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

Date: Sun, 20 Sep 2009 10:14:22 +1000

Date: Sun, 20 Sep 2009 10:14:22 +1000

Dear subscribers,

This instalment is coming to you from Singapore airport. Geoff Lee compiled

this week's abstracts, of which 14 are new and 14 are replacements:

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arXiv:0908.1002

Date: Fri, 7 Aug 2009 08:33:28 GMT (16kb)

Title: Temperature dependence of critical velocities and long time decay of

supercurrents

Authors: Yongle Yu

Categories: cond-mat.supr-con

Comments: 3 pages, 3 figures

\\

We show that a microscopic theory of superfluidity, based on the properties

of the many-body spectrum of a superfluid, can explain naturally the

temperature dependence of critical velocities and the long time decay of

supercurrents.

\\ ( http://arxiv.org/abs/0908.1002 , 16kb)

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arXiv:0908.1009

Date: Fri, 7 Aug 2009 12:05:16 GMT (1337kb)

Title: Phonon instability and self-organized structures in multi-layer stacks

of confined dipolar Bose-Einstein condensates in optical lattices

Authors: Patrick K\"oberle, G\"unter Wunner

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

Comments: 5 pages, 5 figures

\\

In calculations to date [1,2] of multi-layer stacks of dipolar condensates,

created in one-dimensional optical lattices, the condensates have been assumed

to be two-dimensional. In a real experiment, however, the condensates do not

extend to infinity in the oblate direction, but have to be confined by a trap

potential, too. By three-dimensional numerical simulations of this realistic

experimental situation we find a crucial dependence of the phonon instability

boundary on the number of layers. Moreover, near the boundary of the phonon

instability, a variety of structured ground-state wave functions emerges, which

may indicate the onset of a roton instability [3,4].

\\ ( http://arxiv.org/abs/0908.1009 , 1337kb)

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arXiv:0908.1073

Date: Fri, 7 Aug 2009 15:29:05 GMT (42kb)

Title: Universal scaling in a trapped Fermi super-fluid in the BCS-unitarity

crossover

Authors: Sadhan K. Adhikari

Categories: cond-mat.quant-gas

Comments: 4 pages, 4 figures

\\

Using numerical simulation based on a density-functional equation for a

trapped Fermi super-fluid valid along the BCS-unitarity crossover, we establish

robust scaling over many orders of magnitude in the observables of the system

as a function of fermion number. This scaling allows to predict the static

properties of the system, such as energy, chemical potential, etc., for a large

number of fermions, over the crossover, from the knowledge of those for a small

number ($\sim 4-10$) of fermions.

\\ ( http://arxiv.org/abs/0908.1073 , 42kb)

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arXiv:0908.1101

Date: Fri, 7 Aug 2009 19:07:45 GMT (422kb)

Title: Collisional Stability of 40K Immersed in a Strongly Interacting Fermi

Gas of 6Li

Authors: F. M. Spiegelhalder, A. Trenkwalder, D. Naik, G. Hendl, F. Schreck, R.

Grimm

Categories: cond-mat.quant-gas

Comments: 4 pages, 4 figures

\\

We investigate the collisional stability of a sample of 40K atoms immersed in

a tunable spin mixture of 6Li atoms. For large negative scattering lengths

between the two 6Li spin states, we measure very low loss rates and demonstrate

the all-optical preparation of a double-degenerate Fermi-Fermi mixture. For a

strongly interacting 6Li Fermi gas with resonant interactions, we find

sufficient collisional stability for interspecies thermalization.

