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

Date: Wed, 21 Jan 2009 19:12:26 +1000

Date: Wed, 21 Jan 2009 19:12:26 +1000

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

Hi all,

It's been a busy start to the year...

A massive 45 new preprints and 12 replacements this week.

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arXiv:0812.2364

Date: Fri, 12 Dec 2008 13:02:00 GMT (506kb)

Title: Modulational instability of matter waves under strong nonlinearity

management

Authors: F.Kh. Abdullaev, A.A. Abdumalikov, R.M. Galimzyanov

Categories: cond-mat.other

DOI: 10.1016/j.physd.2008.11.001

\\

We study modulational instability of matter-waves in Bose-Einstein

condensates (BEC) under strong temporal nonlinearity-management. Both BEC in an

optical lattice and homogeneous BEC are considered in the framework of the

Gross-Pitaevskii equation, averaged over rapid time modulations. For a BEC in

an optical lattice, it is shown that the loop formed on a dispersion curve

undergoes transformation due to the nonlinearity-management. A critical

strength for the nonlinearity-management strength is obtained that changes the

character of instability of an attractive condensate. MI is shown to occur

below(above) the threshold for the positive (negative) effective mass. The

enhancement of number of atoms in the nonlinearity-managed gap soliton is

revealed.

\\ ( http://arxiv.org/abs/0812.2364 , 506kb)

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arXiv:0812.2395

Date: Fri, 12 Dec 2008 15:22:28 GMT (163kb)

Title: Breached pairing in trapped three-color atomic Fermi gases

Authors: Beatriz Errea, Jorge Dukelsky and Gerardo Ortiz

Categories: cond-mat.supr-con

Comments: 4 pages, 5 figures

\\

We introduce an exactly solvable model for trapped three-color atom gases.

Applications to a cigar-shaped trapped cold fermions reveal a complex structure

of breached pairing phases. We find two competing superfluid phases at weak and

intermediate couplings, each one with two color pair condensates, that can be

distinguished from density profile measurements.

\\ ( http://arxiv.org/abs/0812.2395 , 163kb)

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arXiv:0812.2326

Date: Fri, 12 Dec 2008 09:19:08 GMT (916kb)

Title: Narrow-band tunable filter based on velocity-selective optical pumping

in an atomic vapor

Authors: Alessandro Cere, Valentina Parigi, Marta Abad, Florian Wolfgramm, Ana

Predojevic and Morgan W. Mitchell

Categories: quant-ph

Comments: 3 Pages, 4 figures

\\

We demonstrate a tunable, narrow-band filter based on optical-pumping-induced

circular dichroism in rubidium vapor. The filter achieves a peak transmission

of 14.6%, a linewidth of 80 MHz, and an out-of-band extinction >35 dB. The

transmission peak can be tuned within the range of the Doppler linewidth of the

D1 line of atomic rubidium at 795 nm. While other atomic filters work at

frequencies far from absorption, the presented technique provides light

resonant with atomic media, useful for atom-photon interaction experiments. The

technique could readily be extended to other alkali atoms.

\\ ( http://arxiv.org/abs/0812.2326 , 916kb)

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arXiv:0812.2425

Date: Fri, 12 Dec 2008 18:14:15 GMT (357kb)

Title: Efficient multiparticle entanglement via asymmetric Rydberg blockade

Authors: M. Saffman and K. Molmer

Categories: quant-ph

Comments: 3 figures

\\

We present an efficient method for producing $N$ particle entangled states

using Rydberg blockade interactions. Optical excitation of Rydberg states that

interact weakly, yet have a strong coupling to a second control state is used

to achieve state dependent qubit rotations in small ensembles. On the basis of

quantitative calculations we predict that an N=8 Schr\"odinger cat state can be

produced with a fidelity of 84% in cold Rb atoms.

\\ ( http://arxiv.org/abs/0812.2425 , 357kb)

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arXiv:0812.2295

Date: Fri, 12 Dec 2008 05:47:26 GMT (1006kb)

Title: A two-state Raman coupler for coherent atom optics

Authors: J. E. Debs, D. D\''oring, N. P. Robins, C. Figl, P. A. Altin, J. D.

Close

Categories: physics.atom-ph

Comments: 7 Pages, 4 figures

\\

We present results on a Raman laser-system that resonantly drives a closed

two-photon transition between two levels in different hyperfine ground states

of 87Rb. The coupler is based on a novel optical design for producing two

phase-coherent optical beams to drive a Raman transition. Operated as an

outcoupler, it produces an atom laser in a single internal atomic state, with

the lower divergence and increased brightness typical of a Raman outcoupler.

Due to the optical nature of the outcoupling, the two-state outcoupler is an

ideal candidate for transferring photon correlations onto atom-laser beams. As

our laser system couples just two hyperfine ground states, it has also been

used as an internal state beamsplitter, taking the next major step towards free

space Ramsey interferometry with an atom laser.

\\ ( http://arxiv.org/abs/0812.2295 , 1006kb)

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arXiv:0812.2310

Date: Fri, 12 Dec 2008 08:22:29 GMT (645kb)

Title: A free-space Ramsey interferometer with Bose-condensed atoms

Authors: D. D\"oring, J. E. Debs, N. P. Robins, C. Figl, P. A. Altin, and J. D.

Close

Categories: physics.atom-ph

Comments: 4 pages, 3 figures

\\

We present results on the development of an atom interferometer operating on

the atomic clock transition |F=1,mF=0> -> |F=2,mF=0> of Bose-condensed 87Rb

atoms. A pulsed atom laser is output-coupled from a Bose-Einstein condensate

and propagates through a sequence of two internal state beam splitters. The

beam splitters are realized via coherent Raman transitions between the two

atomic clock states.

\\ ( http://arxiv.org/abs/0812.2310 , 645kb)

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arXiv:0812.2629

Date: Sun, 14 Dec 2008 12:59:05 GMT (80kb,D)

Title: Statistical physics of power fluctuations in mode locked lasers

Authors: Oded Basis and Omri Gat

Categories: cond-mat.stat-mech

Comments: 7 pages, 1 figure, RevTeX

\\

We present an analysis of the power fluctuations in the statistical steady

state of a passively mode locked laser. We use statistical light-mode theory to

map this problem to that of fluctuations in a reference equilibrium statistical

physics problem, and in this way study the fluctuations non-perturbatively. The

power fluctuations, being non-critical, are Gaussian and proportional in

amplitude to the inverse square root of the number of degrees of freedom. We

calculate explicit analytic expressions for the covariance matrix of the

overall, pulse and cw power variables, providing complete information on the

single-time power distribution in the laser, and derive a set of

fluctuation-dissipation relations between them and the susceptibilities of the

steady-state quantities.

