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

Date: Mon, 6 Nov 2006 17:42:40 +1000 (EST)

Date: Mon, 6 Nov 2006 17:42:40 +1000 (EST)

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

Hi everyone,

I've recovered from my week of illness, and managed to cobble together the

abstract's from a couple of weeks ago. Last week's abstracts will follow

shortly.

*>From this week the subject lines are changing to reflect when the abstracts are
*

from, rather than when I get around to sending this email.

Homepage: http://www.physics.uq.edu.au/people/mdavis/matts_arXiv/

A total of 23 new abstracts for this week:

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Paper: cond-mat/0610575

Date: Fri, 20 Oct 2006 12:59:51 GMT (15kb)

Title: Probing Anomalous Longitudinal Fluctuations of the Interacting Bose Gas

via Bose-Einstein Condensation of Magnons

Authors: Andreas Kreisel, Nils Hasselmann, and Peter Kopietz

Comments: 4 pages, 1 figure

Subj-class: Statistical Mechanics; Strongly Correlated Electrons

\\

The emergence of a finite staggered magnetization in quantum Heisenberg

antiferromagnets subject to a uniform magnetic field can be viewed as

Bose-Einstein condensation of magnons. Using non-perturbative results for the

infrared behavior of the interacting Bose gas, we present exact results for the

staggered spin-spin correlation functions of quantum antiferromagnets in a

magnetic field at zero temperature. In particular, we show that in dimensions 1

< D <= 3 the longitudinal dynamic structure factor S_parallel(q,omega)

describing staggered spin fluctuations in the direction of the staggered

magnetization exhibits a critical continuum whose weight can be controlled

experimentally by varying the magnetic field.

\\ ( http://arXiv.org/abs/cond-mat/0610575 , 15kb)

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Paper: cond-mat/0610582

Date: Fri, 20 Oct 2006 19:49:24 GMT (517kb)

Title: Stability of Bose-Einstein condensates in a Kronig-Penney potential

Authors: Ippei Danshita and Shunji Tsuchiya

Comments: 32 pages, 21 figures

Subj-class: Other

\\

We study the stability of Bose-Einstein condensates with superfluid currents

in a one-dimensional periodic potential. By using the Kronig-Penney model, the

condensate and Bogoliubov bands are analytically calculated and the stability

of condensates in a periodic potential is discussed. The Landau and dynamical

instabilities occur in a Kronig-Penney potential when the quasimomentum of the

condensate exceeds certain critical values as in a sinusoidal potential. It is

found that the onsets of the Landau and dynamical instabilities coincide with

the point where the perfect transmission of low energy excitations through each

potential barrier is forbidden. The Landau instability is caused by the

excitations with small $q$ and the dynamical instability is caused by the

excitations with $q=\pi/a$ at their onsets, where $q$ is the quasimomentum of

excitation and $a$ is the lattice constant. A swallow-tail energy loop appears

at the edge of the first condensate band when the mean-field energy is

sufficiently larger than the strength of the periodic potential. We find that

the upper portion of the swallow-tail is always dynamically unstable, but the

second Bogoliubov band has a phonon spectrum reflecting the positive effective

mass.

\\ ( http://arXiv.org/abs/cond-mat/0610582 , 517kb)

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Paper (*cross-listing*): hep-ph/0610237

Date: Wed, 18 Oct 2006 16:16:53 GMT (29kb)

Title: Superfluidity in many fermion systems: Exact renormalisation group

treatment

Authors: Boris Krippa

Comments: Talk given at the IVth International Conference on Quarks and Nuclear

Physics (QNP06), Madrid, 5-10 June 2006

Subj-class: High Energy Physics - Phenomenology; Superconductivity

\\

The application of the exact renormalisation group to symmetric as well as

asymmetric many-fermion systems with a short-range attractive force is studied.

Assuming an ansatz for the effective action with effective bosons, describing

pairing effects a set of approximate flow equations for the effective coupling

including boson and fermionic fluctuations has been derived. The phase

transition to a phase with broken symmetry is found at a critical value of the

running scale. The mean-field results are recovered if boson-loop effects are

omitted. The calculations with two different forms of the regulator are shown

to lead to a similar results. We find that, being quite small in the case of

the symmetric many-fermion system the corrections to mean field approximation

becomes more important with increasing mass asymmetry.

