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

Date: Mon, 11 Dec 2006 15:05:16 +1000 (EST)

Date: Mon, 11 Dec 2006 15:05:16 +1000 (EST)

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

New preprints:

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Paper: cond-mat/0612009

Date: Fri, 1 Dec 2006 00:32:54 GMT (217kb)

Title: Supersolids and Solids to Supersolids transitions in frustrated lattices

Authors: Jinwu Ye

Comments: 6 pages, Revtex, 3 figures. For previous work on bipartite lattices

see cond-mat/0503113

Subj-class: Strongly Correlated Electrons; Materials Science

\\

We studied all the possible phases and phase transitions in an extended boson

Hubbard model slightly away from $ 1/3 $ ($ 2/3 $) filling on frustrated

lattices such as triangular and kagome lattice. We find that in the insulating

side, different kinds of supersolids are generic stable states slightly away

from $ 1/3 $ ($ 2/3 $) filling. We propose a new kind of supersolid: charge

density wave-valence bond supersolid in kagome lattice. We show that the

quantum phase transitions from solids to supersolids driven by a chemical

potential are in the same universality class as that from a Mott insulator to a

superfluid, therefore have exact exponents $ z=2, \nu=1/2, \eta=0 $ (with

logarithmic corrections). Comparisons with previous quantum Monte-Carlo (QMC)

simulations on some microscopic models on triangular and Kagome lattices are

made. Implications on possible future QMC simulations with both nearest

neighbor and next nearest neighbor interactions in both lattices are given. The

results achieved in this paper on frustrated lattices and those achieved in the

previous paper (cond-mat/0503113) on bipartite lattices provide a unified and

simple picture to describe supersolids on any lattices at any filling factors

with any kinds of lattice symmetry breaking patterns. They should have direct

impacts on ultra-cold atoms on optical lattices and may also shed some lights

on microscopic origins and phenomenological theory of possible $ ^{4} He $

supersolid.

\\ ( http://arXiv.org/abs/cond-mat/0612009 , 217kb)

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Paper: cond-mat/0612011

Date: Fri, 1 Dec 2006 02:25:57 GMT (68kb)

Title: Distribution functions of interference contrast in low-dimensional Bose

gases

Authors: Adilet Imambekov, Vladimir Gritsev and Eugene Demler

Subj-class: Strongly Correlated Electrons; Statistical Mechanics

\\

We consider interference experiments with two independent low dimensional

Bose gases. Phase fluctuations result in both the reduced contrast of

interference fringes and shot to shot fluctuations of the interference

contrast. We show that the problem of finding the full distribution function of

fringe contrast can be mapped to the problem of the statistics of random

surfaces. We develop a general method for calculating full distribution

functions for low-dimensional Bose gases, and apply it to one and two

dimensional cases with nonzero temperature. We propose that distribution

functions of interference fringe visibilities can be used for thermometry.

\\ ( http://arXiv.org/abs/cond-mat/0612011 , 68kb)

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Paper: cond-mat/0612030

Date: Fri, 1 Dec 2006 13:09:45 GMT (28kb)

Title: Strongly correlated fermions after a quantum quench

Authors: S.R. Manmana, S. Wessel, R.M. Noack, and A. Muramatsu

Comments: 4 pages, 5 figures, submitted to Phys. Rev. Lett

Subj-class: Other; Strongly Correlated Electrons

\\

Using the adaptive time-dependent density-matrix renormalization group

method, we study the time evolution of strongly correlated spinless fermions on

a one-dimensional lattice after a sudden change of the interaction strength.

For certain parameter values, two different initial states (e.g., metallic and

insulating), lead to observables which become indistinguishable after

relaxation. We find that the resulting quasi-stationary state is non-thermal.

This result holds for both integrable and non-integrable variants of the

system.

\\ ( http://arXiv.org/abs/cond-mat/0612030 , 28kb)

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Paper: cond-mat/0612035

Date: Fri, 1 Dec 2006 18:39:26 GMT (423kb)

Title: Bose-Einstein condensation in the pseudogap phase of cuprate

superconductors

Authors: A. S. Alexandrov

Comments: 16 pages, 4 figures, invited paper at 5th International Conference

STRIPES06 (December 17-22 2006, Rome, Italy)

Subj-class: Superconductivity; Strongly Correlated Electrons

\\

We have identified the unscreened Froehlich electron-phonon interaction (EPI)

as the most essential for pairing in cuprate superconductors as now confirmed

by isotope substitution, recent angle-resolved photoemission (ARPES), and some

other experiments. Low-energy physics is that of mobile lattice polarons and

bipolarons in the strong EPI regime. Many experimental observations have been

predicted or explained in the framework of our "Coulomb-Froehlich" model, which

fully takes into account the long-range Coulomb repulsion and the Froehlich

EPI. They include pseudo-gaps, unusual isotope effects and upper critical

fields, the normal state Nernst effect, diamagnetism, the Hall-Lorenz numbers,

and a giant proximity effect (GPE). These experiments along with the

parameter-free estimates of the Fermi energy and the critical temperature

support a genuine Bose-Einstein condensation of real-space lattice bipolarons

in the pseudogap phase of cuprates. On the contrary the phase fluctuation (or

vortex) scenario is incompatible with the insulating-like in-plane resistivity

and the magnetic-field dependence of orbital magnetization in the resistive

state of underdoped cuprates.