\\ ( http://arxiv.org/abs/0812.2629 , 80kb)

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arXiv:0812.2736

Date: Mon, 15 Dec 2008 07:56:15 GMT (285kb)

Title: Skyrmion in spinor condensates and its stability in trap potentials

Authors: Akiyuki Tokuno, Yohei Mitamura, Masaki Oshikawa, Igor F. Herbut

Categories: cond-mat.other cond-mat.stat-mech

Comments: 11 pages, 9 figures

\\

A necessary condition for the existence of a Skyrmion in two-component

Bose-Einstein condensates with $\mathrm{SU(2)}$ symmetry was recently provided

by two of the authors [Phys. Rev. Lett. {\bf 97}, 080403 (2006)], by mapping

the problem to a classical particle in a potential subject to time-dependent

dissipation. Here we further elaborate this approach. For two classes of

models, we demonstrate the existence of the critical dissipation strength above

which the Skyrmion solution does not exist. Furthermore, we discuss the local

stability of the Skyrmion solution by considering the second order variation. A

sufficient condition for the local stability is given in terms of the

groundstate energy of a one-dimensional quantum mechanical Hamiltonian. This

condition requires a minimum number of bosons, for a certain class of the trap

potential. In the optimal case, the minimum number of bosons can be as small as

order of $\sim 10^4$.

\\ ( http://arxiv.org/abs/0812.2736 , 285kb)

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arXiv:0812.2748

Date: Mon, 15 Dec 2008 09:14:55 GMT (751kb)

Title: Observation of Superfluidity of Polaritons in Semiconductor

Microcavities

Authors: A. Amo, J. Lefrere, S. Pigeon, C. Adrados, C. Ciuti, I. Carusotto, R.

Houdre, E. Giacobino, A. Bramati

Categories: cond-mat.mtrl-sci cond-mat.mes-hall

Comments: 14 pages, 3 figures

\\

One of the most striking manifestations of quantum coherence in interacting

boson systems is superfluidity. Exciton-polaritons in semiconductor

microcavities are two-dimensional composite bosons predicted to behave as

particular quantum fluids. We report the observation of superfluid motion of

polaritons created by a laser in a semiconductor microcavity. Superfluidity is

investigated in terms of the Landau criterion and manifests itself as the

suppression of scattering from defects when the flow velocity is slower than

the speed of sound in the fluid. On the other hand, a Cerenkov-like wake

pattern is clearly observed when the flow velocity exceeds the speed of sound.

The experimental findings are in excellent quantitative agreement with the

predictions based on a generalized Gross-Pitaevskii theory, showing that

polaritons in microcavities constitute a very rich system for exploring the

physics of non-equilibrium quantum fluids.

\\ ( http://arxiv.org/abs/0812.2748 , 751kb)

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arXiv:0812.2385

Date: Fri, 12 Dec 2008 14:36:34 GMT (23kb)

Title: Quantum mechanical evolution towards thermal equilibrium

Authors: Noah Linden, Sandu Popescu, Anthony J. Short, Andreas Winter

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

Comments: 12.1 pages

\\

The circumstances under which a system reaches thermal equilibrium, and how

to derive this from basic dynamical laws, has been a major question from the

very beginning of thermodynamics and statistical mechanics. Despite

considerable progress, it remains an open problem. Motivated by this issue, we

address the more general question of equilibration. We prove, with virtually

full generality, that reaching equilibrium is a universal property of quantum

systems: Almost any subsystem in interaction with a large enough bath will

reach an equilibrium state and remain close to it for almost all times. We also

prove several general results about other aspects of thermalisation besides

equilibration, for example, that the equilibrium state does not depend on the

detailed micro-state of the bath.

\\ ( http://arxiv.org/abs/0812.2385 , 23kb)

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arXiv:0812.2520

Date: Sat, 13 Dec 2008 04:14:14 GMT (19kb)

Title: Approach to Thermal Equilibrium in the Caldeira-Leggett Model

Authors: Fethi M Ramazanoglu

Categories: quant-ph

Comments: 26 pages, no figures

\\

We provide an explicit analytical calculation that shows the asymptotic

approach of the one dimensional Caldeira-Leggett model to thermal equilibrium

in the high temperature and weak coupling limit. We investigate a free particle

and a harmonic oscillator system, using both the Lindblad and the non-Lindblad

type master equations for each case, and show that thermal equilibrium is

reached exactly for the free particle and aproximately for the harmonic

oscillator, irrespective of the initial preparation of the system. We also

generalize our calculation to higher dimensions.

\\ ( http://arxiv.org/abs/0812.2520 , 19kb)

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arXiv:0812.2582

Date: Sat, 13 Dec 2008 20:55:12 GMT (106kb)

Title: A proposal of implementing Hardy's thought-experiment with particles

that never met

Authors: Sofia Wechsler

Categories: quant-ph

Comments: 5 pages, 2 figures

\\

Hardy's thought-experiment is the strongest argument against the idea of

continuous trajectories of particles from the source to the detector. This idea

seems to result as an unavoidable conclusion from some simple experiments. In

its original form, Hardy's thought-experiment was proposed for two independent

particles, a positron and an electron. The two either meet and annihilate, or

don't meet but become entangled. An important feature of entanglements with

particles that never meet is the difficulty they raise in front of the

assumption of "hidden communication" between the particles. Indeed, if the

particles don't meet, they can't have information of one another and it is

difficult to explain how can they communicate. In order to implement Hardy's

paradox with particles that never meet, the present article proposes to use

photons from three different lasers, one laser emitting UV rays, and the other

two emitting at the wavelength of the signal photon, respectively the idler

photon obtained from the down-conversion of the UV rays. The role of the

annihilation in Hardy's experiment will be played by the destructive

interference between a down-conversion pair and two photons from the low-energy

lasers.

\\ ( http://arxiv.org/abs/0812.2582 , 106kb)

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arXiv:0812.2615

Date: Sun, 14 Dec 2008 11:48:40 GMT (1355kb)

Title: Connection between Wigner distribution of nonclassical fields and

collapse-revival of atomic dynamics

Authors: C. H. Raymond Ooi

Categories: quant-ph

Comments: 5 pages, 4 figures

\\

The transient evolution of nonclassical radiation fields interacting with an

atom in a cavity is correlated to the atomic dynamics. Connection between the

atomic phases of collapse and revival, and the Wigner function pattern is

explored. Initial classical coherent field can evolve into nonclassical field.

Schrodinger cat state field is generate during the atomic collapse phase. For

initial Schrodinger cat field state, the state dissolves with time but revives

during the atomic phase that corresponds with the initial phase. More intricate

but orderly characteristics are found between the collapse-revival dynamics and

the patterns of the Wigner function for initial thermal field.

