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

Date: Tue, 10 Apr 2007 11:09:49 +1000 (EST)

Date: Tue, 10 Apr 2007 11:09:49 +1000 (EST)

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

Hi everyone,

Hope you had a good Easter weekend. There are 24 new abstracts and 13

replacements this week. One that caught my eye was the report of the

observation of the BKT phase in a 2D lattice at JILA.

One other thing to note is that the arXiv switched its identifier scheme from

the beginning of April, as seen in the later submissions below.

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Paper: cond-mat/0703805

Date: Fri, 30 Mar 2007 09:38:44 GMT (218kb,D)

Title: Multicomponent Bright Solitons in F = 2 Spinor Bose-Einstein Condensates

Authors: Masaru Uchiyama, Jun'ichi Ieda, Miki Wadati

Categories: cond-mat.other

Comments: 13 pages, 8 figures

Subj-class: Other

\\

We study soliton solutions for the Gross--Pitaevskii equation of the spinor

Bose--Einstein condensates with hyperfine spin F=2 in one-dimension. Analyses

are made in two ways: by assuming single-mode amplitudes and by generalizing

Hirota's direct method for multi-components. We obtain one-solitons of

single-peak type in the ferromagnetic, polar and cyclic states, respectively.

Moreover, twin-peak type solitons both in the ferromagnetic and the polar state

are found.

\\ ( http://arXiv.org/abs/cond-mat/0703805 , 49kb)

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Paper: cond-mat/0703816

Date: Fri, 30 Mar 2007 14:04:20 GMT (218kb)

Title: Does Fulleride Superconductivity Crossover Contain a Feshbach Resonance?

Authors: Richard H. Squire and Norman H. March

Categories: cond-mat.supr-con cond-mat.str-el

Comments: 15 pages, 3 figures

Subj-class: Superconductivity; Strongly Correlated Electrons

\\

The pioneering works by Eagles, Leggett, and Nozieres/Schmitt-Rink (reviewed

and augmented by Randeria) emphasize that in the limits of the models studied

both at T = 0 and, the cross-over from a BCS-type to a BEC-type superconductor

is continuous. The BCS and BEC end points seem to be well-established. However,

in the intermediate region, home to fulleride and high temperature

superconductors, considerable extrapolation of the models must be done as there

still is no exact theory. Yet, considerable current literature is devoted to

what appears to be more singular-type phenomena such as quantum critical

points, stripe formation, insulator to superconductor phase transitions, loss

of validity of the Fermi liquid theory, etc.

Using a connection we have made with cold atom Fermion-Boson crossover

theory, we can establish that the resonance previously discussed is a result of

the crossing of the Fermion band by the Boson band. While the ground and singly

excited states appear to remain continuous, the collective modes due to the

resonance transform the nature of the superconductivity. We discuss features of

the resonance and the experimentally observed pre-formed BEC Cooper pair

formation in fullerides, essential to the Boson-Fermion resonance theory. In

addition some of the various singular phenomena discussed above can be put into

perspective.

PACS numbers: 61.48.+c, 74.20.-z, 81.05Tp

\\ ( http://arXiv.org/abs/cond-mat/0703816 , 218kb)

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Paper (*cross-listing*): math-ph/0703086

Date: Thu, 29 Mar 2007 15:32:19 GMT (18kb)

Title: The BCS Model for General Pair Interactions

Authors: Christian Hainzl, Eman Hamza, Robert Seiringer, Jan Philip Solovej

Categories: math-ph cond-mat.supr-con math.MP

Comments: AMSLaTeX, 16 pages

Subj-class: Mathematical Physics; Superconductivity

\\

We present a rigorous analysis of the Bardeen-Cooper-Schrieffer (BCS) model

for general pair interaction potentials. For both zero and positive

temperature, we show that the existence of a non-trivial solution of the

nonlinear BCS gap equation is equivalent to the existence of a negative

eigenvalue of a certain effective linear operator. From this we conclude the

existence of a critical temperature below which the BCS pairing wave function

does not vanish identically. For attractive potentials, we prove that the

critical temperature is non-zero and exponentially small in the strength of the

potential.

