# Matts's arXiv selection: week ending 1st June 2007.

From: Matthew Davis <mdavis_at_physics.uq.edu.au>
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
\\
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
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
\\
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
\\
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
\\
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
\\
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
\\
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
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
\\
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
\\
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
\\
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
\\
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
\\ ( 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"
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
\\ ( 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,
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/
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http://www.physics.uq.edu.au/people/mdavis/matts_arXiv/
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Received on Wed Jun 06 2007 - 02:59:48 EST

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