\\ ( http://arxiv.org/abs/0812.2615 , 1355kb)

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arXiv:0812.2774

Date: Mon, 15 Dec 2008 11:53:51 GMT (149kb)

Title: Two Mode Photon Bunching Effect as Witness of Quantum Criticality in

Circuit QED

Authors: Qing Ai, Ying-Dan Wang, Guilu Long, C. P. Sun

Categories: quant-ph

Comments: 7 pages, 4 figures

\\

We suggest a scheme to probe critical phenomena at a quantum phase transition

(QPT) using the quantum correlation of two photonic modes simultaneously

coupled to a critical system. As an experimentally accessible physical

implementation, a circuit QED system is formed by a capacitively coupled

Josephson junction qubit array interacting with one superconducting

transmission line resonator (TLR). It realizes an Ising chain in the transverse

field (ICTF) which interacts with the two magnetic modes propagating in the

TLR. We demonstrate that in the vicinity of criticality the originally

independent fields tend to display photon bunching effects due to their

interaction with the ICTF. Thus, the occurrence of the QPT is reflected by the

quantum characteristics of the photonic fields.

\\ ( http://arxiv.org/abs/0812.2774 , 149kb)

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arXiv:0812.2701

Date: Mon, 15 Dec 2008 01:52:38 GMT (1221kb,D)

Title: Electro-Optical Nano-Traps for Neutral Atoms

Authors: Brian Murphy and Lene Vestergaard Hau

Categories: physics.atom-ph

Comments: 11 pages, 3 figures

\\

We propose a new class of nanoscale electro-optical traps for neutral atoms.

A prototype is the toroidal trap created by a suspended, charged carbon

nanotube decorated with a silver nanosphere dimer. An illuminating laser field,

blue detuned from an atomic resonance frequency, is strongly focused by

plasmons induced in the dimer and generates both a repulsive potential barrier

near the nanostructure surface and a large viscous damping force that

facilitates trap loading. Atoms with velocities of several meters per second

may be loaded directly into the trap via spontaneous emission of just two

photons.

\\ ( http://arxiv.org/abs/0812.2701 , 1221kb)

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arXiv:0812.2611

Date: Sun, 14 Dec 2008 09:19:39 GMT (195kb)

Title: Vacuum squeezed light for atomic memories at the D2 cesium line

Authors: Sidney Burks (LKB - Jussieu), Alberto Bramati (LKB - Jussieu),

Elisabeth Giacobino (LKB - Jussieu), Julien Laurat (LKB - Jussieu),

J\'er\'emie Ortalo (LKB - Jussieu), Xiaojun Jia (LKB - Jussieu), Fabrizio

Villa (LKB - Jussieu), Antonino Chuimmo (LKB - Jussieu)

Categories: physics.optics

\\

We report the experimental generation of squeezed light at 852 nm, locked on

the Cesium D2 line. 50% of noise reduction down to 50 kHz has been obtained

with a doubly resonant optical parametric oscillator operating below threshold,

using a periodically-polled KTP crystal. This light is directly utilizable with

Cesium atomic ensembles for quantum networking applications

\\ ( http://arxiv.org/abs/0812.2611 , 195kb)

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arXiv:0812.2963

Date: Tue, 16 Dec 2008 02:26:30 GMT (280kb)

Title: Paired states in spin-imbalanced atomic Fermi gases in one dimension

Authors: Paata Kakashvili and C. J. Bolech

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

Comments: 4 pages, 2 figures

\\

A growing expertise to engineer, manipulate and probe different cold-atom

analogs of electronic condensed matter systems allows to probe properties of

exotic pairing. We study paired states of spin-imbalanced ultracold atomic

system of fermions with attractive short-range interactions in one-dimensional

traps. Calculations are done using the Bethe Ansatz technique and the trap is

incorporated into the solution via a local density approximation. The

thermodynamic-Bethe-Ansatz equations are solved numerically and different local

density profiles are calculated for zero and finite temperatures. A procedure

to identify the homogeneous-system phase diagram using local density profiles

in the trap is also proposed. Such scheme would be immediately useful for the

experiments.

\\ ( http://arxiv.org/abs/0812.2963 , 280kb)

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arXiv:0812.2977

Date: Tue, 16 Dec 2008 05:44:14 GMT (13kb)

Title: Exact solution of the infinite-U Hubbard problem and other models in one

dimension

Authors: Brijesh Kumar

Categories: cond-mat.str-el

Comments: revtex4, 6 pages, no figures; submitted to Phys. Rev. B

\\

An interacting spin-fermion model is exactly solved on an open chain. In a

certain representation, it is the nearest-neighbor Hubbard model in the limit

of infinite $U$ (local interaction). Exact solution of its complete energy

eigen-spectrum is accomplished by introducing a unitary transformation which

maps the original problem to a tight-binding model of the fermions only.

Physically, the exact solution implies the absence of Nagaoka ferromagnetism in

the ground state for arbitrary electron densities. The present method solves a

class of very general models exactly. Few more problems are discussed as an

application of this unitary transform method.

\\ ( http://arxiv.org/abs/0812.2977 , 13kb)

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arXiv:0812.3005

Date: Tue, 16 Dec 2008 09:10:37 GMT (116kb)

Title: Trap modulation spectroscopy of the Mott-insulator transition in optical

lattices

Authors: H. Lignier and A. Zenesini and D. Ciampini and O. Morsch and E.

Arimondo and S. Montangero and G. Pupillo and R. Fazio

Categories: cond-mat.other

Comments: 5 pages, 5 figures

\\

We introduce a new technique to probe the properties of an interacting cold

atomic gas that can be viewed as a dynamical compressibility measurement. We

apply this technique to the study of the superfluid to Mott insulator quantum

phase transition in one and three dimensions for a bosonic gas trapped in an

optical lattice. Excitations of the system are detected by time-of-flight

measurements. The experimental data for the one-dimensional case are in good

agreement with the results of a time-dependent density matrix renormalization

group calculation.

\\ ( http://arxiv.org/abs/0812.3005 , 116kb)

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arXiv:0812.3029

Date: Tue, 16 Dec 2008 11:19:53 GMT (349kb)

Title: Rotational Fluxons of Bose-Einstein Condensates in Coplanar Double-Ring

Traps

Authors: J. Brand, T. J. Haigh, U. Z\"ulicke

Categories: cond-mat.other cond-mat.mes-hall

Comments: 4 pages, 3 figures

\\

We investigate the ground-state properties and nonlinear dynamics of rotating

co-planar tunnel-coupled annular Bose-Einstein condensates (BECs). Intriguing

condensate-phase structure emerges due to a competition between coherent

tunneling and the difference of centrifugal potentials in the two rings. As a

result, rotational analogs to magnetic fluxons in conventional Josephson

junctions can exist in the ground state of double-ring BECs. Spatial and

temporal variations of the potential difference between the two rings turn out

to induce fluxon motion. The observation of macroscopic quantum tunneling in

this system appears feasible. Our numerical studies are complemented by an

effective hydrodynamic description of the fluxon dynamics.