\\ ( http://arXiv.org/abs/math-ph/0703086 , 18kb)

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arXiv:0704.0006

Date: Sat, 31 Mar 2007 04:24:59 GMT (901kb)

Title: Bosonic characters of atomic Cooper pairs across resonance

Authors: Y. H. Pong and C. K. Law

Categories: cond-mat.mes-hall

Comments: 6 pages, 4 figures, accepted by PRA

\\

We study the two-particle wave function of paired atoms in a Fermi gas with

tunable interaction strengths controlled by Feshbach resonance. The Cooper pair

wave function is examined for its bosonic characters, which is quantified by

the correction of Bose enhancement factor associated with the creation and

annihilation composite particle operators. An example is given for a

three-dimensional uniform gas. Two definitions of Cooper pair wave function are

examined. One of which is chosen to reflect the off-diagonal long range order

(ODLRO). Another one corresponds to a pair projection of a BCS state. On the

side with negative scattering length, we found that paired atoms described by

ODLRO are more bosonic than the pair projected definition. It is also found

that at $(k_F a)^{-1} \ge 1$, both definitions give similar results, where more

than 90% of the atoms occupy the corresponding molecular condensates.

\\ ( http://arXiv.org/abs/0704.0006.abs , 901kb)

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arXiv:0704.0082

Date: Sun, 1 Apr 2007 12:26:50 GMT (262kb)

Title: Matter-Wave Bright Solitons with a Finite Background in Spinor

Bose-Einstein Condensates

Authors: Tetsuo Kurosaki, Miki Wadati

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

Comments: 18 pages, 4 figures, LaTeX

\\

We investigate dynamical properties of bright solitons with a finite

background in the F=1 spinor Bose-Einstein condensate (BEC), based on an

integrable spinor model which is equivalent to the matrix nonlinear

Schr\"{o}dinger equation with a self-focusing nonlineality. We apply the

inverse scattering method formulated for nonvanishing boundary conditions. The

resulting soliton solutions can be regarded as a generalization of those under

vanishing boundary conditions. One-soliton solutions are derived in an explicit

manner. According to the behaviors at the infinity, they are classified into

two kinds, domain-wall (DW) type and phase-shift (PS) type. The DW-type implies

the ferromagnetic state with nonzero total spin and the PS-type implies the

polar state, where the total spin amounts to zero. We also discuss two-soliton

collisions. In particular, the spin-mixing phenomenon is confirmed in a

collision involving the DW-type. The results are consistent with those of the

previous studies for bright solitons under vanishing boundary conditions and

dark solitons. As a result, we establish the robustness and the usefulness of

the multiple matter-wave solitons in the spinor BECs.

\\ ( http://arXiv.org/abs/0704.0082.abs , 262kb)

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arXiv:0704.0122

Date: Mon, 2 Apr 2007 05:15:28 GMT (628kb)

Title: Spinor dipolar Bose-Einstein condensates; Classical spin approach

Authors: M. Takahashi Sankalpa Ghosh T. Mizushima K. Machida

Categories: cond-mat.other

Comments: 5 pages, 5 figures

\\

Magnetic dipole-dipole interaction dominated Bose-Einstein condensates are

discussed under spinful situations. We treat the spin degrees of freedom as a

classical spin vector, approaching from large spin limit to obtain an effective

minimal Hamiltonian; a version extended from a non-linear sigma model. By

solving the Gross-Pitaevskii equation we find several novel spin textures where

the mass density and spin density are strongly coupled, depending upon trap

geometries due to the long-range and anisotropic natures of the dipole-dipole

interaction.