\\ ( http://arXiv.org/abs/cond-mat/0612035 , 423kb)

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Paper (*cross-listing*): nucl-th/0611097

Date: Tue, 28 Nov 2006 09:40:11 GMT (149kb)

Title: Relativistic BCS-BEC crossover in a boson-fermion model

Authors: Jian Deng, Andreas Schmitt, Qun Wang

Comments: ReVTex 4, 13 pages, 7 figures

Subj-class: Nuclear Theory; Superconductivity

\\

We investigate the crossover from Bardeen-Cooper-Schrieffer (BCS) pairing to

a Bose-Einstein condensate (BEC) in a relativistic superfluid within a

boson-fermion model. The model includes, besides the fermions, separate bosonic

degrees of freedom, accounting for the bosonic nature of the Cooper pairs. The

crossover is realized by tuning the difference between the boson mass and boson

chemical potential as a free parameter. The model yields populations of

condensed and uncondensed bosons as well as gapped and ungapped fermions

throughout the crossover region for arbitrary temperatures. Moreover, we

observe the appearance of antiparticles for sufficiently large values of the

crossover parameter. The model can potentially be applied to color

superconductivity in dense quark matter at strong couplings.

\\ ( http://arXiv.org/abs/nucl-th/0611097 , 149kb)

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Paper: cond-mat/0612044

Date: Fri, 1 Dec 2006 21:01:08 GMT (35kb)

Title: Mott phases and superfluid-insulator transition of dipolar spin-three

bosons in an optical lattice: implications for Cr atoms

Authors: Jean-Sebastien Bernier, K. Sengupta, Yong Baek Kim

Comments: 10 pages, 12 figures

Subj-class: Strongly Correlated Electrons

\\

We study the Mott phases and superfluid-insulator transition of spin-three

bosons in an optical lattice with an anisotropic two dimensional optical trap.

We chart out the phase diagrams for Mott states with $n=1$ and $n=2$ atoms per

lattice site. It is shown that the long-range dipolar interaction stabilizes a

state where the chains of the ferromagnetically aligned spins run along the

longer trap direction while the spin ordering is staggered between nearby

chains, leading to an antiferromagnetic ordering along the shorter trap

direction. We also obtain the mean-field phase boundary for the

superfluid-insulator transition in these systems and study the nature of spin

ordering in the superfluid state near the transition. We show that, inside the

superfluid phase and near the superfluid-insulator phase boundary, the system

undergoes a first order antiferromagnetic-ferromagnetic spin ordering

transition. We discuss implications of our results for $^{52}$Cr atoms and

suggest possible experiments to detect different phases in such systems.

\\ ( http://arXiv.org/abs/cond-mat/0612044 , 35kb)

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Paper: quant-ph/0612026

Date: Mon, 4 Dec 2006 12:49:34 GMT (170kb)

Title: Cooling in a Bistable Optical Cavity

Authors: Mark Y. Vilensky, Yehiam Prior, and Ilya Sh. Averbukh

\\

We propose a generic approach to nonresonant laser cooling of atoms/molecules

in a bistable optical cavity. The method exemplifies a photonic version of

Sisyphus cooling, in which the matter-dressed cavity extracts energy from the

particles and discharges it to the external field as a result of sudden

transitions between two stable states.

\\ ( http://arXiv.org/abs/quant-ph/0612026 , 170kb)

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Paper: cond-mat/0612099

Date: Mon, 4 Dec 2006 23:25:43 GMT (3kb)

Title: Reply to comment by S.-K. Yip cond-mat/0611426

Authors: Ryan Barnett, Ari Turner, Eugene Demler

Subj-class: Strongly Correlated Electrons

\\

We respond to S.-K. Yip's criticism of our work on the classification of

spinor condensates. We explain why his criticism is unfounded, emphasizing that

the phases he mentions have been addressed in our paper cond-mat/0611230. To

provide a constructive aspect to this response, we use it as an opportunity to

show how our classification scheme makes explicit not only spin rotations which

leave spinor states invariant, but also the phase factors which need to

accompany them.

