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

Date: Mon, 8 Nov 2010 14:56:10 +1000

Date: Mon, 8 Nov 2010 14:56:10 +1000

Dear subscribers,

This week's selection was compiled by Simon Haine, and contains 34 new

abstracts and 12 replacements.

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arXiv:0902.3980 (*cross-listing*)

Date: Mon, 23 Feb 2009 19:58:19 GMT (42kb,D)

Date (revised v2): Wed, 6 Oct 2010 20:18:10 GMT (42kb,D)

Title: Causality in Condensates: Grey Solitons as Remnants of BEC Formation

Authors: Wojciech H. Zurek

Categories: cond-mat.stat-mech hep-ph quant-ph

Comments: Typos in Eq. (3), (13), and (25) fixed

Journal-ref: Phys. Rev. Lett. 102, 105702 (2009)

DOI: 10.1103/PhysRevLett.102.105702

\\

Symmetry breaking during phase transitions can lead to the formation of

topological defects (such as vortex lines in superfluids). However, the usually

studied BEC's have the shape of a cigar, a geometry that impedes vortex

formation, survival, and detection. I show that, in elongated traps, one can

expect the formation of "grey solitons" (long-lived, non-topological "phase

defects") as a result of the same mechanism. Their number will rise

approximately in proportion to the transition rate. This steep rise is due to

the increasing size of the region of the BEC cigar where the phase of the

condensate wavefunction is chosen locally (rather than passed on from the

already formed BEC).

\\ ( http://arxiv.org/abs/0902.3980 , 42kb)

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arXiv:1007.4260 (*cross-listing*)

Date: Sat, 24 Jul 2010 09:31:59 GMT (66kb)

Date (revised v2): Mon, 4 Oct 2010 15:22:21 GMT (66kb)

Title: The itinerant ferromagnetic phase of the Hubbard model

Authors: Giuseppe Carleo, Saverio Moroni, Federico Becca and Stefano Baroni

Categories: cond-mat.str-el cond-mat.other physics.comp-ph

\\

Using a newly developed quantum Monte Carlo technique, we provide strong

evidence for the stability of a saturated ferromagnetic phase in the

high-density regime of the two-dimensional infinite-U Hubbard model. By

decreasing the electron density, a discontinuous transition to a paramagnetic

phase is observed, accompanied by a divergence of the susceptibility on the

paramagnetic side. This behavior, resulting from a high degeneracy among

different spin sectors, is consistent with an infinite-order phase transition.

The remarkable stability of itinerant ferromagnetism renews the hope to

describe this phenomenon within a purely kinetic mechanism and will facilitate

the validation of experimental quantum simulators with cold atoms loaded in

optical lattices.

\\ ( http://arxiv.org/abs/1007.4260 , 66kb)

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arXiv:1010.0016

Date: Thu, 30 Sep 2010 20:39:44 GMT (145kb)

Title: Nonlinear Landau-Zener tunneling in quantum phase space

Authors: F. Trimborn, D. Witthaut, V. Kegel, and H. J. Korsch

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

Comments: 26 pages, 12 figures

Journal-ref: New J. Phys. 12, 053010 (2010)

DOI: 10.1088/1367-2630/12/5/053010

\\

We present a detailed analysis of the Landau-Zener problem for an interacting

Bose-Einstein condensate in a time-varying double-well trap, especially

focussing on the relation between the full many-particle problem and the

mean-field approximation. Due to the nonlinear self-interaction a dynamical

instability occurs, which leads to a breakdown of adiabaticity condition and

thus fundamentally alters the dynamics. It is shown that essentially all

features of the Landau-Zener problem including the depletion of the condensate

mode can be already understood within a semiclassical phase space picture. In

particular, this treatment resolves the formerly imputed incommutability of the

adiabatic and semiclassical limits. The possibility to exploit Landau-Zener

sweeps to generate squeezed states for spectroscopic tasks is analysed in

detail. Moreover, we study the influence of phase noise and propose a

Landau-Zener sweep as a sensitive, yet readily implementable probe for

decoherence, since this has a significant effect on the transition rate for

slow parameter variations.

\\ ( http://arxiv.org/abs/1010.0016 , 145kb)

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arXiv:1010.0037

Date: Thu, 30 Sep 2010 23:37:35 GMT (174kb)

Title: Photon-photon gates in Bose-Einstein condensates

Authors: Arnaud Rispe, Bing He, Christoph Simon

Categories: quant-ph

Comments: 4 pages, 3 figures

\\

It has recently been shown that light can be stored in Bose-Einstein

condensates for over a second. Here we propose a method for realizing a

controlled phase gate between two stored photons. The photons are both stored

in the ground state of the effective trapping potential inside the condensate.

The collision-induced interaction is enhanced by adiabatically increasing the

trapping frequency and by using a Feshbach resonance. A controlled phase shift

of $\pi$ can be achieved in one second.

\\ ( http://arxiv.org/abs/1010.0037 , 174kb)

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arXiv:1010.0044

Date: Fri, 1 Oct 2010 01:18:04 GMT (30kb)

Title: T-matrix approach for few-body problems in ultracold atomic gases

Authors: Xiaoling Cui

Categories: cond-mat.quant-gas

Comments: 4 pages, 1 figure

\\

We propose a systematic T-matrix approach to solve two-body and few-body

problems in a dilute cold atomic gas. In most general cases, the problem is

reduced to a matrix equation expanded by various orthogonal molecular states

describing external center-of-mass motions of a pair of interacting particles;

while each matrix element is guaranteed to be finite by properly renormalizing

the short-range contributions for internal relative motions. We apply this

method to study three two-species fermions with different mass ratios in a

(rotating) harmonic trap, where distinct scattering properties tuned by the

mass ratio are analyzed and the transitions between different total angular

momenta are identified, which can shed light on quantum Hall physics in this

system.

\\ ( http://arxiv.org/abs/1010.0044 , 30kb)

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arXiv:1010.0101

Date: Fri, 1 Oct 2010 09:44:46 GMT (589kb,D)

Title: Efficient Guiding of Cold Atoms though a Photonic Band Gap Fiber

Authors: S. Vorrath, S. A. M\"oller, P. Windpassinger, K. Bongs and K.

