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

Date: Wed, 6 Jun 2007 02:59:48 +1000 (EST)

Date: Wed, 6 Jun 2007 02:59:48 +1000 (EST)

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

Last week there were 23 new abstracts and 12 replacements.

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arXiv:0705.3680

Date: Fri, 25 May 2007 00:05:29 GMT (32kb)

Title: Method for quantitative determination of the Hubbard model phase diagram

from optical lattice experiments by two-parameter scaling

Authors: Vivaldo L. Campo Jr., Klaus Capelle, Jorge Quintanilla and Chris

Hooley

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

Comments: 4+ pages, 3 figures, revtex4

\\

We propose an experimental scheme to obtain the phase diagram of the Hubbard

model using cold atoms in optical lattices. The scheme is based on measuring

the total energy for a sequence of trapping potentials with different profiles

and is independent of dimensionality. Its essential ingredient is a

two-parameter scaling procedure that combines a variant of the familiar

finite-size scaling with a nontrivial additional `finite-curvature scaling'

necessary to reach the homogeneous limit. We illustrate the viability of the

scheme in the one-dimensional case, using simulations based on the Bethe Ansatz

local-density approximation as a substitute for experimental data, and show

that the filling corresponding to the Mott transition can be determined with

better than 3% accuracy.

\\ ( http://arxiv.org/abs/0705.3680 , 32kb)

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arXiv:0705.3746

Date: Fri, 25 May 2007 11:09:17 GMT (180kb)

Title: Ramsey interferometry with a two-level Tonks-Girardeau gas

Authors: S. V. Mousavi, A. del Campo, I. Lizuain, J. G. Muga

Categories: cond-mat.other

Comments: 8 pages, 5 figures

\\

We propose a generalization of the Tonks-Girardeau model that describes a

coherent gas of cold two-level Bosons which interact with two external fields

in a Ramsey interferometer. They also interact among themselves by contact

collisions with interchange of momentum and internal state. We study the

corresponding Ramsey fringes and the quantum projection noise which,

essentially unaffected by the interactions, remains that for ideal Bosons. The

dual system of this gas, an ideal gas of two-level Fermions coupled by the

interaction with the separated fields, produces the same fringes and noise

fluctuations. The cases of time-separated and spatially-separated fields are

studied. For spatially separated fields the fringes may be broadened slightly

by increasing the number of particles, but only for large particle numbers far

from present experiments with Tonks-Girardeau gases. The uncertainty in the

determination of the atomic transition frequency diminishes, essentially with

the inverse root of the particle number.

\\ ( http://arxiv.org/abs/0705.3746 , 180kb)

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arXiv:0705.3768

Date: Fri, 25 May 2007 13:30:25 GMT (112kb)

Title: Bose-Einstein-condensed gases in arbitrarily strong random potentials

Authors: V.I.Yukalov, E.P.Yukalova, K.V.Krutitsky, R.Graham

Categories: cond-mat.dis-nn

\\

Bose-Einstein-condensed gases in external spatially random potentials are

considered in the frame of a stochastic self-consistent mean-field approach.

This method permits the treatment of the system properties for the whole range

of the interaction strength, from zero to infinity, as well as for arbitrarily

strong disorder. Besides a condensate and superfluid density, a glassy number

density due to a spatially inhomogeneous component of the condensate occurs.

For very weak interactions and sufficiently strong disorder, the superfluid

fraction can become smaller than the condensate fraction, while at relatively

strong interactions, the superfluid fraction is larger than the condensate

fraction for any strength of disorder. The condensate and superfluid fractions,

and the glassy fraction always coexist, being together either nonzero or zero.

In the presence of disorder, the condensate fraction becomes a nonmonotonic

function of the interaction strength, displaying an antidepletion effect caused

by the competition between the stabilizing role of the atomic interaction and

the destabilizing role of the disorder. With increasing disorder, the

condensate and superfluid fractions jump to zero at a critical value of the

disorder parameter by a first-order phase transition.

