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

Date: Wed, 30 Aug 2006 10:37:44 +1000 (EST)

Date: Wed, 30 Aug 2006 10:37:44 +1000 (EST)

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

Another delayed arXiv mailing this week. Next week I hope things will be back

to normal!

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

The abstracts:

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Paper: cond-mat/0410417

replaced with revised version Fri, 18 Aug 2006 06:53:33 GMT (544kb)

Title: Universality in Few-body Systems with Large Scattering Length

Authors: Eric Braaten (Ohio State U.), H.-W. Hammer (INT and Bonn U.)

Comments: 219 pages, 58 figures, accepted for publication in Physics Reports,

erroneous footnote on p. 200 removed

Report-no: INT-PUB 04-27, HISKP-TH-06-07

Subj-class: Other; Soft Condensed Matter

Journal-ref: Phys.Rept. 428 (2006) 259-390

\\ ( http://arXiv.org/abs/cond-mat/0410417 , 544kb)

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Paper: cond-mat/0602475

replaced with revised version Fri, 18 Aug 2006 14:59:22 GMT (168kb)

Title: Full quantum distribution of contrast in interference experiments

between interacting one dimensional Bose liquids

Authors: Vladimir Gritsev, Ehud Altman, Eugene Demler, Anatoli Polkovnikov

Comments: 9 pages, 5 figures; Accepted for publication in Nature Physics

Subj-class: Strongly Correlated Electrons; Mesoscopic Systems and Quantum Hall

Effect

\\ ( http://arXiv.org/abs/cond-mat/0602475 , 168kb)

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Paper: cond-mat/0606672

replaced with revised version Fri, 18 Aug 2006 12:37:14 GMT (15kb)

Title: Shot noise of interference between independent atomic systems

Authors: Anatoli Polkovnikov

Comments: 5 pages, 1 figure, revised version, added discussion of shot noise

for extended systems

Subj-class: Statistical Mechanics; Disordered Systems and Neural Networks

\\ ( http://arXiv.org/abs/cond-mat/0606672 , 15kb)

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Paper: quant-ph/0608140

Date: Fri, 18 Aug 2006 19:01:11 GMT (2402kb)

Title: 1951 Lectures on Advanced Quantum Mechanics Second Edition

Authors: Freeman J. Dyson

Comments: 149 page 10pt report class LateX document using many special

formatting packages and including 10 EPS graphics files loaded with the

graphicx package

\\

The legendary 1951 Dyson Lectures on Advanced Quantum Mechanics are finally

LaTeXed, with thorough annotations and an index as an added bonus. See the

Typist's Afterward preceding the backmatter for an explanation of this new

version, and for the historical context see the website:

http://hrst.mit.edu/hrs/renormalization/dyson51-intro/ as well as the author's

website at the Princeton Institute for Advanced Study:

http://www.sns.ias.edu/~dyson/

\\ ( http://arXiv.org/abs/quant-ph/0608140 , 2402kb)

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Paper (*cross-listing*): gr-qc/0608081

Date: Thu, 17 Aug 2006 08:38:29 GMT (7kb)

Title: Optical Clocks in Space

Authors: S. Schiller, A. Goerlitz, A. Nevsky, J.C.J. Koelemeij, A. Wicht, P.

Gill, H. A. Klein, H. S. Margolis, G. Mileti, U. Sterr, F. Riehle, E. Peik,

Chr. Tamm, W. Ertmer, E. Rasel, V. Klein, C. Salomon, G.M. Tino, P. Lemonde,

R. Holzwarth, T.W. Haensch

Comments: Proc. III International Conference on Particle and Fundamental

Physics in Space (SpacePart06), Beijing 19 - 21 April 2006, to appear in

Nucl. Phys. B

\\

The performance of optical clocks has strongly progressed in recent years,

and accuracies and instabilities of 1 part in 10^18 are expected in the near

future. The operation of optical clocks in space provides new scientific and

technological opportunities. In particular, an earth-orbiting satellite

containing an ensemble of optical clocks would allow a precision measurement of

the gravitational redshift, navigation with improved precision, mapping of the

earth's gravitational potential by relativistic geodesy, and comparisons

between ground clocks.

\\ ( http://arXiv.org/abs/gr-qc/0608081 , 7kb)

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Paper: quant-ph/0606082

replaced with revised version Fri, 18 Aug 2006 18:18:26 GMT (165kb)

Title: Microwave potentials and optimal control for robust quantum gates on an

atom chip

Authors: Philipp Treutlein, Theodor W. H\"ansch, Jakob Reichel, Antonio

Negretti, Markus A. Cirone, Tommaso Calarco

Comments: 14 pages, 7 figures, 1 table. Published version (minor changes)

Journal-ref: Phys. Rev. A 74, 022312 (2006)

\\ ( http://arXiv.org/abs/quant-ph/0606082 , 165kb)

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Paper: physics/0608189

Date: Fri, 18 Aug 2006 10:39:00 GMT (523kb)

Title: Detecting Neutral Atoms on an Atom Chip

Authors: M. Wilzbach, A. Haase, M. Schwarz, D. Heine, K. Wicker, X. Liu, K.-H.