Sengstock

Categories: quant-ph physics.atom-ph

Comments: 8 pages, 3 figures

\\

We demonstrate the first guiding of cold atoms through a 88 mm long piece of

photonic band gap fiber. The guiding potential is created by a far-off

resonance dipole trap propagating inside the fiber with a hollow core of 12 mu

m. We load the fiber from a dark spot 85-Rb magneto optical trap and observe a

peak flux of more than 10^5 atoms/s at a velocity of 1.5 m/s. With an

additional reservoir optical dipole trap, a constant atomic flux of 1.5 10^4

atoms/s is sustained for more than 150\,ms. These results open up interesting

possibilities to study nonlinear light-matter interaction in a nearly

one-dimensional geometry and pave the way for guided matter wave

interferometry.

\\ ( http://arxiv.org/abs/1010.0101 , 589kb)

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arXiv:1010.0109

Date: Fri, 1 Oct 2010 10:02:56 GMT (602kb)

Title: Spin Squeezing, Negative Correlations, and Concurrence in the Quantum

Kicked Top Model

Authors: Xiaoqian Wang, Jian Ma, Lijun Song, Xihe Zhang, Xiaoguang Wang

Categories: quant-ph

Comments: 8 pages, 6 figures

\\

We study spin squeezing, negative correlations, and concurrence in the

quantum kicked top model. We prove that the spin squeezing and negative

correlations are equivalent for spin systems with only symmetric Dicke states

populated. We numerically analyze spin squeezing parameters and concurrence in

this model, and find that the maximal spin squeezing direction, which refers to

the minimal pairwise correlation direction, is strongly influenced by quantum

chaos. Entanglement (spin squeezing) sudden death and sudden birth occur

alternatively for the periodic and quasi-periodic cases, while only

entanglement (spin squeezing) sudden death is found for the chaotic case.

\\ ( http://arxiv.org/abs/1010.0109 , 602kb)

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arXiv:1010.0114

Date: Fri, 1 Oct 2010 10:13:59 GMT (273kb,D)

Title: Loss-induced phase separation and pairing for 3-species atomic lattice

fermions

Authors: A. Privitera, I. Titvinidze, S.-Y. Chang, S. Diehl, A. J. Daley and W.

Hofstetter

Categories: cond-mat.quant-gas

Comments: 5 pages, 3 figures

\\

We study the physics of a three-component Fermi gas in an optical lattice, in

the presence of a strong three-body constraint arising due to three-body loss.

Using analytical and numerical techniques, we show that an atomic color

superfluid phase is formed in this system and undergoes phase separation

between unpaired fermions and superfluid pairs. This phase separation survives

well above the critical temperature, giving a clear experimental signature of

the three-body constraint.

\\ ( http://arxiv.org/abs/1010.0114 , 273kb)

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arXiv:1010.0116

Date: Fri, 1 Oct 2010 10:24:32 GMT (5048kb,D)

Title: Energy cascade with small-scales thermalization, counterflow

metastability and anomalous velocity of vortex rings in Fourier-truncated

Gross-Pitaevskii equation

Authors: Giorgio Krstulovic and Marc Brachet

Categories: cond-mat.stat-mech

\\

The statistical equilibria of the dynamics of the Gross-Pitaevskii Equation

(GPE) with a finite range of spatial Fourier modes are characterized using a

new algorithm, based on a stochastically forced Ginzburg-Landau equation

(SGLE), that directly generates grand canonical distributions.. The

SGLE-generated distributions are validated against finite-temperature

GPE-thermalized states and exact low-temperature results. A standard

second-order $\lambda$-transition is exhibited. A new mechanism of GPE

thermalization through a direct cascade of energy is found using initial

conditions with mass and energy distributed at large scales. A long transient

with partial thermalization at small-scales is observed. Vortices are shown to

disappear as a prelude to final thermalization and their annihilation is

related to the contraction of vortex rings due to mutual friction. Increasing

the amount of dispersion at truncation wavenumber is shown to slowdown

thermalization and vortex annihilation. A bottleneck that produces spontaneous

effective self truncation with partial thermalization is characterized in the

limit of large dispersive effects. Metastable counter-flow states are generated

using the SGLE algorithm. Spontaneous nucleation of vortex ring is observed and

the corresponding Arrhenius law is characterized. Dynamical counter-flow

effects on vortex evolution are investigated. Longitudinal effects are produced

and measured. A dilatation of vortex rings is obtained for larger counterflows.

The vortex ring longitudinal velocity has a strong dependence on temperature,

an effect that is related to the presence of finite-amplitude Kelvin waves.

This anomalous vortex ring velocity is quantitatively reproduced by assuming

equipartition of energy of the Kelvin waves. Orders of magnitude are given for

the predicted effects in weakly interacting Bose-Einstein condensates and

superfluid $^4{\rm He}$.

\\ ( http://arxiv.org/abs/1010.0116 , 5048kb)

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arXiv:1010.0165

Date: Fri, 1 Oct 2010 13:53:24 GMT (373kb)

Title: How to observe dipolar effects in spinor Bose-Einstein condensates

Authors: Krzysztof Gawryluk, Kai Bongs, and Miroslaw Brewczyk

Categories: cond-mat.quant-gas

Comments: 4 pages, 3 figures

\\

We study a spinor condensate of alkali atoms in F = 1 hyperfine state under

the presence of an oscillating magnetic field. We find resonances which, due to

the dipolar interactions, magnify the transfer of atoms from mF = 1 to mF = 0

Zeeman sublevel. These resonances occur at magnetic fields of the order of

milligaus and are broad enough to enable observation of the famous Einstein-de

Haas effect, which is solely a dipolar effect, in systems of cold alkali gases.

\\ ( http://arxiv.org/abs/1010.0165 , 373kb)

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arXiv:1010.0198 (*cross-listing*)

Date: Fri, 1 Oct 2010 16:25:38 GMT (1888kb)

Title: Cooling in strongly correlated optical lattices: prospects and

challenges

Authors: D. McKay and B. DeMarco

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

Comments: in review with Reports on Progress in Physics

\\

Optical lattices have emerged as ideal simulators for Hubbard models of

strongly correlated materials, such as the high-temperature superconducting

cuprates. In optical lattice experiments, microscopic parameters such as the

interaction strength between particles are well known and easily tunable.

