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

Date: Mon, 13 Feb 2006 10:51:41 +1000 (EST)

Date: Mon, 13 Feb 2006 10:51:41 +1000 (EST)

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

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Paper: cond-mat/0602061

Date: Thu, 2 Feb 2006 22:53:14 GMT (363kb)

Title: Quantum turbulence and correlations in Bose-Einstein condensate

collisions

Authors: A. A. Norrie, R. J. Ballagh, C. W. Gardiner, and A. S. Bradley

Subj-class: Other

\\

We investigate numerically simulated collisions between experimentally

realistic Bose-Einstein condensate wavepackets, within a regime where highly

populated scattering haloes are formed. The theoretical basis for this work is

the truncated Wigner method, for which we present a detailed derivation, paying

particular attention to its validity regime for colliding condensates. This

paper is an extension of our previous Letter [A. A. Norrie, R. J. Ballagh, and

C. W. Gardiner, Phys. Rev. Lett. 94, 040401 (2005)] and we investigate both

single-trajectory solutions, which reveal the presence of quantum turbulence in

the scattering halo, and ensembles of trajectories, which we use to calculate

quantum-mechanical correlation functions of the field.

\\ ( http://arXiv.org/abs/cond-mat/0602061 , 363kb)

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Paper: cond-mat/0602062

Date: Thu, 2 Feb 2006 23:26:55 GMT (44kb)

Title: Three-body recombination of ultracold Bose gases using the truncated

Wigner method

Authors: A. A. Norrie, R. J. Ballagh and C. W. Gardiner

Subj-class: Other

\\

We apply the truncated Wigner method to the process of three-body

recombination in ultracold Bose gases. We find that within the validity regime

of the Wigner truncation for two-body scattering, three-body recombination can

be treated using a set of coupled stochastic differential equations that

include diffusion terms, and can be simulated using known numerical methods. As

an example we investigate the behaviour of a simple homogeneous Bose gas.

\\ ( http://arXiv.org/abs/cond-mat/0602062 , 44kb)

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Paper: cond-mat/0602069

Date: Fri, 3 Feb 2006 07:42:01 GMT (60kb)

Title: Evaporation of an atomic beam on a material surface

Authors: Gael Reinaudi (LKB - Lhomond), Thierry Lahaye (LKB - Lhomond), Antoine

Couvert (LKB - Lhomond), Zhaoying Wang (LKB - Lhomond), David

Gu\'{e}ry-Odelin (LKB - Lhomond)

Comments: Submitted to Phys. Rev. A

Proxy: ccsd ccsd-00018475

Subj-class: Other

\\

We report on the implementation of evaporative cooling of a magnetically

guided beam by adsorption on a ceramic surface. We use a transverse magnetic

field to shift locally the beam towards the surface, where atoms are

selectively evaporated. With a 5~mm long ceramic piece, we gain a factor

$1.5\pm0.2$ on the phase space density. Our results are consistent with a 100%

efficiency of this evaporation process. The flexible implementation that we

have demonstrated, combined with the very local action of the evaporation zone,

makes this method particularly suited for the evaporative cooling of a beam.

\\ ( http://arXiv.org/abs/cond-mat/0602069 , 60kb)

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Paper: cond-mat/0602077

Date: Fri, 3 Feb 2006 17:48:14 GMT (37kb)

Title: Entanglement scaling in critical two-dimensional fermionic and bosonic

systems

Authors: Thomas Barthel, Ming-Chiang Chung, Ulrich Schollwoeck

Comments: 4 pages, 4 figures

Subj-class: Statistical Mechanics; Strongly Correlated Electrons

\\

We relate the reduced density matrices of quadratic bosonic and fermionic

models to their Green's function matrices in a unified way and calculate the

scaling of bipartite entanglement of finite systems in an infinite universe

exactly. For critical fermionic 2D systems at T=0, we identify two kinds of

scaling: generically, we find a logarithmic correction to the area law with a

prefactor dependence on the chemical potential that confirms earlier

predictions based on the Widom conjecture. If, however, the gap closes in a

zero-dimensional region of momentum space only, we find an area law with a

sublogarithmic correction only. For a critical bosonic 2D array of coupled

oscillators at T=0, our results indicate that entropy follows the area law

without corrections.