\\ ( http://arXiv.org/abs/hep-ph/0610237 , 29kb)

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Paper: physics/0610132

Date: Wed, 18 Oct 2006 14:00:08 GMT (162kb)

Title: Efficient Monte Carlo Calculations of the One-Body Density

Authors: Roland Assaraf (LCT), Michel Caffarel (LPQ), Anthony Scemama (CERMICS)

Comments: 12 pages with 3 postscript figures

Proxy: ccsd ccsd-00107403

Report-no: LCPQ-2006

Subj-class: Computational Physics; Statistical Mechanics

\\

An alternative Monte Carlo estimator for the one-body density rho(r) is

presented. This estimator has a simple form and can be readily used in any type

of Monte Carlo simulation. Comparisons with the usual regularization of the

delta-function on a grid show that the statistical errors are greatly reduced.

Furthermore, our expression allows accurate calculations of the density at any

point in space, even in the regions never visited during the Monte Carlo

simulation. The method is illustrated with the computation of accurate

Variational Monte Carlo electronic densities for the Helium atom (1D curve) and

for the water dimer (3D grid containing up to 51x51x51=132651 points).

\\ ( http://arXiv.org/abs/physics/0610132 , 162kb)

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Paper: quant-ph/0610166

Date: Thu, 19 Oct 2006 22:50:01 GMT (204kb)

Title: Tunneling resonances and entanglement dynamics of cold bosons in the

double well

Authors: D. R. Dounas-Frazer and L. D. Carr

Comments: 4 pages, 4 figures

\\

We present exact expressions for the quantum sloshing of ultracold bosons in

a tilted two-well potential. Tunneling is suppressed by a small potential

difference between wells, or tilt. However, tunneling resonances occur for

critical values of the tilt when the barrier is high. At resonance, tunneling

times on the order of 10-100 ms are possible. Furthermore, tunneling resonances

constitute a dynamic scheme for creating robust few-atom entangled states in

the presence of many bosons.

\\ ( http://arXiv.org/abs/quant-ph/0610166 , 204kb)

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Paper: cond-mat/0610609

Date: Mon, 23 Oct 2006 06:31:40 GMT (37kb)

Title: Symmetry-breaking self-consistent quantum many-body structure of

high-lying macroscopic self-trapped and superposition states of the gaseous

double-well BEC

Authors: David J. Masiello and William P. Reinhardt

Comments: 5 pages, 3 figures

Subj-class: Other

\\

The many-body structure of high-lying excited states, including macroscopic

quantum superpositions, of the gaseous double-well BEC is presented within the

context of a multiconfigurational bosonic self-consistent field theory based

upon underlying symmetry-broken one-body wave functions. To better understand

our initial results, a model is constructed in the extreme Fock state limit, in

which macroscopic quantum self-trapped and superposition states emerge in the

many-body spectrum, striking a delicate balance between the degree of symmetry

breaking, the effects of the condensate's mean field, and that of atomic

correlation. It is found that, in general, the superposition state lies

energetically below its related self-trapped counterpart. Furthermore,

noticeably different spatial density profiles are associated with each type of

excited state.

\\ ( http://arXiv.org/abs/cond-mat/0610609 , 37kb)

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Paper: cond-mat/0610610

Date: Mon, 23 Oct 2006 07:41:34 GMT (303kb)

Title: Phase Diagram of Asymmetric Fermion Superfluid Including Single-Species

Pairing

Authors: Xuguang Huang, Xuewen Hao and Pengfei Zhuang

Comments: 4 pages, 4 figures

Subj-class: Superconductivity

\\

We investigate an asymmetric two-species fermion superfluid in which the

fermions from the same species form Cooper pairs as well. For the case with

fixed fermion numbers, the double- and single-species pairings can coexist at

low temperature, and the introduction of the single-species pairing changes

significantly the phase diagram with various homogeneous and inhomogeneous

condensed states.

\\ ( http://arXiv.org/abs/cond-mat/0610610 , 303kb)

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Paper: cond-mat/0610623

Date: Mon, 23 Oct 2006 13:51:50 GMT (26kb)

Title: A number-conserving approach to a minimal self-consistent treatment of

condensate and non-condensate dynamics in a degenerate Bose gas

Authors: S. A. Gardiner and S.A. Morgan

Comments: 17 pages

Subj-class: Other

\\

We describe a number conserving approach to the dynamics of Bose-Einstein

condensed dliute atomic gases. This builds upon the works of Gardiner [C. W.

