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

Date: Sat, 05 Sep 2009 19:40:53 +1000

Date: Sat, 05 Sep 2009 19:40:53 +1000

Dear subscribers,

Jacopo Sabbatini compiled this week's collection. There are 19 new abstracts

and 4 replacements:

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arXiv:0907.0483

Date: Thu, 2 Jul 2009 21:54:50 GMT (501kb)

Title: Dynamic response of 1D bosons in a trap

Authors: Vitaly N. Golovach, Anna Minguzzi and Leonid I. Glazman

Categories: cond-mat.quant-gas cond-mat.mes-hall

Comments: 24 pages, 11 figures

\\

We calculate the dynamic structure factor S(q,omega) of a one-dimensional

(1D) interacting Bose gas confined in a harmonic trap. The effective

interaction depends on the strength of the confinement enforcing the 1D motion

of atoms; interaction may be further enhanced by superimposing an optical

lattice on the trap potential. In the compressible state, we find that the

smooth variation of the gas density around the trap center leads to softening

of the singular behavior of S(q,omega) at Lieb-1 mode compared to the behavior

predicted for homogeneous 1D systems. Nevertheless, the density-averaged

response remains a non-analytic function of q and omega at Lieb-1 mode in the

limit of weak trap confinement. The exponent of the power-law non-analyticity

is modified due to the inhomogeneity in a universal way, and thus, bears

unambiguously the information about the (homogeneous) Lieb-Liniger model. A

strong optical lattice causes formation of Mott phases. Deep in the Mott

regime, we predict a semi-circular peak in S(q,\omega) centered at the on-site

repulsion energy, omega=U. Similar peaks of smaller amplitudes exist at

multiples of U as well. We explain the suppression of the dynamic response with

entering into the Mott regime, observed recently by D. Clement et al., Phys.

Rev. Lett. v. 102, p. 155301 (2009), based on an f-sum rule for the

Bose-Hubbard model.

\\ ( http://arxiv.org/abs/0907.0483 , 501kb)

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arXiv:0907.0564

Date: Fri, 3 Jul 2009 08:54:23 GMT (2338kb,D)

Title: Vortex nucleation in mesoscopic Bose superfluid and breaking of the

parity symmetry

Authors: D. Dagnino, N. Barber\'an, and M. Lewenstein

Categories: cond-mat.quant-gas

Comments: 14 pages, 27 figures

\\

We analyze vortex nucleation in mezoscopic 2D Bose superfluid in a rotating

trap. We explicitly include a weakly anisotropic stirring potential, breaking

thus explicitly the axial symmetry. As the rotation frequency passes the

critical value $\Omega_c$ the system undergoes an extra symmetry

change/breaking. Well below $\Omega_c$ the ground state is properly described

by the mean field theory with an even condensate wave function. Well above

$\Omega_c$ the MF solution works also well, but the order parameter becomes

odd. This phenomenon involves therefore a discrete parity symmetry breaking. In

the critical region the MF solutions exhibit dynamical instability. The true

many body state is a strongly correlated entangled state involving two

macroscopically occupied modes (eigenstates of the single particle density

operator). We characterize this state in various aspects: i) the eligibility

for adiabatic evolution; ii) its analytical approximation given by the

maximally entangled combination of two single modes; and finally iii) its

appearance in particle detection measurements.

\\ ( http://arxiv.org/abs/0907.0564 , 2338kb)

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arXiv:0907.0621

Date: Fri, 3 Jul 2009 12:46:06 GMT (75kb)

Title: Critical velocity of superfluid flow through single barrier and periodic

potentials

Authors: Gentaro Watanabe, F. Dalfovo, F. Piazza, L. P. Pitaevskii, S.

