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

Date: Tue, 18 Dec 2007 23:01:54 +1000

Date: Tue, 18 Dec 2007 23:01:54 +1000

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

Hi all,

This week there were 25 preprints and 7 replacements:

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arXiv:0711.2598

Date: Fri, 16 Nov 2007 12:50:48 GMT (439kb)

Title: Magnetic trapping of a cold Rb-Cs atomic mixture

Authors: M L Harris, P Tierney, S L Cornish

Categories: cond-mat.other

Comments: 16 pages, 5 figures

\\

We present an apparatus for the study of an ultracold gaseous atomic mixture

of 133Cs and 87Rb. The mixture is prepared using a double magneto-optical trap

(MOT) system in which a two-species pyramid MOT acts as a source of cold atoms

for a `science' MOT. Measurements of the interspecies trap loss rate

coefficients beta_RbCs and beta_CsRb in the science MOT are reported. After the

initial MOT phase, atoms in the mixture are optically pumped into the

magnetically trappable |F=3,m_F=-3> and |F=1,m_F=-1> states of Cs and Rb

(respectively) and loaded into an Ioffe-Pritchard magnetic trap. We demonstrate

a novel technique for limiting the interspecies loss rate in the science MOT by

spatially separating the two trapped atom clouds, which greatly enhances the

number of atoms which can be loaded into the magnetic trap.

\\ ( http://arxiv.org/abs/0711.2598 , 439kb)

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arXiv:0711.2436 (*cross-listing*)

Date: Thu, 15 Nov 2007 15:19:37 GMT (707kb)

Title: Nonlinear Dynamics in Double Square Well Potential

Authors: Ramaz Khomeriki, Jerome Leon, Stefano Ruffo, Sandro Wimberger

Categories: nlin.PS cond-mat.other math-ph math.MP physics.atom-ph

Journal-ref: Theor. Math. Phys., v. 152, p.1122 (2007)

\\

Considering the coherent nonlinear dynamics in double square well potential

we find the example of coexistence of Josephson oscillations with a

self-trapping regime. This macroscopic bistability is explained by proving

analytically the simultaneous existence of symmetric, antisymmetric and

asymmetric stationary solutions of the associated Gross-Pitaevskii equation.

The effect is illustrated and confirmed by numerical simulations. This property

allows to make suggestions on possible experiments using Bose-Einstein

condensates in engineered optical lattices or weakly coupled optical waveguide

arrays.

\\ ( http://arxiv.org/abs/0711.2436 , 707kb)

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arXiv:0711.2662

Date: Fri, 16 Nov 2007 18:33:38 GMT (104kb)

Title: Electromagnetically induced transparency at high optical power

Authors: S. M. Iftiquar

Categories: physics.optics physics.atom-ph

Comments: 3 pages, five figures

\\

We observe electromagnetically induced transparency (EIT) in Rb vapor at

various optical intensities, starting from below saturation to several times

the saturation intensity. The observed Lorentzian width of the EIT signal is

very small. Solving the time dependant density matrix equation of motion with a

phenomenological decay constant, we find an expression suitable in explaining

the EIT signal. In this experimental observation and theoretical analysis

intensity of EIT signal and its Lorentzian width increases with Rabi frequency

of optical field.

\\ ( http://arxiv.org/abs/0711.2662 , 104kb)

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arXiv:0711.2663

Date: Fri, 16 Nov 2007 18:39:32 GMT (84kb)

Title: Wide range and highly sensitive atomic magnetometry with Rb vapor

Authors: S. M. Iftiquar

Categories: physics.optics physics.atom-ph

Comments: 3 pages, 4 figures

\\

We have developed a technique in which Rb atomic response to weak magnetic

field is high and an efficient rotation of linearly polarized laser beam

results in efficient magnetometry. 85Rb isotope has been used for the

magnetometry in an ordinary vapor cell without any paraffin coating to its

inner wall. A linear regime of Faraday rotation of about 25 microT has been

observed with atomic number density within the vapor cell of about 109 cm-3.