Unfortunately, this benefit of using optical lattices to study Hubbard models

come with one clear disadvantage: the energy scales in atomic systems are

typically nanoKelvin compared with Kelvin in solids, with a correspondingly

miniscule temperature scale required to observe exotic phases such as d-wave

superconductivity. The ultra-low temperatures necessary to reach the regime in

which optical lattice simulation can have an impact-the domain in which our

theoretical understanding fails-have been a barrier to progress in this field.

To move forward, a concerted effort to develop new techniques for cooling and,

by extension, techniques to measure even lower temperatures. This article will

be devoted to discussing the concepts of cooling and thermometry, fundamental

sources of heat in optical lattice experiments, and a review of proposed and

implemented thermometry and cooling techniques.

\\ ( http://arxiv.org/abs/1010.0198 , 1888kb)

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arXiv:1010.0293 (*cross-listing*)

Date: Sat, 2 Oct 2010 06:06:03 GMT (79kb)

Title: The scattering amplitude of ultracold atoms near the p-wave magnetic

Feshbach Resonance

Authors: Peng Zhang, Pascal Naidon and Masahito Ueda

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

Comments: 13 pages, 3 figs

\\

Most of the current theories on the p-wave superfluid in cold atomic gases

are based on the effective-range theory for the two-body scattering, where the

low energy p-wave scattering amplitude $f_1(k)$ is given by $%

f_1(k)=-1/[ik+1/(\mathcal{V}k^2)+1/\mathcal{R}]$, where $k$ is the incident

momentum, and $\mathcal{V}$ and $\mathcal{R}$ are the $k$-independent

scattering volume and effective-range, respectively. However, due to the

long-range nature of the van der Waals interaction between two colliding

ultracold atoms, the p-wave scattering amplitude of the two atoms is not

described by the effective-range theory. In this paper we provide an explicit

calculation for the p-wave scattering of two ultracold atoms near the p-wave

magnetic Feshbach resonance (PMFR). We show that the low energy p-wave

scattering amplitude in the presence of PMFR takes the form

$f_1(k)=-1/[ik+1/(\mathcal{V}^{\mathrm{eff}}k^2)+1/(\mathcal{S}^{\mathrm{eff}%}k)+1/\mathcal{R}^{\mathrm{eff}}]$

where $\mathcal{V}^{\mathrm{eff}},$ $% \mathcal{S}^{\mathrm{eff}}$ and

$\mathcal{R}^{\mathrm{eff}}$ are $k$% -dependent parameters. Based on this

result, we show sufficient conditions for the effective range theory to be a

good approximation of the exact scattering amplitude. Using these conditions we

show that the effective-range theory is a good approximation for the p-wave

scattering in the ultracold gases of $^{6}$Li and $^{40}$K when the scattering

volume is enhanced by the resonance.

\\ ( http://arxiv.org/abs/1010.0293 , 79kb)

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arXiv:1010.0391 (*cross-listing*)

Date: Sun, 3 Oct 2010 10:41:32 GMT (152kb,D)

Title: Dynamics of ring dark solitons in Bose-Einstein condensates and

nonlinear optics

Authors: A.M. Kamchatnov and S.V. Korneev

Categories: nlin.PS cond-mat.quant-gas

Comments: 10 pages, 4 figures

Journal-ref: Physics Letters A 374 (2010), pp. 4625-4628

DOI: 10.1016/j.physleta.2010.09.019

\\

Quasiparticle approach to dynamics of dark solitons is applied to the case of

ring solitons. It is shown that the energy conservation law provides the

effective equations of motion of ring dark solitons for general form of the

nonlinear term in the generalized nonlinear Schroedinger or Gross-Pitaevskii

equation. Analytical theory is illustrated by examples of dynamics of ring

solitons in light beams propagating through a photorefractive medium and in

non-uniform condensates confined in axially symmetric traps. Analytical results

agree very well with the results of our numerical simulations.

\\ ( http://arxiv.org/abs/1010.0391 , 152kb)

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arXiv:1010.0465

Date: Mon, 4 Oct 2010 03:01:58 GMT (67kb,D)

Title: p-Wave Optical Feshbach Resonances in Yb-171

Authors: Krittika Goyal, Iris Reichenbach and Ivan Deutsch

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

Comments: 8 pages, 4 figures

\\

We study the use of an optical Feshbach resonance to modify the p-wave

interaction between ultracold polarized Yb-171 spin-1/2 fermions. A laser

exciting two colliding atoms to the 1S_0 + 3P_1 channel can be detuned near a

purely-long-range excited molecular bound state. Such an exotic molecule has an

inner turning point far from the chemical binding region and thus

three-body-recombination in the Feshbach resonance will be highly suppressed in

contrast to that typically seen in a ground state p-wave magnetic Feshbach

resonance. We calculate the excited molecular bound-state spectrum using a

multichannel integration of the Schr\"{o}dinger equation, including an external

perturbation by a magnetic field. From the multichannel wave functions, we

calculate the Feshbach resonance properties, including the modification of the

elastic p-wave scattering volume and inelastic spontaneous scattering rate. The

use of magnetic fields and selection rules for polarized light yields a highly

controllable system. We apply this control to propose a toy model for

three-color superfluidity in an optical lattice for spin-polarized Yb-171,

where the three colors correspond to the three spatial orbitals of the first

excited p-band. We calculate the conditions under which tunneling and on-site

interactions are comparable, at which point quantum critical behavior is

possible.