\\ ( http://arXiv.org/abs/cond-mat/0602077 , 37kb)

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Paper: cond-mat/0602080

Date: Fri, 3 Feb 2006 14:55:10 GMT (50kb)

Title: Squeezing in the weakly interacting Bose condensate

Authors: Masudul Haque (Utrecht), Andrei E. Ruckenstein (Rutgers)

Comments: 8 pages, 3 figures

Subj-class: Statistical Mechanics; Other

\\

We investigate the presence of squeezing in the weakly repulsive uniform Bose

gas, in both the condensate mode and in the nonzero opposite-momenta mode

pairs, using two different variational formulations. We explore U(1) symmetry

breaking and Goldstone's theorem in the context of a squeezed coherent

variational wavefunction, and present the associated Ward identitiy. Squeezing

of the condensate mode is proved to be strictly absent at the mean field

Hartree-Fock-Bogoliubov level. While condensate-mode squeezing is nonzero due

to contributions from beyond mean field, it is shown to have no thermodynamic

effects. The non-condensate pair-mode squeezing is given a physical

interpretation in terms of density-phase variables using a second variational

wavefunction based on a previous number-conserving formulation of the

interacting Bose gas.

\\ ( http://arXiv.org/abs/cond-mat/0602080 , 50kb)

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Paper: cond-mat/0602091

Date: Fri, 3 Feb 2006 20:25:56 GMT (11kb)

Title: Spin 1/2 Fermions in the Unitary Regime at Finite Temperature

Authors: Aurel Bulgac, Joaquin E. Drut, Piotr Magierski

Comments: 6 pages, 2 figures, version for the Proceedings of QMBT13

Subj-class: Statistical Mechanics

\\

We have performed a fully non-perturbative calculation of the thermal

properties of a system of spin 1/2 fermions in 3D in the unitary regime. We

have determined the critical temperature for the superfluid-normal phase

transition. The thermodynamic behavior of this system presents a number of

unexpected features, and we conclude that spin 1/2 fermions in the BCS-BEC

crossover should be classified as a new type of superfluid.

\\ ( http://arXiv.org/abs/cond-mat/0602091 , 11kb)

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Paper: quant-ph/0602033

Date: Thu, 2 Feb 2006 23:45:05 GMT (533kb)

Title: Continuous variable tripartite entanglement and Einstein-Podolsky-Rosen

correlations from triple nonlinearities

Authors: M.K. Olsen, A.S. Bradley, M.D. Reid

Comments: 23 pages 12 figures

\\

We compare theoretically the tripartite entanglement available from the use

of three concurrent $\chi^{(2)}$ nonlinearities and three independent squeezed

states mixed on beamsplitters, using the van Loock-Furusawa inequalities. We

also define three-mode generalisations of the Einstein-Podolsky-Rosen paradox

which are an alternative for demonstrating the inseparability of the density

matrix.

\\ ( http://arXiv.org/abs/quant-ph/0602033 , 533kb)

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Paper: quant-ph/0602048

Date: Fri, 3 Feb 2006 17:13:26 GMT (10kb)

Title: Single-Site Entanglement of Fermions at a Quantum Phase Transition

Authors: Daniel Larsson and Henrik Johannesson

Comments: 4 pages, no figure

\\

We show that the single-site entanglement of a generic spin-1/2 fermionic

lattice system can be used as a reliable marker of a finite-order quantum phase

transition, given certain provisos. We discuss the information contained in the

single-site entanglement measure, and provide illustrations from the

Mott-Hubbard metal-insulator transitions of the one-dimensional Hubbard model,

and the Hubbard model with long-range hopping.