Stringari

Categories: cond-mat.quant-gas cond-mat.supr-con

Comments: 10 pages, 6 figures

\\

We investigate the problem of an ultracold atomic gas in the superfluid phase

flowing in the presence of a potential barrier or a periodic potential. We use

a hydrodynamic scheme in the local density approximation (LDA) to obtain an

analytic expression for the critical current as a function of the barrier

height or the lattice intensity, which applies to both Bose and Fermi

superfluids. In this scheme, the stationary flow becomes energetically unstable

when the local superfluid velocity is equal to the local sound velocity at the

point where the external potential is maximum. We compare this prediction with

the results of the numerical solutions of the Gross-Pitaevskii and

Bogoliubov-de Gennes equations. We discuss the role of long wavelength

excitations in determining the critical velocity. Our results allow one to

identify the different regimes of superfluid flow, namely, the LDA hydrodynamic

regime, the regime of quantum effects beyond LDA for weak barriers and the

regime of tunnelling between weakly coupled superfluids for strong barriers. We

finally discuss the relevance of these results in the context of current

experiments with ultracold gases.

\\ ( http://arxiv.org/abs/0907.0621 , 75kb)

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arXiv:0907.0625

Date: Fri, 3 Jul 2009 12:59:56 GMT (769kb)

Title: Dark solitons near the Mott-insulator--superfluid phase transition

Authors: K.V.Krutitsky, J.Larson, M.Lewenstein

Categories: cond-mat.quant-gas

\\

Dark solitons of ultracold bosons in the vicinity of the

Mott-insulator--superfluid phase transition are studied. Making use of the

Gutzwiller ansatz we have found antisymmetric eigenstates corresponding to

standing solitons, as well as propagating solitons created by phase imprinting.

The properties of both types of solitons are studies and in particular it is

demonstrate that quantum fluctuations greatly affect the characteristics of the

solitons.

\\ ( http://arxiv.org/abs/0907.0625 , 769kb)

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arXiv:0907.0652

Date: Fri, 3 Jul 2009 15:06:06 GMT (244kb)

Title: Antiferromagnetic noise correlations in optical lattices

Authors: G. M. Bruun, O. F. Syljuasen, K. G. L. Pedersen, B. M. Andersen, E.

Demler, A. S. Sorensen

Categories: cond-mat.quant-gas

Comments: 4 pages, 4 figures

\\

We analyze how noise correlations probed by time-of-flight (TOF) experiments

reveal antiferromagnetic (AF) correlations of fermionic atoms in

two-dimensional (2D) and three-dimensional (3D) optical lattices. Combining

analytical and quantum Monte Carlo (QMC) calculations using experimentally

realistic parameters, we show that AF correlations can be detected for

temperatures above and below the critical temperature for AF ordering. It is

demonstrated that spin-resolved noise correlations yield important information

about the spin ordering. Finally, we show how to extract the spin correlation

length and the related critical exponent of the AF transition from the noise.

\\ ( http://arxiv.org/abs/0907.0652 , 244kb)

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arXiv:0907.0674

Date: Fri, 3 Jul 2009 17:11:31 GMT (644kb)

Title: Single-atom-sensitive fluorescence imaging of ultracold quantum gases

Authors: R. B\"ucker, A. Perrin, S. Manz, T. Betz, Ch. Koller, T. Plisson, J.

Rottmann, T. Schumm, and J. Schmiedmayer

Categories: physics.atom-ph

Comments: 23 pages, 10 figures

\\

We present a novel imaging system for ultracold quantum gases in expansion.

After release from a confining potential, atoms fall through a sheet of

resonant excitation laser light and the emitted fluorescence photons are imaged

onto an amplified CCD camera using a high numerical aperture optical system.

The imaging system reaches an extraordinary dynamic range, not attainable with

conventional absorption imaging. We demonstrate single-atom detection for

dilute atomic clouds with high efficiency where at the same time dense

Bose-Einstein condensates can be imaged without saturation or distortion. The

spatial resolution can reach the sampling limit as given by the 8 microns pixel

size in object space. Pulsed operation of the detector allows for slice images

and hence a 3D tomography of the measured object. The scheme can easily be

implemented for any atomic species and all optical components are situated

outside the vacuum system. As a first application we perform thermometry on

rubidium Bose-Einstein condensates created on an atom chip.

