- and outside-fermion oscillations for the boson-distributed regions. In

the case of the weak boson-fermion interactions, the dynamical calculations are

shown to be consistent with the results obtained in the small amplitude

approximations as the random phase approximation in early stage of oscillation,

but, in later stage, these two approaches are shown to give the different

results. Also, in the case of the strong boson-fermion interactions,

discrepancies appear in early stage of oscillation. We also analyze these

differences in two approaches, and show that they originated in the change of

the fermion distributions through oscillation.

\\ ( http://arxiv.org/abs/0901.0596 , 629kb)

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arXiv:0901.0636

Date: Tue, 6 Jan 2009 12:02:22 GMT (153kb)

Title: Cold Bosons in Optical Lattices

Authors: V. I. Yukalov

Categories: cond-mat.stat-mech cond-mat.mes-hall

Comments: Latex file, 211 pages, 3 figures

Journal-ref: Laser Phys. 19 (2009) 1-110

\\

Basic properties of cold Bose atoms in optical lattices are reviewed. The

main principles of correct self-consistent description of arbitrary systems

with Bose-Einstein condensate are formulated. Theoretical methods for

describing regular periodic lattices are presented. A special attention is paid

to the discussion of Bose-atom properties in the frame of the boson Hubbard

model. Optical lattices with arbitrary strong disorder, induced by random

potentials, are treated. Possible applications of cold atoms in optical

lattices are discussed, with an emphasis of their usefulness for quantum

information processing and quantum computing. An important feature of the

present review article, distinguishing it from other review works, is that

theoretical fundamentals here are not just mentioned in brief, but are

thoroughly explained. This makes it easy for the reader to follow the principal

points without the immediate necessity of resorting to numerous publications in

the field.

\\ ( http://arxiv.org/abs/0901.0636 , 153kb)

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arXiv:0901.0545 (*cross-listing*)

Date: Mon, 5 Jan 2009 20:58:08 GMT (299kb)

Title: Coordinate-Space Hartree-Fock-Bogoliubov Description of Superfluid Fermi

Systems

Authors: J.C. Pei, W. Nazarewicz, M. Stoitsov

Categories: nucl-th cond-mat.supr-con

Comments: 4 pages, 2 figures, ENAM 2008 conference proceedings (EPJA)

\\

Properties of strongly interacting, two-component finite Fermi systems are

discussed within the recently developed coordinate-space

Hartree-Fock-Bogoliubov (HFB) code {\hfbax}. Two illustrative examples are

presented: (i) weakly bound deformed Mg isotopes, and (ii) spin-polarized

atomic condensates in a strongly deformed harmonic trap.

\\ ( http://arxiv.org/abs/0901.0545 , 299kb)

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arXiv:0901.0694

Date: Tue, 6 Jan 2009 19:06:03 GMT (222kb)

Title: Independent Control of Scattering Lengths in Multicomponent Quantum

Gases

Authors: Peng Zhang, Pascal Naidon and Masahito Ueda

Categories: physics.atom-ph

Comments: 4pages, 3figures

\\

We develop a method of simultaneous and independent control of different

scattering lengths in ultracold multicomponent atomic gases such as $^{\rm

40}$K, $^{\rm 6}$Li and $^{\rm 40}$K-$^{\rm 6}$Li mixtures. Our method can be

used to engineer multi-component quantum phases and Efimov trimer states.

\\ ( http://arxiv.org/abs/0901.0694 , 222kb)

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arXiv:0901.0812

Date: Wed, 7 Jan 2009 12:17:59 GMT (5kb)

Title: The relevance of random choice in tests of Bell inequalities with atomic

qubits

Authors: Emilio Santos

Categories: quant-ph

\\

It is pointed out that a loophole exists in experimental tests of Bell

inequality using atomic qubits, due to possible errors in the rotation angles

of the atomic states. A sufficient condition is derived for closing the

loophole.

\\ ( http://arxiv.org/abs/0901.0812 , 5kb)

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arXiv:0901.0836

Date: Wed, 7 Jan 2009 15:02:51 GMT (203kb,D)

Title: Efficient routing of single photons by one atom and a microtoroidal

cavity

Authors: Takao Aoki, A. S. Parkins, D. J. Alton, C. A. Regal, Barak Dayan, E.

Ostby, K. J. Vahala, and H. J. Kimble

Categories: quant-ph

\\

Single photons from a coherent input are efficiently redirected to a separate

output by way of a fiber-coupled microtoroidal cavity interacting with

individual Cesium atoms. By operating in an overcoupled regime for the

input-output to a tapered fiber, our system functions as a quantum router with

high efficiency for photon sorting. Single photons are reflected and excess

photons transmitted, as confirmed by observations of photon antibunching

(bunching) for the reflected (transmitted) light. Our photon router is robust

against large variations of atomic position and input power, with the observed

photon antibunching persisting for intracavity photon number 0.03 \lesssim n

\lesssim 0.7.