\\ ( http://arXiv.org/abs/cond-mat/0612099 , 3kb)

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Paper: cond-mat/0612100

Date: Mon, 4 Dec 2006 23:38:50 GMT (94kb)

Title: Quantum emulsion: a glassy phase of bosonic mixtures in optical lattices

Authors: Tommaso Roscilde, J. Ignacio Cirac

Comments: 4 pages, 3 figures

Subj-class: Strongly Correlated Electrons; Disordered Systems and Neural

Networks

\\

We numerically investigate mixtures of two interacting bosonic species with

unequal parameters in one-dimensional optical lattices. In large parameter

regions full phase segregation is seen to minimize the energy of the system,

but the true ground state is masked by an exponentially large number of

metastable states characterized by microscopic phase separation. The ensemble

of these quantum emulsion states, reminiscent of emulsions of immiscible

fluids, has macroscopic properties analogous to those of a Bose glass, namely a

finite compressibility in absence of superfluidity. Their metastability is

probed by extensive quantum Monte Carlo simulations generating a rich

correlated stochastic dynamics. The tuning of the repulsion of one of the two

species via a Feshbach resonance drives the system through a quantum phase

transition to the superfluid state.

\\ ( http://arXiv.org/abs/cond-mat/0612100 , 94kb)

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Paper: cond-mat/0612103

Date: Tue, 5 Dec 2006 05:05:21 GMT (88kb)

Title: Superfluid phase diagrams of trapped Fermi gases with population

imbalance

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

Comments: 4 pages, 4 figures, submitted to PRL

Subj-class: Strongly Correlated Electrons; Superconductivity

\\

We present phase diagrams for population imbalanced, trapped Fermi

superfluids near unitarity. In addition to providing quantitative values for

the superfluid transition temperature, the pairing onset temperature and the

transition line (separating the Sarma and phase separation regimes), we study

experimental signatures of these transitions based on density profiles and

density differences at the center. Predictions on the BCS side of resonance

show unexpected behavior, which should be searched for experimentally.

\\ ( http://arXiv.org/abs/cond-mat/0612103 , 88kb)

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Paper: cond-mat/0612104

Date: Tue, 5 Dec 2006 04:15:13 GMT (694kb)

Title: Multi-component gap solitons in spinor Bose-Einstein condensates

Authors: Beata J. Dabrowska-Wuester, Elena A. Ostrovskaya, Tristram J.

Alexander, Yuri S. Kivshar

Comments: 12 pages, 13 figures

Subj-class: Other

\\

We model the nonlinear behaviour of spin-1 Bose-Einstein condensates (BECs)

with repulsive spin-independent interactions and either ferromagnetic or

anti-ferromagnetic (polar) spin-dependent interactions, loaded into a

one-dimensional optical lattice potential. We show that both types of BECs

exhibit dynamical instabilities and may form spatially localized

multi-component structures. The localized states of the spinor matter waves

take the form of vector gap solitons and self-trapped waves that exist only

within gaps of the linear Bloch-wave band-gap spectrum. Of special interest are

the nonlinear localized states that do not exhibit a common spatial density

profile shared by all condensate components, and consequently cannot be

described by the single mode approximation (SMA), frequently employed within

the framework of the mean-field treatment. We show that the non-SMA states can

exhibits Josephson-like internal oscillations and self-magnetisation, i.e.

intrinsic precession of the local spin. Finally, we demonstrate that

non-stationary states of a spinor BEC in a lattice exhibit coherent undamped

spin-mixing dynamics, and that their controlled conversion into a stationary

state can be achieved by the application of an external magnetic field.

\\ ( http://arXiv.org/abs/cond-mat/0612104 , 694kb)

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Paper: cond-mat/0612114

Date: Tue, 5 Dec 2006 12:37:00 GMT (342kb)

Title: Bogoliubov-Cerenkov radiation in a Bose-Einstein condensate flowing

against an obstacle

Authors: I. Carusotto, S. X. Hu, L. A. Collins, A. Smerzi

Subj-class: Other

\\

We study the density modulation that appears in a Bose-Einstein condensate

flowing with supersonic velocity against an obstacle. The experimental density

profiles observed at JILA are reproduced by a numerical integration of the

Gross-Pitaevskii equation and then interpreted in terms of Cerenkov emission of

Bogoliubov excitations by the defect. The phonon and the single-particle

regions of the Bogoliubov spectrum are respectively responsible for a conical

wavefront and a fan-shaped series of precursors.