Gardiner, Phys. Rev. A \textbf{56}, 1414 (1997)], and Castin and Dum [Y. Castin

and R. Dum, Phys. Rev. A \textbf{57}, 3008 (1998)]. We consider what is

effectively an expansion in inverse powers of the number of condensate

particles, rather than the total number of particles. This requires the number

of condensate particles to be considered large, but not necessarily almost

equal to the total number of particles in the system. We argue that a

second-order treatment of the relevant dynamical equations of motion is the

minimum order necessary to provide consistent coupled condensate and

non-condensate number dynamics for a finite total number of particles, and show

that such a second-order treatment is provided by a suitably generalized

Gross-Pitaevskii equation, coupled to the Castin-Dum number-conserving

formulation of the Bogoliubov-de Gennes equations. The necessary equations of

motion can be generated from an approximate third-order Hamiltonian, which

effectively reduces to second order in the steady state. Such a treatment as

described here is suitable for dynamics at occurring at finite temperature,

where there is a significant non-condensate fraction from the outset, or

dynamics leading to dynamical instabilities, where depletion of the condensate

can also lead to a significant non-condensate fraction, even if the

non-condensate fraction is initially negligible.

\\ ( http://arXiv.org/abs/cond-mat/0610623 , 26kb)

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Paper: cond-mat/0610637

Date: Mon, 23 Oct 2006 17:58:26 GMT (292kb)

Title: Dropping cold quantum gases on Earth over long times and large distances

Authors: G. Nandi, R. Walser, E. Kajari, and W.P. Schleich

Comments: 18 pages latex, 5 eps figures, submitted

Subj-class: Other

\\

We describe the non-relativistic time evolution of an ultra-cold degenerate

quantum gas (bosons/fermions) falling in Earth's gravity during long times (10

sec) and over large distances (100 m). This models a drop tower experiment that

is currently performed by the QUANTUS collaboration at ZARM (Bremen, Germany).

Starting from the classical mechanics of the drop capsule and a single particle

trapped within, we develop the quantum field theoretical description for this

experimental situation in an inertial frame, the corotating frame of the Earth,

as well as the comoving frame of the drop capsule. Suitable transformations

eliminate non-inertial forces, provided all external potentials (trap, gravity)

can be approximated with a second order Taylor expansion around the

instantaneous trap center. This is an excellent assumption and the harmonic

potential theorem applies. As an application, we study the quantum dynamics of

a cigar-shaped Bose-Einstein condensate in the Gross-Pitaevskii mean-field

approximation. Due to the instantaneous transformation to the rest-frame of the

superfluid wave packet, the long-distance drop (100m) can be studied easily on

a numerical grid.

\\ ( http://arXiv.org/abs/cond-mat/0610637 , 292kb)

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Paper: cond-mat/0610644

Date: Mon, 23 Oct 2006 19:28:13 GMT (173kb)

Title: Non-diffusive phase spreading of a Bose-Einstein condensate at finite

temperature

Authors: Alice Sinatra (LKB - Lhomond), Yvan Castin (LKB - Lhomond), Emilia

Witkowska

Comments: 13 pages, 7 figures

Proxy: ccsd hal-00109021

Subj-class: Other

\\

We show that the phase of a condensate in a finite temperature gas spreads

linearly in time at long times rather than in a diffusive way. This result is

supported by classical field simulations, and analytical calculations which are

generalized to the quantum case. We show that this super-diffusive behavior is

intimately related to conservation of energy during the free evolution of the

system and to fluctuations of energy in the prepared initial state.

\\ ( http://arXiv.org/abs/cond-mat/0610644 , 173kb)

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Paper: physics/0610194

Date: Mon, 23 Oct 2006 16:06:03 GMT (178kb)

Title: Controlling ultracold Rydberg atoms in the quantum regime

Authors: Bernd Hezel, Igor Lesanovsky, Peter Schmelcher

Subj-class: Atomic Physics

\\

We discuss the properties of Rydberg atoms in a magnetic Ioffe-Pritchard trap

being commonly used in ultracold atomic physics experiments. The Hamiltonian is

derived and it is demonstrated how tight traps alter the coupling of the atom

to the magnetic field. We solve the underlying Schroedinger equation of the

system within a given n-manifold and show that for a sufficiently large Ioffe

field strength the 2n^2-dimensional system of coupled Schroedinger equations

decays into several decoupled multicomponent equations governing the center of

mass motion. An analysis of the fully quantized center of mass and electronic

states is undertaken. In particular, we discuss the situation of tight center

of mass confinement outlining the procedure to generate a low-dimensional

ultracold Rydberg gas.

\\ ( http://arXiv.org/abs/physics/0610194 , 178kb)

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Paper: cond-mat/0610659

Date: Tue, 24 Oct 2006 08:27:03 GMT (20kb)

Title: Casimir forces between defects in one-dimensional Fermi liquids:

influence of resonant tunneling

Authors: J.N. Fuchs, A. Recati, and W. Zwerger

Comments: This paper is a continuation of the work published in Phys. Rev. A

72, 023616 (2005)

Subj-class: Mesoscopic Systems and Quantum Hall Effect

\\

We study the interaction of two localized impurities in a repulsive

one-dimensional Fermi liquid via bosonization. At distances much larger than

the interparticle spacing, they interact through a Casimir-type force mediated

by the zero sound phonons of the underlying quantum liquid. The strength and

even the sign of the interaction depends sensitively on the impurity separation

due to resonant tunneling through the double barrier structure.