\\ ( http://arXiv.org/abs/quant-ph/0602048 , 10kb)

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Paper: physics/0509109

replaced with revised version Fri, 3 Feb 2006 03:31:44 GMT (714kb)

Title: Coherent control of ultracold molecule dynamics in a magneto-optical

trap using chirped femtosecond laser pulses

Authors: Benjamin L. Brown, Alexander J. Dicks, Ian A. Walmsley

Comments: 4 pages, 4 figures v2 - slight corrections

Subj-class: Atomic Physics; Chemical Physics

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Paper: cond-mat/0602100

Date: Sat, 4 Feb 2006 09:43:38 GMT (59kb)

Title: Bloch oscillations of strongly interacting Bose atoms

Authors: Andrey R. Kolovsky

Comments: EPL-style, 6 pages, 3 figures

Subj-class: Other

\\

We analyse Bloch oscillations (i.e., oscillations induced by a static force)

of strongly interacting Bose atoms {\em beyond} the hard-core bosons model. It

is shown that residual interactions between the atoms modulate Bloch

oscillations, where the type of modulations depends on the magnitude of the

static force.

\\ ( http://arXiv.org/abs/cond-mat/0602100 , 59kb)

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Paper: cond-mat/0602103

Date: Sat, 4 Feb 2006 16:59:49 GMT (203kb)

Title: A lattice of double wells for manipulating pairs of cold atoms

Authors: J. Sebby-Strabley, M. Anderlini, P. S. Jessen, and J. V. Porto

Comments: 9 pages, 11 figures Accepted for publication in Physical Review A

Subj-class: Other

\\

We describe the design and implementation of a 2D optical lattice of double

wells suitable for isolating and manipulating an array of individual pairs of

atoms in an optical lattice. Atoms in the square lattice can be placed in a

double well with any of their four nearest neighbors. The properties of the

double well (the barrier height and relative energy offset of the paired sites)

can be dynamically controlled. The topology of the lattice is phase stable

against phase noise imparted by vibrational noise on mirrors. We demonstrate

the dynamic control of the lattice by showing the coherent splitting of atoms

from single wells into double wells and observing the resulting double-slit

atom diffraction pattern. This lattice can be used to test controlled neutral

atom motion among lattice sites and should allow for testing controlled

two-qubit gates.

\\ ( http://arXiv.org/abs/cond-mat/0602103 , 203kb)

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Paper: cond-mat/0602108

Date: Sun, 5 Feb 2006 03:08:57 GMT (145kb)

Title: Supersonic optical tunnels for Bose-Einstein condensates

Authors: S. Wuester and B. J. Dabrowska

Comments: 4 pages, 3 figures

Subj-class: Other

\\

We propose a new system of energetically stable high-charge ring flows in

Bose-Einstein condensates. It consists of a stack of parallel matter-wave ring

vortices, pinned by an optical vortex laser beam. The quasi one-dimensional

flow through the optical tunnel in the core of the optical vortex can be used

to study the disruption of superfluid behavior above the sound velocity. Our 3D

simulations show the creation of trains of propagating gray solitons and a

temporarily immobile single soliton. The flow past the solitons is supersonic.

We discuss the possibility of using the resulting soliton sonic horizon for the

study of analogue Hawking radiation.

\\ ( http://arXiv.org/abs/cond-mat/0602108 , 145kb)

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Paper: cond-mat/0602119

Date: Mon, 6 Feb 2006 04:35:02 GMT (42kb)

Title: The effect of thermal fluctuations on spin degrees of freedom in spinor

Bose-Einstein condensate

Authors: W. V. Pogosov, K. Machida

Comments: 5 pages, 2 figures

Subj-class: Other

\\

We consider the effect of thermal fluctuations on rotating spinor F=1

condensates in axially-symmetric vortex phases, when all the three hyperfine

states are populated. We show that the relative phase among different

components of the order parameter can fluctuate strongly due to the weakness of

the interaction in the spin channel. These fluctuations can be significant even

at large number of particles condensed and at low temperatures. Fluctuations of

relative phase lead to fluctuations of the local transverse magnetization of

the condensate. We demonstrate that these fluctuations are much more pronounced

for the antiferromagnetic state than for the ferromagnetic one.