\\ ( http://arxiv.org/abs/0812.3029 , 349kb)

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arXiv:0812.3035

Date: Tue, 16 Dec 2008 11:54:52 GMT (1020kb)

Title: The Theory of Fermi Condensate Quantum Phase Transition

Authors: Konstantin Popov

Categories: cond-mat.str-el

Comments: 75 pages, 46 figures, in Russian

\\

This report is devoted to the building of the theory and analyzing the

phenomenon which take place in such strong correlated Fermi systems as High

temperature superconductors, metals with heavy fermions and quasi two

dimensional Fermi-systems. The described theory of strong correlated Fermi

systems bases on conceptions of Fermi condensate quantum phase transition

(FCQPT) and Fermi condensate. It develops the well known Landau paradigm based

on quasi particles formalism and order parameter. The description of the FCQPT

theory is followed by its verification on the different exactly solvable

models, by numerical calculations and by comparing with wide collection of

experimental data.

\\ ( http://arxiv.org/abs/0812.3035 , 1020kb)

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arXiv:0812.3092

Date: Tue, 16 Dec 2008 16:10:49 GMT (80kb)

Title: Two-component gap solitons with linear interconversion

Authors: Sadhan K. Adhikari and Boris A. Malomed

Categories: cond-mat.other

Comments: 4 pages, 9 figures

\\

We consider one-dimensional solitons in a binary Bose-Einstein condensate

with linear coupling between the components, trapped in an optical-lattice

potential. The inter-species and intra-species interactions may be both

repulsive or attractive. Main effects considered here are spontaneous breaking

of the symmetry between components in symmetric and antisymmetric solitons, and

spatial splitting between the components. These effects are studied by means of

a variational approximation and numerical simulations.

\\ ( http://arxiv.org/abs/0812.3092 , 80kb)

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arXiv:0812.3112

Date: Tue, 16 Dec 2008 17:39:47 GMT (149kb)

Title: Hydrodynamics of superfluids confined in blocked rings and wedges

Authors: Chandan Dasgupta and Oriol T. Valls

Categories: cond-mat.other cond-mat.stat-mech

Comments: 15 pages, including figures. To appear in Phys. Rev. E

\\

Motivated by many recent experimental studies of non-classical rotational

inertia (NCRI) in superfluid and supersolid samples, we present a study of the

hydrodynamics of a superfluid confined in the two-dimensional region

(equivalent to a long cylinder) between two concentric arcs of radii $b$ and

$a$ ($b<a$) subtending an angle $\beta$, with $0 \le \beta \le 2\pi$. The case

$\beta= 2 \pi$ corresponds to a blocked ring. We discuss the methodology to

compute the NCRI effects, and calculate these effects both for small angular

velocities, when no vortices are present, and in the presence of a vortex. We

find that, for a blocked ring, the NCRI effect is small, and that therefore

there will be a large discontinuity in the moment of inertia associated with

blocking or unblocking circular paths. For blocked wedges ($b=0$) with $\beta >

\pi$, we find an unexpected divergence of the velocity at the origin, which

implies the presence of either a region of normal fluid or a vortex for {\it

any} nonzero value of the angular velocity. Implications of our results for

experiments on "supersolid" behavior in solid $^4{\rm He}$ are discussed. A

number of mathematical issues are pointed out and resolved.

\\ ( http://arxiv.org/abs/0812.3112 , 149kb)

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arXiv:0812.3121

Date: Tue, 16 Dec 2008 18:18:26 GMT (102kb)

Title: Finite-Temperature Behavior of an Inter-species Fermionic Superfluid

with Population Imbalance

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

Categories: cond-mat.other cond-mat.supr-con

Comments: 4 pages, 4 figures

\\

We determine the superfluid transition temperature $T_c$ and related finite

temperature phase diagrams for the entire BCS-Bose Einstein condensation

crossover in a homogeneous mixture of $^{6}$Li and $^{40}$K atoms with

population imbalance. Our work is motivated by the recent observation of an

inter-species Feshbach resonance. Pairing fluctuation effects, which

significantly reduce $T_c$ from the onset temperature for pairing ($T^*$),

provide reasonable estimates of $T_c$ and indicate that the inter-species

superfluid phase should be accessible in future experiments. Although a

generalized-Sarma phase is not stable in the ground state near unitarity, our

phase diagrams show that it appears as an intermediate-temperature superfluid.

\\ ( http://arxiv.org/abs/0812.3121 , 102kb)

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arXiv:0812.3142

Date: Tue, 16 Dec 2008 20:27:42 GMT (11kb)

Title: Trial wave functions, molecular states, and ro-vibrational spectra in

the lowest Landau level: A universal description for bosons and fermions

Authors: Constantine Yannouleas, Uzi Landman

Categories: cond-mat.mes-hall

Comments: 5 pages with two tables. Revtex

\\

Through the introduction of a class of appropriate translationally invariant

trial wave functions, we show that the strong correlations in the lowest Landau

level (LLL) reflect in finite systems the emergence of intrinsic point-group

symmetries associated with rotations and vibrations of molecules formed through

particle localization. This molecular description is universal, being valid for

both bosons and fermions, for both the yrast and excited states of the LLL

spectra, and for both low and high angular momenta. This physical picture is

fundamentally different from the "quantum-fluid" one associated with

Jastrow-type trial functions.

\\ ( http://arxiv.org/abs/0812.3142 , 11kb)

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arXiv:quant-ph/0610099

Date: Thu, 12 Oct 2006 13:58:24 GMT (248kb)

Title: A class of quantum many-body states that can be efficiently simulated

Authors: G. Vidal

Categories: quant-ph cond-mat.str-el

Comments: 4 pages, 5 figures

Journal-ref: Phys. Rev. Lett. 101, 110501 (2008)

\\

We introduce the multi-scale entanglement renormalization ansatz (MERA), an

efficient representation of certain quantum many-body states on a D-dimensional

lattice. Equivalent to a quantum circuit with logarithmic depth and distinctive

causal structure, the MERA allows for an exact evaluation of local expectation

values. It is also the structure underlying entanglement renormalization, a

coarse-graining scheme for quantum systems on a lattice that is focused on

preserving entanglement.