\\ ( http://arXiv.org/abs/cond-mat/0610659 , 20kb)

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Paper: cond-mat/0610675

Date: Tue, 24 Oct 2006 18:30:36 GMT (244kb)

Title: Exact treatment of trapped imbalanced fermions in the BEC limit

Authors: P. Pieri, G.C. Strinati

Comments: 18 pages, 10 figures, Proceedings of the International School of

Physics "Enrico Fermi" -- Course CLXIV "Ultra-Cold Fermi Gases", Varenna,

June 2006

Subj-class: Superconductivity; Other

\\

We analyze the effects of imbalancing the populations of two-component

trapped fermions in the BEC (strong-coupling) limit of the attractive

interaction between fermions of different components. In particular, we derive

a set of coupled equations which describe composite bosons and excess fermions

in this limit, starting from the gap equation with two different fermionic

chemical potentials. Care is used to include in these equations the processes

leading to the correct dimer-dimer and dimer-fermion scattering lengths, which

require us to consider beyond-mean-field effects. Numerical results are

presented for the density profiles of composite bosons and excess fermions.

Results for the formation of vortex patterns in the presence of density

imbalance are also presented.

\\ ( http://arXiv.org/abs/cond-mat/0610675 , 244kb)

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Paper: physics/0610207

Date: Tue, 24 Oct 2006 09:39:35 GMT (242kb)

Title: Negative Energy Resonances of Bosons in a Magnetic Quadrupole Trap

Authors: Shahpoor Saeidian, Igor Lesanovsky, Peter Schmelcher

Comments: 8 figures

Subj-class: Atomic Physics

\\

We investigate resonances of spin 1 bosons in a three-dimensional magnetic

quadrupole field. Complementary to the well-known positive energy resonances it

is shown that there exist short-lived, i.e. broad, negative energy resonances.

The latter are characterized by an atomic spin that is aligned antiparallel to

the local magnetic field direction. In contrast to the positive energy

resonances the lifetimes of the negative energy resonances decreases with

increasing total magnetic quantum number. We derive a mapping of the two

branches of the spectrum.

\\ ( http://arXiv.org/abs/physics/0610207 , 242kb)

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Paper: physics/0610210

Date: Tue, 24 Oct 2006 10:32:19 GMT (19kb)

Title: Feshbach resonances in the presence of inelastic scattering: threshold

behavior and suppression of poles in scattering lengths

Authors: Jeremy M. Hutson

Comments: 4 pages, 1 figure

Subj-class: Atomic Physics; Chemical Physics

\\

In the absence of inelastic scattering, Feshbach resonances produce poles in

scattering lengths and very large peaks in elastic cross sections. However,

inelastic scattering removes the poles. Even for quite weak inelastic

scattering the peaks in cross sections are dramatically suppressed. A resonant

scattering length is defined to characterize the strength of the resonance, and

is shown to be small for most collisions of ultracold molecules. The results

suggest that cross sections for ultracold molecular inelastic collisions are

much less sensitive to details of the potential than has been believed.

\\ ( http://arXiv.org/abs/physics/0610210 , 19kb)

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Paper: physics/0610214

Date: Tue, 24 Oct 2006 12:15:06 GMT (92kb)

Title: Ultracold atom-molecule collisions and bound states in magnetic fields:

tuning zero-energy Feshbach resonances in He-NH (3Sigma-)

Authors: Maykel Leonardo Gonzalez-Martinez and Jeremy M. Hutson

Comments: 14 pages, 13 figures

Subj-class: Atomic Physics; Atomic and Molecular Clusters; Chemical Physics

\\

We have generalized the BOUND and MOLSCAT packages to allow calculations in

basis sets where the monomer Hamiltonians are off-diagonal and used the new

capability to carry out bound-state and scattering calculations on 3He-NH and

4He-NH as a function of magnetic field. Following the bound-state energies to

the point where they cross thresholds gives very precise predictions of the

magnetic fields at which zero-energy Feshbach resonances occur. We have used

this to locate and characterize two very narrow Feshbach resonances in 3He-NH.