\\ ( http://arXiv.org/abs/cond-mat/0602119 , 42kb)

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Paper: cond-mat/0602123

Date: Mon, 6 Feb 2006 10:20:41 GMT (8kb)

Title: Kinetic energy of Bose systems and variation of statistical averages

Authors: V.I. Yukalov

Comments: Latex, 11 pages

Subj-class: Statistical Mechanics

Journal-ref: Laser Phys. Lett. 3 (2006) 106-111

\\

The problem of defining the average kinetic energy of statistical systems is

addressed. The conditions of applicability for the formula, relating the

average kinetic energy with the mass derivative of the internal energy, are

analysed. It is shown that incorrectly using this formula, outside its region

of validity, leads to paradoxes. An equation is found for a parametric

derivative of the average for an arbitrary operator. A special attention is

paid to the mass derivative of the internal energy, for which a general formula

is derived, without invoking the adiabatic approximation and taking into

account the mass dependence of the potential-energy operator. The results are

illustrated by the case of a low-temperature dilute Bose gas.

\\ ( http://arXiv.org/abs/cond-mat/0602123 , 8kb)

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Paper: cond-mat/0506368

replaced with revised version Mon, 6 Feb 2006 15:23:19 GMT (20kb)

Title: Stability of quasi-two-dimensional Bose-Einstein condensates with

dominant dipole-dipole interactions

Authors: Uwe R. Fischer

Comments: 4 pages of RevTex4, 3 figures; Rapid Communication in Physical Review

A (to be published)

Subj-class: Other

\\ ( http://arXiv.org/abs/cond-mat/0506368 , 20kb)

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Paper: cond-mat/0507506

replaced with revised version Sat, 4 Feb 2006 14:34:32 GMT (469kb)

Title: Collision-Dependent Atom Tunnelling Rate in Bose-Einstein Condensates

Authors: B. R. da Cunha and M. C. de Oliveira

Comments: 4 pages, 2 figures. Replaced with improved version

Subj-class: Other

\\ ( http://arXiv.org/abs/cond-mat/0507506 , 469kb)

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Paper: cond-mat/0602048

replaced with revised version Mon, 6 Feb 2006 15:46:58 GMT (166kb)

Title: Coherent transport of cold atoms in angle-tuned optical lattices

Authors: Roberto Franzosi, Matteo Cristiani, Carlo Sias, Ennio Arimondo

Comments: 7 pages, 5 figures, one reference added

Subj-class: Other

\\ ( http://arXiv.org/abs/cond-mat/0602048 , 166kb)

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Paper: quant-ph/0602054

Date: Sat, 4 Feb 2006 14:55:34 GMT (121kb)

Title: Optimal Conditions for Atomic Homodyne Detection on Bose-Einstein

Condensates

Authors: B. R. da Cunha and M. C. de Oliveira

Comments: 9 pages, 5 figures

\\

The dynamics of a two-mode Bose-Einstein condensate trapped in a double-well

potential results approximately in an effective Rabi oscillation regime of

exchange of population between both wells for sufficiently strong overlap

between the modes functions. Facing this system as a temporal atomic beam

splitter we show that this regime is optimal for a nondestructive atom-number

measurement allowing an atomic homodyne detection, thus yielding indirect

relative phase information about one of the two-mode condensates.

\\ ( http://arXiv.org/abs/quant-ph/0602054 , 121kb)

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Paper: physics/0511239

replaced with revised version Mon, 6 Feb 2006 19:11:46 GMT (294kb)

Title: Coupled dynamics of atoms and radiation pressure driven interferometers

Authors: D. Meiser and P. Meystre

Comments: 11 pages; 13 figures; two added references and other minor

corrections

Subj-class: Atomic Physics; Optics; Other

\\ ( http://arXiv.org/abs/physics/0511239 , 294kb)

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Paper: cond-mat/0602157

Date: Mon, 6 Feb 2006 23:02:59 GMT (554kb)

Title: Nonzero orbital angular momentum superfluidity in ultracold Fermi gases

Authors: M. Iskin and C. A. R. S{\'a} de Melo

Comments: 28 pages and 24 figures

Subj-class: Superconductivity; Other

\\

We analyze the evolution of superfluidity for nonzero orbital angular

momentum channels from the Bardeen-Cooper-Schrieffer (BCS) to the Bose-Einstein

condensation (BEC) limit in three dimensions. First, we analyze the low energy

scattering properties of finite range interactions for all possible angular

momentum channels. Second, we discuss ground state ($T = 0$) superfluid

properties including the order parameter, chemical potential, quasiparticle

excitation spectrum, momentum distribution, atomic compressibility, ground

state energy and low energy collective excitations. We show that a quantum

phase transition occurs for nonzero angular momentum pairing, unlike the s-wave

case where the BCS to BEC evolution is just a crossover. Third, we present a

gaussian fluctuation theory near the critical temperature ($T = T_{\rm c}$),

and we analyze the number of bound, scattering and unbound fermions as well as

the chemical potential. Finally, we derive the time-dependent Ginzburg-Landau

functional near $T_{\rm c}$, and compare the Ginzburg-Landau coherence length

with the zero temperature average Cooper pair size.