\\ ( http://arxiv.org/abs/1010.0465 , 67kb)

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arXiv:1010.0527

Date: Mon, 4 Oct 2010 10:17:29 GMT (248kb)

Title: Inelastic scattering of atoms in a double well

Authors: E. S. Annibale, O. Fialko and K. Ziegler

Categories: cond-mat.quant-gas

Comments: 12 pages, 9 figures

\\

We study a mixture of two light spin-1/2 fermionic atoms and two heavy atoms

%in a Mott state in a double well potential. Inelastic scattering processes

between both atomic species excite the heavy atoms and renormalize the

tunneling rate and the interaction of the light atoms (polaron effect). The

effective interaction of the light atoms changes its sign and becomes

attractive for strong inelastic scattering. This is accompanied by a crossing

of the energy levels from singly occupied sites at weak inelastic scattering to

a doubly occupied and an empty site for stronger inelastic scattering. We are

able to identify the polaron effect and the level crossing in the quantum

dynamics.

\\ ( http://arxiv.org/abs/1010.0527 , 248kb)

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arXiv:1010.0666

Date: Mon, 4 Oct 2010 19:38:23 GMT (93kb)

Title: Dimensional reduction of a binary Bose-Einstein condensate in mixed

dimensions

Authors: L. E. Young S., L. Salasnich, S. K. Adhikari

Categories: cond-mat.quant-gas

\\

We present effective reduced equations for the study of a binary

Bose-Einstein condensate (BEC), where the confining potentials of the two BEC

components have distinct asymmetry so that the components belong to different

space dimensions as in a recent experiment [G. Lamporesi et al., Phys. Rev.

Lett. 104, 153202 (2010)]. Starting from a binary three-dimensional (3D)

Gross-Pitaevskii equation (GPE) and using a Lagrangian variational approach we

derive a binary effective nonlinear Schroedinger equation with components in

different reduced dimensions, e. g., the first component in one dimension and

the second in two dimensions as appropriate to represent a cigar-shaped BEC

coupled to a disk-shaped BEC. We demonstrate that the effective reduced binary

equation, which depend on the geometry of the system, is quite reliable when

compared with the binary 3D GPE and can be efficiently used to perform

numerical simulation and analytical calculation for the investigation of static

and dynamic properties of a binary BEC in mixed dimensions.

\\ ( http://arxiv.org/abs/1010.0666 , 93kb)

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arXiv:1010.0726 (*cross-listing*)

Date: Mon, 4 Oct 2010 23:01:05 GMT (1568kb,D)

Title: An effective theory of pulse propagation in a nonlinear and disordered

medium in two dimensions

Authors: G. Schwiete and A. M. Finkelstein

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

Comments: 15 pages, 11 figures. Prepared for "Perspectives of Mesoscopic

Physics - Dedicated to Prof Yoseph Imry's 70th Birthday". This article is

based on arXiv:0905.4722 [PRL 104, 103904 (2010)] and contains additional

information and illustrations

\\

We develop an effective theory of pulse propagation in a nonlinear {\it and}

disordered medium. The theory is formulated in terms of a nonlinear diffusion

equation. Despite its apparent simplicity this equation describes novel

phenomena which we refer to as "locked explosion" and "diffusive" collapse. The

equation can be applied to such distinct physical systems as laser beams

propagating in disordered photonic crystals or Bose-Einstein condensates

expanding in a disordered environment.

\\ ( http://arxiv.org/abs/1010.0726 , 1568kb)

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arXiv:1010.0734

Date: Tue, 5 Oct 2010 00:02:57 GMT (121kb)

Title: Photoionization Rates of Cs Rydberg Atoms in a 1064 nm Far Off-Resonance

Trap

Authors: J. Tallant and D. Booth and J. P. Shaffer

Categories: physics.atom-ph

Comments: 12 pages, 4 figures

\\

Experimental measurements of photoionization rates of $nD_{5/2}$ Rydberg

states of Cs ($50 \leq n \leq 75$) in a 1064 nm far off-resonance dipole trap

are presented. The photoionization rates are obtained by measuring the

lifetimes of Rydberg atoms produced inside of a 1064 nm far off-resonance trap

and comparing the lifetimes to corresponding control experiments in a

magneto-optical trap. Experimental results for the control experiments agree

with recent theoretical predictions for Rydberg state lifetimes and measured

photoionization rates are in agreement with transition rates calculated from a

model potential.

\\ ( http://arxiv.org/abs/1010.0734 , 121kb)

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arXiv:1010.0806

Date: Tue, 5 Oct 2010 09:11:14 GMT (673kb)

Title: Equilibrium and off-equilibrium trap-size scaling in 1D ultracold

bosonic gases

Authors: Massimo Campostrini and Ettore Vicari

Categories: cond-mat.quant-gas cond-mat.stat-mech

Comments: 24 pages, 36 figs

\\

We study some aspects of equilibrium and off equilibrium quantum dynamics of

dilute bosonic gases in the presence of a trapping potential. We consider

systems with a fixed number of particles N and study their scaling behavior

with increasing the trap size. We focus on one-dimensional (1D) bosonic

systems, such as gases described by the Lieb-Liniger model and its

Tonks-Girardeau limit of impenetrable bosons, and gases constrained in optical

lattices as described by the Bose-Hubbard model. We study their quantum

(zero-temperature) behavior at equilibrium and off equilibrium during the

unitary time evolution arising from changes of the trapping potential, which

may be instantaneous or described by a power-law time dependence, starting from

the equilibrium ground state for a initial trap size. Renormalization-group

scaling arguments, analytical and numerical calculations show that the

trap-size dependence of the equilibrium and off-equilibrium dynamics can be

cast in the form of a trap-size scaling in the low-density regime,

characterized by universal power laws of the trap size, in dilute gases with

repulsive contact interactions and lattice systems described by the

Bose-Hubbard model. The scaling functions corresponding to several physically

interesting observables are computed. Our results are of experimental relevance

for systems of cold atomic gases trapped by tunable confining potentials.

\\ ( http://arxiv.org/abs/1010.0806 , 673kb)

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arXiv:1010.0853

Date: Tue, 5 Oct 2010 12:09:48 GMT (144kb)

Title: Correlation function of weakly interacting bosons in a disordered

lattice

Authors: B. Deissler, E. Lucioni, M. Modugno, G. Roati, L. Tanzi, M. Zaccanti,

M. Inguscio, G. Modugno

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

Comments: 16 pages, 8 figures

\\

One of the most important issues in disordered systems is the interplay of

the disorder and repulsive interactions. Several recent experimental advances

on this topic have been made with ultracold atoms, in particular the

observation of Anderson localization, and the realization of the disordered

Bose-Hubbard model. There are however still questions as to how to

differentiate the complex insulating phases resulting from this interplay, and

how to measure the size of the superfluid fragments that these phases entail.