\\ ( http://arXiv.org/abs/cond-mat/0612114 , 342kb)

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Paper: cond-mat/0612123

Date: Tue, 5 Dec 2006 17:28:43 GMT (144kb)

Title: Efimov Physics in Cold Atoms

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

Comments: 57 pages, 13 figures, to appear in Annals of Physics

Report-no: HISKP-TH-06-34

Subj-class: Other

\\

Atoms with a large scattering length have universal low-energy properties

that do not depend on the details of their structure or their interactions at

short distances. In the 2-atom sector, the universal properties are familiar

and depend only on the scattering length. In the 3-atom sector for identical

bosons, the universal properties include the existence of a sequence of shallow

triatomic molecules called Efimov trimers and log-periodic dependence of

scattering observables on the energy and the scattering length. In this review,

we summarize the universal results that are currently known. We also summarize

the experimental information that is currently available with an emphasis on

3-atom loss processes.

\\ ( http://arXiv.org/abs/cond-mat/0612123 , 144kb)

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Paper: cond-mat/0612125

Date: Tue, 5 Dec 2006 18:03:25 GMT (58kb)

Title: Few-Body Effects in Cold Atoms and Limit Cycles

Authors: H.-W. Hammer (Bonn U.)

Comments: 7 pages, 3 figures, plenary talk at the 18th International IUPAP

Conference on Few-Body Problems in Physics (FB18), Santos, Brazil, August

2006

Report-no: HISKP-TH-06-33

Subj-class: Other

\\

Physical systems with a large scattering length have universal properties

independent of the details of the interaction at short distances. Such systems

can be realized in experiments with cold atoms close to a Feshbach resonance.

They also occur in many other areas of physics such as nuclear and particle

physics. The universal properties include a geometric spectrum of three-body

bound states (so-called Efimov states) and log-periodic dependence of

low-energy observables on the physical parameters of the system. This behavior

is characteristic of a renormalization group limit cycle. We discuss

universality in the three- and four-body sectors and give an overview of

applications in cold atoms.

\\ ( http://arXiv.org/abs/cond-mat/0612125 , 58kb)

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Paper: quant-ph/0612039

Date: Tue, 5 Dec 2006 20:46:33 GMT (16kb)

Title: Oscillation dynamics of multi-well condensates

Authors: S. Mossmann and C. Jung

Comments: 5 pages, 5 figures

\\

We propose a new approach to the macroscopic dynamics of three-well

Bose-Einstein condensates, giving particular emphasis to self-trapping and

Josephson oscillations. Although these effects have been studied quite

thoroughly in the mean-field approximation, a full quantum description is

desirable, since it avoids pathologies due to the nonlinear character of the

mean-field equations. Using superpositions of quantum eigenstates, we construct

various oscillation and trapping scenarios.

\\ ( http://arXiv.org/abs/quant-ph/0612039 , 16kb)

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Paper: cond-mat/0612132

Date: Wed, 6 Dec 2006 02:04:38 GMT (686kb)

Title: Interaction-induced interference for two independent Bose-Einstein

condensates

Authors: Hongwei Xiong, Shujuan Liu, Mingsheng Zhan

Subj-class: Statistical Mechanics

Journal-ref: New Journal of Physics 8, 245 (2006)

\\

After removing the double-well potential trapping two initially independent

Bose condensates, the density expectation value is calculated when both the

exchange symmetry of identical bosons and interatomic interaction are

considered. The density expectation value and evolution equations are obtained

based on both the first-quantization and second-quantization methods. When the

interatomic interaction is considered carefully, after the overlapping of two

initially independent condensates, it is shown that there is a nonzero

interference term in the density expectation value. It is found that the

calculated density expectation value with this model agrees with the

interference pattern observed in the experiment by Andrews (Science 275, 637

(1997)). The nonzero interference term in the density expectation value

physically arises from the exchange symmetry of identical bosons and

interatomic interaction which make two initially independent condensates become

coherent after the overlapping. For two initially independent condensates, our

researches show that there is an interaction-induced coherence process.

\\ ( http://arXiv.org/abs/cond-mat/0612132 , 686kb)

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Paper: cond-mat/0612133

Date: Wed, 6 Dec 2006 02:36:38 GMT (292kb)

Title: Density-density correlation and interference mechanism for two initially

independent Bose-Einstein condensates

Authors: Shujuan Liu, Hongwei Xiong

Comments: See also cond-mat/0612132 (or New Journal of Physics 8, 245 (2006))

Subj-class: Statistical Mechanics

\\

In an exciting experiment by MIT's group (Science 275, 637 (1997)), clear

interference fringes were observed for two initially independent Bose

condensates in dilute gas. Presently, there are two different theories

(measurement-induced interference theory and interaction-induced interference

theory) which can both explain the MIT's experiment. In this paper, through the

comparison between different theories and discussion about the role of

two-particle correlation, the density-density correlation is suggested to test

different theories in future experiments.

