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

Date: Tue, 20 Mar 2007 17:15:32 +1000 (EST)

Date: Tue, 20 Mar 2007 17:15:32 +1000 (EST)

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

Hello all,

This week there are 23 new abstracts and 9 replacements.

------------------------------------------------------------------------------

\\

Paper: cond-mat/0703237

Date: Fri, 9 Mar 2007 02:34:56 GMT (44kb)

Title: The multi-configurational time-dependent Hartree method for bosons:

Many-body dynamics of bosonic systems

Authors: Ofir E. Alon, Alexej I. Streltsov, and Lorenz S. Cederbaum

Categories: cond-mat.other

Comments: 30 pages, 2 figures

Subj-class: Other

\\

The evolution of Bose-Einstein condensates is amply described by the

time-dependent Gross-Pitaevskii mean-field theory which assumes all bosons to

reside in a single time-dependent one-particle state throughout the propagation

process. In this work, we go beyond mean-field and develop an essentially-exact

many-body theory for the propagation of the time-dependent Schr\"odinger

equation of $N$ interacting identical bosons. In our theory, the time-dependent

many-boson wavefunction is written as a sum of permanents assembled from

orthogonal one-particle functions, or orbitals, where {\it both} the expansion

coefficients {\it and} the permanents (orbitals) themselves are {\it

time-dependent} and fully determined according to a standard time-dependent

variational principle. By employing either the usual Lagrangian formulation or

the Dirac-Frenkel variational principle we arrive at two sets of coupled

equations-of-motion, one for the orbitals and one for the expansion

coefficients. The first set comprises of first-order differential equations in

time and non-linear integro-differential equations in position space, whereas

the second set consists of first-order differential equations with

time-dependent coefficients. We call our theory multi-configurational

time-dependent Hartree for bosons, or MCTDHB($M$), where $M$ specifies the

number of time-dependent orbitals used to construct the permanents. Numerical

implementation of the theory is reported and illustrative numerical examples of

many-body dynamics of trapped Bose-Einstein condensates are provided and

discussed.

\\ ( http://arXiv.org/abs/cond-mat/0703237 , 44kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0703248

Date: Fri, 9 Mar 2007 16:29:31 GMT (584kb)

Title: Condensate depletion in two-species Bose gases: A variational Quantum

Monte Carlo study

Authors: A. R. Sakhel, J. L. DuBois, and H. R. Glyde

Categories: cond-mat.other

Comments: 19 pages, 17 figures

Subj-class: Other

\\

We investigate two-species Bose gases in traps with various interactions

using variational Quantum Monte Carlo (VMC) techniques at zero temperature. The

bosons are represented by hard spheres (HS) whose diameter is equivalent to the

s-wave scattering length in the low-energy and long-wavelength approximation.

We explore the role of repulsive and attractive inter- or intraspecies

interactions on the condensate properties of the mixtures, particularly the

condensate fraction of each species as compared to the case when each species

is in a separate trap of its own. We model the repulsive interactions by a hard

core (HC) potential and the attractive interactions by a shallow model

potential. The VMC density profiles and energies are evaluated at various

interactions and two mass ratios of the species.

\\ ( http://arXiv.org/abs/cond-mat/0703248 , 584kb)

------------------------------------------------------------------------------

\\

Paper: physics/0703105

Date: Thu, 8 Mar 2007 23:10:08 GMT (266kb)

Title: Classical and quantum anomalous diffusion in a system of

2$\delta$-kicked Quantum Rotors

Authors: Jiao Wang and Antonio M. Garcia-Garcia

Categories: physics.atom-ph

Comments: 9 pages, 3 figures

Subj-class: Atomic Physics

\\

We study the dynamics of cold atoms subjected to {\em pairs} of closely

time-spaced $\delta$-kicks from standing waves of light. The classical phase

space of this system is partitioned into momentum cells separated by trapping

regions. In a certain range of parameters it is shown that the classical motion

is well described by a process of anomalous diffusion. We investigate in detail

the impact of the underlying classical anomalous diffusion on the quantum

dynamics with special emphasis on the phenomenon of dynamical localization.

Based on the study of the quantum density of probability, its second moment and

the return probability we identify a region of weak dynamical localization

where the quantum diffusion is still anomalous but the diffusion rate is slower

than in the classical case. Moreover we examine how other relevant time scales

such as the quantum-classical breaking time or the one related to the beginning

of full dynamical localization are modified by the classical anomalous

diffusion. Finally we discuss the relevance of our results for the

understanding of the role of classical cantori in quantum mechanics.