It has been suggested that the correlation function of such a system can give

new insights, but so far little experimental investigation has been performed.

Here, we show the first experimental analysis of the correlation function for a

weakly interacting, bosonic system in a quasiperiodic lattice. We observe an

increase in the correlation length as well as a change in shape of the

correlation function in the delocalization crossover from Anderson glass to

coherent, extended state. In between, the experiment indicates the formation of

progressively larger coherent fragments, consistent with a fragmented BEC, or

Bose glass.

\\ ( http://arxiv.org/abs/1010.0853 , 144kb)

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arXiv:1010.1075

Date: Wed, 6 Oct 2010 07:13:22 GMT (2608kb)

Title: Ferromagnetic Resonance in Spinor Dipolar Bose--Einstein Condensates

Authors: Masashi Yasunaga and Makoto Tsubota

Categories: cond-mat.quant-gas

Comments: 8 pages, 10 figures

\\

We used the Gross--Pitaevskii equations to investigate ferromagnetic

resonance in spin-1 Bose--Einstein condensates with a magnetic dipole-dipole

interaction. By introducing the dipole interaction, we obtained equations

similar to the Kittel equations used to represent ferromagnetic resonance in

condensed matter physics. These equations indicated that the ferromagnetic

resonance originated from dipolar interaction, and that the resonance frequency

depended upon the shape of the condensate. Furthermore, spin currents driven by

spin diffusions are characteristic of this system.

\\ ( http://arxiv.org/abs/1010.1075 , 2608kb)

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arXiv:1010.1122 (*cross-listing*)

Date: Wed, 6 Oct 2010 11:08:05 GMT (5212kb)

Title: Non-degenerate four-wave mixing in rubidium vapor: transient regime

Authors: F. E. Becerra, R. T. Willis, S. L. Rolston, H. J. Carmichael, and L.

A. Orozco

Categories: physics.optics physics.atom-ph quant-ph

Comments: 11 pages, 11 figures, to be published in Physical Review A

\\

We investigate the transient response of the generated light from Four-Wave

Mixing (FWM) in the diamond configuration using a step-down field excitation.

The transients show fast decay times and oscillations that depend on the

detunings and intensities of the fields. A simplified model taking into account

the thermal motion of the atoms, propagation, absorption and dispersion effects

shows qualitative agreement with the experimental observations with the energy

levels in rubidium (5S1/2, 5P1/2, 5P3/2 and 6S1/2). The atomic polarization

comes from all the contributions of different velocity classes of atoms in the

ensemble modifying dramatically the total transient behavior of the light from

FWM.

\\ ( http://arxiv.org/abs/1010.1122 , 5212kb)

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arXiv:1010.1162 (*cross-listing*)

Date: Wed, 6 Oct 2010 14:16:57 GMT (2038kb,D)

Title: The Accelerating Universe

Authors: Dragan Huterer (University of Michigan)

Categories: astro-ph.CO physics.pop-ph

Comments: Invited review chapter for book aimed at general scientists (ed. D.

Goodstein); 25 pages, 10 figures

\\

In this article we review the discovery of the accelerating universe using

type Ia supernovae. We then outline ways in which dark energy - component that

causes the acceleration - is phenomenologically described. We finally describe

principal cosmological techniques to measure large-scale properties of dark

energy. This chapter complements other articles in this book that describe

theoretical understanding (or lack thereof) of the cause for the accelerating

universe.

\\ ( http://arxiv.org/abs/1010.1162 , 2038kb)

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arXiv:1010.1190

Date: Wed, 6 Oct 2010 16:25:58 GMT (29kb)

Title: Bell's Theory with no Locality assumption

Authors: Charles Tresser

Categories: quant-ph

Report-no: 12 pages, 0 figures

Journal-ref: Eur. Phys. J. D 58, 385-396 (2010)

DOI: 10.1140/epjd/e2010-00122-8

\\

We prove versions of the Bell and the GHZ Theorems that do not assume

Locality but only the Effect After Cause Principle (EACP) according to which

for any Lorentz observer the value of an observable cannot change because of an

event that happens after the observable is measured. We show that the EACP is

strictly weaker than Locality. As a consequence of our results, Locality cannot

be considered as the common cause of the contradictions obtained in all

versions of Bell's Theory. All versions of Bell's Theorem assume Weak Realism

according to which the value of an observable is well defined whenever the

measurement could be made and some measurement is made. As a consequence of our

results, Weak Realism becomes the only hypothesis common to the contradictions

obtained in all versions of Bell's Theory. Usually, one avoids these

contradictions by assuming Non-Locality; this would not help in our case since

we do not assume Locality. This work indicates that it is Weak Realism, not

Locality, that needs to be negated to avoid contradictions in microscopic

physics, at least if one refuses as false the de Broglie-Bohm Hidden Variable

theory because of its essential violation of Lorentz invariance.

\\ ( http://arxiv.org/abs/1010.1190 , 29kb)

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\\

arXiv:1010.1196

Date: Wed, 6 Oct 2010 16:38:05 GMT (26kb)

Title: Bell's Theory with no Locality assumption: putting Free Will at work

Authors: Charles Tresser

Categories: quant-ph

Comments: 13 pages, 0 figures: Conference in honor of Pierre Coullet's 60th

Birthday; Vina del Mar, Chile, December 2009. This paper completes the

original Bell Theorem part of Charles Tresser:"Bell's theory with no locality

assumption", Eur.Phys.J. D 58, 385-396 (2010); (DOI: 10.1140/ep

jd/e2010-00122-8)

\\

We prove a version of the Bell's Theorem that does not assume Locality but

only the Effect After Cause Principle (EACP) according to which for any Lorentz

observer the value of an observable cannot change because of an event that

happens after the observable is measured. Since the EACP is compatible both

with Locality and with Non-Locality, Locality cannot be considered as the

common cause of the contradictions obtained in all versions of Bell's Theory.