\\ ( http://arXiv.org/abs/cond-mat/0612133 , 292kb)

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Paper: cond-mat/0612137

Date: Wed, 6 Dec 2006 07:31:51 GMT (23kb)

Title: Dynamics of quantum dissipation systems interacting with Fermion and

Boson grand canonical bath ensembles: Path integral versus equations of

motion formalism

Authors: Jinshuang Jin, Sven Welack, JunYan Luo, Xin-Qi Li, Ping Cui, Rui-Xue

Xu, and YiJing Yan

Comments: 12pages

Subj-class: Statistical Mechanics

\\

An exact hierarchical equations of motion formalism for a quantum dissipation

system in a grand canonical bath ensemble surrounding is constructed, on the

basis of the calculus-on-path-integral algorithm, together with the

parametrization of arbitrary non-Markovin bath that satisfies

fluctuation-dissipation theorem. The influence functionals for both the Fermion

or Boson bath interaction are found to be of the same path-integral expression

as the canonical bath, assuming they all satisfy the Gaussian statistics.

However, the equation of motion formalism are different, due to the

fluctuation-dissipation theories that are distinct and used explicitly. The

implications of the present work to quantum transport through molecular wires

and electron transfer in complex molecular systems are discussed.

\\ ( http://arXiv.org/abs/cond-mat/0612137 , 23kb)

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Paper: cond-mat/0612138

Date: Wed, 6 Dec 2006 08:42:47 GMT (20kb)

Title: Class of exactly soluble models of one-dimensional spinless fermions and

its application to the Tomonaga-Luttinger Hamiltonian with nonlinear

dispersion

Authors: A.V. Rozhkov

Comments: 12 pages, 0 figure, revtex 4

Subj-class: Strongly Correlated Electrons

\\

It is shown that for some special values of Hamiltonian parameters the

Tomonaga-Luttinger model with nonlinear dispersion is unitary equivalent to the

system of noninteracting fermions. For such parameter values the

density-density propagator of the Tomonaga-Luttinger Hamiltonian with nonlinear

dispersion can be found exactly. In a generic situation the exact solution can

be used as a reference point around which a perturbative expansion in orders of

certain irrelevant operators may be constructed.

\\ ( http://arXiv.org/abs/cond-mat/0612138 , 20kb)

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Paper: cond-mat/0612148

Date: Wed, 6 Dec 2006 14:09:01 GMT (343kb)

Title: A Mott-like State of Molecules

Authors: S. D\"urr, T. Volz, N. Syassen, D. M. Bauer, E. Hansis, G. Rempe

Comments: Proceedings of the 20th International Conference on Atomic Physics

(ICAP 2006), edited by C. Roos, H. Haffner, and R. Blatt, AIP Conference

Proceedings, Melville, 2006, Vol. 869, pp. 278-283

Subj-class: Statistical Mechanics

DOI: 10.1063/1.2400658

\\

We prepare a quantum state where each site of an optical lattice is occupied

by exactly one molecule. This is the same quantum state as in a Mott insulator

of molecules in the limit of negligible tunneling. Unlike previous Mott

insulators, our system consists of molecules which can collide inelastically.

In the absence of the optical lattice these collisions would lead to fast loss

of the molecules from the sample. To prepare the state, we start from a Mott

insulator of atomic 87Rb with a central region, where each lattice site is

occupied by exactly two atoms. We then associate molecules using a Feshbach

resonance. Remaining atoms can be removed using blast light. Our method does

not rely on the molecule-molecule interaction properties and is therefore

applicable to many systems.

\\ ( http://arXiv.org/abs/cond-mat/0612148 , 343kb)

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Paper: physics/0612052

Date: Tue, 5 Dec 2006 23:59:43 GMT (913kb)

Title: Fractal templates in the escape dynamics of trapped ultracold atoms

Authors: Kevin A. Mitchell, Daniel A. Steck

Comments: 11 pages with 5 figures

Subj-class: Atomic Physics

\\

We consider the dynamic escape of a small packet of ultracold atoms launched

from within an optical dipole trap. Based on a theoretical analysis of the

underlying nonlinear dynamics, we predict that fractal behavior can be seen in

the escape data. This data would be collected by measuring the time-dependent

escape rate for packets launched over a range of angles. This fractal pattern

is particularly well resolved below the Bose-Einstein transition temperature--a

direct result of the extreme phase space localization of the condensate. We

predict that several self-similar layers of this novel fractal should be

measurable and we explain how this fractal pattern can be predicted and

analyzed with recently developed techniques in symbolic dynamics.