Such resonances can be used to tune elastic and inelastic collision cross

sections, and sweeping the magnetic field across them will allow a form of

quantum control in which separated atoms and molecules are associated to form

complexes. For the first resonance, where only elastic scattering is possible,

the scattering length shows a pole as a function of magnetic field and there is

a very large peak in the elastic cross section. For the second resonance,

however, inelastic scattering is also possible. In this case the pole in the

scattering length is dramatically suppressed and the cross sections show

relatively small peaks. The peak suppression is expected to be even larger in

systems with stronger inelasticity. The results suggest that calculations on

ultracold molecular inelastic collisions may be much less sensitive to details

of the potential energy surface than has been believed.

\\ ( http://arXiv.org/abs/physics/0610214 , 92kb)

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Paper: physics/0610219

Date: Tue, 24 Oct 2006 16:08:31 GMT (230kb)

Title: Molecular collisions in ultracold atomic gases

Authors: Jeremy M. Hutson and Pavel Soldan

Comments: Review article accepted for publication in International Reviews in

Physical Chemistry. To be published in Vol. 26, issue 1 (January 2007)

Subj-class: Atomic Physics; Chemical Physics

\\

It has recently become possible to form molecules in ultracold gases of

trapped alkali metal atoms. Once formed, the molecules may undergo elastic,

inelastic and reactive collisions. Inelastic and reactive collisions are

particularly important because they release kinetic energy and eject atoms and

molecules from the trap. The theory needed to handle such collisions is

presented and recent quantum dynamics calculations on ultracold atom-diatom

collisions of spin-polarised Li + Li_2, Na + Na_2 and K + K_2 are described.

All these systems have potential energy surfaces on which barrierless atom

exchange reactions can occur, and both inelastic and reactive rates are very

fast (typically k(inel) > 10^{-10} cm^3 s^-1 in the Wigner regime).

\\ ( http://arXiv.org/abs/physics/0610219 , 230kb)

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Paper: cond-mat/0610702

Date: Wed, 25 Oct 2006 17:17:38 GMT (16kb)

Title: Vortex lattices in Bose-Einstein condensates with Dipolar Interactions

Beyond the Weak Interaction Limit

Authors: S. Komineas, N.R. Cooper

Comments: 5 pages, 1 figure

Subj-class: Mesoscopic Systems and Quantum Hall Effect

\\

We study the ground states of rotating atomic Bose-Einstein condensates with

dipolar interactions. We present the results of numerical studies on a periodic

geometry which show vortex lattice ground states of various symmetries:

triangular and square vortex lattices, "stripe crystal" and "bubble crystal".

We present the phase diagram (for systems with a large number of vortices) as a

function of the ratio of dipolar to contact interactions and of the chemical

potential. We discuss the experimental requirements for observing transitions

between vortex lattice groundstates via dipolar interactions. We finally

investigate the stability of mean-field supersolid phases of a quasi-2D

non-rotating Bose gas with dipolar interactions.

\\ ( http://arXiv.org/abs/cond-mat/0610702 , 16kb)

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Paper: cond-mat/0610703

Date: Wed, 25 Oct 2006 17:37:46 GMT (185kb)

Title: Scattering of two-dimensional solitons in dipolar Bose-Einstein

condensates

Authors: R. Nath, P. Pedri and L. Santos

Comments: 4 pages, 5 eps figures

Subj-class: Other

\\

We analyze the scattering of bright solitons in dipolar Bose-Einstein

condensates placed in unconnected layers. Whereas for short-range interactions

unconnected layers are independent, a remarkable consequence of the dipole

interaction is the appearance of novel nonlocal interlayer effects. In

particular, we show that the interlayer interaction leads to an effective

molecular potential between disconnected solitons, inducing a complex

scattering physics between them, which includes inelastic fusion into

soliton-molecules, and strong symmetric and asymmetric inelastic resonances. In

addition, a fundamentally new 2D scattering scenario in matter-wave solitons is

possible, in which inelastic spiraling occurs, resembling phenomena in

photorrefractive materials. Finally, we consider the scattering of unconnected

1D solitons and discuss the feasibility in current on going experiments.

\\ ( http://arXiv.org/abs/cond-mat/0610703 , 185kb)

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Paper: physics/0610231

Date: Wed, 25 Oct 2006 19:10:17 GMT (968kb)

Title: Mismatch management for optical and matter-wave quadratic solitons

Authors: R. Driben, Y. Oz, B. A. Malomed, A. Gubeskys, and V. A. Yurovsky (Tel

Aviv University)