\\ ( http://arxiv.org/abs/0705.3768 , 112kb)

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arXiv:0705.3754

Date: Fri, 25 May 2007 16:43:59 GMT (267kb)

Title: Resonant Feshbach scattering of fermions in one-dimensional optical

lattices

Authors: M. Grupp, R. Walser, W.P. Schleich, A. Muramatsu, M. Weitz

Categories: physics.atm-clus physics.atom-ph

\\

We consider Feshbach scattering of fermions in a one-dimensional optical

lattice. By formulating the scattering theory in the crystal momentum basis,

one can exploit the lattice symmetry and factorize the scattering problem in

terms of center-of-mass and relative momentum in the reduced Brillouin zone

scheme. Within a single band approximation, we can tune the position of a

Feshbach resonance with the center-of-mass momentum due to the non-parabolic

form of the energy band.

\\ ( http://arxiv.org/abs/0705.3754 , 267kb)

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arXiv:0705.3858

Date: Fri, 25 May 2007 21:51:30 GMT (606kb)

Title: Tomographic RF Spectroscopy of a Trapped Fermi Gas at Unitarity

Authors: Y. Shin, C. H. Schunck, A. Schirotzek, W. Ketterle

Categories: cond-mat.other cond-mat.soft

\\

We present spatially resolved radio-frequency spectroscopy of a trapped Fermi

gas with resonant interactions and observe a spectral gap at low temperatures.

The spatial distribution of the spectral response of the trapped gas is

obtained using in situ phase-contrast imaging and 3D image reconstruction. At

the lowest temperature, the homogeneous rf spectrum shows an asymmetric

excitation line shape with a peak at 0.48(4)$\epsilon_F$ with respect to the

free atomic line, where $\epsilon_F$ is the local Fermi energy.

\\ ( http://arxiv.org/abs/0705.3858 , 606kb)

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arXiv:0705.3900

Date: Sat, 26 May 2007 16:49:15 GMT (74kb)

Title: Spatially Inhomogeneous Superconducting and Bosonic Networks With

Emergent Complex Behaviors

Authors: F. P. Mancini, P. Sodano, A. Trombettoni

Categories: cond-mat.supr-con cond-mat.dis-nn

Comments: invited review paper, 32 pages, 8 figures

Report-no: DFUPFG: 39-07

Journal-ref: Int. J. Mod. Phys. B21, 1 (2007)

\\

The spontaneous emergence of enhanced responses and local orders are

properties often associated with complex matter where nonlinearities and

spatial inhomogeneities dominate. We discuss these phenomena in quantum devices

realized with superconducting Josephson junction networks and cold atoms in

optical lattices. We evidence how the pertinent engineering of the network's

shape induces the enhancement of the zero-voltage Josephson critical currents

in superconducting arrays as well as the emergence of spatially localized

condensates for cold atoms in inhomogeneous optical lattices.

\\ ( http://arxiv.org/abs/0705.3900 , 74kb)

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arXiv:0705.3935

Date: Sun, 27 May 2007 07:28:36 GMT (95kb)

Title: Conversion of two-species atoms into stable Molecules

Authors: Li-Hua Lu and You-Quan Li

Categories: cond-mat.soft cond-mat.other

Comments: Revtex, 5 pages, 2 figures

\\

We study the conversion of two-species atoms into stable molecules through

the stimulated Raman adiabatic passage in photoassociation assisted by Feshbach

resonance. Starting with the mean-field Langrange density, we show the

conversion efficiency is large for the fully bosonic system as well as the

boson-fermion mixture as long as the general two-photon resonance condition is

satisfied. We also study the influence of the population imbalance on the

atom-to-molecule conversion.