\\ ( http://arXiv.org/abs/0704.0122.abs , 628kb)

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arXiv:0704.0146

Date: Mon, 2 Apr 2007 09:01:26 GMT (372kb)

Title: Vortices in Bose-Einstein Condensates: Theory

Authors: N. G. Parker, B. Jackson, A. M. Martin, and C. S. Adams

Categories: cond-mat.other

Comments: 17 pages, 2 figures. Book chapter to appear in "Emergent Nonlinear

Phenomena in Bose-Einstein condensates: Theory and Experiment"

(Springer-Verlag).

\\

Vortices are pervasive in nature, representing the breakdown of laminar fluid

flow and hence playing a key role in turbulence. The fluid rotation associated

with a vortex can be parameterized by the circulation $\Gamma=\oint {\rm d}{\bf

r}\cdot{\bf v}({\bf r})$ about the vortex, where ${\bf v}({\bf r})$ is the

fluid velocity field. While classical vortices can take any value of

circulation, superfluids are irrotational, and any rotation or angular momentum

is constrained to occur through vortices with quantized circulation. Quantized

vortices also play a key role in the dissipation of transport in superfluids.

In BECs quantized vortices have been observed in several forms, including

single vortices, vortex lattices, and vortex pairs and rings. The recent

observation of quantized vortices in a fermionic gas was taken as a clear

signature of the underlying condensation and superfluidity of fermion pairs. In

addition to BECs, quantized vortices also occur in superfluid Helium, nonlinear

optics, and type-II superconductors.

\\ ( http://arXiv.org/abs/0704.0146.abs , 372kb)

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arXiv:0704.0233

Date: Mon, 2 Apr 2007 16:52:05 GMT

Title: Many-body interband tunneling as a witness for complex dynamics in the

Bose-Hubbard model

Authors: Andrea Tomadin, Riccardo Mannella, and Sandro Wimberger

Categories: cond-mat.other

Comments: 4 pages, 3 figures

Journal-ref: Phys. Rev. Lett. 98, 130402 (2007)

DOI: 10.1103/PhysRevLett.98.130402

\\

A perturbative model is studied for the tunneling of many-particle states

from the ground band to the first excited energy band, mimicking Landau-Zener

decay for ultracold, spinless atoms in quasi-one dimensional optical lattices

subjected to a tunable tilting force. The distributions of the computed

tunneling rates provide an independent and experimentally accessible signature

of the regular-chaotic transition in the strongly correlated many-body dynamics

of the ground band.

\\ ( http://arXiv.org/abs/0704.0233.abs , )

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arXiv:0704.0289

Date: Mon, 2 Apr 2007 23:51:32 GMT (292kb)

Title: Kosterlitz-Thouless Crossover on a Two-Dimensional Lattice of

Josephson-Coupled Bose-Einstein Condensates

Authors: V. Schweikhard, S. Tung, and E. A. Cornell

Categories: cond-mat.mes-hall

Comments: 4 pages, 3 figures

\\

We observe the Kosterlitz-Thouless crossover in a two-dimensional array of

Josephson-coupled Bose-Einstein condensates. As long as the Josephson

(tunneling) energy J exceeds the thermal energy T, i.e. $J/T \gtrsim 1$, the

array is vortex-free. With decreasing J/T, vortices appear in the system,

destroying long-range phase coherence. We confirm thermal activation as the

vortex formation mechanism and obtain information on the size of bound vortex

pairs as J/T is varied.

\\ ( http://arxiv.org/abs/0704.0289 , 292kb)

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arXiv:0704.0385

Date: Tue, 3 Apr 2007 13:11:30 GMT (49kb)

Title: Super-shell structures and pairing in ultracold trapped Fermi gases

Authors: M. Ogren and H. Heiselberg

Categories: cond-mat.other

Comments: 4 pages, 2 figures.