\\ ( http://arxiv.org/abs/quant-ph/0610099 , 248kb)

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arXiv:0812.3088

Date: Tue, 16 Dec 2008 15:44:52 GMT (216kb)

Title: Efficient formation of ground state ultracold molecules via STIRAP from

the continuum at a Feshbach resonance

Authors: Elena Kuznetsova, Susanne F. Yelin, Marko Gacesa, Philippe Pellegrini,

Robin C\^ot\'e

Categories: quant-ph

\\

We develop a complete theoretical description of photoassociative Stimulated

Raman Adiabatic Passage (STIRAP) near a Feshbach resonance in a thermal atomic

gas. We show that it is possible to use low intensity laser pulses to directly

excite the continuum at a Feshbach resonance and transfer nearly the entire

atomic population to the lowest rovibrational level in the molecular ground

state. In case of a broad resonance, commonly found in several diatomic alkali

molecules, our model predicts a transfer efficiency $\eta$ up to 97% for a

given atom pair, and up to 70% when averaged over an atomic ensemble. The laser

intensities and pulse durations needed for optimal transfer are $10^2-10^3$

W/cm$^2$ and several $\mu$s. Such efficiency compares to or surpasses currently

available techniques for creating stable diatomic molecules, and the

versatility of this approach simplifies its potential use for many molecular

species.

\\ ( http://arxiv.org/abs/0812.3088 , 216kb)

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arXiv:0812.3143

Date: Tue, 16 Dec 2008 20:33:00 GMT (57kb)

Title: Algorithm for simulation of quantum many-body dynamics using dynamical

coarse graining

Authors: M. Khasin and R. Kosloff

Categories: quant-ph

Comments: 22 pages, 4 figures, submitted to Phys. Rev. A

\\

An algorithm for simulating the dynamics of a restricted set of observables

of a many-body system is presented. The set comprises the spectrum-generating

algebra (SGA) of observables of the system. The technical development of the

algorithm is based on the close connection between the algebra of observables

and the set of states minimizing the generalized uncertainty with respect to

these observables -- the generalized coherent states (GCS). These states serve

as dynamical basis functions for expanding the state of the system. The

original unitary dynamics of the observables is simulated by a surrogate

open-system dynamics, which can be interpreted as a weak measurement of the

elements of the SGA, performed on the evolving system. The measurement leads to

a coarse-graining of the evolving state in the corresponding phase-space. The

coarse-grained state can be represented as a mixture of pure states, localized

in the phase-space. The evolution of the pure states is governed by the

stochastic nonlinear Schroedinger equation (sNLSE), which can be simulated at

dramatically lower computational cost using expansion of the localized

solutions in the basis of the GCS. The algorithm is applied to the simulation

of the dynamics of a system of 2*10^4 cold atoms in the double-well trap,

described by the two-sites Bose-Hubbard model.

\\ ( http://arxiv.org/abs/0812.3143 , 57kb)

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\\

arXiv:0812.3139

Date: Tue, 16 Dec 2008 20:17:52 GMT (324kb)

Title: Determination of the fine structure constant with atom interferometry

and Bloch oscillations

Authors: Malo Cadoret (LKB - Jussieu), Estefania De Mirandes (LKB - Jussieu),

Pierre Clad\'e (LKB - Jussieu), Catherine Schwob (LKB - Jussieu),

Fran\c{c}ois Nez (LKB - Jussieu), Lucile Julien (LKB - Jussieu), Fran\c{c}ois

Biraben (LKB - Jussieu), Sa\"ida Guellati-Kh\'elifa (BNM-INM)

Categories: physics.atom-ph

\\

We use Bloch oscillations to transfer coherently many photon momenta to

atoms. Then we can measure accurately the recoil velocity $\hbar k/m$ and

deduce the fine structure constant $\alpha$. The velocity variation due to

Bloch oscillations is measured using atom interferometry. This method yields to

a value of the fine structure constant $\alpha^{-1}= 137.035 999 45 (62)$ with

a relative uncertainty of about $4.5 \times 10^{-9}$.

\\ ( http://arxiv.org/abs/0812.3139 , 324kb)

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\\

arXiv:0812.3193

Date: Wed, 17 Dec 2008 07:44:47 GMT (803kb)

Title: Symmetry Breaking and Self-trapping of a Dipolar Bose-Einstein

Condensate in a Double-well Potential

Authors: Bo Xiong, Jiangbin Gong, Han Pu, Weizhu Bao, and Baowen Li

Categories: cond-mat.other

Comments: 9 pages, 5 figures, to appear in Physical Review A

\\

The quantum self-trapping phenomenon of a Bose-Einstein condensate (BEC)

represents a remarkable nonlinear effect of wide interest. By considering a

purely dipolar BEC in a double-well potential, we study how the dipole

orientation affects the ground state structure and the transition between

self-trapping and Josephson oscillation in dynamics. Three-dimensional

numerical results and an effective two-mode model demonstrate that the onset of

self-trapping of a dipolar BEC can be radically modified by the dipole

orientation. We also analyze the failure of the two-mode model in predicting

the rate of Josephson oscillations. We hope that our results can motivate

experimental work as well as future studies of self-trapping of ultracold

dipolar gases in optical lattices.

\\ ( http://arxiv.org/abs/0812.3193 , 803kb)

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\\

arXiv:0812.3264

Date: Wed, 17 Dec 2008 11:46:43 GMT (235kb)

Title: Dynamic and static density-density correlations in the one-dimensional

Bose gas: exact results and approximations

Authors: Alexander Yu. Cherny and Joachim Brand

Categories: cond-mat.stat-mech cond-mat.mes-hall

Comments: 8 pages, 6 figures

\\

We discuss approximate formulas for the dynamic structure factor of the

one-dimensional Bose gas in the Lieb-Liniger model that appear to be applicable

over a wide range of the relevant parameters such as the interaction strength,

frequency, and wavenumber. The suggested approximations are consistent with the

exact results known in limiting cases. In particular, we encompass exact edge

exponents as well as Luttinger liquid and perturbation theoretic results. We

further discuss derived approximations for the static structure factor and the

pair distribution function g(x). The approximate expressions show excellent

agreement with numerical results based on the algebraic Bethe ansatz.

\\ ( http://arxiv.org/abs/0812.3264 , 235kb)

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\\

arXiv:0812.3287

Date: Wed, 17 Dec 2008 13:22:08 GMT (664kb)

Title: Observation of interspecies Feshbach resonances in an ultracold Rb-Cs

mixture

Authors: K. Pilch, A. D. Lange, A. Prantner, G. Kerner, F. Ferlaino, H.-C.

Naegerl, and R. Grimm

Categories: cond-mat.other

Comments: 7 pages, 3 figures, 1 table

\\

We report on the observation of interspecies Feshbach resonances in an

ultracold, optically trapped mixture of Rb and Cs atoms. In a magnetic field

range up to 300 G we find 23 interspecies Feshbach resonances in the lowest

spin channel and 2 resonances in a higher channel of the mixture. The

extraordinarily rich Feshbach spectrum suggests the importance of different

partial waves in both the open and closed channels of the scattering problem

along with higher-order coupling mechanisms. Our results provide, on one hand,

fundamental experimental input to characterize the Rb-Cs scattering properties

and, on the other hand, identify possible starting points for the association

of ultracold heteronuclear RbCs molecules.