\\ ( http://arxiv.org/abs/0705.3935 , 95kb)

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arXiv:0705.3956

Date: Sun, 27 May 2007 14:32:28 GMT (25kb)

Title: Boson Mott insulators at finite temperatures

Authors: Fabrice Gerbier (LKB - Lhomond)

Categories: cond-mat.other

Proxy: ccsd hal-00149582

\\

We discuss the finite temperature properties of ultracold bosons in optical

lattices in the presence of an additional, smoothly varying potential, as in

current experiments. Three regimes emerge in the phase diagram: a

low-temperature Mott regime similar to the zero-temperature quantum phase, an

intermediate regime where MI features persist, but where superfluidity is

absent, and a thermal regime where features of the Mott insulator state have

disappeared. We obtain the thermodynamic functions of the Mott phase in the

latter cases. The results are used to estimate the temperatures achieved by

adiabatic loading in current experiments. We point out the crucial role of the

trapping potential in determining the final temperature, and suggest a scheme

for further cooling by adiabatic decompression.

\\ ( http://arxiv.org/abs/0705.3956 , 25kb)

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arXiv:nlin/0611007 (*cross-listing*)

Date: Fri, 3 Nov 2006 19:38:30 GMT (363kb)

Date (revised v2): Mon, 28 May 2007 06:16:27 GMT (601kb)

Title: Change in the adiabatic invariant in a nonlinear two-mode model of

Feshbach resonance passage

Authors: A.P. Itin, A.A. Vasiliev, S. Watanabe, and G.Krishna

Categories: nlin.CD cond-mat.other quant-ph

Comments: 17 pages, 4 figures

\\

Mean-field approach has recently been used to model coupled atom-molecular

Bose-Einstein condensates (BEC) and coupled Fermi-Bose condensates near

Feshbach resonance. Sweeping of magnetic field across the resonance gives a new

(nonlinear) version of Landau-Zener problem. We investigate the structure of

the corresponding classical phase space and calculate change in the action

which corresponds to finite-rate efficiency of the sweep. We consider the case

of non-zero initial action, which corresponds to some finite initial molecular

fraction.

\\ ( http://arxiv.org/abs/nlin/0611007 , 601kb)

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arXiv:0705.4040

Date: Mon, 28 May 2007 13:01:02 GMT (104kb)

Title: Many-body theory of excitation dynamics in an ultracold Rydberg gas

Authors: Cenap Ates, Thomas Pohl, Thomas Pattard and Jan M. Rost

Categories: physics.atom-ph

Comments: 12 pages, 8 figures

\\

We develop a theoretical approach for the dynamics of Rydberg excitations in

ultracold gases, with a realistically large number of atoms. We rely on the

reduction of the single-atom Bloch equations to rate equations, which is

possible under various experimentally relevant conditions. Here, we explicitly

refer to a two-step excitation-scheme. We discuss the conditions under which

our approach is valid by comparing the results with the solution of the exact

quantum master equation for two interacting atoms. Concerning the emergence of

an excitation blockade in a Rydberg gas, our results are in qualitative

agreement with experiment. Possible sources of quantitative discrepancy are

carefully examined. Based on the two-step excitation scheme, we predict the

occurrence of an antiblockade effect and propose possible ways to detect this

excitation enhancement experimentally in an optical lattice as well as in the

gas phase.

\\ ( http://arxiv.org/abs/0705.4040 , 104kb)

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arXiv:0705.4024

Date: Mon, 28 May 2007 10:19:46 GMT (15kb)

Title: Ground state of the time-independent Gross-Pitaevskii equation

Authors: Claude M. Dion and Eric Cances

Categories: physics.comp-ph physics.atom-ph

\\

We present a suite of programs to determine the ground state of the

time-independent Gross-Pitaevskii equation, used in the simulation of

Bose-Einstein condensates. The calculation is based on the Optimal Damping

Algorithm, ensuring a fast convergence to the true ground state. Versions are

given for the one-, two-, and three-dimensional equation, using either a

spectral method, well suited for harmonic trapping potentials, or a spatial

grid.