\\ ( http://arXiv.org/abs/cond-mat/0602157 , 554kb)

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Paper: cond-mat/0602162

Date: Tue, 7 Feb 2006 02:33:07 GMT (373kb)

Title: The stochastic Gross-Pitaevskii equation: III

Authors: A. S. Bradley and C. W. Gardiner

Comments: 25 pages, 2 figures, J. Phys. B. style

Subj-class: Other

\\

A generalised stochastic Gross-Pitaevskii equation describing a partially

condensed trapped Bose gas with rotating thermal component is presented. We

elucidate the manner in which the rotation changes the role of the high energy

cutoff and introduces centrifugal effects in the classical field evolution. The

rotation of the cloud means that Bose-enhanced collision processes occur

preferentially into states with the same angular momentum as the thermal cloud,

thus favouring vortex formation. We use the formalism to obtain a first

principles theory of vortex lattice formation caused by thermodynamic

instability.

\\ ( http://arXiv.org/abs/cond-mat/0602162 , 373kb)

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Paper: cond-mat/0602163

Date: Tue, 7 Feb 2006 15:02:27 GMT (24kb)

Title: A Tonks Giradeau Gas in the Presence of a Local Potential

Authors: Hao Fu, A. G. Rojo

Comments: 14 pages, 5 figures

Subj-class: Other

\\

The physics of a Tonks-Giradeau Gas in the presence of a local potential is

studied. In order to evaluate the single particle density matrix (SPDM) of the

many-body ground state, the Wiger-Jordan transformation is used. The

eigenvector with the largest eigenvalue of the SPDM corresponds to the

"Bose-Einstein Condensate"(BEC) State. We find that the "BEC" state density at

the positon of the local potential decreases, as expected, in the case of a

repulsive potential. For an attractive potential, it decreases or increases

depending on the strength of the potential. The superfluidity of this system is

investigated both numerically and perturbatively. An experimental method for

detecting the effect of an impurity in a Tonks-Giradueau gas is discussed.

\\ ( http://arXiv.org/abs/cond-mat/0602163 , 24kb)

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Paper: cond-mat/0602191

Date: Tue, 7 Feb 2006 20:25:03 GMT (640kb)

Title: Stability of trapped fermionic gases with attractive interactions

Authors: Benjamin M. Fregoso and Gordon Baym

Comments: 5 pages, 4 figures

Subj-class: Other; Statistical Mechanics

\\

We present a unified overview, from the mean-field to the unitarity regime,

of the stability of a trapped Fermi gas with short range attractive

interactions. Unlike in a system of bosons, a Fermi gas is always stable in

these regimes, no matter how large the particle number. However, when the

interparticle spacing becomes comparable to the range of the interatomic

interactions, instability is not precluded.

\\ ( http://arXiv.org/abs/cond-mat/0602191 , 640kb)

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Paper: cond-mat/0311012

replaced with revised version Tue, 7 Feb 2006 14:00:46 GMT (147kb)

Title: Interaction broadening of Wannier functions and Mott transitions in

atomic BEC

Authors: Jinbin Li, Yue Yu, Artem M. Dudarev, Qian Niu

Comments: A co-author(AMD) added, paper lengthened (7 pages, 8 figures now) to

extend the description of the method and add discussion of its validity

Subj-class: Soft Condensed Matter; Statistical Mechanics

\\ ( http://arXiv.org/abs/cond-mat/0311012 , 147kb)

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Paper: quant-ph/0512061

replaced with revised version Tue, 7 Feb 2006 16:16:23 GMT (178kb)

Title: Highly versatile atomic micro traps generated by multifrequency magnetic

field modulation

Authors: Ph.W. Courteille, B. Deh, J. Fort\'agh, A. G\"unther, S. Kraft, C.