\\ ( http://arxiv.org/abs/0908.1101 , 422kb)

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arXiv:0908.1151

Date: Sat, 8 Aug 2009 06:28:57 GMT (1146kb,D)

Title: Stability and collapse of localized solutions of the controlled

three-dimensional Gross-Pitaevskii equation

Authors: Renato Fedele, Dusan Jovanovic, Bengt Eliasson, Sergio De Nicola,

Padma Kant Shukla

Categories: cond-mat.quant-gas

Comments: 21 pages, 14 figures

\\

On the basis of recent investigations, a newly developed analytical procedure

is used for constructing a wide class of localized solutions of the controlled

three-dimensional (3D) Gross-Pitaevskii equation (GPE) that governs the

dynamics of Bose-Einstein condensates (BECs). The controlled 3D GPE is

decomposed into a two-dimensional (2D) linear Schr\"{o}dinger equation and a

one-dimensional (1D) nonlinear Schr\"{o}dinger equation, constrained by a

variational condition for the controlling potential. Then, the above class of

localized solutions are constructed as the product of the solutions of the

transverse and longitudinal equations. On the basis of these exact 3D

analytical solutions, a stability analysis is carried out, focusing our

attention on the physical conditions for having collapsing or non-collapsing

solutions.

\\ ( http://arxiv.org/abs/0908.1151 , 1146kb)

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arXiv:0908.1182

Date: Sat, 8 Aug 2009 18:57:16 GMT (2859kb)

Title: Disordered insulator in an optical lattice

Authors: M. Pasienski, D. McKay, M. White, and B. DeMarco

Categories: cond-mat.quant-gas cond-mat.dis-nn

\\

Disorder can profoundly affect the transport properties of a wide range of

quantum materials. For example, the superfluid transition temperature for

helium is strongly modified when it is adsorbed in porous media, and

understanding how disorder affects the emergence of high-temperature

superconductivity is a problem with critical implications for both practical

applications and fundamental condensed matter physics. Presently, there is

significant disagreement regarding the effect of disorder on transport in the

disordered Bose-Hubbard (DBH) model--the paradigm used to theoretically study

disorder in strongly correlated bosonic systems. We experimentally realize the

DBH model by using optical speckle to introduce precisely known, controllable,

and fine-grained disorder to an optical lattice. Here, we show that disorder

can induce a SF-to-insulator (IN) transition in this system, but we find no

evidence for a disorder-generated IN-to-SF transition, in conflict with certain

theoretical predictions. We find that the transition to an IN is marked by

changes in both the quasimomentum distribution and the dissipation strength for

transport. We probe the quasimomentum distribution using time-of-flight (TOF)

imaging, and the transport properties by measuring the motion of the

centre-of-mass (COM) of the atom gas immediately after an applied impulse. By

correlating these measurements, we determine that the transition from a SF to

an IN is associated with the complete destruction of the condensate by disorder

and the emergence of a localized state. We find that increasing disorder

strength generically leads to greater dissipation in the regime of mixed SF and

Mott-insulator (MI) phases, ruling out theories that predict a disorder-induced

MI-to-SF transition for this system.

\\ ( http://arxiv.org/abs/0908.1182 , 2859kb)

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arXiv:0908.1343

Date: Mon, 10 Aug 2009 15:56:24 GMT (30kb)

Title: Polaron to molecule transition in a strongly imbalanced Fermi gas

Authors: M. Punk, P.T. Dumitrescu, W. Zwerger

Categories: cond-mat.quant-gas

Comments: 10 pages, 4 figures, RevTex4

\\

A single down spin Fermion with an attractive, zero range interaction with a

Fermi sea of up-spin Fermions forms a polaronic quasiparticle. The associated

quasiparticle weight vanishes beyond a critical strength of the attractive

interaction, where a many-body bound state is formed. From a variational

wavefunction in the molecular limit, we determine the critical value for the

polaron to molecule transition. The value agrees well with the diagrammatic

Monte Carlo results of Prokof'ev and Svistunov and is consistent with recent

rf-spectroscopy measurements of the quasiparticle weight by Schirotzek et. al.

In addition, we calculate the contact coefficient of the strongly imbalanced

gas, using the adiabatic theorem of Tan and discuss the implications of the

polaron to molecule transition for the phase diagram of the attractive Fermi

gas at finite imbalance.