\\ ( http://arxiv.org/abs/0711.2663 , 84kb)

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arXiv:0711.2697

Date: Fri, 16 Nov 2007 22:54:39 GMT (177kb)

Title: Exact edge singularities in dynamic correlation functions of 1D Bose gas

Authors: Adilet Imambekov and Leonid I. Glazman

Categories: cond-mat.str-el

\\

The spectral function and dynamic structure factor of bosons interacting by

contact repulsion and confined to one dimension (1D) exhibit power-law

singularities along the dispersion curves of the collective modes. We find the

corresponding exponents exactly, by relating them to the known Bethe Ansatz

solution of the Lieb-Liniger model. The found exponents vary considerably with

the interaction strength and momentum. Remarkably, the Luttinger liquid theory

predictions for the exponents fail even at low energies, once the immediate

vicinities of the edges are considered.

\\ ( http://arxiv.org/abs/0711.2697 , 177kb)

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arXiv:0711.2778

Date: Mon, 19 Nov 2007 16:12:34 GMT (560kb)

Title: Formation and dynamics of many-boson fragmented states in attractive

one-dimensional ultra-cold gases

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

Categories: cond-mat.other

Comments: 11 pages, 3 figures

\\

Dynamics of attractive ultra-cold bosonic clouds in one dimension are studied

by solving the many-particle time-dependent Schr\"odinger equation. The

initially coherent wave-packet can dynamically dissociate into two parts when

its energy exceeds a threshold value. Noticeably, the time-dependent

Gross-Pitaevskii theory applied to the same initial state does not show up the

splitting. We call the split object {\it fragmenton}. It possesses remarkable

properties: (1) it is two-fold fragmented, i.e., not coherent; (2) it is

dynamically stable, i.e., it propagates almost without dispersion; (3) it is

delocalized, i.e., the two dissociated parts still communicate with one

another. A simple static model predicts the existence of fragmented states

which are responsible for formation and dynamics of fragmentons.

\\ ( http://arxiv.org/abs/0711.2778 , 560kb)

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arXiv:0711.2891

Date: Mon, 19 Nov 2007 10:29:29 GMT (164kb)

Title: Asymmetric Fermi Superfluid With Two Types Of Pairings

Authors: Xuguang Huang, Xuewen Hao and Pengfei Zhuang

Categories: cond-mat.supr-con cond-mat.mes-hall

Comments: 6 pages, 1 figure. Proceedings of Poster Session, Quark Matter 2006,

November 14-20, 2006, Shanghai, P.R.China

Journal-ref: Int. J. Mod. Phys. E 16, (2007) 2307

\\

We investigate the phase diagram in the plane of temperature and chemical

potential mismatch for an asymmetric fermion superfluid with double- and

single-species pairings. There is no mixing of these two types of pairings at

fixed chemical potential, but the introduction of the single species pairing

cures the magnetic instability at low temperature.

\\ ( http://arxiv.org/abs/0711.2891 , 164kb)

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arXiv:0711.2916

Date: Mon, 19 Nov 2007 20:34:12 GMT (784kb,D)

Title: Exploring an ultracold Fermi-Fermi mixture: Interspecies Feshbach

resonances and scattering properties of 6Li and 40K

Authors: E. Wille, F.M. Spiegelhalder, G. Kerner, D. Naik, A. Trenkwalder, G.

Hendl, F. Schreck, R. Grimm, T.G. Tiecke, J.T.M. Walraven, S.J.J.M.F.

Kokkelmans, E. Tiesinga, P.S. Julienne

Categories: cond-mat.other

Comments: 4 pages, 4 figures, 1 table

\\

We report on the observation of Feshbach resonances in an ultracold mixture

of two fermionic species, 6Li and 40K. The experimental data are interpreted

using a simple asymptotic bound state model and full coupled channels

calculations. This unambiguously assigns the observed resonances in terms of

various s- and p-wave molecular states and fully characterizes the ground-state

scattering properties in any combination of spin states.

\\ ( http://arxiv.org/abs/0711.2916 , 784kb)

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arXiv:0711.2963

Date: Mon, 19 Nov 2007 15:49:31 GMT (856kb)

Title: Renormalization Group Theory for the Imbalanced Fermi Gas

Authors: K. B. Gubbels and H. T. C. Stoof

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

Comments: 4 pages, 2 figures

\\

We develop a wilsonian renormalization group theory for the imbalanced Fermi

gas. The theory is able to recover quantitatively well-established results in

both the weak-coupling and the strong-coupling (unitarity) limit. We determine

for the latter case the line of second-order phase transitions of the

imbalanced Fermi gas and in particular the location of the tricritical point.