Brenner, S. Groth, Th. Fernholz, B. Hessmo, J. Schmiedmayer

Comments: 13 pages, 12 figures

Subj-class: Atomic Physics

Journal-ref: Fortschr. Phys. 54 (2006), 746 - 764

DOI: 10.1002/prop.200610323

\\

Detecting single atoms (qubits) is a key requirement for implementing quantum

information processing on an atom chip. The detector should ideally be

integrated on the chip. Here we present and compare different methods capable

of detecting neutral atoms on an atom chip. After a short introduction to

fluorescence and absorption detection we discuss cavity enhanced detection of

single atoms. In particular we concentrate on optical fiber based detectors

such as fiber cavities and tapered fiber dipole traps. We discuss the various

constraints in building such detectors in detail along with the current

implementations on atom chips. Results from experimental tests of fiber

integration are also described. In addition we present a pilot experiment for

atom detection using a concentric cavity to verify the required scaling.

\\ ( http://arXiv.org/abs/physics/0608189 , 523kb)

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Paper: cond-mat/0608449

Date: Mon, 21 Aug 2006 04:21:31 GMT (229kb)

Title: Investigation and comparison of multi-state and two-state atom laser

output-couplers

Authors: J. Dugue, N. P. Robins, C. Figl, M. Jeppesen, P. Summers, J. J. Hope

and J. D. Close

Comments: 9 pages, 8 figures

Subj-class: Other

\\

We investigate the spatial structure and temporal dynamics created in a

Bose-Einstein condensate (BEC) by radio-frequency (RF) atom laser

output-couplers using a one-dimensional mean-field model. We compare the

behavior of a `pure' two-state atom laser to the multi-level systems

demonstrated in laboratories. In particular, we investigate the peak

homogeneous output flux, classical fluctuations in the beam and the onset of a

bound state which shuts down the atom laser output.

\\ ( http://arXiv.org/abs/cond-mat/0608449 , 229kb)

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Paper: cond-mat/0608454

Date: Mon, 21 Aug 2006 09:57:11 GMT (128kb)

Title: Stability conditions and phase diagrams for two component Fermi gases

with population imbalance

Authors: Qijin Chen, Yan He, Chih-Chun Chien, and K. Levin

Comments: 11 pages, 8 figures

Subj-class: Superconductivity; Strongly Correlated Electrons

\\

Superfluidity in atomic Fermi gases with population imbalance has recently

become an exciting research focus. There is considerable disagreement in the

literature about the appropriate stability conditions for states in the phase

diagram throughout the BCS to Bose-Einstein condensation (BEC) crossover. Here

we discuss these stability conditions for homogeneous polarized superfluid

phases, and compare with recent alternative proposals. The requirement of a

positive second order partial derivative of the thermodynamic potential with

respect to the fermionic excitation gap $\Delta$ (at fixed chemical potentials)

is demonstrated to be equivalent to the positive definiteness of the particle

number susceptibility matrix. In addition, we show the positivity of the

effective pair mass constitutes another nontrivial stability condition. These

conditions determine the stability of the system towards phase separation of

one form or another. We also study systematically the effects of finite

temperature and the related pseudogap on the phase diagrams defined by our

stability conditions.

\\ ( http://arXiv.org/abs/cond-mat/0608454 , 128kb)

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Paper: cond-mat/0608455

Date: Mon, 21 Aug 2006 17:51:55 GMT (863kb)

Title: Deformation of Trapped Fermi Gases with Unequal Spin Populations

Authors: G. B. Partridge, W. Li, Y. A. Liao, R. G. Hulet, M. Haque & H. T. C.

Stoof

Subj-class: Other; Superconductivity

\\

The formation of electron pairs, each pair consisting of a spin-up and a

spin-down electron, underlies the phenomenon of superconductivity. While the

population of each spin component is generally equal in superconductors, an

imbalance is readily produced in experiments with gases of trapped, ultracold

fermionic atoms, as was recently demonstrated. Exotic new states of matter are

predicted for the unbalanced system that, if realized, may have important

implications for our understanding of nuclei, compact stars, and quantum

chromodynamics. We previously reported evidence for a phase separation in a

strongly-interacting two-component Fermi gas to a state containing a paired

central core, with the excess unpaired atoms residing outside this core. We

show here that the real-space distributions of the gas deform markedly with

increasing imbalance in order to produce a core that is uniformly paired. These

deformations are inconsistent with local space isotropy as embodied by the

local-density approximation (LDA). The breakdown of the LDA is surprising as

the correlation length is small compared with the characteristic size of the

gas. A possible explanation, considered here, is that an anisotropic nematic

ordering develops. The observed violations of the LDA may be facilitated by the

high aspect ratio trapping geometry employed in the experiment. We find that

these deformations can be suppressed at higher temperature.