\\ ( http://arxiv.org/abs/0812.3287 , 664kb)

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\\

arXiv:0812.3403

Date: Thu, 18 Dec 2008 07:16:15 GMT (198kb)

Title: A geometrical approach to hydrodynamics and low-energy excitations of

spinor condensates

Authors: Ryan Barnett, Daniel Podolsky, and Gil Refael

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

Comments: 21 pages, 4 figures

\\

In this paper, we derive the equations of motion governing the dynamics of

spin-$F$ spinor condensates. We write the equations of motion in terms of the

standard physical variables (total density and superfluid velocity), alongside

2F `spin-nodes': unit vectors that describe the spin-F state, and also exhibit

the point-group symmetry of a spinor condensate's mean-field ground state. In

the first part of our analysis, we derive the hydrodynamic equations of motion,

which consist of a mass continuity equation, 2F Landau-Lifshitz equations for

the spin-nodes, and a modified Euler equation. In particular, we provide a

generalization of the Mermin-Ho relation to spin-one, and find an analytic

solution for the skyrmion texture in the incompressible regime of a spin-half

condensate. In the second part, we linearize the equations of motion

determining the low lying spin-waves of the condensate. Using the spin-node

formalism, we connect the normal spin-wave excitations with the emergent

symmetry of the spinor-condensate ground state, and provide a simple

construction that allows their extraction from symmetry considerations alone.

These results demonstrate the beautiful geometrical structure that underlies

the dynamics of spinor condensates.

\\ ( http://arxiv.org/abs/0812.3403 , 198kb)

------------------------------------------------------------------------------

\\

arXiv:0812.3417

Date: Wed, 17 Dec 2008 21:55:57 GMT (880kb)

Title: Disorder-induced superfluidity

Authors: Long Dang, Massimo Boninsegni and Lode Pollet

Categories: cond-mat.dis-nn cond-mat.stat-mech

Comments: 4 pages, 5 figures

\\

We use quantum Monte Carlo simulations to study the phase diagram of

hard-core bosons with short-ranged attractive interactions, in the presence of

uniform diagonal disorder. It is shown that moderate disorder stabilizes a

glassy superfluid phase in a range of values of the attractive interaction for

which the system is a Mott insulator, in the absence of disorder. A transition

to an insulating Bose glass phase occurs as the strength of the disorder

increases.

\\ ( http://arxiv.org/abs/0812.3417 , 880kb)

------------------------------------------------------------------------------

\\

arXiv:0812.3430

Date: Thu, 18 Dec 2008 19:05:27 GMT (121kb)

Title: Finite-size and confinement effects in spin-polarized trapped Fermi

gases

Authors: Mark Ku, Jens Braun, Achim Schwenk

Categories: cond-mat.other

Comments: 4 pages, 3 figures

\\

We calculate the energy of a single fermion interacting resonantly with a

Fermi sea of different-species fermions in asymmetric traps, and show that

finite particle numbers and the trap geometry impact the phase structure and

the critical polarization. Our findings contribute to understanding some

experimental discrepancies in spin-polarized Fermi gases as finite-size and

confinement effects.

\\ ( http://arxiv.org/abs/0812.3430 , 121kb)

------------------------------------------------------------------------------\\

arXiv:0812.3450

Date: Thu, 18 Dec 2008 02:51:52 GMT (1223kb)

Title: Seeing Anderson Localization

Authors: M. Hilke

Categories: cond-mat.dis-nn cond-mat.mtrl-sci

Comments: 5 pages, 4 figures

\\

Anderson localization was discovered 50 years ago to describe the propagation

of electrons in the presence of disorder. The main prediction back then, was

the existence of disorder induced localized states, which do not conduct

electricity. Many years later it turns out, that the concept of Anderson

localization is much more general and applies to almost any type of propagation

in time or space, when more than one parameter is relevant (like phase and

amplitude). Here we propose a new optical scheme to literally see Anderson

localization by varying the optical wavelength or angle of incidence to tune

between localized and delocalized states. The occurrence of Anderson

localization in the propagation of light, in particular, has become the focus

of tremendous interest due to the emergence of new optical technologies and

media, such as low dimensional and disordered optical lattices. While several

experiments have reported the measurement of Anderson localization of light,

many of the observations remain controversial because the effects of absorption

and localization have a similar signature, i.e., exponential decrease of the

transmission with the system size. In this work, we discuss a system, where we

can clearly differentiate between absorption and localization effects because

this system is equivalent to a perfect filter, only in the absence of any

absorption. Indeed, only one wavelength is perfectly transmitted and all others

are fully localized. These results were obtained by developing a new

theoretical framework for the average optical transmission through disordered

media.

\\ ( http://arxiv.org/abs/0812.3450 , 1223kb)

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\\

arXiv:0812.3479

Date: Thu, 18 Dec 2008 08:51:10 GMT (150kb)

Title: Superfluidity and Anderson localisation for a weakly interacting Bose

gas in a quasiperiodic potential

Authors: Xiaolong Deng (LPM2C), Roberta Citro (Salerno), Anna Minguzzi (LPM2C),

Edmond Orignac (ENS-Lyon)

Categories: cond-mat.mes-hall cond-mat.other

Comments: 12 pages, 9 figures, RevTeX 4

\\

Using exact diagonalisation and Density Matrix Renormalisation group (DMRG)

approach, we analyse the transition to a localised state of a weakly

interacting quasi-1D Bose gas subjected to a quasiperiodic potential. The

analysis is performed by calculating the superfluid fraction, density profile,

momentum distribution and visibility for different periodicities of the second

lattice and in the presence (or not) of a weak repulsive interaction. It is

shown that the transition is sharper towards the maximally incommensurate ratio

between the two lattice periodicities, and shifted to higher values of the

second lattice strength by weak repulsive interactions. We also relate our

results to recent experiments.

\\ ( http://arxiv.org/abs/0812.3479 , 150kb)

------------------------------------------------------------------------------

\\

arXiv:0812.3501

Date: Thu, 18 Dec 2008 10:20:01 GMT (1344kb)

Title: Dipole Oscillations of a Fermi Gas in a Disordered Trap: Damping and

Localization

Authors: Luca Pezz\'e, Ben Hambrecht, Laurent Sanchez-Palencia

Categories: cond-mat.other

Comments: 4 pages, 4 figures

\\

We study the dipole oscillations of an ideal Fermi gas in a disordered trap.

We show that even weak disorder induces strong damping of the oscillations and

we identify a metal-insulator crossover: For very weak disorder, we find

under-damping and show that it results from weak random perturbations of the

energy spectrum. For increasing disorder, we show that the Fermi gas crosses

over to a strongly insulating regime characterized by over-damping resulting

from the proliferation of localized states.