We obtain good agreement with the recent experiments of Y. Shin {\it et al}.

arXiv:0709.3027 [cond-mat].

\\ ( http://arxiv.org/abs/0711.2963 , 856kb)

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arXiv:0711.2975

Date: Mon, 19 Nov 2007 18:13:31 GMT (37kb)

Title: Self-Trapping of Bosons and Fermions in Optical Lattices

Authors: Dirk-S\"oren L\"uhmann, Kai Bongs, Klaus Sengstock, Daniela Pfannkuche

Categories: cond-mat.other

Comments: 4 pages, 4 figures

\\

We numerically investigate the enhanced localisation of bosonic 87Rb by

fermionic 40K atoms in three-dimensional optical lattices and find a

self-trapping of bosons and fermions. Due to the mutual interaction the fermion

orbitals are substantially squeezed which results in a strong deformation of

the bosonic effective potential. This effect is enhanced by an increasing

bosonic filling factor leading to a large shift of the phase transition between

the superfluid and the Mott-insulator. We find a non-linear dependency of the

critical point on the interaction strength and show the important role of

orbital effects in attractively interacting atomic mixtures. The results are of

direct relevance to recent experiments with 87Rb - 40K mixtures, where a large

shift of the critical point has been found.

\\ ( http://arxiv.org/abs/0711.2975 , 37kb)

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arXiv:0711.2173 (*cross-listing*)

Date: Wed, 14 Nov 2007 11:55:27 GMT (6kb)

Title: Statistical ensemble equivalence problem

Authors: Ludwik Turko

Categories: hep-th cond-mat.stat-mech

Comments: 5 pages, Talk given at the conference ''New Trends in High Energy

Physics'', Crimea 2007, Yalta, 15-22 September 2007

\\

A problem of the equivalence of statistical ensembles is critically analyzed.

It is shown, that although different probability distributions of statistical

physics have the same behavior in the thermodynamic limit, there are physical

observables -- semi-intensive variables -- which keep memory of the underlying

ensembles. This property is an universal one and can be observed even in the

simplest case of the grand canonical and canonical ensembles of the classical

statistical physics.

\\ ( http://arxiv.org/abs/0711.2173 , 6kb)

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arXiv:0711.2750

Date: Sat, 17 Nov 2007 16:59:27 GMT (496kb)

Title: Double Electromagnetically Induced Transparency in a Tripod-type Atom

System

Authors: Xiao Li, Yu Liu, and Hong Guo

Categories: quant-ph

Comments: 5 pages, and 8 figures

\\

The electromagnetically induced transparency (EIT) phenomenon in a four level

atomic system with tripod configuration is studied. The results show that this

configuration is equivalent to the combination of two single three-level

$\Lambda$ configurations, which, under certain conditions, results in the

so-called double-EIT (DEIT) phenomenon. The properties of the double

transparency windows for DEIT are discussed in detail and the possible

experimental scheme is proposed.

\\ ( http://arxiv.org/abs/0711.2750 , 496kb)

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arXiv:0711.3102

Date: Tue, 20 Nov 2007 10:06:24 GMT (202kb)

Title: Atom laser dynamics in a tight-waveguide

Authors: A. del Campo, I. Lizuain, M. Pons, J. G. Muga, M. Moshinsky

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

Comments: 6 pages, 5 figures, to be published in the Proceedings of the 395th

WE-Heraeus Seminar on "Time Dependent Phenomena in Quantum Mechanics ",

organized by T. Kramer and M. Kleber (Blaubeuren, Germany, September 2007)

\\

We study the transient dynamics that arise during the formation of an atom

laser beam in a tight waveguide. During the time evolution the density profile

develops a series of wiggles which are related to the diffraction in time

phenomenon. The apodization of matter waves, which relies on the use of smooth

aperture functions, allows to suppress such oscillations in a time interval,

after which there is a revival of the diffraction in time. The revival time

scale is directly related to the inverse of the harmonic trap frequency for the

atom reservoir.