\\

We calculate level densities and pairing gaps for an ultracold dilute gas of

fermionic atoms in harmonic traps under the influence of mean field and

anharmonic quartic trap potentials. Super-shell structures, which were found in

Hartree-Fock calculations, are calculated analytically within periodic orbit

theory as well as from WKB calculations. For attractive interactions, the

underlying level densities are crucial for pairing and super-shell structures

in gaps are predicted.

\\ ( http://arxiv.org/abs/0704.0385 , 49kb)

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arXiv:0704.0396

Date: Tue, 3 Apr 2007 13:53:07 GMT (48kb)

Title: Finite-temperature phase transitions in a two-dimensional boson Hubbard

model

Authors: Min-Chul Cha and Ji-Woo Lee

Categories: cond-mat.str-el

Comments: 4 pages, 7 figures

\\

We study finite-temperature phase transitions in a two-dimensional boson

Hubbard model with zero-point quantum fluctuations via Monte Carlo simulations

of quantum rotor model, and construct the corresponding phase diagram.

Compressibility shows a thermally activated gapped behavior in the insulating

regime. Finite-size scaling of the superfluid stiffness clearly shows the

nature of the Kosterlitz-Thouless transition. The transition temperature,

$T_c$, confirms a scaling relation $T_c \propto \rho_0^x$ with $x=1.0$. Some

evidences of anomalous quantum behavior at low temperatures are presented.

\\ ( http://arxiv.org/abs/0704.0396 , 48kb)

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arXiv:0704.0440

Date: Tue, 3 Apr 2007 19:02:39 GMT (107kb)

Title: Dynamics of a quantum phase transition in a ferromagnetic Bose-Einstein

condensate

Authors: Bogdan Damski and Wojciech H. Zurek

Categories: cond-mat.other

Comments: 4 pages & figures

Report-no: LAUR-07-1400

\\

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

Bose-Einstein condensate. We determine analytically the scaling properties of

the system magnetization and verify them with numerical simulations in a one

dimensional model.

\\ ( http://arxiv.org/abs/0704.0440 , 107kb)

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arXiv:0704.0447

Date: Tue, 3 Apr 2007 17:38:41 GMT (784kb)

Title: Manipulating the rotational properties of a two-component Bose gas

Authors: J. Christensson (1), S. Bargi (1), K. Karkkainen (1), Y. Yu (1), G. M.

Kavoulakis (1), M. Manninen (2), and S. M. Reimann (1) ((1) LTH, Lund, (2)

Jyvaskyla)

Categories: cond-mat.mes-hall

Comments: 4 pages, RevTex, 4 figures

\\

A rotating, two-component Bose-Einstein condensate is shown to exhibit

vortices of multiple quantization, which are possible due to the interatomic

interactions between the two species. Also, persistent currents are absent in

this system. Finally, the order parameter has a very simple structure for a

range of angular momenta.

\\ ( http://arxiv.org/abs/0704.0447 , 784kb)

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arXiv:0704.0386

Date: Tue, 3 Apr 2007 13:11:40 GMT (20kb)

Title: Quantum non-local effects with Bose-Einstein condensates

Authors: Franck Lalo{\"e} (LKB - Lhomond), William J. Mullin

Categories: quant-ph

Proxy: ccsd hal-00139664

\\

We study the properties of double Bose-Einstein condensates in different spin

states, represented quantum mechanically by double Fock states. We assume that

individual measurements of the spins of the particles are performed in

transverse directions (perpendicular to the spin quantization axis), giving

access to the relative phase of the condensates. Initially, this phase is

completely undefined, and the first measurements provide purely random results.

But a fixed value of this phase rapidly emerges value under the effect of the

successive quantum measurements, giving rise to a quasi-classical situation

where all spins have parallel transverse orientations. If the number of

measurements reaches its maximum value (the number of particles), this

classical phase disappears and quantum effects show up again. These effects can

give rise to substantial violations of Bell type inequalities, comparable to

those obtained with two spins in singlet state, even if the total number of

particles involved is very large.