\\ ( http://arxiv.org/abs/0705.4024 , 15kb)

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arXiv:0705.4135

Date: Tue, 29 May 2007 02:52:48 GMT (370kb)

Title: Spatial pair correlations of atoms in molecular dissociation

Authors: C.M. Savage and K.V. Kheruntsyan

Categories: cond-mat.other

Comments: 4 pages

\\

We perform first-principles quantum simulations of dissociation of trapped,

spatially inhomogeneous Bose-Einstein condensates of molecular dimers using the

positive-P representation method. Specifically, we study spatial pair

correlations of atoms produced in dissociation and analyze different

correlation measures after time of flight. These include Glauber's

density-density correlation and number-difference squeezing in spatial column

densities which correspond to the experimental method of shot noise

spectroscopy in absorption images. We find that the strength of the observable

correlations may significantly degrade in systems with strong spatial

inhomogeneity compared to the predictions of idealized uniform models. We show

how binning of the signal can enhance the detectable correlations and lead to

the violation of the classical Cauchy-Schwartz inequality.

\\ ( http://arxiv.org/abs/0705.4135 , 370kb)

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arXiv:0705.4164

Date: Tue, 29 May 2007 08:49:30 GMT (202kb)

Title: Formation of a condensed state with macroscopic number of phonons in

ultracold Bose gases

Authors: Yu. Kagan and L.A. Manakova

Categories: cond-mat.other

Comments: 9 pages, 8 figures

\\

A mechanism for the formation of a new type of stationary state with

macroscopical number of phonons in condensed atomic gases is proposed. This

mechanism is based on generating longitudinal phonons as a result of parametric

resonance caused by a permanent modulation of the transverse trap frequency in

an elongated trap. The phonon-phonon interaction predetermines the

self-consistent evolution which is completed with macroscopic population of one

from all levels within the energy interval of parametric amplification. This

level proves to be shifted to the edge of this interval. All other levels end

the evolution with zero population.

\\ ( http://arxiv.org/abs/0705.4164 , 202kb)

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arXiv:0705.4174

Date: Tue, 29 May 2007 09:33:30 GMT (154kb)

Title: Comment on ``Coupled dynamics of atoms and radiation--pressure--driven

interferometers''

Authors: J. K. Asboth, P. Domokos

Categories: quant-ph

Comments: A long comment on the recent Meiser-Meystre papers on the

"super-strong coupling" regime. Submitted to PRA

\\

In two recent articles, Meiser and Meystre describe the coupled dynamics of a

dense gas of atoms and an optical cavity pumped by a laser field. They make two

important simplifying assumptions: (i) the gas of atoms forms a regular lattice

and can be replaced by a fictitious mirror, and (ii) the atoms strive to

minimize the dipole potential. We show that the two assumptions are

inconsistent: the configuration of atoms minimizing the dipole potential is not

a perfect lattice. Assumption (ii) is erroneous, as in the strong coupling

regime the dipole force does not arise from the dipole potential. The real

steady state, where the dipole forces vanish, is indeed a regular lattice.

Furthermore, the bistability predicted by Meiser and Meystre does not occur in

this system.

\\ ( http://arxiv.org/abs/0705.4174 , 154kb)

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arXiv:0705.4322

Date: Wed, 30 May 2007 01:00:01 GMT (93kb)

Title: Sound speed of a Bose-Einstein condensate in an optical lattice

Authors: Z. X. Liang, Xi Dong, Z. D. Zhang, and Biao Wu

Categories: cond-mat.other

Comments: 15pages 6 figures

\\

The speed of sound of a Bose-Einstein condensate in an optical lattice is

studied both analytically and numerically in all three dimensions. Our

investigation shows that the sound speed depends strongly on the strength of

the lattice. In the one-dimensional case, the speed of sound falls

monotonically with increasing lattice strength. The dependence on lattice

strength becomes much richer in two and three dimensions. In the

two-dimensional case, when the interaction is weak, the sound speed first

increases then decreases as the lattice strength increases. For the three

dimensional lattice, the sound speed can even oscillate with the lattice

strength. These rich behaviors can be understood in terms of compressibility

and effective mass. Our analytical results at the limit of weak lattices also

offer an interesting perspective to the understanding: they show the lattice

component perpendicular to the sound propagation increases the sound speed

while the lattice components parallel to the propagation decreases the sound

speed. The various dependence of the sound speed on the lattice strength is the

result of this competition.