By definition, all versions of Bell's Theorem assume Weak Realism according to

which the value of an observable needed in the discussion of Bell's Theorem is

well defined whenever the measurement could be made and some measurement is

made. As a consequence of our results, Weak Realism becomes the only hypothesis

common to the contradictions obtained in all versions of Bell's Theory. This

work indicates that it is Weak Realism, not Locality, that needs to be negated

to avoid the contradictions in microscopic Physics associated to Bell's Theory,

at least if one refuses as false the de Broglie-Bohm Hidden Variable theory

because of its essential violation of Lorentz invariance. This paper completes

with much more details the genuine Bell Theorem part of a previous paper. That

paper also offered a treatment of the GHZ entanglement, a treatment which did

not suffer from the lack of clarity of the definition of the EACP.

\\ ( http://arxiv.org/abs/1010.1196 , 26kb)

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\\

arXiv:1010.1200

Date: Wed, 6 Oct 2010 16:42:14 GMT (54kb)

Title: Bethe-Salpeter equations for the collective-mode spectrum of a

superfluid Fermi gas in a moving optical lattice

Authors: Zlatko Koinov

Categories: cond-mat.str-el

\\

We derive the Bethe-Salpeter (BS) equations for the collective-mode spectrum

of superfluid Fermi gases of equal mixture of atomic Fermi gas of two hyperfine

states loaded into a moving optical lattice. In a moving lattice the superfluid

state is unstable due to spontaneous emission of the short-wavelength rotonlike

excitations which appear in the spectrum of the collective modes. It is shown

that the spectrum obtained by the BS equations is in an excellent agreement

with the collective-mode dispersion calculated by the perturbation approach,

while there are some differences between the results obtained by density

response function method and by the BS approach. The difference increases with

increasing the lattice velocity, which can be seen in the analytical

approximations for the dispersion relation in the long-wavelength limit in a

weak-coupling regime.

\\ ( http://arxiv.org/abs/1010.1200 , 54kb)

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\\

arXiv:1010.1208

Date: Wed, 6 Oct 2010 17:19:50 GMT (236kb,D)

Title: Direct probing of non-classical single-photon wavepacket

Authors: Kaisa Laiho, Katiuscia N. Cassemiro, David Gross, and Christine

Silberhorn

Categories: quant-ph

Comments: 4 pages, 4 figures

\\

We investigate quantum properties of pulsed light fields point-by-point in

phase space. We probe the negative region of the Wigner function of a single

photon state generated by means of waveguided parametric down-conversion. This

capability is achieved by employing loss-tolerant photon number resolving

detection, allowing to directly observe the oscillations of the photon number

statistics in dependence of applied displacements in phase space. Our scheme is

highly mode sensitive and can reveal the single-mode character of the signal

state.

\\ ( http://arxiv.org/abs/1010.1208 , 236kb)

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\\

arXiv:1010.1228

Date: Wed, 6 Oct 2010 18:49:22 GMT (256kb)

Title: Stimulated Raman adiabatic passage into continuum

Authors: A. A. Rangelov, N. V. Vitanov, and E. Arimondo

Categories: quant-ph

Journal-ref: Phys. Rev. A 76, 043414 (2007)

DOI: 10.1103/PhysRevA.76.043414

\\

We propose a technique which produces nearly complete ionization of the

population of a discrete state coupled to a continuum by a two-photon

transition via a lossy intermediate state whose lifetime is much shorter than

the interaction duration. We show that using counterintuitively ordered pulses,

as in stimulated Raman adiabatic passage (STIRAP), wherein the pulse coupling

the intermediate state to the continuum precedes and partly overlaps the pulse

coupling the initial and intermediate states, greatly increases the ionization

signal and strongly reduces the population loss due to spontaneous emission

through the lossy state. For strong spontaneous emission from that state,

however, the ionization is never complete because the dark state required for

STIRAP does not exist. We demonstrate that this drawback can be eliminated

almost completely by creating a laser-induced continuum structure (LICS) by

embedding a third discrete state into the continuum with a third control laser.

This LICS introduces some coherence into the continuum, which enables a

STIRAP-like population transfer into the continuum. A highly accurate analytic

description is developed and numerical results are presented for Gaussian pulse

shapes.

\\ ( http://arxiv.org/abs/1010.1228 , 256kb)

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\\

arXiv:1010.1280

Date: Wed, 6 Oct 2010 21:08:57 GMT (146kb)

Title: Counterintuitive transitions between crossing energy levels

Authors: A. A. Rangelov, J. Piilo, and N. V. Vitanov

Categories: quant-ph

Journal-ref: Phys. Rev. A 72, 053404 (2005)

DOI: 10.1103/PhysRevA.72.053404

\\

We calculate analytically the probabilities for intuitive and

counterintuitive transitions in a three-state system, in which two parallel

energies are crossed by a third, tilted energy. The state with the tilted

energy is coupled to the other two states in a chainwise linkage pattern with

constant couplings of finite duration. The probability for a counterintuitive

transition is found to increase with the square of the coupling and decrease

with the squares of the interaction duration, the energy splitting between the

parallel energies, and the tilt (chirp) rate. Physical examples of this model

can be found in coherent atomic excitation and optical shielding in cold atomic

collisions.

\\ ( http://arxiv.org/abs/1010.1280 , 146kb)

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\\

arXiv:1010.1301

Date: Wed, 6 Oct 2010 23:31:34 GMT (75kb)

Title: Quantum Criticality of 1D Attractive Fermi Gas

Authors: Xiwen Guan and Tin-Lun Ho

Categories: cond-mat.quant-gas

Comments: 4+2 pages, 5 eps figures, Fig. 5 was improved

\\

We obtain analytical equation of state for one-dimensional strongly

attractive Fermi gas for all parameter regime in current experiments. The

critical properties of the system are described by that of free fermions and

that mixtures of fermions with mass $m$ and $2m$. We also show how these

critical properties of bulk systems can be revealed from the density profile of

trapped Fermi gas and can be used to determine the T=0 phase boundary.