\\ ( http://arXiv.org/abs/cond-mat/0608455 , 863kb)

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Paper: physics/0608060

Date: Sat, 5 Aug 2006 10:27:45 GMT (412kb)

Title: Matter-wave soliton control in optical lattices with topological

dislocations

Authors: Yaroslav V. Kartashov, Lluis Torner

Comments: 15 pages, 4 figures, to appear in Physical Review A

Subj-class: Optics; Materials Science

\\

We address the concept of guiding and transporting matter-wave solitons along

the channels of optical lattices made by interference patterns of beams

containing topological wavefront dislocations. The local lattice distortions

that occur around the dislocations cause solitons to move along reconfigurable

paths, a phenomenon that may be used for controlled all-optical manipulation of

Bose-Einstein condensates. Multiple dislocations form traps that can capture

and hold moving solitons.

\\ ( http://arXiv.org/abs/physics/0608060 , 412kb)

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Paper: cond-mat/0604557

replaced with revised version Fri, 18 Aug 2006 23:06:10 GMT (140kb)

Title: Stable Skyrmions in spinor condensates

Authors: Igor F. Herbut and Masaki Oshikawa

Comments: 4 pages, 2 figures; few typos corrected, references updated, to

appear in Phys. Rev. Lett

Subj-class: Superconductivity; Statistical Mechanics; Pattern Formation and

Solitons

\\ ( http://arXiv.org/abs/cond-mat/0604557 , 140kb)

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Paper: cond-mat/0604558

replaced with revised version Mon, 21 Aug 2006 17:19:59 GMT (946kb)

Title: Phase diagram of a polarized Fermi gas across a Feshbach resonance in a

potential trap

Authors: W. Yi and L.-M. Duan

Comments: 9 pages, 4 figures

Subj-class: Other

Journal-ref: Phys. Rev. A. 74, 013610 (2006)

DOI: 10.1103/PhysRevA.74.013610

\\ ( http://arXiv.org/abs/cond-mat/0604558 , 946kb)

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Paper: cond-mat/0607361

replaced with revised version Mon, 21 Aug 2006 07:34:56 GMT (101kb)

Title: Collective excitations of a Bose-Einstein condensate in an anharmonic

trap

Authors: Guan-Qiang Li, Li-Bin Fu, Ju-Kui Xue, Xu-Zong Chen, and Jie Liu

Comments: 5 pages, 4 figures

Subj-class: Mesoscopic Systems and Quantum Hall Effect

\\ ( http://arXiv.org/abs/cond-mat/0607361 , 101kb)

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Paper: cond-mat/0607453

replaced with revised version Mon, 21 Aug 2006 15:43:28 GMT (48kb)

Title: Orthogonality catastrophe and shock waves in a non-equilibrium Fermi gas

Authors: E. Bettelheim, A. G. Abanov, and P. Wiegmann

Comments: 5 pages, 1 figure, revtex4, prl

Subj-class: Strongly Correlated Electrons; Mesoscopic Systems and Quantum Hall

Effect

\\ ( http://arXiv.org/abs/cond-mat/0607453 , 48kb)

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Paper: quant-ph/0608158

Date: Mon, 21 Aug 2006 15:49:45 GMT (88kb)

Title: How much entanglement can be generated between two atoms by detecting

photons?

Authors: L. Lamata, J.J. Garcia-Ripoll, J.I. Cirac

Comments: 4 pages, 3 figures

\\

It is possible to achieve an arbitrary amount of entanglement between two

atoms using only spontaneously emitted photons, linear optics, single photon

sources and projective measurements. This is in contrast to all current

experimental proposals for entangling two atoms, which are fundamentally

restricted to one ebit.

\\ ( http://arXiv.org/abs/quant-ph/0608158 , 88kb)

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Paper: physics/0608200

Date: Sat, 19 Aug 2006 00:13:49 GMT (250kb)

Title: Cold collisions of OH and Rb. I: the free collision

Authors: Manuel Lara, John L. Bohn, Daniel E. Potter, Pavel Sold\'an and Jeremy

M. Hutson

Comments: 20 pages, 16 figures

Subj-class: Atomic Physics; Chemical Physics

\\

We have calculated elastic and state-resolved inelastic cross sections for

cold and ultracold collisions in the Rb($^1 S$) + OH($^2 \Pi_{3/2}$) system,

including fine-structure and hyperfine effects. We have developed a new set of

five potential energy surfaces for Rb-OH($^2 \Pi$) from high-level {\em ab

initio} electronic structure calculations, which exhibit conical intersections

between covalent and ion-pair states. The surfaces are transformed to a

quasidiabatic representation. The collision problem is expanded in a set of

channels suitable for handling the system in the presence of electric and/or

magnetic fields, although we consider the zero-field limit in this work.

Because of the large number of scattering channels involved, we propose and

make use of suitable approximations. To account for the hyperfine structure of

both collision partners in the short-range region we develop a

frame-transformation procedure which includes most of the hyperfine

Hamiltonian. Scattering cross sections on the order of $10^{-13}$ cm$^2$ are

predicted for temperatures typical of Stark decelerators. We also conclude that

spin orientation of the partners is completely disrupted during the collision.

Implications for both sympathetic cooling of OH molecules in an environment of

ultracold Rb atoms and experimental observability of the collisions are

discussed.