\\ ( http://arxiv.org/abs/0711.3102 , 202kb)

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arXiv:0711.3105

Date: Tue, 20 Nov 2007 10:19:56 GMT (149kb)

Title: Optical properties of atomic Mott insulators: from slow light to

dynamical Casimir effects

Authors: Iacopo Carusotto, Mauro Antezza, Francesco Bariani, Simone De

Liberato, Cristiano Ciuti

Categories: cond-mat.other

\\

We theoretically study the optical properties of a gas of ultracold,

coherently dressed three-level atoms in a Mott insulator phase of an optical

lattice. The vacuum state, the band dispersion and the absorption spectrum of

the polariton field can be controlled in real time by varying the amplitude and

the frequency of the dressing beam. In the weak dressing regime, the system

shows unique ultra-slow light propagation properties without absorption. In the

presence of a fast time modulation of the dressing amplitude, we predict a

significant emission of photon pairs by parametric amplification of the

polaritonic zero-point fluctuations. Quantitative considerations on the

experimental observability of such a dynamical Casimir effect are presented for

the most promising atomic species and level schemes.

\\ ( http://arxiv.org/abs/0711.3105 , 149kb)

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arXiv:0711.3116

Date: Tue, 20 Nov 2007 11:11:13 GMT (985kb)

Title: Seeking better times: atomic clocks in the generalized Tonks-Girardeau

regime

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

Categories: quant-ph

Comments: 12 pages, 10 figures,to be published in the Proceedings of the 395th

WE-Heraeus Seminar on "Time Dependent Phenomena in Quantum Mechanics ",

organized by T. Kramer and M. Kleber (Blaubeuren, Germany, September 2007)

\\

This article is based on the talk with the same title at the Blaubeuren

meeting. First we discuss briefly the importance of time and time keeping,

explaining the basic functioning of clocks in general and atomic clocks in

particular, which rely on Ramsey interferometry. The usefulness of cold atoms

is discussed as well as their limits in Bose-Einstein condensates. An

alternative that we study is a different cold-atom regime: the Tonks-Girardeau

(TG) gas of tightly confined and strongly interacting bosons. The TG gas is

reviewed and then generalized for two-level atoms. Finally, we explore the

combination of Ramsey interferometry and TG gases.

\\ ( http://arxiv.org/abs/0711.3116 , 985kb)

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arXiv:0710.5444 (*cross-listing*)

Date: Mon, 29 Oct 2007 14:47:24 GMT (57kb)

Title: Light propagation in atomic Mott Insulators

Authors: Francesco Bariani, Iacopo Carusotto

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

\\

We study radiation-matter interaction in a system of ultracold atoms trapped

in an optical lattice in a Mott insulator phase. We develop a fully general

quantum model, and we perform calculations for a one-dimensional geometry at

normal incidence. Both two- and three-level $\Lambda$ atomic configurations are

studied. The polariton dispersion and the reflectivity spectra are

characterized in the different regimes, for both semi-infinite and finite-size

geometries. We apply this model to propose a photon energy lifter experiment: a

device which is able to shift the carrier frequency of a slowly travelling

wavepacket without affecting the pulse shape nor its coherence.

\\ ( http://arxiv.org/abs/0710.5444 , 57kb)

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arXiv:0711.3006 (*cross-listing*)

Date: Mon, 19 Nov 2007 19:59:16 GMT (24kb,D)

Title: Strongly-Paired Fermions: Cold Atoms and Neutron Matter

Authors: Alexandros Gezerlis and J. Carlson

Categories: nucl-th cond-mat.other

Comments: 4 pages, 4 figures

\\

Experiments with cold Fermi atoms can be tuned to probe strongly-interacting

fluids that are very similar to the low-density neutron matter found in the

crusts of neutron stars. In contrast to traditional superfluids and

superconductors, matter in this regime is very strongly paired, with gaps of

the order of the Fermi energy. We compute the T=0 equation of state and pairing

gap for cold atoms and low-density neutron matter as a function of the Fermi

momentum times the scattering length. Results of Quantum Monte Carlo

calculations show that the equations of state are very similar. The neutron

matter pairing gap at low densities is found to be very large but, except at

the smallest densities, significantly suppressed relative to cold atoms because

of the finite effective range in the neutron-neutron interaction.

\\ ( http://arxiv.org/abs/0711.3006 , 24kb)

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arXiv:0711.3230

Date: Tue, 20 Nov 2007 23:07:51 GMT (152kb,D)

Title: Many-body Landau-Zener tunneling in the Bose-Hubbard model

Authors: Andrea Tomadin, Riccardo Mannella, Sandro Wimberger

Categories: cond-mat.str-el

Comments: 10 pages, 6 figures. High-quality figures can be requested to the

authors

\\

We study a model for ultracold, spinless atoms in quasi-one dimensional

optical lattices and subjected to a tunable tilting force. Statistical tests

are employed to quantitatively characterize the spectrum of the Floquet-Bloch

operator of the system along the transition from the regular to the quantum

chaotic regime. Moreover, we perturbatively include the coupling of the

one-band model to the second energy band. This allows us to study the

Landau-Zener interband tunneling within a truly many-body description of

ultracold atoms. The distributions of the computed tunneling rates provide an

independent and experimentally accessible signature of the regular-chaotic

transition.