\\ ( http://arxiv.org/abs/1010.1301 , 75kb)

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\\

arXiv:1010.1382

Date: Thu, 7 Oct 2010 10:02:57 GMT (237kb)

Title: The self-consistent microscopic model of an energy spectrum of a

superfluity $^{4}$He with the Hermitian form of Bogoliubov-Zubarev

Hamiltonian

Authors: K.V. Grigorishin and B.I. Lev

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

\\

Based on the collective variables representation with the Hermitian form of

Bogoliubov-Zubarev Hamiltonian the self-consistent oscillator model of a ground

state and excited states of Bose liquid has been proposed. The new method of

calculation of anharmonic terms in this Hamiltonian and its interpretation have

been presented. The dispersion equation for a collective excitation in a

superfluid $^{4}$He has been obtained in self-consistent way, where real and

virtual processes of decay of a collective excitation were considered. The end

point, determined by a threshold of collective excitation's decay on two

rotons, of the dispersion curve has been obtained and it was shown that the

dispersion curve strongly depends on property of its stability. An approach

with a structure factor has been realized without using of any adaption

parameters. Based on the oscillator model the new method of self-consistent

calculation of a ground state energy and density of Bose condensate has been

proposed. The model of suppression of Bose condensate has been presented.

\\ ( http://arxiv.org/abs/1010.1382 , 237kb)

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\\

arXiv:1010.1431 (*cross-listing*)

Date: Thu, 7 Oct 2010 13:39:47 GMT (17kb)

Title: Density and Temperature of Fermions from Quantum Fluctuations

Authors: Hua Zheng and Aldo Bonasera

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

\\

A novel method to determine the density and temperature of a system is

proposed based on quantum fluctuations typical of Fermions in the limit where

the reached temperature T is small compared to the Fermi energy $\epsilon_f$ at

a given density $\rho$. Quadrupole and particle multiplicity fluctuations

relations are derived in terms of $\frac{T}{\epsilon_f}$. This method is valid

for infinite and finite fermionic systems, in particular we apply it to heavy

ion collisions using the Constrained Molecular Dynamics (CoMD) approach which

includes the Fermi statistics. A preliminary comparison to available

experimental data is discussed as well. We stress the differences with methods

based on classical approximations. The derived 'quantum' temperatures are

systematically lower than the corresponding 'classical' ones. With the proposed

method we may get important informations on the Equation of State (EOS) of

quantum Fermi systems to order O($\frac{T}{\epsilon_f})^3$, in particular near

the Liquid-Gas (LG) phase transition and at very low densities where quantum

effects are dominant.

\\ ( http://arxiv.org/abs/1010.1431 , 17kb)

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\\

arXiv:1010.1501

Date: Thu, 7 Oct 2010 18:07:41 GMT (75kb)

Title: Coherent Radiation by a Spherical Medium of Resonant Atoms

Authors: Sudhakar Prasad and Roy J. Glauber

Categories: physics.optics

Report-no: PraGla05

\\

Radiation by the atoms of a resonant medium is a cooperative process in which

the medium participates as a whole. In two previous papers \cite{PG00,GP00}, we

treated this problem for the case of a medium having slab geometry, which,

under plane wave excitation, supports coherent waves that propagate in one

dimension. We extend the treatment here to the three-dimensional problem,

focusing principally on the case of spherical geometry. By regarding the

radiation field as a superposition of electric and magnetic multipole fields of

different orders, we express it in terms of suitably defined scalar fields. The

latter fields possess a sequence of exponentially decaying eigenmodes

corresponding to each multipole order. We consider several examples of

spherically symmetric initial excitations of a sphere. Small uniformly excited

spheres, we find, tend to radiate superradiantly, while the radiation from a

large sphere with an initially excited inner core exhibits temporal

oscillations that result from the participation of a large number of coherently

excited amplitudes in different modes. The frequency spectrum of the emitted

radiation possesses a rich structure, including a frequency gap for large

spheres and sharply defined and closely spaced peaks caused by the small

frequency shifts and even smaller decay rates characteristic of the majority of

eigenmodes.

\\ ( http://arxiv.org/abs/1010.1501 , 75kb)

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\\

arXiv:1010.1520

Date: Thu, 7 Oct 2010 19:25:58 GMT (1077kb,D)

Title: Differential Light Shift Cancellation in a Magnetic-Field-Insensitive

Transition of $^{87}$Rb

Authors: R. Chicireanu and K. D. Nelson and S. Olmschenk and N. Lundblad and A.

Derevianko and J. V. Porto

Categories: quant-ph physics.atom-ph

Comments: 5 pages, 4 figures

\\

We demonstrate near-complete cancellation of the differential light shift of

a two-photon magnetic-field-insensitive microwave hyperfine (clock) transition

in $^{87}$Rb atoms trapped in an optical lattice. Up to $95(2)%$ of the

differential light shift is canceled while maintaining magnetic-field

insensitivity. This technique should have applications in quantum information

and frequency metrology.

\\ ( http://arxiv.org/abs/1010.1520 , 1077kb)

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The replacements:

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\\

arXiv:0907.1584

replaced with revised version Fri, 1 Oct 2010 02:05:01 GMT (328kb)

Title: Three-vortex configurations in trapped Bose-Einstein condensates

Authors: J. A. Seman, E. A. L. Henn, M. Haque, R. F. Shiozaki, E. R. F. Ramos,

M. Caracanhas, C. Castelo Branco, P. E. S. Tavares, F. J. Poveda-Cuevas, G.

Roati, K. M. F. Magalh\~aes and V. S. Bagnato

Categories: cond-mat.quant-gas

Comments: 4 pages, 4 figures

Journal-ref: Published in Physical Review A 82, 033616 (2010)

DOI: 10.1103/PhysRevA.82.033616

\\ ( http://arxiv.org/abs/0907.1584 , 328kb)

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\\

arXiv:1007.4441 (*cross-listing*)

replaced with revised version Fri, 1 Oct 2010 09:38:35 GMT (5072kb,D)