\\ ( http://arXiv.org/abs/physics/0608200 , 250kb)

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Paper: cond-mat/0608472

Date: Tue, 22 Aug 2006 10:05:42 GMT (20kb)

Title: Conserving Gapless Mean-Field Theory of a Multi-Component Bose-Einstein

Condensate

Authors: Yoshiyuki Kondo, Takafumi Kita

Comments: 7 pages, 7 figures

Subj-class: Statistical Mechanics

\\

We develop a mean-field theory for Bose-Einstein condensation of spin-1 atoms

with internal degrees of freedom. It is applicable to nonuniform systems at

finite temperatures with a plausible feature of satisfying the Hugenholtz-Pines

theorem and various conservation laws simultaneously. Using it, we clarify

thermodynamic properties and the excitation spectra of a uniform gas. The

condensate is confirmed to remain in the same internal state from T=0 up to

$T_{c}$ for both antiferromagnetic and ferromagnetic interactions. The

excitation spectra of the antiferromagnetic (ferromagnetic) interaction are

found to have only a single gapless mode, contrary to the prediction of the

Bogoliubov theory where three (two) of them are gapless.

\\ ( http://arXiv.org/abs/cond-mat/0608472 , 20kb)

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Paper: cond-mat/0608477

Date: Tue, 22 Aug 2006 14:11:48 GMT (44kb)

Title: NNLO epsilon expansion for a Fermi gas at infinite scattering length

Authors: Peter Arnold, Joaquin E. Drut, and Dam Thanh Son

Comments: 26 pages, 14 figures

Report-no: INT PUB 06-12

Subj-class: Other

\\

We extend previous work on applying the epsilon-expansion to universal

properties of a cold, dilute Fermi gas in the unitary regime of infinite

scattering length. We compute the ratio xi = mu/epsilon_F of chemical potential

to ideal gas Fermi energy to next-to-next-to-leading order (NNLO) in

epsilon=4-d, where d is the number of spatial dimensions. We also explore the

nature of corrections from the order after NNLO.

\\ ( http://arXiv.org/abs/cond-mat/0608477 , 44kb)

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Paper: cond-mat/0608491

Date: Tue, 22 Aug 2006 19:56:06 GMT (310kb)

Title: Supersolids in Confined Fermions on One-Dimensional Optical Lattices

Authors: F. Karim Pour, M. Rigol, S. Wessel, A. Muramatsu

Comments: 4 pages, 4 figures

Subj-class: Strongly Correlated Electrons; Superconductivity

\\

Using quantum Monte Carlo simulations, we show that density-density and

pairing correlation functions of the one-dimensional attractive fermionic

Hubbard model in a harmonic confinement potential are characterized by the

anomalous dimension $K_\rho$ of a corresponding periodic system. This allows to

determine conditions for a supersolid state inside a harmonic trap. We show

explicitely, that under such conditions the structure form factors for both

correlation functions diverge with the same exponent upon increasing the system

size, thus giving rise to a (quasi-)supersolid.

\\ ( http://arXiv.org/abs/cond-mat/0608491 , 310kb)

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Paper: cond-mat/0607334

replaced with revised version Tue, 22 Aug 2006 09:24:29 GMT (63kb)

Title: Bragg Spectroscopy of Cold Atomic Fermi Gases

Authors: G. M. Bruun, Gordon Baym

Comments: 8 pages, 9 figures

Subj-class: Superconductivity

\\ ( http://arXiv.org/abs/cond-mat/0607334 , 63kb)

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Paper: quant-ph/0508185

replaced with revised version Tue, 22 Aug 2006 10:27:38 GMT (10kb)

Title: Dynamic response of interacting one-dimensional fermions in the harmonic

atom trap: Phase response and the inhomogeneous mobility

Authors: W. Wonneberger

Comments: 16 pages, LaTex, changed content

Journal-ref: Physics Letters A 356 (2006) 272-276

\\ ( http://arXiv.org/abs/quant-ph/0508185 , 10kb)

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Paper: cond-mat/0608501

Date: Wed, 23 Aug 2006 08:56:31 GMT (47kb)

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

Sheehy and Radzihovsky

Authors: C.-H. Pao, S.-T. Wu and S.-K. Yip

Comments: 6 pages, 1 figure

Subj-class: Superconductivity; Strongly Correlated Electrons

\\

The reason behind the discrepancy between the phase diagrams of our earlier

work [1] and the comment of Sheehy and Radzihovsky [2] is discussed. We show

that, in contrast to what is claimed in [2], the requirement of positive

susceptibility is sufficient to rule out states that are local maximum of the

free energy (as a function of the order parameter $\Delta$

\\ ( http://arXiv.org/abs/cond-mat/0608501 , 47kb)

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Paper: quant-ph/0608177

Date: Wed, 23 Aug 2006 12:57:39 GMT (11kb)

Title: Fermionic coherent states for pseudo-Hermitian two-level Systems

Authors: O. Cherbal, M. Drir, M. Maamache, and D.A. Trifonov

Comments: 13 pages (Latex, article class), no figures

\\

We introduce creation and annihilation operators of pseudo-Hermitian fermions

for two-level systems described by pseudo-Hermitian Hamiltonian with real

eigenvalues. This allows the generalization of the fermionic coherent states

approach to such systems. Pseudo-fermionic coherent states are constructed as

eigenstates of two pseudo-fermion annihilation operators. These coherent states

form a bi-normal and bi-overcomplete system, and their evolution governed by

the pseudo-Hermitian Hamiltonian is temporally stable. In terms of the

introduced pseudo-fermion operators the two-level system' Hamiltonian takes a

factorized form similar to that of a harmonic oscillator.