\\ ( http://arxiv.org/abs/0704.0386 , 20kb)

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arXiv:0704.0291

Date: Tue, 3 Apr 2007 06:35:53 GMT (336kb)

Title: Approaching the Heisenberg limit in an atom laser

Authors: M. Jeppesen and J. Dugu\'e and G. Dennis and M. T. Johnsson and C.

Figl and N. P. Robins and J. D. Close

Categories: physics.atom-ph

Comments: 4 pages, 5 figures

\\

We present experimental results showing the decreased divergence and improved

transverse profile of an atom laser produced by an optical Raman transition,

compared to one produced by an RF transition. We present a theoretical model to

compare with experimental results and find excellent agreement. This model

predicts a limit to the beam quality of a Raman atom laser. This limit is a

factor of 1.3 above the fundamental (Heisenberg) limit.

\\ ( http://arxiv.org/abs/0704.0291 , 336kb)

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arXiv:0704.0480

Date: Wed, 4 Apr 2007 01:41:48 GMT (40kb,D)

Title: Enhanced quantum Zeno effect and bunching in the decay of interacting

bosons from an unstable state

Authors: Sungyun Kim, Artem Dudarev and Joachim Brand

Categories: cond-mat.mes-hall

\\

We theoretically study the decay of two interacting bosons from a leaky trap

by tunneling through a potential barrier. Although decay rates are generally

enhanced by repulsive interactions, we predict a strong suppression of the

decay for short times. This leads to an enhancement of the quantum Zeno effect.

Results from perturbation theory are supplemented by numerical calculations of

the eigenstates and the full time dynamics. In the two-body correlations of the

escaping particles we find bunching and oscillations characteristic of the

interactions within the box.

\\ ( http://arxiv.org/abs/0704.0480 , 40kb)

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arXiv:0704.0476

Date: Wed, 4 Apr 2007 00:05:29 GMT (198kb)

Title: Geometric phase of an atom inside an adiabatic radio frequency potential

Authors: P. Zhang and L. You

Categories: quant-ph

Comments: 12 pages, 7 figures, submitted to Phys. Rev. A

\\

We investigate the geometric phase of an atom inside an adiabatic radio

frequency (rf) potential created from a static magnetic field (B-field) and a

time dependent rf field. The spatial motion of the atomic center of mass is

shown to give rise to a geometric phase, or Berry's phase, to the adiabatically

evolving atomic hyperfine spin along the local B-field. This phase is found to

depend on both the static B-field along the semi-classical trajectory of the

atomic center of mass and an ``effective magnetic field'' of the total B-field,

including the oscillating rf field. Specific calculations are provided for

several recent atom interferometry experiments and proposals utilizing

adiabatic rf potentials.

\\ ( http://arxiv.org/abs/0704.0476 , 198kb)

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arXiv:0704.0606

Date: Wed, 4 Apr 2007 16:32:29 GMT (72kb)

Title: Three-dimensional effects in "atom diodes": atom-optical devices for

one-way motion

Authors: A. Ruschhaupt and J. G. Muga

Categories: quant-ph

Comments: 10 pages, 8 figures

\\

The ``atom diode'' is a laser device that lets the ground state atom pass in

one direction but not in the opposite direction. We examine three-dimensional

effects of that device for arbitrary atomic incidence angles on flat laser

sheets and set breakdown limiting angles and velocities. It is found that a

correct diodic behavior independent of the incident angle can be obtained with

blue detuned lasers.

\\ ( http://arxiv.org/abs/0704.0606 , 72kb)

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arXiv:0704.0641

Date: Wed, 4 Apr 2007 19:19:06 GMT (215kb)

Title: Quantum engineering of photon states with entangled atomic ensembles

Authors: D. Porras J.I. Cirac

Categories: quant-ph

Comments: 6 pages, 3 figures

\\

We propose and analyze a new method to produce single and entangled photons

which does not require cavities. It relies on the collective enhancement of

light emission as a consequence of the presence of entanglement in atomic

ensembles. Light emission is triggered by a laser pulse, and therefore our

scheme is deterministic. Furthermore, it allows one to produce a variety of

photonic entangled states by first preparing certain atomic states using simple

sequences of quantum gates. We analyze the feasibility of our scheme, and

particularize it to: ions in linear traps, atoms in optical lattices, and in

cells at room temperature.