\\ ( http://arXiv.org/abs/physics/0703105 , 266kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0703258

Date: Mon, 12 Mar 2007 01:13:51 GMT (73kb)

Title: Mixtures of ultracold fermions with unequal masses

Authors: M. Iskin and C. A. R. Sa de Melo

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

Comments: 14 pages, 9 figures. Extended version of cond-mat/0606624

Subj-class: Superconductivity; Other

\\

We analyze the phase diagram of superfluidity for two-species fermion

mixtures from the Bardeen-Cooper-Schrieffer (BCS) to Bose-Einstein condensation

(BEC) limit as a function of scattering parameter, population imbalance and

mass anisotropy. We identify regions corresponding to normal, or

uniform/non-uniform superfluid phases, and discuss topological quantum phase

transitions in the BCS, unitarity and BEC limits. We derive the Ginzburg-Landau

equation near the critical temperature, and show that it describes a dilute

mixture of paired and unpaired fermions in the BEC limit. We also obtain the

zero temperature low frequency and long wavelength collective excitation

spectrum, and recover the Bogoliubov relation for weakly interacting dilute

bosons in the BEC limit. Lastly, we discuss the effects of harmonic traps and

the resulting density profiles in the BEC regime.

\\ ( http://arXiv.org/abs/cond-mat/0703258 , 73kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0703261

Date: Mon, 12 Mar 2007 17:10:20 GMT (225kb)

Title: D-wave correlated Critical Bose Liquids in two dimensions

Authors: O. I. Motrunich and M. P. A. Fisher

Categories: cond-mat.str-el

Comments: 33 pages, 17 figures

Subj-class: Strongly Correlated Electrons

\\

We develop a description of a new quantum liquid phase of interacting bosons

in 2d which possesses relative D-wave two-body correlations and which we call a

D-wave Bose Liquid (DBL). The DBL has no broken symmetries, supports gapless

boson excitations residing on "Bose surfaces" in momentum space, and exhibits

power law correlations with continuously variable exponents. While the DBL can

be constructed for bosons in the 2d continuum, the state only respects the

point group symmetries of the square lattice. On the lattice the DBL respects

all symmetries and does not require a particular filling. But lattice effects

allow a second distinct phase, a quasi-local variant which we call a D-wave

Local Bose Liquid (DLBL). Remarkably, the DLBL has short-range boson

correlations and hence no Bose surfaces, despite sharing gapless excitations

and other critical signatures with the DBL. Moreover, both phases are metals

with a resistance that vanishes as a power of the temperature. We establish

these results by constructing a class of many-particle wavefunctions for the

DBL, which are time reversal invariant analogs of Laughlin's quantum Hall

wavefunction for bosons at $\nu=1/2$. A gauge theory formulation leads to a

simple mean field theory, and an N-flavor generalization enables incorporation

of gauge field fluctuations to deduce the properties of the DBL/DLBL; various

equal time correlation functions are in qualitative accord with the properties

inferred from the wavefunctions. We also identify a promising Hamiltonian which

might manifest the DBL or DLBL, and perform a variational study comparing to

other competing phases. We suggest how the DBL wavefunction can be generalized

to describe an itinerant non-Fermi liquid phase of electrons on the square

lattice with a no double occupancy constraint, a D-wave metal phase.

\\ ( http://arXiv.org/abs/cond-mat/0703261 , 225kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0703262

Date: Sat, 10 Mar 2007 09:33:40 GMT (482kb)

Title: Thinning of superfluid films below the critical point

Authors: Roya Zandi, Aviva Shackell, Joseph Rudnick, Mehran Kardar, Lincoln

Chayes

Categories: cond-mat.stat-mech

Comments: 4 pages

Subj-class: Statistical Mechanics

\\

Experiments on $^4$He films reveal an attractive Casimir-like force at the

bulk $\lambda$-point, and in the superfluid regime. Previous work has explained

the magnitude of this force at the $\lambda$ transition and deep in the

superfluid region but not the substantial attractive force immediately below

the $\lambda$-point. Utilizing a simple mean-field calculation renormalized by

critical fluctuations we obtain an effective Casimir force that is

qualitatively consistent with the scaling function $\vartheta$ obtained by

collapse of experimental data. Notably, we find that the minimum of the scaling

function lies at at $x=tL^{1/\nu}=-\pi^2$ in excellent agreement with the

experimental finding of $x=tL^{1/\nu}=-9.7 \pm 0.8 $.