\\ ( http://arXiv.org/abs/physics/0612052 , 913kb)

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Paper: cond-mat/0612170

Date: Wed, 6 Dec 2006 21:02:39 GMT (34kb)

Title: Cold atoms in real-space optical lattices

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

Comments: 27 pages, 4 figures

Subj-class: Other

\\

Cold atoms in optical lattices are described in {\it real space} by

multi-orbital mean-field Ans\"atze. In this work we consider four typical

systems: (i) spinless identical bosons, (ii) spinor identical bosons (iii),

Bose-Bose mixtures, and (iv) Bose-Fermi mixtures and derive in each case the

corresponding multi-orbital mean-field energy-functional and working equations.

The notions of {\it dressed} Wannier functions and Wannier spinors are

introduced and the equations defining them are presented and discussed. The

dressed Wannier functions are the set of orthogonal, translationally-equivalent

orbitals which minimizes the energy of the Hamiltonian including boson-boson

(particle-particle) interactions. Illustrative examples of dressed Wannier

functions are provided for spinless bosonic atoms and mixtures in

one-dimensional optical lattices.

\\ ( http://arXiv.org/abs/cond-mat/0612170 , 34kb)

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Paper: cond-mat/0612174

Date: Thu, 7 Dec 2006 02:29:18 GMT (331kb)

Title: Phase-locking transition of coupled low-dimensional superfluids

Authors: L. Mathey, A. Polkovnikov, and A.H. Castro Neto

Comments: 5 pages, 3 figures

Subj-class: Other

\\

We study the phase-locking transition of two coupled low-dimensional

superfluids, either two-dimensional superfluids at finite temperature, or

one-dimensional superfluids at zero temperature. We find that the superfluids

have a strong tendency to phase-lock. The phase-locking is accompanied by a

sizeable increase of the transition temperature ($T_{KT}$ in 2D) of the

resulting double-layer superfluid, which suggests a plausible way of observing

the Kibble-Zurek mechanism in two-dimensional cold atom systems by rapidly

varying the tunneling rate between the superfluids. If there is also

interaction between atoms in different layers we find additional phases

characterized by order or quasi long range order either in the symmetric or the

antisymmetric sector.

\\ ( http://arXiv.org/abs/cond-mat/0612174 , 331kb)

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Paper: cond-mat/0612176

Date: Thu, 7 Dec 2006 07:31:03 GMT (7kb)

Title: A heuristic approach to the weakly interacting Bose gas

Authors: Thomas Nattermann

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

\\

Some thermodynamic properties of weakly interacting Bose systems are derived

from dimensional and heuristic arguments and thermodynamic relations, without

resorting to statistical mechanics.

\\ ( http://arXiv.org/abs/cond-mat/0612176 , 7kb)

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Paper: cond-mat/0612191

Date: Thu, 7 Dec 2006 15:30:00 GMT (176kb)

Title: Spinor condensates with a laser-induced quadratic Zeeman effect

Authors: L. Santos, M. Fattori, J. Stuhler and T. Pfau

Comments: 4 pages, 2 eps figures

Subj-class: Other

\\

We show that an effective quadratic Zeeman effect can be generated in

$^{52}$Cr by proper laser configurations, and in particular by the dipole trap

itself. The induced quadratic Zeeman effect leads to a rich ground-state phase

diagram, can be used to induce topological defects by controllably quenching

across transitions between phases of different symmetries, allows for the

observability of the Einstein-de Haas effect for relatively large magnetic

fields, and may be employed to create $S=1/2$ systems with spinor dynamics.

Similar ideas could be explored in other atomic species opening an exciting new

control tool in spinor systems.

\\ ( http://arXiv.org/abs/cond-mat/0612191 , 176kb)

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Paper: cond-mat/0612192

Date: Thu, 7 Dec 2006 15:50:48 GMT (59kb)

Title: Correlation functions of the one-dimensional attractive Bose gas

Authors: P. Calabrese and J.-S. Caux

Comments: 4 pages, 2 figures

Subj-class: Statistical Mechanics; Strongly Correlated Electrons

\\

The zero-temperature correlation functions of the one-dimensional attractive

Bose gas with delta-function interaction are calculated analytically for any

value of the interaction parameter and number of particles, directly from the

integrability of the model. We point out a number of interesting features,

including zero recoil energy for large number of particles, analogous to a

M\"ossbauer effect.

\\ ( http://arXiv.org/abs/cond-mat/0612192 , 59kb)

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Paper: quant-ph/0612055

Date: Thu, 7 Dec 2006 12:44:27 GMT (154kb)

Title: An atom-photon pair laser

Authors: Thomas Salzburger, Helmut Ritsch

Comments: 10 pages, 4 figures

\\

We study the quantum dynamics of an ultracold atomic gas in a deep optical

lattice within an optical high-$Q$ resonator. The atoms are coherently

illuminated with the cavity resonance tuned to a blue vibrational sideband, so

that photon scattering to the resonator mode is accompanied by vibrational

cooling of the atoms. This system exhibits a threshold above which pairwise

stimulated generation of a cavity photon and an atom in the lowest vibrational

band dominates spontaneous scattering and we find a combination of optical

lasing with a buildup of a macroscopic population in the lowest lattice band.