\\ ( http://arxiv.org/abs/0704.0641 , 215kb)

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arXiv:0704.0650

Date: Wed, 4 Apr 2007 20:05:57 GMT (229kb)

Title: Coherent macroscopic quantum tunneling in boson-fermion mixtures

Authors: D. Mozyrsky, I. Martin, E. Timmermans

Categories: cond-mat.mes-hall cond-mat.str-el

Comments: 4 pages, 3 figures

\\

We show that the cold atom systems of simultaneously trapped Bose-Einstein

condensates (BEC's) and quantum degenerate fermionic atoms provide promising

laboratories for the study of macroscopic quantum tunneling. Our theoretical

studies reveal that the spatial extent of a small trapped BEC immersed in a

Fermi sea can tunnel and coherently oscillate between the values of the

separated and mixed configurations (the phases of the phase separation

transition of BEC-fermion systems). We evaluate the period, amplitude and

dissipation rate for $^{23}$Na and $^{40}$K-atoms and we discuss the

experimental prospects for observing this phenomenon.

\\ ( http://arxiv.org/abs/0704.0650 , 229kb)

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arXiv:0704.0653

Date: Wed, 4 Apr 2007 20:36:42 GMT (202kb)

Title: `St\"uckelberg interferometry' with ultracold molecules

Authors: M. Mark, T. Kraemer, P. Waldburger, J. Herbig, C. Chin, H.-C. Naegerl,

R. Grimm

Categories: cond-mat.other

Comments: 4 pages, 5 figures

\\

We report on the realization of a time-domain `St\"uckelberg interferometer',

which is based on the internal state structure of ultracold Feshbach molecules.

Two subsequent passages through a weak avoided crossing between two different

orbital angular momentum states in combination with a variable hold time lead

to high-contrast population oscillations. This allows for a precise

determination of the energy difference between the two molecular states. We

demonstrate a high degree of control over the interferometer dynamics. The

interferometric scheme provides new possibilities for precision measurements

with ultracold molecules.

\\ ( http://arxiv.org/abs/0704.0653 , 202kb)

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arXiv:0704.0733

Date: Thu, 5 Apr 2007 14:32:22 GMT (57kb)

Title: Acceleration and localization of matter in a ring trap

Authors: Yu. V. Bludov, V. V. Konotop

Categories: cond-mat.other

\\

A toroidal trap combined with external time-dependent electric field can be

used for implementing different dynamical regimes of matter waves. In

particular, we show that dynamical and stochastic acceleration, localization

and implementation of the Kapitza pendulum can be originated by means of proper

choice of the external force.

\\ ( http://arxiv.org/abs/0704.0733 , 57kb)

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arXiv:0704.0769

Date: Thu, 5 Apr 2007 17:54:43 GMT (14kb)

Title: The Fermionic Density-functional at Feshbach Resonance

Authors: Michael Seidl and Rajat K. Bhaduri

Categories: cond-mat.other

Comments: Five pages, one table. accepted for publication in PRA

\\

We consider a dilute gas of neutral unpolarized fermionic atoms at zero

temperature.The atoms interact via a short range (tunable) attractive

interaction. We demonstrate analytically a curious property of the gas at

unitarity. Namely, the correlation energy of the gas, evaluated by second order

perturbation theory, has the same density dependence as the first order

exchange energy, and the two almost exactly cancel each other at Feshbach

resonance irrespective of the shape of the potential, provided $(\mu r_s) >>

1$. Here $(\mu)^{-1}$ is the range of the two-body potential, and $r_s$ is

defined through the number density $n=3/(4\pi r_s^3)$. The implications of this

result for universality is discussed.