Title: Dispersive bottleneck delaying thermalization of turbulent Bose-Einstein

Condensates

Authors: Giorgio Krstulovic and Marc Brachet

Categories: physics.flu-dyn cond-mat.quant-gas

\\ ( http://arxiv.org/abs/1007.4441 , 5072kb)

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\\

arXiv:0905.1146

replaced with revised version Fri, 1 Oct 2010 16:24:21 GMT (520kb)

Title: $F$-wave pairing of cold atoms in optical lattices

Authors: Wei-Cheng Lee, Congjun Wu, S. Das Sarma

Categories: cond-mat.quant-gas cond-mat.supr-con

Comments: 9 pages, 5 figures

\\ ( http://arxiv.org/abs/0905.1146 , 520kb)

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\\

arXiv:1003.3096 (*cross-listing*)

replaced with revised version Fri, 1 Oct 2010 19:33:00 GMT (33kb)

Title: Fermi-Bose Mixtures Near Broad Interspecies Feshbach Resonances

Authors: Jun Liang Song, Mohammad S. Mashayekhi and Fei Zhou

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

Comments: 5 pages, 4 figures

\\ ( http://arxiv.org/abs/1003.3096 , 33kb)

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\\

arXiv:1006.5540

replaced with revised version Sat, 2 Oct 2010 00:56:12 GMT (218kb)

Title: Dynamic Structure Factor of Normal Fermi Gas from Collisionless to

Hydrodynamic Regime

Authors: Shohei Watabe, and Tetsuro Nikuni

Categories: cond-mat.quant-gas

Comments: 19 pages, 9 figures

Journal-ref: Phys. Rev. A 82, 033622 (2010)

DOI: 10.1103/PhysRevA.82.033622

\\ ( http://arxiv.org/abs/1006.5540 , 218kb)

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\\

arXiv:0912.2263

replaced with revised version Sat, 2 Oct 2010 23:43:29 GMT (21kb)

Title: Stability of the superfluid state in a disordered 1D ultracold fermionic

gas

Authors: Masaki Tezuka and Antonio M. Garcia-Garcia

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

Comments: 5 pages, 5 figures

\\ ( http://arxiv.org/abs/0912.2263 , 21kb)

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\\

arXiv:1009.1671

replaced with revised version Tue, 5 Oct 2010 00:56:45 GMT (1280kb)

Title: Hydrodynamic equation of a spinor dipolar Bose-Einstein condensate

Authors: Kazue Kudo and Yuki Kawaguchi

Categories: cond-mat.quant-gas

Comments: 13 pages, 5 figures

\\ ( http://arxiv.org/abs/1009.1671 , 1280kb)

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\\

arXiv:1005.4024

replaced with revised version Tue, 5 Oct 2010 13:28:25 GMT (5390kb)

Title: Black hole lasers in Bose-Einstein condensates

Authors: Stefano Finazzi and Renaud Parentani

Categories: cond-mat.quant-gas gr-qc

Comments: iopams, 37 pages, 14 figures, 1 table; for associated gif animations,

see http://people.sissa.it/~finazzi/bec_bhlasers/movies/ or

http://iopscience.iop.org/1367-2630/12/9/095015/media. Published on New. J.

Phys. (http://iopscience.iop.org/1367-2630/12/9/095015/). V2: few new

comments, modified figures

Journal-ref: New J. Phys. 12 (2010) 095015

DOI: 10.1088/1367-2630/12/9/095015

\\ ( http://arxiv.org/abs/1005.4024 , 5390kb)

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\\

arXiv:1006.4674 (*cross-listing*)

replaced with revised version Tue, 5 Oct 2010 16:00:19 GMT (412kb,D)

Title: Spin gradient demagnetization cooling of ultracold atoms

Authors: Patrick Medley, David M. Weld, Hirokazu Miyake, David E. Pritchard,

and Wolfgang Ketterle

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

Comments: 10 pages, 4 figures; (v3) Added discussion, used updated values of

scattering lengths

\\ ( http://arxiv.org/abs/1006.4674 , 412kb)

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\\

arXiv:1005.2645

replaced with revised version Tue, 5 Oct 2010 19:09:14 GMT (91kb)

Title: Time-resolved density correlations as probe of squeezing in toroidal

Bose-Einstein condensates

Authors: Michael Uhlmann

Categories: cond-mat.quant-gas

Comments: 18 pages, IOP style

Journal-ref: New J. Phys. 12 095016 (2010)

DOI: 10.1088/1367-2630/12/9/095016

\\ ( http://arxiv.org/abs/1005.2645 , 91kb)

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\\

arXiv:physics/0210040

replaced with revised version Wed, 6 Oct 2010 03:29:10 GMT (271kb)

Title: Linking inverse square law with quantum mechanical probabilities

Authors: Shantilal G. Goradia

Categories: physics.gen-ph

\\ ( http://arxiv.org/abs/physics/0210040 , 271kb)

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\\

arXiv:1005.4213

replaced with revised version Wed, 6 Oct 2010 19:32:53 GMT (320kb)

Title: Cold matter trapping via rotating helical optical potential

Authors: A.Yu.Okulov

Categories: physics.atom-ph cond-mat.quant-gas nlin.PS physics.optics

Comments: 13 pages, 3 figures, submitted to referred journal

\\ ( http://arxiv.org/abs/1005.4213 , 320kb)

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Till next time,

Matt.

-- ========================================================================= Dr M. J. Davis, Associate Professor in Physics School of Mathematics and Physics, ph : +61 7 334 69824 The University of Queensland, fax : +61 7 336 51242 Brisbane, QLD 4072, mdavis_at_physics.uq.edu.au Australia. www.physics.uq.edu.au/people/mdavis/ ========================================================================= Matt's arXiv selection: weekly summary of cold-atom papers from arXiv.org http://www.physics.uq.edu.au/people/mdavis/matts_arXiv/ ========================================================================= Legal stuff: Unless stated otherwise, this e-mail represents only the views of the sender and not the views of the University of Queensland ========================================================================= _______________________________________________ Matts-arxiv mailing list Matts-arxiv_at_lists.sps.uq.edu.auReceived on Thu Nov 11 2010 - 17:36:56 EST

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