\\ ( http://arxiv.org/abs/0908.1343 , 30kb)

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arXiv:0908.0950 (*cross-listing*)

Date: Thu, 6 Aug 2009 20:20:30 GMT (107kb)

Title: Spin response of a normal Fermi liquid with noncentral interactions

Authors: C.J. Pethick, A. Schwenk

Categories: nucl-th astro-ph.HE cond-mat.other

Comments: 9 pages, 2 figures; NORDITA-2009-36

\\

We consider the spin response of a normal Fermi liquid with noncentral

interactions under conditions intermediate between the collisionless and

hydrodynamic regimes. This problem is of importance for calculations of

neutrino properties in dense matter. By expressing the deviation of the

quasiparticle distribution function from equilibrium in terms of eigenfunctions

of the transport equation under the combined influence of collisions and an

external field, we derive a closed expression for the

spin-density--spin-density response function and compare its predictions with

that of a relaxation time approximation. Our results indicate that the

relaxation time approximation is reliable for neutrino properties under

astrophysically relevant conditions.

\\ ( http://arxiv.org/abs/0908.0950 , 107kb)

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arXiv:0908.1483

Date: Tue, 11 Aug 2009 09:09:05 GMT (562kb)

Title: Atom cooling by non-adiabatic expansion

Authors: Xi Chen, J. G. Muga, A. del Campo, A. Ruschhaupt

Categories: quant-ph

Comments: 4 pages, 4 figures

\\

Motivated by the recent discovery that a reflecting wall moving with a

square-root in time trajectory behaves as a universal stopper of classical

particles regardless of their initial velocities, we compare linear in time and

square-root in time expansions of a box to achieve efficient atom cooling. For

the quantum single-atom wavefunctions studied the square-root in time expansion

presents important advantages: asymptotically it leads to zero average energy

whereas any linear in time (constant box-wall velocity) expansion leaves a

non-zero residual energy, except in the limit of an infinitely slow expansion.

For finite final times and box lengths we set a number of bounds and cooling

principles which again confirm the superior performance of the square-root in

time expansion, even more clearly for increasing excitation of the initial

state. Breakdown of adiabaticity is generally fatal for cooling with the linear

expansion but not so with the square-root expansion.

\\ ( http://arxiv.org/abs/0908.1483 , 562kb)

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arXiv:0908.1569

Date: Tue, 11 Aug 2009 20:00:41 GMT (71kb,D)

Title: Probing phase-separation in Bose-Fermi mixtures by the critical

superfluid velocity

Authors: Jacob Linder and Asle Sudb{\o}

Categories: cond-mat.quant-gas

Comments: 7 pages, 5 figures

\\

We investigate the effect exerted by spin-polarized fermions on the

interaction between superfluid bosons for a Bose-Fermi mixture residing on an

optical lattice, with particular emphasis on the possibility of an induced

phase-separation. Using a set of microscopic parameters relevant to a

$^{40}$K-$^{87}$Rb mixture, we show how the phase-separation criterion may be

directly probed by means of the critical superfluid velocity of the bosonic

condensate. We report quantitative results for the magnitude of the superfluid

velocity and its dependence on the trap depth, the boson-fermion interaction,

and the fermionic filling fraction. All of these parameters can be controlled

experimentally in a well-defined manner. We propose an experimental setup for

probing the critical superfluid velocity.

\\ ( http://arxiv.org/abs/0908.1569 , 71kb)

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arXiv:0908.1593

Date: Tue, 11 Aug 2009 22:26:13 GMT (1415kb,D)

Title: Spontaneous Vortex Lattices in Quasi 2D Dipolar Spinor Condensates

Authors: Jian Zhang and Tin-Lun HO

Categories: cond-mat.quant-gas

Comments: 4 pages, 6 figures

\\

Motivated by recent experiments\cite{BA}\cite{BB}, we study quasi 2D

ferromagnetic condensates with various aspect ratios. We find that in zero

magnetic field, dipolar energy generates a local energy minimum with all the

spins lie in the 2D plane forming a row of {\em circular} spin textures with

{\em alternating} orientation, corresponding to a packing of vortices of {\em

identical} vorticity in different spin components. In a large magnetic field,

the system can fall into a long lived dynamical state consisting of an array of

elliptic and hyperbolic Mermin-Ho spin textures, while the true equilibrium is

an uniaxial spin density wave with a single wave-vector along the magnetic

field, and a wavelength similar to the characteristic length of the long lived

vortex array state.