Marzok, S. Slama, and C. Zimmermann

Comments: 12 pages, 6 figures

\\ ( http://arXiv.org/abs/quant-ph/0512061 , 178kb)

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Paper: cond-mat/0602201

Date: Wed, 8 Feb 2006 09:26:39 GMT (29kb)

Title: Strong coupling theory for the superfluidity of Bose-Fermi mixtures

Authors: Daw-Wei Wang

Comments: 5 pages and 3 figures

Subj-class: Other; Superconductivity

\\

We develop the strong coupling theory for the superfluidity of fermion s-wave

pairing state in a Bose-Fermi mixture. Dynamical screening, self-energy

renormalization, and pairing gap function are included self-consistently in the

regime where the phonon velocity is smaller than the Fermi velocity. Analytical

form for the transition temperature ($T_c$) is derived within reasonable

approximations. In typical $^{40}$K-$^{87}$Rb mixtures, the obtained $T_c$ is

several times larger than that in the weak coupling theory and can be as high

as several percents of Fermi temperature.

\\ ( http://arXiv.org/abs/cond-mat/0602201 , 29kb)

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Paper: cond-mat/0602210

Date: Wed, 8 Feb 2006 16:41:02 GMT (350kb)

Title: RF Controllable Ioffe-Pritchard Trap

Authors: G.A. Kouzaev, K.J. Sand

Comments: 7 pages 3 figures

Subj-class: Other

\\

An Ioffe-Pritchard trap for cold dressed atoms is studied by analytical and

numerical simulations. The effective potential in this trap is formed by the

static magnetic and radio-frequency fields, and the minimums are formed around

the current bars. The depth of the minimums and the overall topology of the

effective potential are controlled electronically. The studied regime of the

Ioffe-Pritchard trap is of interest for high-sensitive cold atom

interferometers.

\\ ( http://arXiv.org/abs/cond-mat/0602210 , 350kb)

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Paper: cond-mat/0506142

replaced with revised version Tue, 7 Feb 2006 23:42:12 GMT (750kb)

Title: A large magnetic storage ring for Bose-Einstein condensates

Authors: A. S. Arnold, C. S. Garvie, E. Riis

Comments: 4 pages, 5 figures

Subj-class: Other

\\ ( http://arXiv.org/abs/cond-mat/0506142 , 750kb)

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Paper: cond-mat/0512294

replaced with revised version Wed, 8 Feb 2006 08:14:23 GMT (21kb)

Title: Goldstone Theorem, Hugenholtz-Pines Theorem and Ward-Takahashi Relation

in Finite Volume Bose-Einstein Condensed Gases

Authors: Hiroaki Enomoto, Masahiko Okumura and Yoshiya Yamanaka

Comments: Accepted for publication in Ann. Phys., 33pages

Subj-class: Strongly Correlated Electrons

\\ ( http://arXiv.org/abs/cond-mat/0512294 , 21kb)

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Paper: cond-mat/0509766

Date: Thu, 29 Sep 2005 12:01:07 GMT (186kb)

Date (revised v2): Mon, 16 Jan 2006 14:41:38 GMT (186kb)

Title: Filled Landau levels in neutral quantum gases

Authors: P. Ohberg, G. Juzeliunas, J. Ruseckas and M. Fleischhauer

Comments: Minor corrections. Phys. Rev. A, 053632 (2005). High resolution

figures can be obtained from the authors

Subj-class: Mesoscopic Systems and Quantum Hall Effect

\\

We consider the signatures of the Integer Quantum Hall Effect in a degenerate

gas of electrically neutral atomic fermions. An effective magnetic field is

achieved by applying two incident light beams with a high orbital angular

momentum. We show how states corresponding to completely filled Landau levels

are obtained and discuss various possibilities to measure the incompressible

nature of the trapped two-dimensional gas

\\ ( http://arXiv.org/abs/cond-mat/0509766 , 186kb)

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Paper: quant-ph/0510173

replaced with revised version Wed, 8 Feb 2006 19:31:59 GMT (192kb)