\\ ( http://arxiv.org/abs/0705.4322 , 93kb)

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arXiv:0705.4335

Date: Wed, 30 May 2007 04:22:02 GMT (179kb)

Title: Effective Theory for Trapped Few-Fermion Systems

Authors: I. Stetcu, B. R. Barrett, U. van Kolck, and J. P. Vary

Categories: cond-mat.other

Comments: 8 pages, 5 figures

Report-no: LA-UR-07-3398

\\

We apply the general principles of effective field theories to the

construction of effective interactions suitable for few- and many-body

calculations in a no-core shell model framework. We calculate the spectrum of

systems with three and four two-component fermions in a harmonic trap. In the

unitary limit, we find that three-particle results are within 10% of known

semi-analytical values even in small model spaces. The method is very general,

and can be readily extended to other regimes, more particles, different species

(e.g., protons and neutrons in nuclear physics), or more-component fermions (as

well as bosons). As an illustration, we present calculations of the

lowest-energy three-fermion states away from the unitary limit and find a

possible inversion of parity in the ground state in the limit of trap size

large compared to the scattering length. Furthermore, we investigate the lowest

positive-parity states for four fermions, although we are limited by the

dimensions we can currently handle in this case.

\\ ( http://arxiv.org/abs/0705.4335 , 179kb)

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arXiv:0705.4352

Date: Wed, 30 May 2007 12:02:13 GMT (275kb)

Title: Signal of Bose condensation in an optical lattice at finite temperature

Authors: W. Yi, G.-D. Lin, and L.-M. Duan

Categories: cond-mat.other

Comments: 4 pages, 2 figures

\\

We discuss the experimental signal for the Bose condensation of cold atoms in

an optical lattice at finite temperature. Instead of using the visibility of

the interference pattern via the time-of-flight imaging, we show that the

momentum space density profile in the first Brillouin zone, in particular its

bimodal distribution, provides an unambiguous signal for the Bose condensation.

We confirm this point with detailed calculation of the change in the atomic

momentum distribution across the condensation phase transition, taking into

account both the global trapping potential and the atomic interaction effects.

\\ ( http://arxiv.org/abs/0705.4352 , 275kb)

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arXiv:0705.4425

Date: Wed, 30 May 2007 16:42:01 GMT (25kb)

Title: High-precision study of Cs polarizabilities

Authors: E. Iskrenova-Tchoukova, M. S. Safronova, (University of Delaware), and

U. I. Safronova (University of Nevada, Reno)

Categories: physics.atom-ph

Comments: 19 pages

\\

We present results of the first-principles calculation of Cs dipole static

polarizabilities for the Ns (N = 6 - 12), Np_j (N = 6 - 10), and Nd_j (N = 5 -

10) states using the relativistic all-order method. In our implementation of

the all-order method, single and double excitations of Dirac-Fock wave

functions are included to all orders in perturbation theory. Additional

calculations are carried out for the dominant terms and the uncertainties of

our final values are estimated for all states. A comprehensive review of the

existing theoretical and experimental studies of the Cs polarizabilities is

also carried out. Our results are compared with other values where they are

available. These calculations provide a theoretical benchmark for a large

number of Cs polarizabilities.

\\ ( http://arxiv.org/abs/0705.4425 , 25kb)

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arXiv:0705.4428

Date: Wed, 30 May 2007 16:51:16 GMT (232kb)

Title: Electron electric dipole moment experiment using electric-field

quantized slow cesium atoms

Authors: Jason M. Amini, Charles T. Munger Jr., and Harvey Gould

Categories: physics.atom-ph

Comments: 9 pages, 8 figures, accepted for publication in Phys. Rev. A

\\

A proof-of-principle electron electric dipole moment (e-EDM) experiment using

slow cesium atoms, nulled magnetic fields, and electric field quantization has

been performed. With the ambient magnetic fields seen by the atoms reduced to

less than 200 pT, an electric field of 6 MV/m lifts the degeneracy between

states of unequal mF and, along with the low (approximately 3 m/s) velocity,

suppresses the systematic effect from the motional magnetic field. The low

velocity and small residual magnetic field have made it possible to induce

transitions between states and to perform state preparation, analysis, and

detection in regions free of applied static magnetic and electric fields. This

experiment demonstrates techniques that may be used to improve the e-EDM limit

by two orders of magnitude, but it is not in itself a sensitive e-EDM search,

mostly due to limitations of the laser system.