\\ ( http://arxiv.org/abs/0901.0836 , 203kb)

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arXiv:0901.0844

Date: Wed, 7 Jan 2009 15:10:04 GMT (751kb,D)

Title: Entanglement and nonlocality of a single relativistic particle

Authors: Jacob Dunningham and Vlatko Vedral

Categories: quant-ph

Comments: 4 pages

\\

Recent work has argued that the concepts of entanglement and nonlocality must

be taken seriously even in systems consisting of only a single particle. These

treatments, however, are nonrelativistic and, if single particle entanglement

is fundamental, it should also persist in a relativistic description. Here we

consider a spin-1/2 particle in a superposition of two different velocities as

viewed by an observer in a different relativistically-boosted inertial frame.

We show that the entanglement survives right up to the speed of light and that

the boosted observer would see single-particle violations of Bell's inequality.

We also discuss how quantum gates could be implemented in this way and the

possible implications for quantum information processing.

\\ ( http://arxiv.org/abs/0901.0844 , 751kb)

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arXiv:0901.0939

Date: Wed, 7 Jan 2009 22:07:05 GMT (969kb)

Title: Collapses and revivals of stored orbital angular momentum of light in a

cold atomic ensemble

Authors: D. Moretti, D. Felinto, and J. W. R. Tabosa

Categories: quant-ph

Comments: Submitted to Physical Review A

\\

We report on the storage of orbital angular momentum of light in a cold

ensemble of cesium atoms. We employ Bragg diffraction to retrieve the stored

optical information impressed into the atomic coherence by the incident light

fields. The stored information can be manipulated by an applied magnetic field

and we were able to observe collapses and revivals due to the rotation of the

stored atomic Zeeman coherence for times longer than 15 $\mu s$.

\\ ( http://arxiv.org/abs/0901.0939 , 969kb)

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arXiv:0901.0983

Date: Thu, 8 Jan 2009 19:51:49 GMT (76kb,D)

Title: Grand-mother clocks and quiet lasers

Authors: Jacques Arnaud (IES), Laurent Chusseau (IES), Fabrice Philippe (LIRMM)

Categories: quant-ph

Comments: 7 pages

\\

Galileo noted in the 16th century that the period of oscillation of a

pendulum is almost independent of the amplitude. However, such a pendulum is

damped by air friction. The latter may be viewed as resulting from air

molecules getting in contact with the pendulum. It follows that air friction,

not only damps the oscillation, but also introduces randomness. In the

so-called ``grand-mother'' clock, discovered by Huygens in the 18th century,

damping is compensated for, on the average, by an escapement mechanism driven

by a falling weight. The purpose of this paper is to show that such a clock is,

in its idealized form, a quiet oscillator. By ``quiet'' we mean that in spite

of the randomness introduced by damping, the dissipated power (viewed as the

oscillator output) does not fluctuate slowly. Comparison is made with quiet

laser oscillators discovered theoretically in 1984. Because the input power

does not fluctuate in both the mechanical oscillator and the quiet laser

oscillator, the output power does not fluctuate at small Fourier frequencies,

irrespectively of the detailed mechanisms involved.

\\ ( http://arxiv.org/abs/0901.0983 , 76kb)

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The replacements:

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arXiv:cond-mat/0607433

replaced with revised version Wed, 31 Dec 2008 22:18:02 GMT (76kb)

Title: Coherent Collective Excitations in a Superfluid: Spontaneously Broken

Symmetries and Fluctuations-Dissipation

Authors: S.J. Han

Categories: cond-mat.other

Comments: 84 pages, 1 figure

\\ ( http://arxiv.org/abs/cond-mat/0607433 , 76kb)

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arXiv:0809.1999

replaced with revised version Wed, 31 Dec 2008 10:38:57 GMT (340kb)

Title: Optimal geometry for efficient loading of an optical dipole trap

Authors: Andrzej Szczepkowicz, Leszek Krzemien, Adam Wojciechowski, Krzysztof

Brzozowski, Michael Kruger, Michal Zawada, Marcin Witkowski, Jerzy

Zachorowski, Wojciech Gawlik

Categories: physics.atom-ph

Comments: 6 figures. Phys. Rev. A, in press

\\ ( http://arxiv.org/abs/0809.1999 , 340kb)

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arXiv:0803.2382

replaced with revised version Wed, 31 Dec 2008 19:50:03 GMT (32kb)

Title: Comment on "Using Three-Body Recombination to Extract Electron

Temperatures of Ultracold Plasmas"