\\ ( http://arXiv.org/abs/quant-ph/0608177 , 11kb)

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Paper: quant-ph/0608182

Date: Wed, 23 Aug 2006 18:15:27 GMT (269kb)

Title: Quantum phase gate and controlled entanglement with polar molecules

Authors: Eric Charron (PPM), P\'{e}rola Milman (PPM, CERMICS), Arne Keller

(PPM), Osman Atabek (PPM)

Proxy: ccsd ccsd-00089723

\\

We propose an alternative scenario for the generation of entanglement between

rotational quantum states of two polar molecules. This entanglement arises from

dipole-dipole interaction, and is controlled by a sequence of laser pulses

simultaneously exciting both molecules. We study the efficiency of the process,

and discuss possible experimental implementations with cold molecules trapped

in optical lattices or in solid matrices. Finally, various entanglement

detection procedures are presented, and their suitability for these two

physical situations is analyzed.

\\ ( http://arXiv.org/abs/quant-ph/0608182 , 269kb)

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Paper: quant-ph/0608002

replaced with revised version Wed, 23 Aug 2006 12:03:03 GMT (11kb)

Title: Relation between quantum tunneling times for bosons

Authors: C.A. Bonin, J.T. Lunardi, L.A. Manzoni, and B.M. Pimentel

Comments: 4 pages, no figures. It was added the new reference [6] and a

corresponding note in the Introduction. To appear in Phys. Rev. A - Brief

Reports

\\ ( http://arXiv.org/abs/quant-ph/0608002 , 11kb)

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Paper: cond-mat/0608522

Date: Thu, 24 Aug 2006 02:32:00 GMT (720kb)

Title: Thermodynamics of quantum degenerate gases in optical lattices

Authors: P. B. Blakie, A.-M. Rey, and A. Bezett

Comments: 6 pages, 4 figures. Submitted to proceedings of Laser Physics 2006

Workshop

Subj-class: Statistical Mechanics

\\

The entropy-temperature curves are calculated for non-interacting Bose and

Fermi gases in a 3D optical lattice. These curves facilitate understanding of

how adiabatic changes in the lattice depth affect the temperature, and we

demonstrate regimes where the atomic sample can be significantly heated or

cooled by the loading process. We assess the effects of interactions on a Bose

gas in a deep optical lattice, and show that interactions ultimately limit the

extent of cooling that can occur during lattice loading.

\\ ( http://arXiv.org/abs/cond-mat/0608522 , 720kb)

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Paper: cond-mat/0608532

Date: Thu, 24 Aug 2006 11:24:19 GMT (197kb)

Title: Dynamical stability of a doubly quantized vortex in a three-dimensional

condensate

Authors: Emil Lundh, Halvor M. Nilsen

Comments: 23 pages, 11 figures

Subj-class: Other

\\

The Bogoliubov equations are solved for a three-dimensional Bose-Einstein

condensate containing a doubly quantized vortex, trapped in a harmonic

potential. Complex frequencies, signifying dynamical instability, are found for

certain ranges of parameter values. The existence of alternating windows of

stability and instability, respectively, is explained qualitatively and

quantitatively using variational calculus and direct numerical solution. It is

seen that the windows of stability are much smaller for a cigar shaped

condensate than for a pancake shaped one, which is consistent with the findings

of recent experiments.

\\ ( http://arXiv.org/abs/cond-mat/0608532 , 197kb)

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Paper: cond-mat/0608542

Date: Thu, 24 Aug 2006 19:48:57 GMT (159kb)

Title: Three-body recombination in a cesium gas at ultralow temperatures

Authors: M.T. Yamashita, T. Frederico and Lauro Tomio

Subj-class: Soft Condensed Matter

\\

We calculate the three-body recombination length of cesium atoms to deeply

bound molecules up to 500 nK. We include the effects of triatomic continuum

resonances for large negative scattering lengths ($a$) and positive energies

generalizing the recombination rate equation for finite temperatures. We

calculate the position and width of the continuum resonances near the Feshbach

resonance for the experimental setup [T. Kraemer et al., Nature {\bf 440}, 315

(2006)]. Our results give a good quantitative description of the experimental

recombination length as a function of $a$ and the trap temperature, $T$, with

no new free parameters. The increase of $T$ moves the resonance peak of the

three-body recombination rate to lower values of $|a|$ exhibiting a saturation

behavior, this result is consistent with the experimental data.