\\ ( http://arXiv.org/abs/cond-mat/0703262 , 482kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0703269

Date: Sun, 11 Mar 2007 01:25:25 GMT (187kb)

Title: Issues impacting the observation of Efimov physics in ultracold quantum

gases

Authors: J. P. D'Incao, B. D. Esry

Categories: cond-mat.other

Subj-class: Other

\\

We discuss several issues important for experimentally observing Efimov

physics in ultracold quantum gases. Using numerical solutions of the

three-boson Schrodinger equation over a broad range of scattering lengths and

energies, including model potentials with multiple bound states, we address the

complications of relating experimental observations to available analytic

expressions. These more realistic potentials introduce features that can mask

the predicted Efimov physics at small scattering lengths. They also allow us to

show that positive and negative scattering lengths are universally connected

only across a pole, not across a zero. Additionally, we show that the spacing

between Efimov features for the relatively small scattering lengths

experimentally accessible do not precisely follow the geometric progression

expected for Efimov physics.

\\ ( http://arXiv.org/abs/cond-mat/0703269 , 187kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0703282

Date: Mon, 12 Mar 2007 01:52:29 GMT (15kb)

Title: Temperature and scattering length dependent condensate fraction of

trapped Bose atoms

Authors: Sang-Hoon Kim

Categories: cond-mat.stat-mech

Comments: 3 pages, 3 figures

Subj-class: Statistical Mechanics

\\

A method to estimate the temperature and scattering length dependent

condensate fraction of interacting Bose atoms confined by an external harmonic

potential is suggested. Starting from the statistical distribution of

non-interacting bosons in a harmonic trap, it is extended to include the

interaction between atoms. The increasing of the interaction produces an

exponential decreasing to the non-interacting model.

\\ ( http://arXiv.org/abs/cond-mat/0703282 , 15kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0703284

Date: Mon, 12 Mar 2007 06:29:59 GMT (117kb)

Title: Mott insulating phases and quantum phase transitions of interacting

spin-3/2 fermionic cold atoms in optical lattices at half filling

Authors: Hong-Hao Tu, Guang-Ming Zhang, Lu Yu

Categories: cond-mat.str-el

Comments: 11 pages, 4 figures

Subj-class: Strongly Correlated Electrons

\\

We study various Mott insulating phases of interacting spin-3/2 fermionic

ultracold atoms in two-dimensional square optical lattices at half filling.

Using a generalized one-band Hubbard model with hidden SO(5) symmetry, we

identify two distinct symmetry breaking phases: the degenerate

antiferromagnetic spin-dipole/spin-octupole ordering and spin-quadrupole

ordering, depending on the sign of the spin-dependent interaction. These two

competing orders exhibit very different symmetry properties, low energy

excitations and topological characterizations. Near the SU(4) symmetric point,

a quantum critical state with a $\pi $-flux phase may emerge due to strong

quantum fluctuations, leading to spin algebraic correlations and gapless

excitations.

\\ ( http://arXiv.org/abs/cond-mat/0703284 , 117kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0703292

Date: Mon, 12 Mar 2007 11:24:23 GMT (974kb,D)

Title: Metal clusters, quantum dots and trapped atoms -- from single-particle

models to correlatio

Authors: M. Manninen and S.M. Reimann

Categories: cond-mat.mes-hall cond-mat.mtrl-sci

Comments: 51 pages 29 figures

Subj-class: Mesoscopic Systems and Quantum Hall Effect; Materials Science

\\

In this review, we discuss the electronic structure of finite quantal systems

on the nanoscale. After a few general remarks on the many-particle physics of

the harmonic oscillator -- likely being the most studied example for the

many-body systems of finite quantal systems, we discuss properties of metal

clusters, quantum dots and cold atoms in traps. We address magic numbers, shape

deformation, magnetism, particle localization, and vortex formation in rotating

systems.