\\ ( http://arxiv.org/abs/0711.3230 , 152kb)

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arXiv:0711.3270

Date: Wed, 21 Nov 2007 07:46:30 GMT (116kb)

Title: Observing Zitterbewegung in Ultracold Atoms

Authors: J. Y. Vaishnav, Charles W. Clark

Categories: cond-mat.mes-hall

\\

We propose an optical lattice scheme which would permit the experimental

observation of Zitterbewegung (ZB) with ultracold, neutral atoms. A four-level

"tripod" variant of the usual setup for stimulated Raman adiabatic passage

(STIRAP) has been proposed for generating non-Abelian gauge fields [1].

Dirac-like Hamiltonians, which exhibit ZB, are simple examples of such

non-Abelian gauge fields; we show how a variety of them can arise, and how ZB

can be observed, in a tripod system. We predict that the ZB should occur at

experimentally accessible frequencies and amplitudes.

\\ ( http://arxiv.org/abs/0711.3270 , 116kb)

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arXiv:0711.3406

Date: Wed, 21 Nov 2007 16:42:21 GMT (242kb)

Title: Ultra-cold dipolar gases

Authors: Chiara Menotti and Maciej Lewenstein

Categories: cond-mat.other

Comments: 11 pages, 11 figures, to be published in the Proceedings of the

RPMBT14 conference (Barcelona, July 2007), Series on Advances in Quantum

Many-Body Theory, World Scientific

\\

We present a concise review of the physics of ultra-cold dipolar gases, based

mainly on the theoretical developments in our own group. First, we discuss

shortly weakly interacting ultra-cold trapped dipolar gases. Dipolar

Bose-Einstein condensates exhibit non-standard instabilities and the physics of

both Bose and Fermi dipolar gases depends on the trap geometry. We focus then

the second part of the paper on strongly correlated dipolar gases and discuss

ultra-cold dipolar gases in optical lattices. Such gases exhibit a spectacular

richness of quantum phases and metastable states, which may perhaps be used as

quantum memories. We comment shortly on the possibility of superchemistry

aiming at the creation of dipolar heteronuclear molecules in lattices. Finally,

we turn to ultra-cold dipolar gases in artificial magnetic fields, and consider

rotating dipolar gases, that provide in our opinion the best option towards the

realization of the fractional quantum Hall effect and quantum Wigner crystals.

\\ ( http://arxiv.org/abs/0711.3406 , 242kb)

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arXiv:0711.3422

Date: Wed, 21 Nov 2007 17:52:47 GMT (432kb)

Title: Dipolar interaction in ultra-cold atomic gases

Authors: C. Menotti, M. Lewenstein, T. Lahaye, and T. Pfau

Categories: cond-mat.other

Comments: 30 pages, 17 figures, to be published in the Proceedings of the

Workshop "Dynamics and Thermodynamics of Systems with Long Range

Interactions" (Assisi, July 2007), AIP Conference Proceedings

\\

Ultra-cold atomic systems provide a new setting where to investigate the role

of long-range interactions. In this paper we will review the basics features of

those physical systems, in particular focusing on the case of Chromium atoms.

On the experimental side, we report on the observation of dipolar effects in

the expansion dynamics of a Chromium Bose-Einstein condensate. By using a

Feshbach resonance, the scattering length characterising the contact

interaction can be strongly reduced, thus increasing the relative effect of the

dipole-dipole interaction. Such experiments make Chromium atoms the strongest

candidates at present for the achievement of the strong dipolar regime.

On the theoretical side, we investigate the behaviour of ultra-cold dipolar

systems in the presence of a periodic potential. We discuss how to realise this

situation experimentally and we characterise the system in terms of its quantum

phases and metastable states, discussing in detail the differences with respect

to the case of zero-range interactions.