\\ ( http://arXiv.org/abs/cond-mat/0608542 , 159kb)

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Paper: cond-mat/0603639

replaced with revised version Thu, 24 Aug 2006 04:27:19 GMT (11kb)

Title: Resonance reactions and enhancement of weak interactions in collisions

of cold molecules

Authors: V.V. Flambaum, J.S.M. Ginges

Comments: 5 pages. Included discussion of expected size of effects

Subj-class: Other; Chemical Physics; Atomic Physics

Journal-ref: Phys. Rev. A 74 (2006) 025601

\\ ( http://arXiv.org/abs/cond-mat/0603639 , 11kb)

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Paper: quant-ph/0601137

replaced with revised version Thu, 24 Aug 2006 07:43:20 GMT (466kb)

Title: Theoretical study of a cold atom beam splitter

Authors: Naceur Gaaloul (PPM, LSAMA), Annick Suzor-Weiner (PPM), Laurence

Pruvost (LAC), Mourad Telmini (LSAMA), Eric Charron (PPM)

Proxy: ccsd ccsd-00017414

\\ ( http://arXiv.org/abs/quant-ph/0601137 , 466kb)

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Paper: physics/0608233

Date: Thu, 24 Aug 2006 13:37:17 GMT (68kb)

Title: Cooling and trapping of ultra-cold strontium isotopic mixtures

Authors: N. Poli, R. E. Drullinger, G. Ferrari, J. Leonard, F. Sorrentino, and

G. M. Tino

Subj-class: Atomic Physics

Journal-ref: Phys. Rev. A 71, 061403(R) (2005)

DOI: 10.1103/PhysRevA.71.061403

\\

We present the simultaneous cooling and trapping of an isotopic mixture in a

magneto-optical trap and we describe the transfer of the mixture into a

conservative, far-off resonant dipole trap. The mixture is prepared with a new

technique that applies to intermediate and heavy alkaline earth like atoms. In

this work, 88Sr and 86Sr are simultaneously loaded first into the

magneto-optical trap operated on the 1S0-3P1 spin-forbidden line at 689 nm, and

then transferred into the dipole trap. We observe fast inter-species

thermalization in the dipole trap which allows one to set a lower bound on the

88Sr-86Sr elastic cross section.

\\ ( http://arXiv.org/abs/physics/0608233 , 68kb)

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Paper: physics/0608235

Date: Thu, 24 Aug 2006 15:18:12 GMT (252kb)

Title: Is it possible to observe experimentally a metal-insulator transition in

ultra cold atoms?

Authors: Antonio M. Garcia-Garcia, Jiao Wang

Comments: 7 pages, 3 figures

Subj-class: Atomic Physics

\\

Kicked rotors with certain non-analytic potentials avoid dynamical

localization and undergo a metal-insulator transition. We show that typical

properties of this transition are still present as the non-analyticity is

progressively smoothed out provided that the smoothing is less than a certain

limiting value. We have identified a smoothing dependent time scale such that

full dynamical localization is absent and the quantum momentum distribution

develops power-law tails with anomalous decay exponents as in the case of a

conductor at the metal-insulator transition. We discuss under what conditions

these findings may be verified experimentally by using ultra cold atoms

techniques. It is found that ultra-cold atoms can indeed be utilized for the

experimental investigation of the metal-insulator transition.

\\ ( http://arXiv.org/abs/physics/0608235 , 252kb)

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Paper: physics/0604082

replaced with revised version Tue, 22 Aug 2006 23:33:31 GMT (231kb)

Title: Atom interferometer as a selective sensor of rotation or gravity

Authors: B. Dubetsky and M. A. Kasevich

Comments: 21 pages, 4 figures, extended references, discussion, and motivation

Subj-class: Atomic Physics

Journal-ref: Phys. Rev. A 74, 023615 (2006)

\\ ( http://arXiv.org/abs/physics/0604082 , 231kb)

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Paper: cond-mat/0608553

Date: Fri, 25 Aug 2006 09:07:40 GMT (103kb)

Title: Ultracold atomic quantum gases far from equilibrium

Authors: T. Gasenzer, J. Berges, M.G. Schmidt, and M. Seco

Comments: 4 pages, SEWM06 proceedings

Subj-class: Other

\\

We calculate the time evolution of a far-from-equilibrium initial state of a

non-relativistic ultracold Bose gas in one spatial dimension. The

non-perturbative approximation scheme is based on a systematic expansion of the

two-particle irreducible effective action in powers of the inverse number of

field components. This yields dynamic equations which contain direct

scattering, memory and off-shell effects that are not captured in mean-field

theory.

\\ ( http://arXiv.org/abs/cond-mat/0608553 , 103kb)

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\\

Paper: cond-mat/0608566

Date: Fri, 25 Aug 2006 18:01:43 GMT (653kb)

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: 11 pages, 3 figures

Subj-class: Strongly Correlated Electrons; Superconductivity

\\

Field-induced transitions in quantum magnets can often be interpreted in

terms of Bose-Eistein condensation (BEC) of magnons. Such transitions are fully

equivalent to BEC of atoms in liquid He, laser-cooled gasses in magnetic traps,

or Cooper pairs in superconductors. An interesting conundrum is presented by

BEC of magnons in weakly interacting gapped quantum spin chains or ladders.