\\ ( http://arxiv.org/abs/0907.0674 , 644kb)

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arXiv:0907.0720

Date: Fri, 3 Jul 2009 21:14:51 GMT (38kb)

Title: Semiclassical dynamics of atomic Bose-Einstein condensates

Authors: S. Choi and B. Sundaram

Categories: cond-mat.quant-gas

Comments: 4 figures. Submitted for publication

\\

An atomic Bose-Einstein condensate (BEC) is often described as a macroscopic

object which can be approximated by a coherent state. This, on the surface,

would appear to indicate that its behavior should be close to being classical.

In this paper, we clarify the extent of how ``classical'' a BEC is by exploring

the semiclassical equations for BECs under the mean field Gaussian

approximation. Such equations describe the dynamics of a condensate in the

classical limit in terms of the variables < x > and < p > as well as their

respective variances. We compare the semiclassical solution with the full

quantum solution based on the Gross-Pitaevskii Equation (GPE) and find that the

interatomic interactions which generate nonlinearity make the system less

``classical.'' On the other hand, many qualitative features are captured by the

semiclassical equations, and the equations to be solved are far less

computationally intensive than solving the GPE which make them ideal for

providing quick diagnostics, and for obtaining new intuitive insight.

\\ ( http://arxiv.org/abs/0907.0720 , 38kb)

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arXiv:0907.1025

Date: Mon, 6 Jul 2009 15:52:48 GMT (133kb)

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

\\

Temporal coherence is a fundamental property of macroscopic quantum systems,

such as lasers in optics and Bose-Einstein condensates in atomic gases and it

is a crucial issue for interferometry applications with light or matter waves.

Whereas the laser is an "open" quantum system, ultracold atomic gases are

weakly coupled to the environment and may be considered as isolated. The

coherence time of a condensate is then intrinsic to the system and its

derivation is out of the frame of laser theory. Using quantum kinetic theory,

we predict that the interaction with non-condensed modes gradually smears out

the condensate phase, with a variance growing as A t^2+B t+C at long times t,

and we give a quantitative prediction for A, B and C. Whereas the coefficient A

vanishes for vanishing energy fluctuations in the initial state, the

coefficients B and C are remarkably insensitive to these fluctuations. The

coefficient B describes a diffusive motion of the condensate phase that sets

the ultimate limit to the condensate coherence time. We briefly discuss the

possibility to observe the predicted phase spreading, also including the effect

of particle losses.

\\ ( http://arxiv.org/abs/0907.1025 , 133kb)

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arXiv:0907.1096

Date: Mon, 6 Jul 2009 20:23:22 GMT (106kb)

Title: Two-dimensional boson-fermion mixtures

Authors: A. L. Subasi, S. Sevincli, P. Vignolo, B. Tanatar

Categories: cond-mat.quant-gas

Comments: 9 pages, 4 figures

Journal-ref: Phys. Rev. A 79, 063632 (2009)

DOI: 10.1103/PhysRevA.79.063632

\\

Using mean-field theory, we study the equilibrium properties of boson-fermion

mixtures confined in a harmonic pancake-shaped trap at zero temperature. When

the modulus of the s-wave scattering lengths are comparable to the mixture

thickness, two-dimensional scattering events introduce a logarithmic dependence

on density in the coupling constants, greatly modifying the density profiles

themselves. We show that for the case of a negative boson-fermion

three-dimensional s-wave scattering length, the dimensional crossover

stabilizes the mixture against collapse and drives it towards spatial demixing.

\\ ( http://arxiv.org/abs/0907.1096 , 106kb)

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arXiv:0907.1200

Date: Tue, 7 Jul 2009 12:33:10 GMT (60kb)

Title: Probing the quantum ground state of a spin-1 Bose-Einstein condensate

with cavity transmission spectra

Authors: J. M. Zhang, S. Cui, H. Jing, D. L. Zhou, and W. M. Liu

Categories: cond-mat.quant-gas quant-ph

Comments: 6 pages, 1 figure

\\

We propose to probe the quantum ground state of a spin-1 Bose-Einstein

condensate with the transmission spectra of an optical cavity. By choosing a

circularly polarized cavity mode with an appropriate frequency, we can realize

coupling between the cavity mode and the magnetization of the condensate. The

cavity transmission spectra then contain information of the magnetization

statistics of the condensate and thus can be used to distinguish the

ferromagnetic and antiferromagnetic quantum ground states. This technique may

also be useful for continuous observation of the spin dynamics of a spinor

Bose-Einstein condensate.