\\ ( http://arxiv.org/abs/0812.3501 , 1344kb)

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\\

arXiv:0812.3543

Date: Thu, 18 Dec 2008 14:38:03 GMT (43kb)

Title: Hybrid multi-site excitations in dipolar condensates in optical lattices

Authors: M. Klawunn and L. Santos

Categories: cond-mat.other

Comments: 4 pages, 6 figures

\\

Strong 1D lattices usually lead to unconnected two-dimensional gases. The

long-range character of the dipole-dipole interactions leads to a novel

scenario where non-overlapping gases at different sites may interact

significantly. We show that the excitations of non-overlapping condensates in

1D optical lattices acquire a band-like character, being collectively shared by

different sites. In particular, the hybridization of the modes significantly

enhances the rotonization of the excitations, and may induce roton-instability.

We discuss the observability of this effect in on-going experiments.

\\ ( http://arxiv.org/abs/0812.3543 , 43kb)

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\\

arXiv:0812.3573

Date: Thu, 18 Dec 2008 16:11:59 GMT (866kb)

Title: Formation of dynamical Schr\"odinger cats in low-dimensional ultracold

attractive Bose gases

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

Categories: cond-mat.other

Comments: 11 pages, 3 figures

\\

Dynamical Schr\"odinger cats can be formed when a one-dimensional attractive

Bose-gas cloud is scattered off a potential barrier. Once formed, these objects

are stable in time. The phenomenon and its mechanism -- transformation of

kinetic energy to internal energy of the scattered atomic cloud -- are obtained

by solving the time-dependent many-boson Schr\"odinger equation. Implications

are discussed.

\\ ( http://arxiv.org/abs/0812.3573 , 866kb)

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\\

arXiv:0812.3630

Date: Thu, 18 Dec 2008 19:42:28 GMT (736kb)

Title: Hybrid 2D surface trap for quantum simulation

Authors: J.I. Gillen, W. S. Bakr, A. Peng, P. Unterwaditzer, S. Foelling, M.

Greiner

Categories: cond-mat.other

Comments: 5 pages, 4 figures

\\

We demonstrate a novel optical trapping scheme for ultracold atoms. Using a

combination of evanescent wave, standing wave, and magnetic potentials we

create a deeply 2D Bose-Einstein condensate (BEC) at a few microns from a glass

surface. Using techniques such as broadband "white" light to create evanescent

and standing waves, we realize a smooth potential with a trap frequency aspect

ratio of 300:1:1 and long lifetimes. This makes the setup suitable for

many-body quantum simulations and applications such as high precision

measurements close to surfaces.

\\ ( http://arxiv.org/abs/0812.3630 , 736kb)

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\\

arXiv:0812.3643

Date: Thu, 18 Dec 2008 20:25:50 GMT (69kb)

Title: Large Amplitude Dynamics of the Pairing Correlations in a Unitary Fermi

Gas

Authors: Aurel Bulgac and Sukjin Yoon

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

Comments: 4 pages, 3 figures

\\

A unitary Fermi gas has a surprisingly rich spectrum of large amplitude modes

of the pairing field alone, which defies a description within a formalism

involving only a reduced set of degrees of freedom, such as quantum

hydrodynamics or a Landau-Ginzburg like description. These modes are very slow,

with oscillation frequencies well below the pairing gap, which makes their

coupling with quasiparticle excitations quite ineffective. In atomic traps

these modes couple naturally with the density oscillations, and the

corresponding oscillations of the atomic cloud are an example of a new type of

collective mode in Fermi systems. They have slower frequencies than the

compressional collective hydrodynamic oscillations, have a non-spherical

momentum distribution, and they could be excited by a quick time variation of

the scattering length.

\\ ( http://arxiv.org/abs/0812.3643 , 69kb)

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\\

arXiv:0812.2611 (*cross-listing*)

Date: Sun, 14 Dec 2008 09:19:39 GMT (195kb)

Title: Vacuum squeezed light for atomic memories at the D2 cesium line

Authors: Sidney Burks (LKB - Jussieu), Alberto Bramati (LKB - Jussieu),

Elisabeth Giacobino (LKB - Jussieu), Julien Laurat (LKB - Jussieu),

J\'er\'emie Ortalo (LKB - Jussieu), Xiaojun Jia (LKB - Jussieu), Fabrizio

Villa (LKB - Jussieu), Antonino Chuimmo (LKB - Jussieu)

Categories: physics.optics quant-ph

\\

We report the experimental generation of squeezed light at 852 nm, locked on

the Cesium D2 line. 50% of noise reduction down to 50 kHz has been obtained

with a doubly resonant optical parametric oscillator operating below threshold,

using a periodically-polled KTP crystal. This light is directly utilizable with

Cesium atomic ensembles for quantum networking applications

\\ ( http://arxiv.org/abs/0812.2611 , 195kb)

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\\

arXiv:0812.3509

Date: Thu, 18 Dec 2008 18:49:44 GMT (364kb)

Title: New Measurement of the 2S Hyperfine Interval in Atomic Hydrogen

Authors: N. Kolachevsky, A. Matveev, J. Alnis, C.G. Parthey, S.G. Karshenboim,

T.W. Haensch

Categories: physics.atom-ph

Comments: 5 pages, 4 figures

\\

An optical measurement of the 2S hyperfine interval in atomic hydrogen using

two-photon spectroscopy of the 1S-2S transition gives a value of 177 556

834.3(6.7) Hz. The uncertainty is 2.4 times less than achieved by our group in

2003 and more than 4 times less than for any independent radio-frequency

measurement. The specific combination of the 1S and 2S hyperfine intervals

predicted by QED theory $D_{21}=48 953(3)$ Hz is in perfect agreement with the

value $48 923(54)$ obtained from this experiment.

\\ ( http://arxiv.org/abs/0812.3509 , 364kb)

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\\

arXiv:0812.3439

Date: Thu, 18 Dec 2008 00:38:22 GMT (409kb)

Title: Stable higher-charge discrete vortices in hexagonal optical lattices

Authors: Kody J.H. Law, P. G. Kevrekidis, Tristram J. Alexander, Wieslaw

Krolikowski, and Yuri S. Kivshar

Categories: physics.optics

\\

We show that double-charge discrete optical vortices may be completely stable

in hexagonal photonic lattices where single-charge vortices always exhibit

dynamical instabilities. Even when unstable the double-charge vortices

typically have a much weaker instability than the single-charge vortices, and

thus their breakup occurs at longer propagation distances.