\\ ( http://arxiv.org/abs/0704.0769 , 14kb)

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arXiv:0704.0763

Date: Thu, 5 Apr 2007 16:52:03 GMT (277kb)

Title: Coherent control of atomic tunneling

Authors: John Martin and Daniel Braun

Categories: quant-ph

Comments: 4 pages revtex, 3 figures

\\

We study the tunneling of a two-level atom in a double-well potential while

the atom is coupled to a single electro--magnetic field mode of a cavity. The

coupling between internal and external degrees of freedom, due to the

mechanical effect on the atom from photon emission into the cavity mode, can

dramatically change the tunneling behavior. We predict that in general the

tunneling process becomes quasiperiodic. In a certain regime of parameters a

collapse and revival of the tunneling occurs. Accessing the internal degrees of

freedom of the atom with a laser allows to coherently manipulate the atom

position, and in particular to prepare the atom in one of the two wells. The

effects described should be observable with a cesium atom in an optical

double-well trap.

\\ ( http://arxiv.org/abs/0704.0763 , 277kb)

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The replacements:

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Paper: cond-mat/0702034

replaced with revised version Fri, 30 Mar 2007 15:45:16 GMT (259kb)

Title: Species-specific optical lattices

Authors: L. J. LeBlanc and J. H. Thywissen

Categories: cond-mat.stat-mech

Comments: 10 pages, 4 figures; v2: minor changes, two references added;

accepted for publication in Phys. Rev. A

Subj-class: Statistical Mechanics

\\ ( http://arXiv.org/abs/cond-mat/0702034 , 259kb)

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Paper: cond-mat/0703506

replaced with revised version Fri, 30 Mar 2007 06:32:50 GMT (168kb)

Title: Mott phases and quantum phase transitions of extended Bose-Hubbard

models in 2+1 dimensions

Authors: K. Sengupta

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

Comments: Mini review; conference proceeeding for STATPHYS - KOLKATA V; to be

published in Physica A. v2: additional refs. added

Subj-class: Strongly Correlated Electrons; Statistical Mechanics

\\ ( http://arXiv.org/abs/cond-mat/0703506 , 168kb)

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Paper: cond-mat/0703788

replaced with revised version Fri, 30 Mar 2007 02:50:56 GMT (234kb)

Title: Classical simulation of infinite-size quantum lattice systems in two

spatial dimensions

Authors: J. Jordan, R. Orus, G. Vidal, F. Verstraete, J. I. Cirac

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

Comments: 4 pages, 4 figures

Subj-class: Strongly Correlated Electrons; Statistical Mechanics

\\ ( http://arXiv.org/abs/cond-mat/0703788 , 234kb)

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arXiv:cond-mat/0701364

replaced with revised version Sun, 1 Apr 2007 07:41:40 GMT (248kb)

Title: Localization of a Bose Einstein condensate in an optical superlattice

Authors: Aranya B Bhattacherjee

Categories: cond-mat.stat-mech

Comments: only Pdf file

\\ ( http://arXiv.org/abs/cond-mat/0701364 , 248kb)

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arXiv:cond-mat/0702094

replaced with revised version Sat, 31 Mar 2007 11:42:16 GMT (114kb)

Title: Collective Modes and Stability of Bose-Fermi Mixtures with a BCS-BEC

Crossover

Authors: Hiroyuki Shibata, Nobuhiko Yokoshi, Susumu Kurihara

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

Comments: 7 pages, 3 figures

\\ ( http://arXiv.org/abs/cond-mat/0702094 , 114kb)

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arXiv:cond-mat/0703805

replaced with revised version Sat, 31 Mar 2007 07:41:42 GMT (49kb)