Comments: 11 pages, 6 figures

Subj-class: Optics; Atomic Physics

\\

We propose a way to control solitons in $\chi ^{(2)}$

(quadratically-nonlinear) systems by means of periodic modulation imposed on

the phase-mismatch parameter ("mismatch management", MM). It may be realized in

the co-transmission of fundamental-frequency (FF) and second-harmonic (SH)

waves in a planar optical waveguide via a long-period modulation of the usual

quasi-phase-matching pattern of ferroelectric domains. The MM may also be

implemented by dint of the Feshbach resonance in a harmonically-modulated

magnetic field in a hybrid atomic-molecular Bose-Einstein condensate (BEC),

with the atomic and molecular mean fields (MFs) playing the roles of the FF and

SH, respectively. The problem is analyzed by two methods. First, we identify

stability regions for spatial solitons in the MM system, in terms of the MM

amplitude and period, using the MF equations for spatially-inhomogeneous

configurations. In particular, an instability enclave is found inside the

stability area.The robustness of the solitons is also tested against variation

of the shape of the input pulse, and a threshold for the formation of stable

solitons is found in terms of its power. Interactions between solitons are

virtually unaffected by the MM. The second method (\textit{parametric

approximation}), going beyond the MF description, is developed for

spatially-homogeneous states. It demonstrates that the MF description is valid

for large modulation periods, while at smaller periods the non-MF component

acquires gain, which implies destruction of MF under the action of the

high-frequency MM.

\\ ( http://arXiv.org/abs/physics/0610231 , 968kb)

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Paper: cond-mat/0610727

Date: Thu, 26 Oct 2006 06:42:55 GMT (326kb)

Title: Coupled Breathing Oscillations of Two-Component Fermion Condensates in

Deformed Traps

Authors: Tomoyuki Maruyama andTakushi Nishimura

Comments: 18 pages and 8 figures

Subj-class: Other

\\

We investigate collective excitations coupled with monopole and quadrupole

oscillations in two-component fermion condensates in deformed traps. The

frequencies of monopole and dipole modes are calculated using Thomas-Fermi

theory and the scaling approximation. When the trap is largely deformed, these

collective motions are decoupled to the transverse and longitudinal breathing

oscillation modes. As the trap approaches becoming spherical, however, they are

coupled and show complicated behaviors.

\\ ( http://arXiv.org/abs/cond-mat/0610727 , 326kb)

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Paper: cond-mat/0610740

Date: Thu, 26 Oct 2006 14:33:20 GMT (2141kb)

Title: Asymmetric matter-wave solitons at nonlinear interfaces

Authors: Fangwei Ye, Yaroslav V. Kartashov, Lluis Torner

Comments: 18 pages, 6 figures, to appear in Physical Review A

Subj-class: Materials Science

\\

We predict the existence and study the basic properties of strongly

asymmetric matter wave solitons that form at the interface produced by regions

with different inter-atomic interaction strengths in pancake Bose-Einstein

condensates. We address several types of surface solitons featuring

topologically complex structures, including vortex and dipole-mode solitons. We

found that the soliton become significantly asymmetric for high number of

particles in the condensate. Yet, we reveal that under suitable conditions,

that we elucidate, even such strongly asymmetric dipole and vortex solitons can

be dynamically stable over wide regions of their existence domains.

\\ ( http://arXiv.org/abs/cond-mat/0610740 , 2141kb)

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Paper: quant-ph/0610223

Date: Thu, 26 Oct 2006 10:02:34 GMT (40kb)

Title: Two-photon and EIT-assisted Doppler cooling in a three-level cascade

system

Authors: Giovanna Morigi, Ennio Arimondo

Comments: 5 pages, 3 figures

\\

Laser cooling processes are theoretically investigated for a cascade scheme

of atomic levels where the upper state decays more slowly than the intermediate

one. A laser coupling to the upper transition modifies the scattering cross

section, such that its action results in temperatures lower than those reached

by Doppler cooling on the lower levels. We identify two regimes: when

multiphoton processes due to the upper laser are relevant, the formation of an

atomic coherence between ground and upper state affects the cooling dynamics,

and the final temperature is controlled by the second laser parameters. When

the intermediate state is only virtually excited, the dynamics are dominated by

the two-photon process and the final temperature is determined by the

spontaneous decay rate of the upper state.

\\ ( http://arXiv.org/abs/quant-ph/0610223 , 40kb)

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Paper: quant-ph/0610225

Date: Thu, 26 Oct 2006 14:05:50 GMT (45kb)

Title: Geometric phase of an atom in a magnetic storage ring

Authors: P. Zhang and L. You

Comments: 7pages, 4 figures

\\

A magnetically trapped atom experiences an adiabatic geometric (Berry's)

phase due to changing field direction. We investigate theoretically such an

Aharonov-Bohm-like geometric phase for atoms adiabatically moving inside a

storage ring as demonstrated in several recent experiments. Our result shows

that this phase shift is easily observable in a closed loop interference

experiment, and thus the shift has to be accounted for in the proposed inertial

sensing applications. The spread in phase shift due to the atom transverse

distribution is quantified through numerical simulations.