\\ ( http://arXiv.org/abs/cond-mat/0703292 , 974kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0703308

Date: Mon, 12 Mar 2007 19:34:39 GMT (115kb)

Title: Condensates of Strongly-interacting Atoms and Dynamically Generated

Dimers

Authors: Eric Braaten, Dongqing Zhang

Categories: cond-mat.soft

Comments: 10 figures

Subj-class: Soft Condensed Matter

\\

In a system of atoms with large positive scattering length, weakly-bound

diatomic molecules (dimers) are generated dynamically by the strong

interactions between the atoms. If the atoms are modeled by a quantum field

theory with an atom field only, condensates of dimers cannot be described by

the mean-field approximation because there is no field associated with the

dimers. We develop a method for describing dimer condensates in such a model

based on the one-particle-irreducible (1PI) effective action. We construct an

equivalent 1PI effective action that depends not only on the classical atom

field but also on a classical dimer field. The method is illustrated by

applying it to the many-body behavior of bosonic atoms with large scattering

length at zero temperature using an approximation in which the 2-atom amplitude

is treated exactly but irreducible $N$-atom amplitudes for $N \ge 3$ are

neglected. The two 1PI effective actions give identical results for the atom

superfluid phase, but the one with a classical dimer field is much more

convenient for describing the dimer superfluid phase. The results are also

compared with previous work on the Bose gas near a Feshbach resonance.

\\ ( http://arXiv.org/abs/cond-mat/0703308 , 115kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0703314

Date: Mon, 12 Mar 2007 21:04:34 GMT (539kb)

Title: Quenching, relaxation, and a central limit theorem for quantum lattice

systems

Authors: M. Cramer, C.M. Dawson, J. Eisert, T.J. Osborne

Categories: cond-mat.stat-mech

Comments: 8 pages, 3 figures

Subj-class: Statistical Mechanics

\\

A reasonable physical intuition in the study of interacting quantum systems

says that, independent of the initial state, the system will tend to

equilibrate. In this work we study a setting where relaxation to a steady state

is exact, namely for the Bose-Hubbard model where the system is quenched from a

Mott quantum phase to the strong superfluid regime. We find that the evolving

state locally relaxes to a steady state with maximum entropy constrained by

second moments, maximizing the entanglement, to a state which is different from

the thermal state of the new Hamiltonian. Remarkably, in the infinite system

limit this relaxation is true for all large times, and no time average is

necessary. For large but finite system size we give a time interval for which

the system locally "looks relaxed" up to a prescribed error. Our argument

includes a central limit theorem for harmonic systems and exploits the finite

speed of sound. Additionally, we show that for all periodic initial

configurations, reminiscent of charge density waves, the system relaxes

locally. We sketch experimentally accessible signatures in optical lattices as

well as implications for the foundations of quantum statistical mechanics.

\\ ( http://arXiv.org/abs/cond-mat/0703314 , 539kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0703322

Date: Tue, 13 Mar 2007 03:39:46 GMT (353kb)

Title: Heteronuclear molecules in an optical lattice: Theory and experiment

Authors: Frank Deuretzbacher, Kim Plassmeier, Daniela Pfannkuche, F\'elix

Werner, Christian Ospelkaus, Silke Ospelkaus, Klaus Sengstock, Kai Bongs

Categories: cond-mat.other

Comments: 9 pages, 7 figures

Subj-class: Other

\\

We study properties of two different atoms at a single optical lattice site

at a heteronuclear atomic Feshbach resonance. We calculate the energy spectrum,

the efficiency of rf-association and the lifetime as a function of magnetic

field and compare the results with the experimental data obtained for K-40 and

Rb-87 [C. Ospelkaus et al., Phys. Rev. Lett. 97, 120402 (2006)]. We treat the

interaction in terms of a regularized delta function pseudopotential and

consider the general case of particles with different trap frequencies, where

the usual approach of separating center of mass and relative motion fails. We

develop an exact diagonalization approach to the coupling between center of

mass and relative motion and numerically determine the spectrum of the system.

At the same time, our approach allows us to treat the anharmonicity of the

lattice potential exactly. Within the pseudopotential model, the center of the

Feshbach resonance can be precisely determined from the experimental data.