\\ ( http://arxiv.org/abs/0705.4428 , 232kb)

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arXiv:0705.4462

Date: Thu, 31 May 2007 16:20:16 GMT (22kb)

Title: Two-parameter scaling of correlation functions near continuous phase

transitions

Authors: Nils Hasselmann, Andreas Sinner, and Peter Kopietz

Categories: cond-mat.stat-mech

Comments: 4 pages, 5 figures

\\

We show that the order parameter correlation function in the vicinity of

continuous phase transitions quite generally has a two-parameter scaling form

G(k)=k_c^{-2} g(k\xi,k/k_c), where k is the wave-vector, \xi is the correlation

length, and the interaction-dependent non-universal momentum scale k_c remains

finite at the critical fixed point. One-parameter scaling is recovered only in

the limit k/k_c\to 0. The dependence on the second scale k_c cannot be obtained

from the usual linearization of the renormalization group flow in the vicinity

of the critical fixed point but derives from the properties of the critical

surface itself. We present an approximate calculation of g(x,y) for the Ising

universality class using the functional renormalization group.

\\ ( http://arxiv.org/abs/0705.4462 , 22kb)

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arXiv:0705.4513

Date: Thu, 31 May 2007 14:34:37 GMT (314kb,D)

Title: Pair correlated atoms with a twist

Authors: Uffe V. Poulsen and Klaus Molmer

Categories: cond-mat.other

Comments: 9 pages, to be published in PRA with higher quality figures

\\

We present an analysis of the quantum state resulting from the dissociation

of diatomic molecules prepared in a condensate vortex state. The many-body

state preserves the rotational symmetry of the system in quantum correlated

states by having two equally populated components with angular momentum adding

to unity. A simple two-mode analysis and a full quantum field analysis is

presented for the case of non-interacting atoms and weak depletion of the

molecular condensate.

\\ ( http://arxiv.org/abs/0705.4513 , 314kb)

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arXiv:0705.4647

Date: Thu, 31 May 2007 18:59:12 GMT (89kb)

Title: Bell's inequality and universal quantum gates in a cold atom chiral

fermionic p-wave superfluid

Authors: Chuanwei Zhang, Sumanta Tewari, S. Das Sarma

Categories: quant-ph

Comments: 4+ pages, 3 figures

\\

We propose and analyze a probabilistic scheme to entangle two spatially

separated topological qubits in a $p_{x}+ip_{y}$ superfluid using controlled

collisions between atoms in movable dipole traps and unpaired atoms inside

vortex cores in the superfluid. We discuss how to test the violation of Bell's

inequality with the generated entanglement. A set of universal quantum gates is

shown to be implementable \textit{deterministically} using the entanglement

despite the fact that the entangled states can only be created

probabilistically.

\\ ( http://arxiv.org/abs/0705.4647 , 89kb)

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arXiv:0705.4544

Date: Thu, 31 May 2007 09:10:30 GMT (194kb)

Title: Versatile compact atomic source for high resolution dual atom

interferometry

Authors: T. M\"{u}ller, T. Wendrich, M. Gilowski, C. Jentsch, E.M. Rasel, and

W. Ertmer

Categories: physics.atom-ph

Comments: uses revtex4, 9 pages, 12 figures, submitted to Phys. Rev. A

\\

We present a compact $^{87}$Rb atomic source for high precision dual atom

interferometers. The source is based on a double-stage magneto-optical trap

(MOT) design, consisting of a 2-dimensional (2D)-MOT for efficient loading of a

3D-MOT. The accumulated atoms are precisely launched in a horizontal moving

molasses. Our setup generates a high atomic flux ($>10^{10}$ atoms/s) with

precise and flexibly tunable atomic trajectories as required for high

resolution Sagnac atom interferometry. We characterize the performance of the

source with respect to the relevant parameters of the launched atoms, i.e.

temperature, absolute velocity and pointing, by utilizing time-of-flight

techniques and velocity selective Raman transitions.