Here the disordered ``spin liquid'' normal state is a unique property of

1-dimensional (1D) topology. In contrast, the stability of the magnon

condensate at high fields is necessarily a 3D effect, and relies on residual

inter-chain interactions. The phenomenon is therefore one of the more striking

examples of dimensional crossover in many-body quantum mechanics. Do the

topology and one-dimensionality of the normal state influence in the properties

of the condensate? Below we answer this question experimentally, through a

study of field-induced BEC and relevant collective excitations in a

prototypical spin ladder material.

\\ ( http://arXiv.org/abs/cond-mat/0608566 , 653kb)

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\\

Paper: cond-mat/0603030

replaced with revised version Thu, 24 Aug 2006 21:44:38 GMT (24kb)

Title: The Mott insulator phase of the one dimensional Bose-Hubbard model: a

high order perturbative study

Authors: Bogdan Damski and Jakub Zakrzewski

Comments: 7 pages, 4 figures, 1 table. Significantly expanded version with

respect to former submission (to appear in Phys. Rev. A)

Report-no: LAUR-06-1357

Subj-class: Other

\\ ( http://arXiv.org/abs/cond-mat/0603030 , 24kb)

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\\

Paper: quant-ph/0608197

Date: Fri, 25 Aug 2006 09:05:11 GMT (40kb)

Title: Matrix Product State Representations

Authors: D. Perez-Garcia, F. Verstraete, M.M. Wolf, J.I. Cirac

\\

This work gives a detailed investigation of matrix product state (MPS)

representations for multipartite quantum states. We determine the freedom in

representations with and without translation symmetry, derive respective

canonical forms and provide efficient methods for obtaining them. Results on

frustration free Hamiltonians and the generation of MPS are extended, and the

use of the MPS-representation for classical simulations of quantum systems is

discussed.

\\ ( http://arXiv.org/abs/quant-ph/0608197 , 40kb)

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\\

Paper: physics/0603145

replaced with revised version Fri, 25 Aug 2006 16:55:47 GMT (473kb)

Title: Slow Light Propagation in a Linear-Response Three-Level Atomic Vapor

Authors: Wenhai Ji, Chunbai Wu and M. G. Raymer

Comments: 21 pages, 8 figures. submitted to JOSAB

Subj-class: Optics

\\ ( http://arXiv.org/abs/physics/0603145 , 473kb)

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\\

Paper: cond-mat/0608571

Date: Fri, 25 Aug 2006 21:02:24 GMT (251kb)

Title: Bosonic molecules in rotating traps

Authors: Igor Romanovsky, Constantine Yannouleas, Leslie O. Baksmaty, Uzi

Landman

Comments: To appear in Phys. Rev. Lett. LATEX, 5 pages with 5 figures. For

related papers, see http://www.prism.gatech.edu/~ph274cy/

Subj-class: Soft Condensed Matter; Mesoscopic Systems and Quantum Hall Effect

\\

We present a variational many-body wave function for repelling bosons in

rotating traps, focusing on rotational frequencies that do not lead to

restriction to the lowest Landau level. This wave function incorporates

correlations beyond the Gross-Pitaevskii (GP) mean field approximation, and it

describes rotating boson molecules (RBMs) made of localized bosons that form

polygonal-ring-like crystalline patterns in their intrinsic frame of reference.

The RBMs exhibit characteristic periodic dependencies of the ground-state

angular momenta on the number of bosons in the polygonal rings. For small

numbers of neutral bosons, the RBM ground-state energies are found to be always

lower than those of the corresponding GP solutions, in particular in the regime

of GP vortex formation.

\\ ( http://arXiv.org/abs/cond-mat/0608571 , 251kb)

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\\

Paper: cond-mat/0608585

Date: Sun, 27 Aug 2006 00:01:35 GMT (936kb)

Title: Long Phase Coherence Time and Number Squeezing of two Bose-Einstein

Condensates on an Atom Chip

Authors: G.-B. Jo, Y. Shin, S. Will, T. A. Pasquini, M. Saba, W. Ketterle, D.

E. Pritchard, M. Vengalattore, and M. Prentiss

Subj-class: Other

\\

We measured the relative phase of two Bose-Einstein condensates confined in

an radio frequency induced double well potential on an atom chip. We observed

phase coherence between the separated condensates for times up to 200 ms after

splitting, a factor of 10 beyond the phase diffusion limit expected for a

coherent state in our experimental conditions (20 ms). The enhanced coherence

time is attributed to number squeezing of the initial state by a factor of 10.

In addition, we demonstrated a rotationally sensitive (Sagnac) geometry for a

guided atom interferometer by propagating the split condensates.

\\ ( http://arXiv.org/abs/cond-mat/0608585 , 936kb)

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\\

Paper: cond-mat/0608602

Date: Mon, 28 Aug 2006 14:16:25 GMT (8kb)

Title: The Bose Gas Low Momentum Limit Revisited

Authors: H. Perez Rojas and D. Oliva

Comments: 5 pages, RevTex 4

Subj-class: Statistical Mechanics; Superconductivity

\\

We discuss the standard approach to the problem of the low momentum limit of

the spectrum for a weakly interacting Bose gas. The Bogoliubov's spectrum is

shown to be obtained as a Goldstone mode thanks to the introduction of a

chemical potential $\mu$. This procedure has, however, difficulties since the

breaking of the gauge symmetry implies that the corresponding chemical

potential must be taken as zero, unless it is introduced before breaking the

symmetry. But if this is done, after the symmetry breaking $\mu$ loses its

meaning as a chemical potential. An alternative two-mode solution is suggested

having two modes, one of them being the free-particle quadratic in momentum

spectrum, the second bearing a gap. This gap leads to a $\lambda$-type behavior

of the specific heat near the critical temperature.