\\ ( http://arxiv.org/abs/0907.1200 , 60kb)

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arXiv:0907.1248

Date: Tue, 7 Jul 2009 16:10:16 GMT (86kb)

Title: Generalized nonpolynomial Schrodinger equations for matter waves under

anisotropic transverse confinement

Authors: Luca Salasnich

Categories: cond-mat.quant-gas

Comments: 9 pages, 2 figures, to be published in Journal of Physics A: Math.

Theor

\\

Starting from the three-dimensional Gross-Pitaevskii equation we derive a 1D

generalized nonpolynomial Schrodinger equation, which describes the dynamics of

Bose-Einstein condensates under the action of a generic potential in the

longitudinal axial direction and of an anisotropic harmonic potential in the

transverse radial direction. This equation reduces to the familiar 1D

nonpolynomial Schrodinger equation [Phys. Rev. A 65, 043614 (2002)] in the case

of isotropic transverse harmonic confinement. In addition, we show that if the

longitudinal potential models a periodic optical lattice the 3D GPE can be

mapped into a 1D generalized discrete nonpolynomial Schrodinger equation.

\\ ( http://arxiv.org/abs/0907.1248 , 86kb)

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arXiv:0907.1258

Date: Tue, 7 Jul 2009 17:01:06 GMT (164kb)

Title: Supersolid and solitonic phases in one-dimensional Extended Bose-Hubbard

model

Authors: Tapan Mishra, Ramesh V. Pai, S. Ramanan, Meetu Sethi Luthra and B. P.

Das

Categories: cond-mat.quant-gas cond-mat.other

Comments: 7 pages, 11 figures

\\

We report our findings on quantum phase transitions in cold bosonic atoms in

a one dimensional optical lattice using the finite size density matrix

renormalization group method in the framework of the extended Bose-Hubbard

model. We consider wide ranges of values for the filling factors and the

nearest neighbor interactions. At commensurate fillings, we obtain two

different types of charge density wave phases and a Mott insulator phase.

However, departure from commensurate fillings yield the exotic supersolid phase

where both the crystalline and the superfluid orders coexist. In addition, we

obtain signatures for solitary waves and also superfluidity.

\\ ( http://arxiv.org/abs/0907.1258 , 164kb)

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arXiv:0907.1323

Date: Wed, 8 Jul 2009 01:33:30 GMT (818kb,D)

Title: Versatile transporter apparatus for experiments with optically trapped

Bose-Einstein condensates

Authors: Daniel Pertot, Daniel Greif, Stephan Albert, Bryce Gadway, Dominik

Schneble

Categories: cond-mat.quant-gas

\\

We describe a versatile and simple scheme for producing magnetically and

optically-trapped Rb-87 Bose-Einstein condensates, based on a moving-coil

transporter apparatus. The apparatus features a TOP trap that incorporates the

movable quadrupole coils used for magneto-optical trapping and long-distance

magnetic transport of atomic clouds. As a stand-alone device, this trap allows

for the stable production of condensates containing up to one million atoms. In

combination with an optical dipole trap, the TOP trap acts as a funnel for

efficient loading, after which the quadrupole coils can be retracted, thereby

maximizing optical access. The robustness of this scheme is illustrated by

realizing the superfluid-to-Mott insulator transition in a three-dimensional

optical lattice.