\\ ( http://arXiv.org/abs/cond-mat/0703322 , 353kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0703327

Date: Tue, 13 Mar 2007 06:40:40 GMT (793kb)

Title: Internal Josephson-Like Tunneling in Two-Component Bose-Einstein

Condensates Affected by Sign of the Atomic Interaction and External Trapping

Potential

Authors: Bo Xiong, X. X. Liu

Categories: cond-mat.other

Comments: 4 pages, 5 figures

Subj-class: Other

\\

We study the Josephson-like tunneling in two-component Bose-Einstein

condensates coupled with microwave field in respond to various attractive and

repulsive atomic interaction under the various aspect ratio of trapping

potential and the gravitational field. It is very interesting to find that the

dynamic of Josephson-like tunneling can be controlled from fast damped

oscillations and asymmetric occupation to nondamped oscillation and symmetric

occupation.

\\ ( http://arXiv.org/abs/cond-mat/0703327 , 793kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0703346

Date: Tue, 13 Mar 2007 16:09:57 GMT (439kb)

Title: Noise correlations in a chain of ultracold fermions - A numerical study

Authors: Andreas Luscher, Andreas Laeuchli, Reinhard M. Noack

Categories: cond-mat.str-el

Comments: 12 pages, 7 figures

Subj-class: Strongly Correlated Electrons

\\

We present a numerical study of noise correlations, i.e., density-density

correlations in momentum space, in the extended fermionic Hubbard model in one

dimension. In experiments with ultracold atoms, these noise correlations can be

extracted from time-of-flight images of the expanding cloud. Using the

density-matrix renormalization group method to investigate the Hubbard model at

various fillings and interactions, we confirm that the shot noise contains full

information on the correlations present in the system. We point out the

importance of the sum rules fulfilled by the noise correlations and show that

they yield nonsingular structures beyond the predictions of bosonization

approaches. Noise correlations can thus serve as a universal probe of order and

can be used to characterize the many-body states of cold atoms in optical

lattices.

\\ ( http://arXiv.org/abs/cond-mat/0703346 , 439kb)

------------------------------------------------------------------------------

\\

Paper: quant-ph/0703111

Date: Tue, 13 Mar 2007 18:56:13 GMT (150kb)

Title: Relative-intensity squeezing at audio frequencies using four-wave mixing

in an atomic vapor

Authors: C. F. McCormick, A. M. Marino, V. Boyer, P. D. Lett (NIST)

Categories: quant-ph

Comments: 5 pages, 6 figures

\\

We demonstrate the use of four-wave mixing in hot atomic vapor to generate up

to -7.1 dB of measured relative-intensity squeezing. Due to its intrinsic

simplicity, our system is strongly decoupled from environmental noise, and we

observe more than -4 dB of squeezing down to frequencies as low as 5 kHz. This

robust source of narrowband squeezed light may be useful for a variety of

applications, such as coupling to atomic ensembles and enhancing the

sensitivity of photothermal spectroscopy.

\\ ( http://arXiv.org/abs/quant-ph/0703111 , 150kb)

------------------------------------------------------------------------------

\\

Paper: physics/0703136

Date: Tue, 13 Mar 2007 15:26:29 GMT (254kb)

Title: Interactions and dynamics in Li + Li_2 ultracold collisions

Authors: Marko T. Cvitas, Pavel Soldan, Jeremy M. Hutson, Pascal Honvault and

Jean-Michel Launay

Categories: physics.chem-ph physics.atom-ph

Comments: 21 pages, 26 figures

Subj-class: Chemical Physics; Atomic Physics

\\

A potential energy surface for the lowest quartet electronic state of lithium

trimer is developed and used to study spin-polarized Li + Li_2 collisions at

ultralow kinetic energies. The potential energy surface allows barrierless atom

exchange reactions. Elastic and inelastic cross sections are calculated for

collisions involving a variety of rovibrational states of Li_2. Inelastic

collisions are responsible for trap loss in molecule production experiments.

Isotope effects and the sensitivity of the results to details of the potential

energy surface are investigated. It is found that for vibrationally excited

states the cross sections are only quite weakly dependent on details of the

potential energy surface.