\\ ( http://arxiv.org/abs/0908.1593 , 1415kb)

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arXiv:0908.1634

Date: Wed, 12 Aug 2009 08:34:38 GMT (1783kb,D)

Title: Optimal control of number squeezing in trapped Bose-Einstein condensates

Authors: Julian Grond, Gregory von Winckel, Joerg Schmiedmayer, Ulrich

Hohenester

Categories: cond-mat.other

Comments: 17 pages, 21 figures

\\

We theoretically analyze atom interferometry based on trapped ultracold

atoms, and employ optimal control theory in order to optimize number squeezing

and condensate trapping. In our simulations, we consider a setup where the

confinement potential is transformed from a single to a double well, which

allows to split the condensate. To avoid in the ensuing phase-accumulation

stage of the interferometer dephasing due to the nonlinear atom-atom

interactions, the atom number fluctuations between the two wells should be

sufficiently low. We show that low number fluctuations (high number squeezing)

can be obtained by optimized splitting protocols. Two types of solutions are

found: in the Josephson regime we find an oscillatory tunnel control and a

parametric amplification of number squeezing, while in the Fock regime

squeezing is obtained solely due to the nonlinear coupling, which is

transformed to number squeezing by peaked tunnel pulses. We study splitting and

squeezing within the frameworks of a generic two-mode model, which allows us to

study the basic physical mechanisms, and the multi-configurational time

dependent Hartree for bosons method, which allows for a microscopic modeling of

the splitting dynamics in realistic experiments. Both models give similar

results, thus highlighting the general nature of these two solution schemes. We

finally analyze our results in the context of atom interferometry.

\\ ( http://arxiv.org/abs/0908.1634 , 1783kb)

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arXiv:0908.1794

Date: Wed, 12 Aug 2009 20:17:54 GMT (108kb)

Title: Improving the efficiency of ultracold dipolar molecule formation by

first loading onto an optical lattice

Authors: J. K. Freericks, M. M. Maska, Anzi Hu, Thomas M. Hanna, C. J.

Williams, P. S. Julienne, and R. Lemanski

Categories: cond-mat.quant-gas

Comments: (5 pages, 3 pages, submitted to Phys. Rev. Lett.)

\\

Ultracold ground state dipolar 40K-87Rb molecules have recently been produced

in a loose harmonic trap by employing a magnetic field sweep across a Feshbach

resonance followed by stimulated Raman adiabatic passage [K.-K. Ni et al.,

Science 322, 231 (2008)]. The overall experimental efficiency for molecule

formation was around 20%. We show that the efficiency can be increased to

nearly 100% if one first loads the atomic gases into an optical lattice of the

appropriate depth and tunes the interspecies attraction to have exactly one

atom of each species at an occupied lattice site. Our proposed scheme provides

a large enhancement to the dipolar molecule density even at relatively high

temperatures, and avoids three-body recombination loss by preventing lattice

sites from being triply occupied.

\\ ( http://arxiv.org/abs/0908.1794 , 108kb)

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arXiv:0908.1947

Date: Thu, 13 Aug 2009 18:15:20 GMT (214kb)

Title: Speed of sound in disordered Bose-Einstein condensates

Authors: Christopher Gaul, Nina Renner, Cord Axel Mueller

Categories: cond-mat.quant-gas

Comments: 6 pages

\\

Disorder modifies the sound-wave excitation spectrum of Bose-Einstein

condensates (BEC). We consider the classical hydrodynamic limit, where the

disorder correlation length is much longer than the condensate healing length.