\\ ( http://arXiv.org/abs/cond-mat/0608602 , 8kb)

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\\

Paper: cond-mat/0506766

replaced with revised version Mon, 28 Aug 2006 10:06:14 GMT (234kb)

Title: Quantum lattice solitons in ultracold bosons near Feshbach resonance

Authors: K.V.Krutitsky and D.V.Skryabin

Subj-class: Other

Journal-ref: J. Phys. B 39, 3507-3517 (2006)

DOI: 10.1088/0953-4075/39/17/008

\\ ( http://arXiv.org/abs/cond-mat/0506766 , 234kb)

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\\

Paper: cond-mat/0604572

replaced with revised version Mon, 28 Aug 2006 09:24:39 GMT (80kb)

Title: Resonant pairing between Fermions with unequal masses

Authors: S.-T. Wu, C.-H. Pao and S.-K. Yip

Comments: 10 pages, 4 figures

Subj-class: Superconductivity; Other

\\ ( http://arXiv.org/abs/cond-mat/0604572 , 80kb)

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\\

Paper: cond-mat/0605335

replaced with revised version Mon, 28 Aug 2006 07:58:02 GMT (214kb)

Title: Ultracold polarized Fermi gas at intermediate temperatures

Authors: Jani-Petri Martikainen

Comments: Final published version

Subj-class: Statistical Mechanics

Journal-ref: Phys. Rev. A 74, 013602 (2006)

\\ ( http://arXiv.org/abs/cond-mat/0605335 , 214kb)

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\\

Paper: cond-mat/0606697

replaced with revised version Mon, 28 Aug 2006 05:23:11 GMT (331kb)

Title: Fermionic atoms trapped in one-dimensional optical superlattice with

harmonic confinement

Authors: Takanori Yamashita, Norio Kawakami, Makoto Yamashita

Comments: 8 pages, 9 figures, revised version, figures rearranged

Subj-class: Statistical Mechanics

\\ ( http://arXiv.org/abs/cond-mat/0606697 , 331kb)

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\\

Paper: quant-ph/0608210

Date: Mon, 28 Aug 2006 08:32:01 GMT (260kb)

Title: Multi-dark-state resonances in cold multi-Zeeman-sublevel atoms

Authors: Bo Wang, Yanxu Han, Jintao Xiao, Xudong Yang, Changde Xie, Hai Wang,

Min Xiao

Comments: 11pages, 4figures

\\

We present our experimental and theoretical studies of multi-dark-state

resonances (MDSRs) generated in a unique cold rubidium atomic system with only

one coupling laser beam. Such MDSRs are caused by different transition

strengths of the strong coupling beam connecting different Zeeman sublevels.

Controlling the transparency windows in such electromagnetically induced

transparency system can have potential applications in multi-wavelength optical

communication and quantum information processing.

\\ ( http://arXiv.org/abs/quant-ph/0608210 , 260kb)

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\\

Paper: quant-ph/0608214

Date: Mon, 28 Aug 2006 12:33:59 GMT (110kb)

Title: Quantum sensitivity limit of a Sagnac hybrid interferometer based on

slow-light propagation in ultra-cold gases

Authors: F. E. Zimmer, M. Fleischhauer

Comments: 12 pages, 6 figures

\\

The light--matter-wave Sagnac interferometer based on ultra-slow light

proposed recently in (Phys. Rev. Lett. 92, 253201 (2004)) is analyzed in

detail. In particular the effect of confining potentials is examined and it is

shown that the ultra-slow light attains a rotational phase shift equivalent to

that of a matter wave, if and only if the coherence transfer from light to

atoms associated with slow light is associated with a momentum transfer and if

an ultra-cold gas in a ring trap is used. The quantum sensitivity limit of the

Sagnac interferometer is determined and the minimum detectable rotation rate

calculated. It is shown that the slow-light interferometer allows for a

significantly higher signal-to-noise ratio as possible in current matter-wave

gyroscopes.

\\ ( http://arXiv.org/abs/quant-ph/0608214 , 110kb)

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\\

Paper: quant-ph/0508135

replaced with revised version Mon, 28 Aug 2006 16:54:32 GMT (36kb)

Title: Superradiance in ultracold Rydberg gases

Authors: Tun Wang, S. F. Yelin, R. Cote, E. E. Eyler, S. M. Farooqi, P. L.

Gould, M. Kostrun, D. Tong, D. Vrinceanu

Comments: 4 pages, 4 figures

\\ ( http://arXiv.org/abs/quant-ph/0508135 , 36kb)

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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/ ========================================================================= 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 Aug 30 2006 - 10:37:44 EST

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