Authors: Yurii V. Dumin (Max Planck Institute for the Physics of Complex

Systems, Dresden, Germany)

Categories: physics.space-ph physics.atom-ph physics.plasm-ph

Comments: Main article: Dumin.tex (REVTeX4, 1 page); supplementary material:

figures_Dumin.pdf (Adobe PDF, 1 page, should be extracted from the submission

package separately). Ver.2: Supplementary material added, minor stylistic

changes in the main article. Submitted to Phys. Rev. Lett. (2008)

\\ ( http://arxiv.org/abs/0803.2382 , 32kb)

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arXiv:0811.0397

replaced with revised version Mon, 5 Jan 2009 16:10:24 GMT (273kb)

Title: Sign-Alternating Interaction Mediated by Strongly-Correlated Lattice

Bosons

Authors: \c{S}.G. S\"oyler, B. Capogrosso-Sansone, N.V. Prokof'ev, B.V.

Svistunov

Categories: cond-mat.other cond-mat.stat-mech

Comments: 4 pages, 2 figures. Title, abstract and introductory part are

rewritten. Some technical details are removed

\\ ( http://arxiv.org/abs/0811.0397 , 273kb)

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arXiv:0809.0993

replaced with revised version Tue, 6 Jan 2009 05:39:56 GMT (805kb,D)

Title: Vortex waves in trapped Bose-Einstein condensates

Authors: T. P. Simula, T. Mizushima, and K. Machida

Categories: cond-mat.other

Comments: minor changes, 7 pages, 7 figures

Journal-ref: Phys. Rev. A 78, 053604 (2008)

DOI: 10.1103/PhysRevA.78.053604

\\ ( http://arxiv.org/abs/0809.0993 , 805kb)

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arXiv:0808.0666

replaced with revised version Wed, 7 Jan 2009 13:02:35 GMT (33kb)

Title: Density Matrix Renormalization Group in the Heisenberg Picture

Authors: Michael J. Hartmann, Javier Prior, Stephen R. Clark and Martin B.

Plenio

Categories: cond-mat.str-el cond-mat.other quant-ph

Comments: version to appear in PRL, acronyms in title and abstract expanded,

new improved numerical examples

\\ ( http://arxiv.org/abs/0808.0666 , 33kb)

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arXiv:0806.2125 (*cross-listing*)

replaced with revised version Tue, 6 Jan 2009 23:06:37 GMT (1377kb)

Title: An Atomic Gravitational Wave Interferometric Sensor (AGIS)

Authors: Savas Dimopoulos, Peter W. Graham, Jason M. Hogan, Mark A. Kasevich,

Surjeet Rajendran

Categories: gr-qc astro-ph hep-ph hep-th physics.atom-ph

Comments: 41 pages, 19 figures; v2: revised version as in Phys. Rev. D

Journal-ref: Phys.Rev.D78:122002,2008

DOI: 10.1103/PhysRevD.78.122002

\\ ( http://arxiv.org/abs/0806.2125 , 1377kb)

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arXiv:0806.3877

replaced with revised version Thu, 8 Jan 2009 15:48:15 GMT (844kb,D)

Title: Optimizing number squeezing when splitting a mesoscopic condensate

Authors: Julian Grond, Joerg Schmiedmayer, Ulrich Hohenester

Categories: cond-mat.other

Comments: 4 pages, v2: revised version. To appear in Phys. Rev. A Rapid

Communications

\\ ( http://arxiv.org/abs/0806.3877 , 844kb)

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arXiv:0808.1957

replaced with revised version Thu, 8 Jan 2009 06:52:15 GMT (248kb)

Title: Relationship between spin squeezing and single-particle coherence in

two-component Bose-Einstein condensates with Josephson coupling

Authors: G. R. Jin and C. K. Law

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

Comments: 4 figures, revtex4, new refs. are added

Journal-ref: Phys. Rev. A 78, 063620 (2008)

DOI: 10.1103/PhysRevA.78.063620

\\ ( http://arxiv.org/abs/0808.1957 , 248kb)

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arXiv:0808.3891

replaced with revised version Thu, 8 Jan 2009 11:47:56 GMT (673kb)

Title: Coupled two-component atomic gas in an optical lattice

Authors: Jonas Larson, Jani-Petri Martikainen

Categories: cond-mat.other quant-ph

Comments: 10 pages, 7 figures

Journal-ref: Phys. Rev. A, 78, 063618 (2008)

DOI: 10.1103/PhysRevA.78.063618

\\ ( http://arxiv.org/abs/0808.3891 , 673kb)

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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 =========================================================================Received on Fri May 01 2009 - 15:51:03 EST

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