Title: Unconditional two-mode squeezing of separated atomic ensembles

Authors: A.S. Parkins, E. Solano, J.I. Cirac

Comments: 4 pages, 2 figures

Journal-ref: Phys. Rev. Lett. 96, 053602 (2006)

\\ ( http://arXiv.org/abs/quant-ph/0510173 , 192kb)

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Paper: cond-mat/0602224

Date: Thu, 9 Feb 2006 00:44:34 GMT (61kb)

Title: Critical Temperature and Thermodynamics of Attractive Fermions at

Unitarity

Authors: Evgeni Burovski, Nikolay Prokof'ev, Boris Svistunov, and Matthias

Troyer

Comments: 4 pages, 4 figures

Subj-class: Statistical Mechanics; Superconductivity

\\

The unitarity regime of the BCS-BEC crossover can be realized by diluting a

system of two-component lattice fermions with an on-site attractive

interaction. We perform a systematic-error-free finite-temperature simulations

of this system by diagrammatic determinant Monte Carlo. The critical

temperature in units of Fermi energy is found to be T_c / E_F = 0.152(7). We

also report the behavior of the thermodynamic functions, and discuss the issues

of thermometry of ultracold Fermi gases.

\\ ( http://arXiv.org/abs/cond-mat/0602224 , 61kb)

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Paper: cond-mat/0602240

Date: Thu, 9 Feb 2006 19:33:12 GMT (153kb)

Title: Bragg spectroscopy of trapped one dimensional strongly interacting

bosons in optical lattices: Probing the cake-structure

Authors: Guido Pupillo, Ana Maria Rey and G. G. Batrouni

Comments: 6 pages, 4 figures

Subj-class: Other

\\

We study Bragg spectroscopy of strongly interacting one dimensional bosons

loaded in an optical lattice plus an additional parabolic potential. We

calculate the dynamic structure factor by using Monte Carlo simulations for the

Bose-Hubbard Hamiltonian, exact diagonalizations and the results of a recently

introduced effective fermionization (EF) model. We find that, due to the

system's inhomogeneity, the excitation spectrum exhibits a multi-branched

structure, whose origin is related to the presence of superfluid regions with

different densities in the atomic distribution. We thus suggest that Bragg

spectroscopy in the linear regime can be used as an experimental tool to unveil

the shell structure of alternating Mott insulator and superfluid phases

characteristic of trapped bosons.

\\ ( http://arXiv.org/abs/cond-mat/0602240 , 153kb)

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Paper: quant-ph/0602081

Date: Wed, 8 Feb 2006 23:26:28 GMT (54kb)

Title: Diffusion Resonances in the atom optics kicked rotor: Experimental

values for small kick numbers

Authors: S.A. Wayper, W. Simpson and M.D. Hoogerland

Comments: 6 pages, 4 figures

\\

We experimentally verify the analytical expressions that exist for the

diffusion rate in the quantum delta kicked rotor system for small numbers of

kicks. We show development of diffusion resonances from two to five kicks, and

of multiple resonances for high kick strengths. Furthermore, we show that, in

contrast to classical predictions, the results are purely periodic in the kick

period, and reproduce the predicted quantum- and diffusion resonances.

\\ ( http://arXiv.org/abs/quant-ph/0602081 , 54kb)

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Paper: physics/0602059

Date: Thu, 9 Feb 2006 03:16:27 GMT (117kb)

Title: High resolution atomic coherent control via spectral phase manipulation

of an optical frequency comb

Authors: Matthew C. Stowe, Flavio C. Cruz, and Jun Ye

Comments: 4 pages, 5 figures

Subj-class: Atomic Physics; Optics

\\

We demonstrate high resolution coherent control of cold atomic Rubidium

utilizing spectral phase manipulation of a femtosecond optical frequency comb.

Transient coherent accumulation is directly manifested by the enhancement of

signal amplitude and spectral resolution via the pulse number. The combination

of frequency comb technology and spectral phase manipulation enables coherent

control techniques to enter a new regime with natural linewidth resolutions.

\\ ( http://arXiv.org/abs/physics/0602059 , 117kb)

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-- ------------------------------------------------------------------------- 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/ -------------------------------------------------------------------------Received on Mon Feb 13 2006 - 10:51:41 EST

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