Title: Multicomponent Bright Solitons in F = 2 Spinor Bose-Einstein Condensates

Authors: Masaru Uchiyama, Jun'ichi Ieda, Miki Wadati

Categories: cond-mat.other

Comments: 13 pages, 8 figures

\\ ( http://arXiv.org/abs/cond-mat/0703805 , 49kb)

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arXiv:cond-mat/0612613

replaced with revised version Tue, 3 Apr 2007 11:45:39 GMT (304kb)

Title: Basic theory tools for degenerate Fermi gases

Authors: Yvan Castin (LKB - Lhomond)

Categories: cond-mat.other

Comments: 60 pages, Proceedings of the Enrico Fermi Varenna School on Fermi

gases (2006), a few typos corrected

\\ ( http://arxiv.org/abs/cond-mat/0612613 , 304kb)

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arXiv:cond-mat/0702066

replaced with revised version Tue, 3 Apr 2007 15:23:06 GMT (835kb)

Title: Pairing without Superfluidity: The Ground State of an Imbalanced Fermi

Mixture

Authors: C. H. Schunck, Y. Shin, A. Schirotzek, M. W. Zwierlein, W. Ketterle

Categories: cond-mat.str-el

\\ ( http://arxiv.org/abs/cond-mat/0702066 , 835kb)

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arXiv:cond-mat/0605184

replaced with revised version Wed, 4 Apr 2007 15:45:17 GMT (852kb)

Title: Preparation of a quantum state with one molecule at each site of an

optical lattice

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

Categories: cond-mat.stat-mech

Journal-ref: Nature Phys. 2, 692 (2006)

DOI: 10.1038/nphys415

\\ ( http://arxiv.org/abs/cond-mat/0605184 , 852kb)

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arXiv:quant-ph/0611005

replaced with revised version Wed, 4 Apr 2007 01:40:53 GMT (388kb)

Title: Properties of a coupled two species atom-heteronuclear molecule

condensate

Authors: Lu Zhou, Weiping Zhang, Hong Y. Ling, Lei Jiang and Han Pu

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

Comments: 7 pages, 4 figures

Journal-ref: Phys. Rev. A 75, 043603 (2007)

DOI: 10.1103/PhysRevA.75.043603

\\ ( http://arxiv.org/abs/quant-ph/0611005 , 388kb)

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\\

arXiv:quant-ph/0611005

replaced with revised version Wed, 4 Apr 2007 01:40:53 GMT (388kb)

Title: Properties of a coupled two species atom-heteronuclear molecule

condensate

Authors: Lu Zhou, Weiping Zhang, Hong Y. Ling, Lei Jiang and Han Pu

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

Comments: 7 pages, 4 figures

Journal-ref: Phys. Rev. A 75, 043603 (2007)

DOI: 10.1103/PhysRevA.75.043603

\\ ( http://arxiv.org/abs/quant-ph/0611005 , 388kb)

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\\

arXiv:0704.0641

replaced with revised version Wed, 4 Apr 2007 20:14:02 GMT (215kb)

Title: Quantum engineering of photon states with entangled atomic ensembles

Authors: D. Porras, J.I. Cirac

Categories: quant-ph

Comments: 6 pages, 3 figures

\\ ( http://arxiv.org/abs/0704.0641 , 215kb)

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\\

arXiv:physics/0610210

replaced with revised version Thu, 5 Apr 2007 09:34:20 GMT (27kb)

Title: Feshbach resonances in ultracold atomic and molecular collisions:

threshold behaviour and suppression of poles in scattering lengths

Authors: Jeremy M. Hutson

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

Comments: 10 pages, 2 figures. Version 4 has slightly revised content to

reflect the realisation that the resonant scattering length a_res can be

complex, which will sometimes produce a reduction in inealastic scattering

near a resonance

\\ ( http://arxiv.org/abs/physics/0610210 , 27kb)

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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 Tue Apr 10 2007 - 11:09:49 EST

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