\\ ( http://arXiv.org/abs/quant-ph/0610225 , 45kb)

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Paper: cond-mat/0408460

replaced with revised version Thu, 19 Oct 2006 21:23:59 GMT (103kb)

Title: Vortices and Ring Solitons in Bose-Einstein Condensates

Authors: L. D. Carr and Charles W. Clark

Comments: 15 pages, 9 figures -- final version

Subj-class: Other; Pattern Formation and Solitons

Journal-ref: Phys. Rev. A v. 74, 043613 (2006).

http://link.aps.org/abstract/PRA/v74/e043613

\\ ( http://arXiv.org/abs/cond-mat/0408460 , 103kb)

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Paper: physics/0609203

replaced with revised version Thu, 19 Oct 2006 23:40:29 GMT (250kb)

Title: Exploring the phase space of the quantum delta kicked accelerator

Authors: G. Behinaein, V. Ramareddy, P. Ahmadi, and G.S. Summy

Comments: 4 pages, 5 figures, added 2 references and figures are modified to

increase the readability, submitted to Phys. Rev. Lett

Subj-class: Atomic Physics

\\ ( http://arXiv.org/abs/physics/0609203 , 250kb)

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Paper: cond-mat/0508054

replaced with revised version Mon, 23 Oct 2006 10:22:30 GMT (25kb)

Title: Energy absorption of a Bose gas in a periodically modulated optical

lattice

Authors: A. Iucci, M. A. Cazalilla, A. Ho and T. Giamarchi

Comments: 4 pages, 3 figures. Added references, typos corrected. High

dimensional case revised, figures changed

Subj-class: Mesoscopic Systems and Quantum Hall Effect

Journal-ref: Phys. Rev. A 73, 041608(R) (2006)

\\ ( http://arXiv.org/abs/cond-mat/0508054 , 25kb)

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Paper: cond-mat/0605121

replaced with revised version Mon, 23 Oct 2006 14:40:57 GMT (15kb)

Title: Sweeping from the superfluid to Mott phase in the Bose-Hubbard model

Authors: Ralf Sch\"utzhold, Michael Uhlmann, Yan Xu, Uwe R. Fischer

Comments: 4 pages of RevTex4, 1 figure; to appear in Physical Review Letters

Subj-class: Statistical Mechanics

\\ ( http://arXiv.org/abs/cond-mat/0605121 , 15kb)

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Paper: quant-ph/0605095

replaced with revised version Mon, 23 Oct 2006 17:25:38 GMT (511kb)

Title: Quantum teleportation between light and matter

Authors: Jacob Sherson, Hanna Krauter, Rasmus K. Olsson, Brian Julsgaard,

Klemens Hammerer, Ignacio Cirac and Eugene S. Polzik

Comments: 23 pages, 8 figures, incl. supplementary information

Journal-ref: Nature 443, 557-560 (5 October 2006)

\\ ( http://arXiv.org/abs/quant-ph/0605095 , 511kb)

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Paper: quant-ph/0607171

replaced with revised version Fri, 20 Oct 2006 21:35:35 GMT (524kb)

Title: Quantized Rotation of Atoms From Photons with Orbital Angular Momentum

Authors: M. F. Andersen, C. Ryu, Pierre Clade, V. Natarajan, A. Vaziri, K.

Helmerson, W. D. Phillips

Comments: New version, 4 pages and 3 figures, accepted for publication in

Physical Review Letters

\\ ( http://arXiv.org/abs/quant-ph/0607171 , 524kb)

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Paper: cond-mat/0608566

replaced with revised version Tue, 24 Oct 2006 15:42:38 GMT (379kb)

Title: Excitations from a Bose-Einstein condensate of magnons in coupled spin

ladders

Authors: V. O. Garlea, A. Zheludev, T. Masuda, H. Manaka, J.-H. Chung, Y. Qiu,

K. Habicht, K. Kiefer

Comments: 4 pages, 4 figures

Subj-class: Strongly Correlated Electrons; Superconductivity

\\ ( http://arXiv.org/abs/cond-mat/0608566 , 379kb)

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Paper: cond-mat/0610579

replaced with revised version Tue, 24 Oct 2006 17:35:57 GMT (210kb)

Title: Numerical study of one-dimensional and interacting Bose-Einstein

condensates in a random potential

Authors: Eric Akkermans (Technion), Sankalpa Ghosh (I. I. T Delhi), Ziad

Musslimani (Florida State university)