By perturbation theory, we compute the phonon lifetime and correction to the

speed of sound. This correction is found to be negative in all dimensions, with

universal asymptotics for smooth correlations. Considering in detail optical

speckle potentials, we find a quite rich intermediate structure. This has

consequences for the average density of states, particularly in one dimension,

where we find a ``boson dip'' next to a sharp ``boson peak'' as function of

frequency. In one dimension, our prediction is verified in detail by a

numerical integration of the Gross-Pitaevskii equation.

\\ ( http://arxiv.org/abs/0908.1947 , 214kb)

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The replacements:

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arXiv:0902.2979

replaced with revised version Fri, 7 Aug 2009 16:49:35 GMT (38kb)

Title: Caustic formation in expanding condensates of cold atoms

Authors: J. T. Chalker, B. Shapiro

Categories: cond-mat.dis-nn cond-mat.other quant-ph

Comments: 10 pages, 5 figures. Published version

Journal-ref: Phys. Rev. A 80, 013603 (2009)

DOI: 10.1103/PhysRevA.80.013603

\\ ( http://arxiv.org/abs/0902.2979 , 38kb)

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arXiv:0904.2062

replaced with revised version Fri, 7 Aug 2009 07:07:51 GMT (2597kb)

Title: Spatially inhomogeneous phase evolution of a two-component Bose-Einstein

condensate

Authors: R. P. Anderson, C. Ticknor, A. I. Sidorov, B. V. Hall

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

Comments: 8 pages, 7 figures

Journal-ref: Phys. Rev. A 80, 023603 (2009)

DOI: 10.1103/PhysRevA.80.023603

\\ ( http://arxiv.org/abs/0904.2062 , 2597kb)

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arXiv:0907.1866

replaced with revised version Fri, 7 Aug 2009 19:30:41 GMT (284kb,D)

Title: Density profiles and spin oscillations of an interacting three-component

normal Fermi gas

Authors: Theja N. De Silva

Categories: cond-mat.quant-gas

Comments: Total seven pages with six figures. A new section added

\\ ( http://arxiv.org/abs/0907.1866 , 284kb)

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arXiv:0908.0590

replaced with revised version Fri, 7 Aug 2009 05:10:04 GMT (394kb)

Title: Detecting Bose-Einstein condensation of exciton-polaritons via electron

transport

Authors: Yueh-Nan Chen, Neill Lambert, Franco Nori

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

Comments: 5 Pages, 3 Figures

\\ ( http://arxiv.org/abs/0908.0590 , 394kb)

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arXiv:0906.1031

replaced with revised version Fri, 7 Aug 2009 05:01:46 GMT (161kb,D)

Title: Continuous measurement feedback control of a Bose-Einstein condensate

using phase contrast imaging

Authors: S. S. Szigeti, M. R. Hush, A. R. R. Carvalho and J. J. Hope

Categories: quant-ph

Comments: 4 figures, 11 pages

Journal-ref: S. S. Szigeti, M. R. Hush, A. R. R. Carvalho and J. J. Hope, Phys.

Rev. A 80, 013614 (2009)

DOI: 10.1103/PhysRevA.80.013614

\\ ( http://arxiv.org/abs/0906.1031 , 161kb)

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arXiv:0807.3893

replaced with revised version Sun, 9 Aug 2009 18:42:39 GMT (672kb)

Title: Decay of soliton-like perturbations into vortex - anti vortex pairs

Authors: Eniko J. M. Madarassy

Categories: cond-mat.other

Comments: 14 pages, 16 figures. Accepted by the Romanian Journal of Physics

\\ ( http://arxiv.org/abs/0807.3893 , 672kb)

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arXiv:0906.2116

replaced with revised version Mon, 10 Aug 2009 16:13:40 GMT (2289kb)