\\ ( http://arXiv.org/abs/physics/0703136 , 254kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0703352

Date: Tue, 13 Mar 2007 20:04:23 GMT (96kb)

Title: Interaction-Induced Adiabatic Cooling for Antiferromagnetism in Optical

Lattices

Authors: A.-M. Dar\'{e}, L. Raymond, G. Albinet, A.-M.S. Tremblay

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

Comments: 10 pages, 7 figures

Subj-class: Strongly Correlated Electrons; Other

\\

In the experimental context of cold-fermion optical lattices, we discuss the

possibilities to approach the pseudogap or ordered phases by manipulating the

scattering length or the strength of the laser-induced lattice potential. Using

the Two-Particle Self-Consistent Approach as well as Quantum Monte Carlo

simulations, we provide isentropic curves for the two- and three-dimensional

Hubbard models at half-filling. These quantitative results are important for

practical attempts to reach the ordered antiferromagnetic phase in experiments

on optical lattices of two-component fermions. We find that adiabatically

turning on the interaction in two dimensions to cool the system is not very

effective. In three dimensions, adiabatic cooling to the antiferromagnetic

phase can be achieved in such a manner although the cooling efficiency is not

as high as initially suggested by Dynamical Mean-Field Theory. Adiabatic

cooling by turning off the repulsion beginning at strong coupling is possible

in certain cases.

\\ ( http://arXiv.org/abs/cond-mat/0703352 , 96kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0703366

Date: Wed, 14 Mar 2007 17:08:49 GMT (72kb)

Title: Renormalisation Flow and Universality for Ultracold Fermionic Atoms

Authors: S. Diehl, H. Gies, J. M. Pawlowski, C. Wetterich

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

Comments: 18 pages, 3 figures

Subj-class: Superconductivity; Statistical Mechanics

\\

A functional renormalisation group study for the BEC-BCS crossover for

ultracold gases of fermionic atoms is presented. We discuss the fixed point

which is at the origin of universality for broad Feshbach resonances. All

macroscopic quantities depend only on one relevant parameter, the concentration

a k_F, besides their dependence on the temperature in units of the Fermi

energy. In particular, we compute the universal ratio between molecular and

atomic scattering length in vacuum. We also present an estimate to which level

of accuracy universality holds for gases of Li and K atoms.

\\ ( http://arXiv.org/abs/cond-mat/0703366 , 72kb)

------------------------------------------------------------------------------

\\

Paper: quant-ph/0703123

Date: Wed, 14 Mar 2007 19:27:18 GMT (97kb)

Title: The effect of self-affine fractal roughness of wires on atom chips

Authors: Z. Moktadir, B. Darqui\'{e}, M. Kraft and E. A. Hinds

Categories: quant-ph

Comments: 7 pages, 7 figures

\\

Atom chips use current flowing in lithographically patterned wires to produce

microscopic magnetic traps for atoms. The density distribution of a trapped

cold atom cloud reveals disorder in the trapping potential, which results from

meandering current flow in the wire. Roughness in the edges of the wire is

usually the main cause of this behaviour. Here, we point out that the edges of

microfabricated wires normally exhibit self-affine roughness. We investigate

the consequences of this for disorder in atom traps. In particular, we consider

how closely the trap can approach the wire when there is a maximum allowable

strength of the disorder. We comment on the role of roughness in future

atom--surface interaction experiments.

\\ ( http://arXiv.org/abs/quant-ph/0703123 , 97kb)

------------------------------------------------------------------------------

\\

Paper (*cross-listing*): hep-ph/0703141

Date: Tue, 13 Mar 2007 17:02:03 GMT (40kb)

Title: What atomic liquids can teach us about quark liquids

Authors: Thomas Schaefer

Categories: hep-ph cond-mat.supr-con

Comments: 8 pages, to appear in the proceedings of the Yukawa International

Seminar (YKIS) 2006 "New frontiers in QCD", Kyoto, Japan; submitted to

Progress of Theoretical Physics

Subj-class: High Energy Physics - Phenomenology; Superconductivity

\\

We discuss some aspects of cold atomic Fermi gases in the unitarity limit

that are of interest in connection with the physics of quark matter and the

quark gluon plasma. We consider, in particular, the equation of state,

transport properties, the critical temperature for pair condensation, and the

response to a pair breaking stress.

\\ ( http://arXiv.org/abs/hep-ph/0703141 , 40kb)

------------------------------------------------------------------------------

\\

Paper: quant-ph/0703127

Date: Thu, 15 Mar 2007 01:53:59 GMT (137kb)

Title: Three-Body Recombination in One Dimension

Authors: N. P. Mehta, B. D. Esry, C. H. Greene

Categories: quant-ph

Comments: 15 pages 7 figures Submitted to Physical Review A

Report-no: quant-ph/0703127

\\

We study the three-body problem in one dimension for both zero and finite

range interactions using the adiabatic hyperspherical approach. Particular

emphasis is placed on the threshold laws for recombination, which are derived

for all combinations of the parity and exchange symmetries. For bosons, we

provide a numerical demonstration of several universal features that appear in

the three-body system, and discuss how certain universal features in three

dimensions are different in one dimension. We show that the probability for

inelastic processes vanishes as the range of the pair-wise interaction is taken

to zero and demonstrate numerically that the recombination threshold law

manifests itself for large scattering length.