Including output coupling of ground-state atoms and replenishing of hot atoms

into the cavity volume leads to a coherent, quantum correlated atom-photon pair

source very analogous to twin light beam generation in a nondegenerate optical

parametric oscillator.

\\ ( http://arXiv.org/abs/quant-ph/0612055 , 154kb)

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Paper: physics/0612071

Date: Thu, 7 Dec 2006 16:09:46 GMT (265kb)

Title: Coherent Control of Ultracold Collisions with Chirped Light: Direction

Matters

Authors: M.J. Wright, J.A. Pechkis, J.L. Carini, S. Kallush, R. Kosloff, and

P.L. Gould

Subj-class: Atomic Physics

\\

We demonstrate the ability to coherently control ultracold atomic Rb

collisions using frequency-chirped light on the nanosecond time scale. For

certain center frequencies of the chirp, the rate of inelastic trap-loss

collisions induced by negatively chirped light is dramatically suppressed

compared to the case of a positive chirp. We attribute this to a fundamental

asymmetry in the system: an excited wavepacket always moves inward on the

attractive molecular potential. For a positive chirp, the resonance condition

moves outward in time, while for a negative chirp, it moves inward, in the same

direction as the excited wavepacket; this allows multiple interactions between

the wavepacket and the light, enabling the wavepacket to be returned coherently

to the ground state. Classical and quantum calculations support this

interpretation.

\\ ( http://arXiv.org/abs/physics/0612071 , 265kb)

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Replacements:

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Paper: cond-mat/0607202

replaced with revised version Fri, 1 Dec 2006 01:43:00 GMT (40kb)

Title: Correlated Fermions on a Checkerboard Lattice

Authors: F. Pollmann, J. J. Betouras, K. Shtengel, P. Fulde

Comments: 4 Pages, 3 Figures; v4: updated version published in Phys. Rev.

Lett.; one reference added

Subj-class: Strongly Correlated Electrons

Journal-ref: Phys. Rev. Lett. 97, 170407 (2006)

DOI: 10.1103/PhysRevLett.97.170407

\\ ( http://arXiv.org/abs/cond-mat/0607202 , 40kb)

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Paper: quant-ph/0606147

replaced with revised version Thu, 30 Nov 2006 22:32:35 GMT (656kb)

Title: Theory for a Hanbury Brown Twiss experiment with a ballistically

expanding cloud of cold atoms

Authors: Jose Viana Gomes (LCFIO), Aur\'{e}lien Perrin (LCFIO), Martijn

Schellekens (LCFIO), Denis Boiron (LCFIO), Christoph I. Westbrook (LCFIO),

Michael Belsley

Proxy: ccsd ccsd-00080649

Subj-class: Quantum Physics; Other

Journal-ref: Physical Review A 74 (07/11/2006) 053607

DOI: 10.1103/PhysRevA.74.053607

\\ ( http://arXiv.org/abs/quant-ph/0606147 , 656kb)

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Paper: cond-mat/0611578

replaced with revised version Fri, 1 Dec 2006 08:33:44 GMT (66kb)

Title: Trapped Resonant Fermions above Superfluid Transition Temperature

Authors: Chi-Ho Cheng and Sung-Kit Yip

Comments: 9 pages, 4 figures

Subj-class: Superconductivity; Other; Atomic Physics

\\ ( http://arXiv.org/abs/cond-mat/0611578 , 66kb)

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Paper: cond-mat/0611620

replaced with revised version Sun, 3 Dec 2006 21:27:01 GMT (143kb)

Title: Bond algebraic liquid phase in strongly correlated multiflavor cold atom

systems

Authors: Cenke Xu and Matthew P. A. Fisher

Comments: 15 pages, 10 figures

Subj-class: Strongly Correlated Electrons; Soft Condensed Matter

\\ ( http://arXiv.org/abs/cond-mat/0611620 , 143kb)

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Paper (*cross-listing*): math-ph/0610075

replaced with revised version Sat, 2 Dec 2006 22:09:36 GMT (10kb)

Title: Hanbury-Brown and Twiss Intensity Correlations of Parabosons

Authors: Charles A. Nelson and Paresh R. Shimpi

Comments: 16 pages; version 4 to add simple p-independent recursion relation

Report-no: SUNY BING 10/1/6

Subj-class: Mathematical Physics

\\ ( http://arXiv.org/abs/math-ph/0610075 , 10kb)