Title: Multi-band spectroscopy of inhomogeneous Mott-insulator states of

ultracold bosons

Authors: D. Clement, N. Fabbri, L. Fallani, C. Fort and M. Inguscio

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

Comments: 19 pages, 7 figures

\\ ( http://arxiv.org/abs/0906.2116 , 2289kb)

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arXiv:0907.3659

replaced with revised version Fri, 7 Aug 2009 20:32:30 GMT (26kb)

Title: High-momentum tail in the Tonks-Girardeau gas under general confining

potentials

Authors: Gustavo A. Moreno

Categories: cond-mat.quant-gas

Comments: Minor modifications

\\ ( http://arxiv.org/abs/0907.3659 , 26kb)

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arXiv:0908.1073

replaced with revised version Mon, 10 Aug 2009 12:50:12 GMT (42kb)

Title: Universal scaling in a trapped Fermi super-fluid in the BCS-unitarity

crossover

Authors: Sadhan K. Adhikari

Categories: cond-mat.quant-gas

Comments: 4 pages, 4 figures, Contribution to the 18th International Laser

Physics Workshop, Barcelona, Spain, July 13 - 17, 2009

\\ ( http://arxiv.org/abs/0908.1073 , 42kb)

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arXiv:0908.0263

replaced with revised version Sun, 9 Aug 2009 03:55:17 GMT (763kb)

Title: Imaging-based Parametric Resonance in an Optical Dipole Atom Trap

Authors: S. Balik, A.L. Win and M.D. Havey

Categories: quant-ph

Journal-ref: PHYSICAL REVIEW A 80, 023404 (2009)

\\ ( http://arxiv.org/abs/0908.0263 , 763kb)

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arXiv:0905.0257

replaced with revised version Tue, 11 Aug 2009 14:02:01 GMT (672kb)

Title: First and second sound in a strongly interacting Fermi gas

Authors: E. Taylor, H. Hu, X.-J. Liu, L. P. Pitaevskii, A. Griffin, S.

Stringari

Categories: cond-mat.quant-gas

Comments: Updated version. 7 pages, 4 figures

\\ ( http://arxiv.org/abs/0905.0257 , 672kb)

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arXiv:0907.0720

replaced with revised version Tue, 11 Aug 2009 19:33:00 GMT (38kb)

Title: Semiclassical dynamics of atomic Bose-Einstein condensates

Authors: S. Choi and B. Sundaram

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

Comments: 4 figures. Submitted for publication. v2: includes a couple of new

references and some additional sentences

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

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arXiv:0901.3148

replaced with revised version Wed, 12 Aug 2009 20:41:28 GMT (112kb)

Title: Heavy-Light Fermion Mixtures at Unitarity

Authors: Alexandros Gezerlis, S. Gandolfi, K. E. Schmidt, J. Carlson

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

Comments: 4+ pages, 4 figures; 2 references added; v2 corresponds to the

published version

Report-no: LA-UR 09-00434

Journal-ref: Phys. Rev. Lett. 103, 060403 (2009)

DOI: 10.1103/PhysRevLett.103.060403

\\ ( http://arxiv.org/abs/0901.3148 , 112kb)

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arXiv:0902.0107

replaced with revised version Thu, 13 Aug 2009 16:53:55 GMT (394kb)

Title: One-dimensional Anderson localization in certain correlated random

potentials

Authors: Pierre Lugan (LCFIO), Alain Aspect (LCFIO), Laurent Sanchez-Palencia

(LCFIO), Dominique Delande (LKB - Jussieu), Beno\^it Gr\'emaud (LKB -

Jussieu, IPAL, CNRS), Cord A. M\"uller (LKB - Jussieu), Christian Miniatura

(IPAL, CNRS, INLN)

Categories: cond-mat.other

Journal-ref: Physical Review A: Atomic, Molecular and Optical Physics 80 (2009)

023605

DOI: 10.1103/PhysRevA.80.023605

\\ ( http://arxiv.org/abs/0902.0107 , 394kb)

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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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