\\ ( http://arXiv.org/abs/quant-ph/0703127 , 137kb)

------------------------------------------------------------------------------

\\

Paper: quant-ph/0703129

Date: Thu, 15 Mar 2007 05:08:30 GMT (12kb)

Title: When Do Superfluidity and Long Range Order Imply Entanglement?

Authors: Vlatko Vedral

Categories: quant-ph

Comments: 7 pages, no figures

\\

We investigate tacitly assumed relationships between the concepts of

super-fluidity (-conductivity), long range order and entanglement. We prove

that the three are by no means equivalent, but that notwithstanding, some

rigorous implication can be established between them. This leads to three

different, albeit frequently related, notions of "criticality", all of which

are exemplified within the Hubbard model in the low density regime. We use

Peierls' method of twisted Hamiltonians to link the existence of entanglement

to superfluidity and (quasi)-long range order. As an application of our

formalism, we show that recent experiments with cold atoms already prove the

existence of the field theoretic, spatial entanglement in two dimensions. More

interestingly, the appearance of entanglement in these experiments seems to be

intimately related to the phase transition of the Kosterlitz Thouless type.

\\ ( http://arXiv.org/abs/quant-ph/0703129 , 12kb)

------------------------------------------------------------------------------

\\

Paper: physics/0703148

Date: Wed, 14 Mar 2007 20:06:27 GMT (60kb)

Title: Accuracy Evaluation of an Optical Lattice Clock with Bosonic Atoms

Authors: Xavier Baillard (SYRTE), Mathilde Fouch\'{e} (SYRTE), Rodolphe Le

Targat (SYRTE), Philip G. Westergaard (SYRTE), Arnaud Lecallier (SYRTE), Yann

Le Coq (SYRTE), Giovanni D. Rovera (SYRTE), Sebastien Bize (SYRTE), Pierre

Lemonde (SYRTE)

Categories: physics.atom-ph

Comments: 3 pages, 4 figures, uses ol.sty file

Proxy: ccsd hal-00136647

Subj-class: Atomic Physics

\\

We report the first accuracy evaluation of an optical lattice clock based on

the 1S0 - 3P0 transition of an alkaline earth boson, namely 88Sr atoms. This

transition has been enabled using a static coupling magnetic field. The clock

frequency is determined to be 429 228 066 418 009(32) Hz. The isotopic shift

between 87Sr and 88Sr is 62 188 135 Hz with fractional uncertainty 5.10^{-7}.

We discuss the conditions necessary to reach a clock accuracy of 10^{-17} or

less using this scheme.

\\ ( http://arXiv.org/abs/physics/0703148 , 60kb)

------------------------------------------------------------------------------

The replacements:

------------------------------------------------------------------------------

\\

Paper: quant-ph/0602052

replaced with revised version Fri, 9 Mar 2007 09:18:39 GMT (16kb)

Title: Decoherence and Matter Wave Interferometry

Authors: Tabish Qureshi (Jamia Millia Islamia, New Delhi), Anu Venugopalan

(G.G.S. Indraprastha University, Delhi)

Categories: quant-ph

Comments: Sufficiently revised version, to appear in Int. J. Mod. Phys. B

\\ ( http://arXiv.org/abs/quant-ph/0602052 , 16kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0608306

replaced with revised version Sun, 11 Mar 2007 19:20:42 GMT (91kb)

Title: Quantum polarization spectroscopy of ultracold spinor gases

Authors: K. Eckert, L. Zawitkowski, A. Sanpera, M. Lewenstein, E.S. Polzik

Categories: cond-mat.other quant-ph

Comments: 5 pages, 1 figure; v2: minor changes

Subj-class: Other

Journal-ref: Phys. Rev. Lett. 98, 100404 (2007)

DOI: 10.1103/PhysRevLett.98.100404

\\ ( http://arXiv.org/abs/cond-mat/0608306 , 91kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0609212

replaced with revised version Mon, 12 Mar 2007 08:17:35 GMT (229kb)