\\ ( http://arxiv.org/abs/0711.3422 , 432kb)

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arXiv:0711.3425

Date: Wed, 21 Nov 2007 18:26:17 GMT (15kb)

Title: Achieving the Neel state in an optical lattice

Authors: Arnaud Koetsier, R. A. Duine, Immanuel Bloch, H. T. C. Stoof

Categories: cond-mat.stat-mech

Comments: 4 pages, 2 figures, RevTeX

\\

We theoretically study the possibility of reaching the antiferromagnetic

phase of the Hubbard model by starting from a normal gas of trapped fermionic

atoms and adiabatically ramping up an optical lattice. Requirements on the

initial temperature and the number of atoms are determined for a three

dimensional square lattice by evaluating the Neel state entropy, taking into

account fluctuations around the mean-field solution. We find that these

fluctuations place important limitations on adiabatically reaching the Neel

state.

\\ ( http://arxiv.org/abs/0711.3425 , 15kb)

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arXiv:0711.3431

Date: Wed, 21 Nov 2007 18:52:04 GMT (250kb)

Title: Quantum phase transition in a ferromagnetic Bose-Einstein condensate:

dynamics from the broken-symmetry to the polar phase

Authors: Bogdan Damski and Wojciech H. Zurek

Categories: cond-mat.other

Comments: 10 pages, 11 figures

Report-no: LAUR-07-7540

\\

We discuss the dynamics of a quantum phase transition in a spin-1

Bose-Einstein condensate when it is driven from the magnetized broken-symmetry

phase to the unmagnetized polar phase. We determine where the condensate goes

out of equilibrium as it approaches the critical point, and compute

magnetization at the critical point. We also study magnetization oscillations

in the polar phase, and explain in detail how they are affected by

non-equilibrium dynamics near a critical point.

\\ ( http://arxiv.org/abs/0711.3431 , 250kb)

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arXiv:0711.3244

Date: Wed, 21 Nov 2007 01:34:55 GMT (849kb)

Title: Doppler-free, Multi-wavelength Acousto-optic deflector for two-photon

addressing arrays of Rb atoms in a Quantum Information Processor

Authors: Sangtaek Kim, Robert R. Mcleod, Mark Saffman, and Kelvin H. Wagner

Categories: quant-ph

Comments: 28 pages, 16 figures, submitted to Applied Optics

\\

We demonstrate a dual wavelength acousto-optic deflector (AOD) designed to

deflect two wavelengths to the same angles by driving with two RF frequencies.

The AOD is designed as a beam scanner to address two-photon transitions in a

two-dimensional array of trapped neutral Rb atoms in a quantum computer.

Momentum space is used to design AODs that have the same diffraction angles for

two wavelengths (780 nm and 480 nm) and have non-overlapping Bragg-matched

frequency response at these wavelengths, so that there will be no crosstalk

when proportional RF frequencies are applied to diffract the two wavelengths.

The appropriate crystal orientation, crystal shape, transducer size, and

transducer height are determined for an AOD made with a Tellurium dioxide

crystal (TeO2). The designed and fabricated AOD has more than 100 resolvable

spots, widely separated bandshapes for the two wavelengths within an overall

octave bandwidth, spatially overlapping diffraction angles for both wavelengths

(780 nm and 480 nm), and a 4 usec or less access time. Cascaded AODs in which

the first device upshifts and the second downshifts allow Doppler-free scanning

as required for addressing the narrow atomic resonance without detuning. We

experimentally show the diffraction-limited Doppler-free scanning performance

and spatial resolution of the designed AOD.

\\ ( http://arxiv.org/abs/0711.3244 , 849kb)

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arXiv:0711.3238

Date: Wed, 21 Nov 2007 00:02:39 GMT (267kb)

Title: Suppression of molecular decay in ultracold gases without Fermi

statistics

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

Categories: physics.atom-ph

\\

We study inelastic processes for ultracold three-body systems in which only

one interaction is resonant. We have found that the decay rates for weakly

bound molecules due to collisions with other atoms can be suppressed not only

without fermionic statistics but also when bosonic statistics applies. In

addition, we show that at ultracold temperatures three-body recombination

involving a single resonant pair of atoms leads mainly to formation of weakly

bound molecules which, in turn, are stable against decay. These results

indicate that recombination in three-component atomic gases can be used as an

efficient mechanism for molecular formation, allowing the achievement of high

molecular densities.