\\ ( http://arxiv.org/abs/0907.1323 , 818kb)

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arXiv:0907.1332

Date: Wed, 8 Jul 2009 03:11:59 GMT (1458kb)

Title: Many-body physics in the radio frequency spectrum of lattice bosons

Authors: Kaden R. A. Hazzard, Erich J. Mueller (Cornell)

Categories: cond-mat.quant-gas

Comments: 6 pages, 4 figures, 13 subfigures

\\

We calculate the radio-frequency spectrum of a trapped cloud of cold bosonic

atoms in an optical lattice. Using random phase and local density

approximations we produce both trap averaged and spatially resolved spectra,

identifying simple features in the spectra that reveal information about both

superfluidity and correlations. Our approach is exact in the deep Mott limit

and in the deep superfluid when the hopping rates for the two internal spin

states are equal. It contains final state interactions, obeys the Ward

identities (and the associated conservation laws), and satisfies the $f$-sum

rule. Motivated by earlier work by Sun, Lannert, and Vishveshwara [Phys. Rev. A

\textbf{79}, 043422 (2009)], we also discuss the features which arise in a

spin-dependent optical lattice.

\\ ( http://arxiv.org/abs/0907.1332 , 1458kb)

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arXiv:0907.1345

Date: Thu, 9 Jul 2009 19:50:30 GMT (296kb)

Title: Ferro-Nematic ground state of the dilute dipolar Fermi gas

Authors: Benjamin M. Fregoso and Eduardo Fradkin

Categories: cond-mat.quant-gas cond-mat.str-el

Comments: 4 pages, 3 figures; minor misprints corrected

\\

We show using a ``Thomas-Fermi'' variational wave function with a

distribution function in momentum space, that a homogeneous two-component Fermi

gas with dipolar interactions has a ferro-nematic ground state for non-zero

(arbitrarily small) values of the dipolar coupling constant. The ferro-nematic

phase is characterized by having a non-zero magnetization and long range

orientational uniaxial order. The Fermi surface of spin up (down) component is

elongated (compressed) along the direction of the magnetization. We calculate

several thermodynamic quantities and discuss the prospects of experimental

realizations.

\\ ( http://arxiv.org/abs/0907.1345 , 296kb)

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arXiv:0907.1382

Date: Wed, 8 Jul 2009 10:30:11 GMT (115kb)

Title: Phase diagrams of the Bose-Hubbard model at finite temperature

Authors: I.V. Stasyuk and T.S. Mysakovych

Categories: cond-mat.other

\\

The phase transitions in the Bose-Hubbard model are investigated. A

single-particle Green's function is calculated in the random phase

approximation and the formalism of the Hubbard operators is used. The regions

of existence of the superfluid and Mott insulator phases are established and

the $(\mu,t)$ (the chemical potential -- transfer parameter) phase diagrams are

built. The influence of temperature change on this transition is analyzed and

the phase diagram in the $(T,\mu)$ plane is constructed. The role of thermal

activation of the ion hopping is investigated by taking into account the

temperature dependence of the transfer parameter. The reconstruction of the

Mott-insulator lobes due to this effect is analyzed.

\\ ( http://arxiv.org/abs/0907.1382 , 115kb)

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arXiv:0907.1533

Date: Thu, 9 Jul 2009 13:13:49 GMT (200kb)

Title: Luttinger liquid of trimers in Fermi gases with unequal masses

Authors: Giuliano Orso, Evgeni Burovski, and Thierry Jolicoeur

Categories: cond-mat.quant-gas cond-mat.supr-con

Comments: 4+ pages,4 figures

\\

We investigate one dimensional attractive Fermi gases in spin-dependent

optical lattices. Starting from the asymmetric Hubbard model, we show that

three-body bound states - ``trimers'' - exist as soon as the two tunneling

rates are different. We calculate the binding energy and the effective mass of

a single trimer. We then show numerically that for finite commensurate

densities $n_\uparrow=n_\downarrow/2$ an energy gap appears, implying that the

gas is a one-component Luttinger liquid of trimers with suppressed superfluid

ordering. The boundaries of this exotic phase are given.

\\ ( http://arxiv.org/abs/0907.1533 , 200kb)

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arXiv:0907.1584

Date: Thu, 9 Jul 2009 15:26:55 GMT (161kb)

Title: Observation of stable 3-vortex/anti-vortex clusters in a superfluid

Bose-Einstein condensate

Authors: J. A. Seman, E. A. L. Henn, R. F. Shiozaki, E. R. F. Ramos, M.