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Paper: cond-mat/0604183

replaced with revised version Tue, 5 Dec 2006 15:43:32 GMT (26kb)

Title: Collisional relaxation of Feshbach molecules and three-body

recombination in 87Rb Bose-Einstein condensates

Authors: G. Smirne, R. M. Godun, D. Cassettari, V. Boyer, C. J. Foot, T. Volz,

N. Syassen, S. D\"urr, G. Rempe, M. D. Lee, K. Goral, T. Koehler

Comments: 4 pages, 3 eps figures (updated references)

Subj-class: Other

\\ ( http://arXiv.org/abs/cond-mat/0604183 , 26kb)

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Paper: quant-ph/0609111

replaced with revised version Mon, 4 Dec 2006 21:11:20 GMT (761kb)

Title: Quantum logic via the exchange blockade in ultracold collisions

Authors: David Hayes, Paul Julienne, Ivan Deutsch

\\ ( http://arXiv.org/abs/quant-ph/0609111 , 761kb)

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Paper: cond-mat/0510290

replaced with revised version Wed, 6 Dec 2006 16:55:31 GMT (22kb)

Title: Biaxial spin-nematic phase of two dimensional disordered rotor models

and spin-one bosons in optical lattices

Authors: Jean-Sebastien Bernier, K. Sengupta, Yong Baek Kim

Comments: revtex file 7 pages, 2 figures, version published in PRB

Subj-class: Strongly Correlated Electrons; Statistical Mechanics

Journal-ref: Phys. Rev. B 74, 155124 (2006)

\\ ( http://arXiv.org/abs/cond-mat/0510290 , 22kb)

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Paper: cond-mat/0604423

replaced with revised version Wed, 6 Dec 2006 03:15:14 GMT (39kb)

Title: Breakdown of the local density approximation in interacting systems of

cold fermions in strongly anisotropic traps

Authors: Adilet Imambekov, C. J. Bolech, Mikhail Lukin, and Eugene Demler

Comments: Final published version

Subj-class: Strongly Correlated Electrons

Journal-ref: Phys. Rev. A 74, 053626 (2006)

DOI: 10.1103/PhysRevA.74.053626

\\ ( http://arXiv.org/abs/cond-mat/0604423 , 39kb)

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Paper: cond-mat/0607834

replaced with revised version Wed, 6 Dec 2006 15:39:46 GMT (220kb)

Title: Polarized fermions in the unitarity limit

Authors: Gautam Rupak, Thomas Schaefer, Andrei Kryjevski

Comments: 5 pages, 5 figures, LaTeX2e; minor changes, note added at the end, to

be published in PRA

Subj-class: Other

\\ ( http://arXiv.org/abs/cond-mat/0607834 , 220kb)

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Paper: quant-ph/0509072

replaced with revised version Wed, 6 Dec 2006 03:39:52 GMT (6kb)

Title: Note on the Zero-Energy-Limit Solution for the Modified Gross-Pitaevskii

Equation

Authors: A. Kwang-Hua Chu

Comments: 4 pages in total; 2002-May completed

\\ ( http://arXiv.org/abs/quant-ph/0509072 , 6kb)

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Paper: cond-mat/0609725

replaced with revised version Thu, 7 Dec 2006 09:35:53 GMT (276kb)

Title: Association of molecules using a resonantly modulated magnetic field

Authors: Thomas M. Hanna, Thorsten Koehler, and Keith Burnett

Comments: 8 pages latex, figures revised, references updated and typos

corrected

Subj-class: Other

\\ ( http://arXiv.org/abs/cond-mat/0609725 , 276kb)

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Paper: cond-mat/0610610

replaced with revised version Thu, 7 Dec 2006 13:55:21 GMT (301kb)

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

Pairing

Authors: Xuguang Huang, Xuewen Hao and Pengfei Zhuang

Comments: 4 pages, 4 figures

Subj-class: Superconductivity

\\ ( http://arXiv.org/abs/cond-mat/0610610 , 301kb)

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Till next week,

Matt.

-- ========================================================================= Dr M. J. Davis, Senior Lecturer in Physics School of Physical Sciences, email: mdavis_at_physics.uq.edu.au University of Queensland, ph : +61 7 334 69824 Brisbane, QLD 4072, fax : +61 7 336 51242 Australia. http://www.physics.uq.edu.au/people/mdavis/ ========================================================================= Matt's arXiv selection: weekly summary of cold-atom papers from arXiv.org http://www.physics.uq.edu.au/people/mdavis/matts_arXiv/ ========================================================================= Legal stuff: Unless stated otherwise, this e-mail represents only the views of the sender and not the views of the University of Queensland =========================================================================Received on Mon Dec 11 2006 - 15:05:16 EST

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