\\ ( http://arxiv.org/abs/0711.3238 , 267kb)

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arXiv:cond-mat/0609059

replaced with revised version Fri, 16 Nov 2007 08:17:48 GMT (813kb)

Title: Anomalous Heat Conduction in Quasi-One-Dimensional Gases

Authors: Taka H. Nishino

Categories: cond-mat.stat-mech

Comments: 10 pages, 4 figures

Journal-ref: Progress of Theoretical Physics, 118 (2007) 657

\\ ( http://arxiv.org/abs/cond-mat/0609059 , 813kb)

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arXiv:0709.0362

replaced with revised version Fri, 16 Nov 2007 09:29:01 GMT (226kb)

Title: Non-perturbative renormalization-group approach to zero-temperature Bose

systems

Authors: N. Dupuis and K. Sengupta

Categories: cond-mat.other hep-th

Comments: v1) 6 pages, 8 figures; v2) added references; v3) corrected typos

Journal-ref: Europhys. Lett. 80, 50007 (2007)

DOI: 10.1209/0295-5075/80/50007

\\ ( http://arxiv.org/abs/0709.0362 , 226kb)

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arXiv:0709.3158

replaced with revised version Fri, 16 Nov 2007 16:00:56 GMT (110kb)

Title: Twin peaks in rf spectra of Fermi gases at unitarity in the normal phase

Authors: P. Massignan, G. M. Bruun and H. T. C. Stoof

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

Comments: v2: added spectra of both the majority and the minority components of

an imbalanced Fermi gas

\\ ( http://arxiv.org/abs/0709.3158 , 110kb)

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arXiv:0704.0763

replaced with revised version Fri, 16 Nov 2007 09:31:45 GMT (316kb)

Title: Coherent control of atomic tunneling

Authors: John Martin and Daniel Braun

Categories: quant-ph

Comments: 6 pages revtex, 4 figures, extended version including numerical

results taking into account higher vibrationnal levels

\\ ( http://arxiv.org/abs/0704.0763 , 316kb)

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arXiv:cond-mat/0702343

replaced with revised version Fri, 16 Nov 2007 21:19:30 GMT (12kb)

Title: Spectroscopy of Collective Excitations in Interacting Low-Dimensional

Many-Body Systems Using Quench Dynamics

Authors: Vladimir Gritsev, Eugene Demler, Mikhail Lukin, Anatoli Polkovnikov

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

Comments: 4 pages, 2 figures; replaced with revised version

Journal-ref: Phys. Rev. Lett. 99, 200404 (2007)

DOI: 10.1103/PhysRevLett.99.200404

\\ ( http://arxiv.org/abs/cond-mat/0702343 , 12kb)

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arXiv:quant-ph/0703160 (*cross-listing*)

replaced with revised version Mon, 19 Nov 2007 04:58:45 GMT (14kb)

Title: Quantum origin of quantum jumps: Breaking of unitary symmetry induced by

information transfer and the transition from quantum to classical

Authors: Wojciech Hubert Zurek

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

Comments: Final version with an extended discussion of the implications

\\ ( http://arxiv.org/abs/quant-ph/0703160 , 14kb)

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arXiv:0709.0698

replaced with revised version Tue, 20 Nov 2007 18:39:14 GMT (254kb)

Title: Probing two-fluid hydrodynamics in a trapped Fermi superfluid at

unitarity

Authors: Edward Taylor, Hui Hu, Xia-Ji Liu, Allan Griffin

Categories: cond-mat.other

Comments: Figures 1-3 modified, Figure 4 added, minor changes made in text,

references updated

\\ ( http://arxiv.org/abs/0709.0698 , 254kb)

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Till next time,

Matt.

-- ========================================================================= Dr M. J. Davis, Senior Lecturer in Physics School of Physical Sciences, email: mdavis_at_physics.uq.edu.au University of Queensland, ph : +61 7 334 69824 Brisbane, QLD 4072, fax : +61 7 336 51242 Australia. http://www.physics.uq.edu.au/people/mdavis/ ========================================================================= Matt's arXiv selection: weekly summary of cold-atom papers from arXiv.org http://www.physics.uq.edu.au/people/mdavis/matts_arXiv/ ========================================================================= Legal stuff: Unless stated otherwise, this e-mail represents only the views of the sender and not the views of the University of Queensland =========================================================================Received on Wed Dec 19 2007 - 08:35:28 EST

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