Comments: 13 pages, 13 figures, few typos corrected

Subj-class: Other; Disordered Systems and Neural Networks

\\ ( http://arXiv.org/abs/cond-mat/0610579 , 210kb)

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Paper: cond-mat/0602037

replaced with revised version Tue, 24 Oct 2006 20:27:18 GMT (190kb)

Title: Validity of the Lowest Landau Level Approximation for Rotating Bose

Gases

Authors: Alexis G. Morris and David L. Feder

Comments: Ver. 3: Updated acknowledgements, minor corrections. 8 pages, 9

figures

Subj-class: Mesoscopic Systems and Quantum Hall Effect

Journal-ref: Phys. Rev. A 74, 033605 (2006)

DOI: 10.1103/PhysRevA.74.033605

\\ ( http://arXiv.org/abs/cond-mat/0602037 , 190kb)

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Paper: cond-mat/0606815

replaced with revised version Wed, 25 Oct 2006 19:47:31 GMT (268kb)

Title: Localized modes in arrays of boson-fermion mixtures

Authors: Yu. V. Bludov, V. V. Konotop

Subj-class: Other; Pattern Formation and Solitons

Journal-ref: PHYSICAL REVIEW A 74, 043616 (2006)

DOI: 10.1103/PhysRevA.74.043616

\\ ( http://arXiv.org/abs/cond-mat/0606815 , 268kb)

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Paper: quant-ph/0605245

replaced with revised version Wed, 25 Oct 2006 14:07:57 GMT (67kb)

Title: Manipulation of Single Neutral Atoms in Optical Lattices

Authors: Chuanwei Zhang, S. L. Rolston, and S. Das Sarma

Comments: 5 pages, 3 figures

Subj-class: Quantum Physics; Soft Condensed Matter

Journal-ref: Phys. Rev. A. 74, 042316 (2006)

\\ ( http://arXiv.org/abs/quant-ph/0605245 , 67kb)

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Paper: quant-ph/0605245

replaced with revised version Wed, 25 Oct 2006 14:07:57 GMT (67kb)

Title: Manipulation of Single Neutral Atoms in Optical Lattices

Authors: Chuanwei Zhang, S. L. Rolston, and S. Das Sarma

Comments: 5 pages, 3 figures

Subj-class: Quantum Physics; Soft Condensed Matter

Journal-ref: Phys. Rev. A. 74, 042316 (2006)

\\ ( http://arXiv.org/abs/quant-ph/0605245 , 67kb)

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Paper: quant-ph/0610022

replaced with revised version Tue, 24 Oct 2006 22:53:54 GMT (224kb)

Title: Demonstration of a Tunable-Bandwidth White Light Interferometer using

Anomalous Dispersion in Atomic Vapor

Authors: G.S. Pati, M. Salit, K. Salit, and M.S. Shahriar

Comments: 18 Pages, 6 figures

\\ ( http://arXiv.org/abs/quant-ph/0610022 , 224kb)

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Paper: cond-mat/0604416

replaced with revised version Thu, 26 Oct 2006 09:56:10 GMT (402kb)

Title: Thermal Fluctuations of Vortex Matter in Trapped Bose-Einstein

Condensates

Authors: S. Kragset, E. Babaev and A. Sudbo

Comments: v2: figure quality improved; v3: references added, minor extentions

following referee requests

Subj-class: Statistical Mechanics

Journal-ref: Phys. Rev. Lett. 97, 170403 (2006)

DOI: 10.1103/PhysRevLett.97.170403

\\ ( http://arXiv.org/abs/cond-mat/0604416 , 402kb)

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Paper: cond-mat/0610476

replaced with revised version Thu, 26 Oct 2006 17:34:20 GMT (207kb)

Title: Mean-field phase diagram of cold lattice bosons in disordered potentials

Authors: P. Buonsante, V. Penna, A. Vezzani and P.B. Blakie

Comments: 5 pages, 4 figures, added some references and reformulated some

sentences

Subj-class: Soft Condensed Matter; Statistical Mechanics

\\ ( http://arXiv.org/abs/cond-mat/0610476 , 207kb)

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Paper (*cross-listing*): nlin.SI/0605006

replaced with revised version Thu, 26 Oct 2006 19:55:09 GMT (20kb)

Title: Nonlinear Dynamics of Quantum Systems and Soliton Theory

Authors: Eldad Bettelheim, Alexander G. Abanov, Paul Wiegmann

Comments: Some corrections made

Subj-class: Exactly Solvable and Integrable Systems; Other

\\ ( http://arXiv.org/abs/nlin/0605006 , 20kb)

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Last week follows,

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 Mon Nov 06 2006 - 17:42:40 EST

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