\\ ( http://arxiv.org/abs/0705.4544 , 194kb)

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The replacements:

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arXiv:cond-mat/0702290

replaced with revised version Thu, 24 May 2007 21:19:50 GMT (36kb)

Title: New Calculations of Recombination Rates for Cold $^4$He Atoms and

Determination of Universal Scaling Functions

Authors: J.R.Shepard

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

Comments: 15 pages, 5 figures

\\ ( http://arxiv.org/abs/cond-mat/0702290 , 36kb)

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arXiv:cond-mat/0608172

replaced with revised version Mon, 28 May 2007 15:52:10 GMT (38kb)

Title: Comment on "Superfluid stability in the BEC-BCS crossover"

Authors: Daniel E. Sheehy and Leo Radzihovsky (University of Colorado)

Categories: cond-mat.supr-con

Comments: 4 pages, 2 figures. Version in PRB

Journal-ref: Phys. Rev. B 75, 136501 (2007)

\\ ( http://arxiv.org/abs/cond-mat/0608172 , 38kb)

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arXiv:cond-mat/0610071

replaced with revised version Mon, 28 May 2007 14:57:36 GMT (359kb)

Title: Ground states of spin-3 Bose-Einstein condensates for conserved

magnetization

Authors: Harri M\"akel\"a, Kalle-Antti Suominen

Categories: cond-mat.other

Comments: 8 pages, 4 figures; typos corrected, published version

Journal-ref: Phys. Rev. A 75, 033610 (2007)

\\ ( http://arxiv.org/abs/cond-mat/0610071 , 359kb)

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arXiv:cond-mat/0702034

replaced with revised version Sun, 27 May 2007 20:36:43 GMT (259kb)

Title: Species-specific optical lattices

Authors: L. J. LeBlanc and J. H. Thywissen

Categories: cond-mat.stat-mech

Comments: 10 pages, 4 figures; v3: published version

Journal-ref: Phys. Rev. A, 75, 053612 (2007)

DOI: 10.1103/PhysRevA.75.053612

\\ ( http://arxiv.org/abs/cond-mat/0702034 , 259kb)

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arXiv:cond-mat/0610767

Date: Fri, 27 Oct 2006 14:42:46 GMT (910kb)

Date (revised v2): Tue, 14 Nov 2006 06:56:47 GMT (972kb)

Date (revised v3): Sun, 27 May 2007 07:41:33 GMT (966kb)

Title: Universality in nonadiabatic behaviour of classical actions in nonlinear

models with separatrix crossings

Authors: A.P. Itin, S. Watanabe

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

Comments: Accepted for publication in Physical Review E; Several misprints are

corrected; main results are emphasized in the end of Introduction (including

finite conversion efficiency in Feshbach resonance passage due to geometric

jump in the action); bibliography is extended

\\

We discuss dynamics of approximate adiabatic invariants in several nonlinear

models being related to physics of Bose-Einstein condensates (BEC). We show

that nonadiabatic dynamics in Feshbach resonance passage, nonlinear

Landau-Zener (NLZ) tunnelling, and BEC tunnelling oscillations in a double-well

can be considered within a unifying approach based on the theory of separatrix

crossings. The separatrix crossing theory was applied previously to some

problems of classical mechanics, plasma physics and hydrodynamics, but has not

been used in the rapidly growing BEC-related field yet. We derive explicit

formulas for the change in the action in several models. Extensive numerical

calculations support the theory and demonstrate its universal character. We

also discovered a qualitatively new nonlinear phenomenon in a NLZ model which

we propose to call {\em separated adiabatic tunnelling}

\\ ( http://arxiv.org/abs/cond-mat/0610767 , 966kb)

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arXiv:cond-mat/0609063

replaced with revised version Wed, 30 May 2007 15:25:43 GMT (482kb)

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

of ultracold fermions

Authors: Olivier Juillet (LPCC)

Categories: cond-mat.other

Comments: Accepted for publication in New Journal of Physics

\\ ( http://arxiv.org/abs/cond-mat/0609063 , 482kb)