\\ ( http://arxiv.org/abs/0812.3439 , 409kb)

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The replacements:

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\\

arXiv:0802.3158

replaced with revised version Fri, 12 Dec 2008 11:29:05 GMT (66kb)

Title: Probing ultra-cold Fermi atoms with a single ion

Authors: Y. Sherkunov, B. Muzykantskii, N. d'Ambrumenil, B.D Simons

Categories: cond-mat.str-el

Comments: 5 pages, 2 figures

\\ ( http://arxiv.org/abs/0802.3158 , 66kb)

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\\

arXiv:0811.2758

replaced with revised version Fri, 12 Dec 2008 11:35:48 GMT (45kb)

Title: Effective Nonlinear Schr\"odinger Equations for Cigar-Shaped and

Disk-Shaped Fermi Superfluids at Unitarity

Authors: S. K. Adhikari and L. Salasnich

Categories: cond-mat.other

Comments: 22 pages, 5 figures

\\ ( http://arxiv.org/abs/0811.2758 , 45kb)

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\\

arXiv:0807.4563

replaced with revised version Sat, 13 Dec 2008 21:26:31 GMT (776kb)

Title: Three-body Interactions in one Dimension

Authors: B. Capogrosso-Sansone, S. Wessel, H.P. B\"uchler, P. Zoller, and G.

Pupillo

Categories: cond-mat.other

Comments: 5 pages, 4 figures, minor changes in the text

\\ ( http://arxiv.org/abs/0807.4563 , 776kb)

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\\

arXiv:0804.3501 (*cross-listing*)

replaced with revised version Sat, 13 Dec 2008 13:55:50 GMT (799kb)

Title: Lattice simulations for few- and many-body systems

Authors: Dean Lee (North Carolina State University)

Categories: nucl-th cond-mat.other hep-lat

Comments: 71 pages, 20 figures, published version to appear in Progress in

Particle and Nuclear Physics

\\ ( http://arxiv.org/abs/0804.3501 , 799kb)

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\\

arXiv:0808.2171

replaced with revised version Fri, 12 Dec 2008 23:44:49 GMT (324kb)

Title: Magneto-Optical Trap for Polar Molecules

Authors: Benjamin K. Stuhl, Brian C. Sawyer, Dajun Wang, Jun Ye

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

Comments: 4 pages, 4 figures, 1 table v2: updated to final published text and

figures

Journal-ref: Phys. Rev. Lett. 101, 243002 (2008)

DOI: 10.1103/PhysRevLett.101.243002

\\ ( http://arxiv.org/abs/0808.2171 , 324kb)

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\\

arXiv:0806.3754

replaced with revised version Tue, 16 Dec 2008 13:30:04 GMT (693kb)

Title: Quantum critical behavior in strongly interacting Rydberg gases

Authors: Hendrik Weimer, Robert L\"ow, Tilman Pfau, Hans Peter B\"uchler

Categories: quant-ph cond-mat.mes-hall cond-mat.stat-mech

Comments: 4 pages, 3 figures, published version

Journal-ref: Phys. Rev. Lett. 101, 250601 (2008)

DOI: 10.1103/PhysRevLett.101.250601

\\ ( http://arxiv.org/abs/0806.3754 , 693kb)

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arXiv:0806.3062

replaced with revised version Tue, 16 Dec 2008 18:22:54 GMT (1310kb,D)

Title: Dimer-dimer collisions at finite energies in two-component Fermi gases

Authors: J. P. D'Incao, Seth T. Rittenhouse, N. P. Mehta, Chris H. Greene

Categories: physics.atom-ph

Comments: 4.1 pages, 3 figures, revised text. Supplemental material provided: 2

pages, 2 figures

\\ ( http://arxiv.org/abs/0806.3062 , 1310kb)

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\\

arXiv:0807.0412

replaced with revised version Wed, 17 Dec 2008 20:48:32 GMT (241kb)

Title: Spin 3/2 fermions with attractive interactions in a one-dimensional

optical lattice: phase diagrams, entanglement entropy, and the effect of the

trap

Authors: G. Roux, S. Capponi, P. Lecheminant, P. Azaria

Categories: cond-mat.str-el

Comments: 15 pages, 21 figures

Journal-ref: Eur. Phys. J. B (2008)

DOI: 10.1140/epjb/e2008-00374-7

\\ ( http://arxiv.org/abs/0807.0412 , 241kb)

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\\

arXiv:0807.1433

replaced with revised version Wed, 17 Dec 2008 04:49:41 GMT (142kb)

Title: Non-Abelian magnetic monopole in a Bose-Einstein condensate

Authors: Ville Pietil\"a and Mikko M\"ott\"onen

Categories: cond-mat.other cond-mat.mes-hall

Comments: 5 pages, 1 color figure; v2 modified according to referees'

suggestions, some typos corrected

\\ ( http://arxiv.org/abs/0807.1433 , 142kb)

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\\

arXiv:0810.3720

replaced with revised version Wed, 17 Dec 2008 13:24:53 GMT (410kb)

Title: On quenches in quantum many-body systems: the one-dimensional

Bose-Hubbard model revisited

Authors: Guillaume Roux

Categories: cond-mat.str-el cond-mat.stat-mech

Comments: 4 pages, 4 figures

\\ ( http://arxiv.org/abs/0810.3720 , 410kb)

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\\

arXiv:0704.3984

replaced with revised version Thu, 18 Dec 2008 16:25:38 GMT (13kb)

Title: Exact renormalisation group flow for ultracold Fermi gases in unitary

limit

Authors: Boris Krippa

Categories: cond-mat.supr-con nucl-th

Comments: 11 pages, Revtex, misprints corrected, references and comments added

\\ ( http://arxiv.org/abs/0704.3984 , 13kb)

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\\

arXiv:0806.0423

replaced with revised version Wed, 17 Dec 2008 23:13:08 GMT (113kb)

Title: Universality and Anomalous Mean-Field Breakdown of Symmetry-Breaking

Transitions in A Coupled Two-Component Condensate

Authors: Chaohong Lee

Categories: cond-mat.mes-hall cond-mat.other

Comments: 4 pages, 3 eps figures, revised and improved version

\\ ( http://arxiv.org/abs/0806.0423 , 113kb)

------------------------------------------------------------------------------

Till next time,

Matt.

-- ========================================================================= Dr M. J. Davis, Associate Professor in Physics School of Mathematics and Physics, ph : +61 7 334 69824 The University of Queensland, fax : +61 7 336 51242 Brisbane, QLD 4072, mdavis_at_physics.uq.edu.au Australia. www.physics.uq.edu.au/people/mdavis/ ========================================================================= Matt's arXiv selection: weekly summary of cold-atom papers from arXiv.org http://www.physics.uq.edu.au/people/mdavis/matts_arXiv/ ========================================================================= Legal stuff: Unless stated otherwise, this e-mail represents only the views of the sender and not the views of the University of Queensland =========================================================================Received on Wed Feb 25 2009 - 08:32:10 EST

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