Caracanhas, C. Castelo Branco, G. Roati, M. Haque, K. M. F. Magalh\~aes and

V. S. Bagnato

Categories: cond-mat.quant-gas

Comments: 4 pages, 4 figures

\\

We report on the observation of stable configurations of clusters with three

vortices in a Rb87 Bose-Einstein condensate. We observe preferentially two

types of 3-vortex/anti-vortex configurations. Vortices are either distributed

as an equilateral triangle or as a liner array. The results are consistent with

the theory where the triangular configuration is formed by vortices with the

same circulation sign, while, in contrast, the linear array is constituted of a

central vortex with a sign of circulation opposite to the side ones.

\\ ( http://arxiv.org/abs/0907.1584 , 161kb)

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arXiv:0907.1333

Date: Wed, 8 Jul 2009 03:48:44 GMT (672kb)

Title: Demonstrating mesoscopic superpositions in double-well Bose-Einstein

condensates

Authors: T.J. Haigh, A.J. Ferris, M.K. Olsen

Categories: quant-ph

Comments: 14 pages, 8 figures

\\

The availability of Bose-Einstein condensates as mesoscopic or macroscopic

quantum objects has aroused new interest in the possiblity of making and

detecting coherent superpositions involving many atoms. In this article we show

that it may be possible to generate such a superposition state in a reasonably

short time using Feshbach resonances to tune the inter-atomic interactions in a

double-well condensate.

We also consider the important problem of distinguishing whether a coherent

superposition or a statistical mixture is generated by a given experimental

procedure. We find that unambiguously distinguishing even a perfect `NOON'

state from a statistical mixture using standard detection methods will present

experimental difficulties.

\\ ( http://arxiv.org/abs/0907.1333 , 672kb)

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The replacements:

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arXiv:0808.0636

replaced with revised version Fri, 3 Jul 2009 13:22:24 GMT (1609kb)

Title: A method to create disordered vortex arrays in atomic Bose-Einstein

condensates

Authors: Eniko J. M. Madarassy

Categories: cond-mat.other

Comments: 17 pages, 12 figures. Accepted by the Canadian Journal of Physics

\\ ( http://arxiv.org/abs/0808.0636 , 1609kb)

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arXiv:0812.1926

replaced with revised version Mon, 6 Jul 2009 09:39:42 GMT (388kb)

Title: The Stochastic Gross-Pitaevskii Equation and some Applications

Authors: S. P. Cockburn, N. P. Proukakis

Categories: cond-mat.other

Comments: 14 pages, 9 figures. Corrected typos

Journal-ref: Laser Physics, 2009, Vol. 19, No. 4 (Special Issue on Physics of

Cold Trapped Atoms)

\\ ( http://arxiv.org/abs/0812.1926 , 388kb)

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arXiv:0904.0050

replaced with revised version Sun, 5 Jul 2009 09:37:23 GMT (29kb,D)

Title: Rigorous Upper Bound on the Critical Temperature of Dilute Bose Gases

Authors: Robert Seiringer, Daniel Ueltschi

Categories: cond-mat.stat-mech cond-mat.quant-gas math-ph math.MP

Comments: 10 pages, 2 figures

Journal-ref: Phys. Rev. B 80, 014502 (2009)

DOI: 10.1103/PhysRevB.80.014502

\\ ( http://arxiv.org/abs/0904.0050 , 29kb)

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arXiv:0812.1496

replaced with revised version Thu, 9 Jul 2009 18:29:39 GMT (3891kb)

Title: Feshbach Resonances in Ultracold Gases

Authors: Cheng Chin, Rudolf Grimm, Paul Julienne, and Eite Tiesinga

Categories: cond-mat.other

Comments: Review article, 63 pages, 48 figures

\\ ( http://arxiv.org/abs/0812.1496 , 3891kb)

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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 Thu Sep 24 2009 - 15:47:36 EST

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