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arXiv:cond-mat/0611312

replaced with revised version Wed, 30 May 2007 10:40:17 GMT (25kb)

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

Authors: Tarun Kanti Ghosh and Kazushige Machida

Categories: cond-mat.other

Comments: 7 pages, 5 figures, to appear in Journal of Physics B: Atomic,

Molecular & Optical Physics

\\ ( http://arxiv.org/abs/cond-mat/0611312 , 25kb)

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arXiv:cond-mat/0612030

replaced with revised version Wed, 30 May 2007 14:32:35 GMT (28kb)

Title: Strongly correlated fermions after a quantum quench

Authors: S.R. Manmana, S. Wessel, R.M. Noack, and A. Muramatsu

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

Comments: 4 pages, 5 figures, published version

Journal-ref: Phys. Rev. Lett. 98, 210405 (2007)

DOI: 10.1103/PhysRevLett.98.210405

\\ ( http://arxiv.org/abs/cond-mat/0612030 , 28kb)

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arXiv:cond-mat/0701788

replaced with revised version Tue, 29 May 2007 20:02:39 GMT (152kb)

Title: Flat bands and Wigner crystallization in the honeycomb optical lattice

Authors: Congjun Wu, Doron Bergman, Leon Balents, and S. Das Sarma

Categories: cond-mat.str-el cond-mat.mes-hall

Comments: 5 pages

\\ ( http://arxiv.org/abs/cond-mat/0701788 , 152kb)

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arXiv:cond-mat/0702223

replaced with revised version Wed, 30 May 2007 17:37:21 GMT (117kb)

Title: Coherent state path integral and super-symmetry for condensates composed

of bosonic and fermionic atoms

Authors: Bernhard Mieck

Categories: cond-mat.stat-mech

Comments: 123 pages; accepted for publication in "Progress of Physics" on 8th

May 2007; (3rd revised, checked version of 4th May 2007); (submission date to

"Progress of Physics" 21 Feb. 2007)

\\ ( http://arxiv.org/abs/cond-mat/0702223 , 117kb)

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arXiv:cond-mat/0606771

replaced with revised version Thu, 31 May 2007 13:16:11 GMT (2666kb)

Title: Ultracold atomic gases in optical lattices: mimicking condensed matter

physics and beyond

Authors: Maciej Lewenstein, Anna Sanpera, Veronica Ahufinger, Bogdan Damski,

Aditi Sen De, Ujjwal Sen

Categories: cond-mat.other quant-ph

Comments: Review article. v2: published version, 135 pages, 34 figures

Report-no: LAUR-06-4002

Journal-ref: Advances in Physics Vol. 56 Nos. 1-2, January-April 2007, 243-379

DOI: 10.1080/00018730701223200

\\ ( http://arxiv.org/abs/cond-mat/0606771 , 2666kb)

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arXiv:cond-mat/0609706

replaced with revised version Thu, 31 May 2007 16:26:52 GMT (21kb)

Title: Interacting bosons in a nearly-resonant potential well

Authors: Joseph P. Straley and Eugene B. Kolomeisky

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

Comments: 6 pages, 3 figures. Minor changes, version to appear in PRA

\\ ( http://arxiv.org/abs/cond-mat/0609706 , 21kb)

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Till next time,

Matt.

-- ========================================================================= Dr M. J. Davis, Senior Lecturer in Physics School of Physical Sciences, email: mdavis_at_physics.uq.edu.au University of Queensland, ph : +61 7 334 69824 Brisbane, QLD 4072, fax : +61 7 336 51242 Australia. http://www.physics.uq.edu.au/people/mdavis/ ========================================================================= Matt's arXiv selection: weekly summary of cold-atom papers from arXiv.org http://www.physics.uq.edu.au/people/mdavis/matts_arXiv/ ========================================================================= Legal stuff: Unless stated otherwise, this e-mail represents only the views of the sender and not the views of the University of Queensland =========================================================================Received on Wed Jun 06 2007 - 02:59:48 EST

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