Title: Exotic Superconducting Phases of Ultracold Atom Mixtures on Triangular

Lattices

Authors: L. Mathey, S.-W. Tsai, A.H. Castro Neto

Categories: cond-mat.supr-con

Comments: 6 pages, 4 figures, extended version, slight modifications

Subj-class: Superconductivity

\\ ( http://arXiv.org/abs/cond-mat/0609212 , 229kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0512134

replaced with revised version Mon, 12 Mar 2007 22:31:40 GMT (84kb)

Title: Acoustic attenuation probe for fermion superfluidity in ultracold atom

gases

Authors: Sergio Gaudio (1)(2), B. Mihaila (2), K. B. Blagoev (2), K. S. Bedell

(1), Eddy Timmermans (2) (1) (Department of Physics, Boston College) (2)

(Theoretical Division, Los Alamos Natl Labs)

Categories: cond-mat.other

Comments: 4 pages, 2 figures. Revised version

Report-no: LAUR-05-3432

Subj-class: Other

\\ ( http://arXiv.org/abs/cond-mat/0512134 , 84kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0609061

replaced with revised version Tue, 13 Mar 2007 16:02:04 GMT (924kb)

Title: Resonant Einstein-de Haas effect in a rubidium condensate

Authors: Krzysztof Gawryluk, Miros{\l}aw Brewczyk, Kai Bongs, and Mariusz Gajda

Categories: cond-mat.other

Comments: 4 pages, 5 figures

Subj-class: Other

\\ ( http://arXiv.org/abs/cond-mat/0609061 , 924kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0702191

replaced with revised version Tue, 13 Mar 2007 03:36:11 GMT (50kb)

Title: Phase Transitions and Pairing Signature in Strongly Attractive Fermi

Atomic Gases

Authors: X W Guan, M T Batchelor, C Lee and M Bortz

Categories: cond-mat.str-el cond-mat.stat-mech

Comments: 4 pages, 3 figures, improvements to text and references updated

Subj-class: Strongly Correlated Electrons; Statistical Mechanics

\\ ( http://arXiv.org/abs/cond-mat/0702191 , 50kb)

------------------------------------------------------------------------------

\\

Paper (*cross-listing*): nucl-th/0701006

replaced with revised version Mon, 12 Mar 2007 20:29:05 GMT (0kb,I)

Title: Spin 1/2 Fermions in the Unitary Limit

Authors: H.S. Kohler

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

Comments: 11 pages and 4 figures; This paper will be revised due to a error in

computer-program

Subj-class: Nuclear Theory; Other

\\ ( http://arXiv.org/abs/nucl-th/0701006 , 0kb)

-----------------------------------------------------------------------------

\\

Paper: quant-ph/0610114

replaced with revised version Tue, 13 Mar 2007 19:44:03 GMT (139kb)

Title: Rotation of atoms in a two dimensional lattice with a harmonic trap

Authors: T. Wang, S. Yelin

Categories: quant-ph

Comments: 4 pages, some paragraphs were refrased, typos corrected. beta is

corrected

\\ ( http://arXiv.org/abs/quant-ph/0610114 , 139kb)

------------------------------------------------------------------------------

\\

Paper: quant-ph/0702254

replaced with revised version Tue, 13 Mar 2007 14:27:56 GMT (836kb)

Title: Measurement of Dicke Narrowing in Electromagnetically Induced

Transparency

Authors: M. Shuker, O. Firstenberg, R. Pugatch, A. Ben-Kish, A. Ron, N.

Davidson

Categories: quant-ph

Comments: Introduction revised

\\ ( http://arXiv.org/abs/quant-ph/0702254 , 836kb)

------------------------------------------------------------------------------

\\

Paper: cond-mat/0703205

replaced with revised version Wed, 14 Mar 2007 09:19:56 GMT (232kb)

Title: Larkin-Ovchinnikov state in resonant Fermi gas

Authors: Nobukatsu Yoshida and S.-K. Yip

Categories: cond-mat.other

Comments: Typos corrected

Subj-class: Other

\\ ( http://arXiv.org/abs/cond-mat/0703205 , 232kb)

------------------------------------------------------------------------------

-- ========================================================================= 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 Tue Mar 20 2007 - 17:15:32 EST

*
This archive was generated by hypermail 2.2.0
: Thu May 08 2008 - 11:51:41 EST
*