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

Date: Tue, 08 Apr 2008 08:05:36 +1000

Date: Tue, 08 Apr 2008 08:05:36 +1000

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

A total of 40 new preprints and 12 replacements this week.

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arXiv:0803.4007

Date: Thu, 27 Mar 2008 20:26:28 GMT (243kb)

Title: Prospects for cooling nanomechanical motion by coupling to a

superconducting microwave resonator

Authors: J. D. Teufel, C. A. Regal, K. W. Lehnert

Categories: cond-mat.mes-hall

Comments: 6 pages, 6 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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Recent theoretical work has shown that radiation pressure effects can in

principle cool a mechanical degree of freedom to its ground state. In this

paper, we apply this theory to our realization of an opto-mechanical system in

which the motion of mechanical oscillator modulates the resonance frequency of

a superconducting microwave circuit. We present experimental data demonstrating

the large mechanical quality factors possible with metallic, nanomechanical

beams at 20 mK. Further measurements also show damping and cooling effects on

the mechanical oscillator due to the microwave radiation field. These data

motivate the prospects for employing this dynamical backaction technique to

cool a mechanical mode entirely to its quantum ground state.

\\ ( http://arxiv.org/abs/0803.4007 , 243kb)

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arXiv:0803.4048

Date: Fri, 28 Mar 2008 05:54:19 GMT (512kb)

Title: Macroscopic quantum self-trapping in a Bose-Josephson junction with

fermions

Authors: S. F. Caballero Benitez, E. A. Ostrovskaya, M. Gulacsi, and Yu. S.

Kivshar

Categories: cond-mat.other

Comments: 8 pages, 8 figures, submitted to PRA

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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We study the macroscopic quantum self-trapping effect in a mixture of

Bose-Einstein condensate and a large number of quantum degenerate fermions,

trapped in a double-well potential with a variable separation between the

wells. The large number of fermions localized in each well form quasi-static

impurities that affect the dynamics of the bosonic cloud. Our semi-analytical

analysis based on a mean-field model shows that main features of macroscopic

quantum self trapping in a pure bosonic system are radically modified by the

influence of fermions, with both the onset of self-trapping and properties of

the self-trapped state depending on the fermion concentration as well as on the

type of inter-species interaction. Remarkably, repulsive inter-species

interaction leads to population inversion of the bosonic energy levels in the

trapping potential and hence to the inversion of symmetry of the macroscopic

wavefunction. Realistic physical estimates are given based on experimental

parameters for a $^{40}$K-$^{87}$Rb system.

\\ ( http://arxiv.org/abs/0803.4048 , 512kb)

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arXiv:0803.4052

Date: Fri, 28 Mar 2008 06:30:13 GMT (12kb)

Title: Universal Thermodynamics and Chandrasekhar-Clogston Limit of a Unitary

Fermi Gas

Authors: Lianyi He and Pengfei Zhuang

Categories: cond-mat.supr-con

Comments: 4 pages

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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The critical Zeeman fields and polarization of Fermi superfluidity at

infinite scattering length is studied based on the universality hypothesis.

Taking a general equation of state with some universal coefficients and a

scaling function which can be determined by experiment or Monte Carlo

simulation, we obtain model-independent lower and upper critical fields

$h_{c1}$ and $h_{c2}$ as well as the critical polarization $P_c$. Phase

separation is proven to be the energetically favored ground state between

$h_{c1}$ and $h_{c2}$. Using recent Monte Carlo result of $P_c$, $h_{c1}$ and

$h_{c2}$ are numerically determined.

\\ ( http://arxiv.org/abs/0803.4052 , 12kb)

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arXiv:0803.4067

Date: Fri, 28 Mar 2008 11:16:03 GMT (16kb)

Title: Improving Carnot efficiency with quantum correlations

Authors: Raoul Dillenschneider and Eric Lutz

Categories: cond-mat.stat-mech

Comments: 4 pages, 2 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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We consider a quantum Carnot engine that consists of a single-mode radiation

field in a resonating optical cavity. We show that the quantum efficiency can

exceed the classical Carnot limit when the engine is coupled to a reservoir of

thermal entangled two-level atoms. In the limit of small quantum correlations,

we express the Carnot efficiency in terms of the quantum discord, a measure of

nonclassical correlations. We thus establish that quantum correlated states can

be used as a valuable resource in quantum thermodynamics.

\\ ( http://arxiv.org/abs/0803.4067 , 16kb)

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arXiv:0803.4078

Date: Fri, 28 Mar 2008 09:45:31 GMT (788kb)

Title: Collisions between tunable halo dimers: exploring an elementary

four-body process with identical bosons

Authors: F. Ferlaino, S. Knoop, M. Mark, M. Berninger, H. Sch\"obel, H.-C.

N\"agerl, and R. Grimm

Categories: cond-mat.other

Comments: 4 pages, 4 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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We study inelastic collisions in a pure, trapped sample of Feshbach molecules

made of bosonic cesium atoms in the quantum halo regime. We measure the

relaxation rate coefficient for decay to lower-lying molecular states and study

the dependence on scattering length and temperature. We identify a pronounced

loss minimum with varying scattering length along with a further suppression of

loss with decreasing temperature. Our observations provide insight into the

physics of a few-body quantum system that consists of four identical bosons at

large values of the two-body scattering length.

\\ ( http://arxiv.org/abs/0803.4078 , 788kb)

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arXiv:0803.4116

Date: Fri, 28 Mar 2008 13:43:34 GMT (515kb)

Title: Dipole Oscillations of a Bose-Einstein Condensate in Presence of Defects

and Disorder

Authors: M. Albert, T. Paul, N. Pavloff, P. Leboeuf

Categories: cond-mat.other

Comments: 4 pages, 4 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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We consider dipole oscillations of a trapped dilute Bose-Einstein condensate

in the presence of a scattering potential consisting either in a localized

defect or in an extended disordered potential. In both cases the breaking of

superfluidity and the damping of the oscillations are shown to be related to

the appearance of a nonlinear dissipative flow. At supersonic velocities the

flow becomes asymptotically dissipationless.

\\ ( http://arxiv.org/abs/0803.4116 , 515kb)

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arXiv:0803.4174

Date: Fri, 28 Mar 2008 17:43:00 GMT (36kb)

Title: Universal and nonuniversal contributions to block-block entanglement in

many-fermion systems

Authors: Vivian V. Franca and Klaus Capelle

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

Comments: 6 pages, 3 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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We calculate the entanglement entropy of blocks of size x embedded in a

larger system of size L, by means of a combination of analytical and numerical

techniques. The complete entanglement entropy in this case is a sum of three

terms. One is a universal x and L-dependent term, first predicted by Calabrese

and Cardy, the second is a nonuniversal term arising from the thermodynamic

limit, and the third is a finite size correction. We give an explicit

expression for the second, nonuniversal, term for the one-dimensional Hubbard

model, and numerically assess the importance of all three contributions by

comparing to the entropy obtained from fully numerical diagonalization of the

many-body Hamiltonian. We find that finite-size corrections are very small. The

universal Calabrese-Cardy term is equally small for small blocks, but becomes

larger for x>1. In all investigated situations, however, the by far dominating

contribution is the nonuniversal term steming from the thermodynamic limit.

\\ ( http://arxiv.org/abs/0803.4174 , 36kb)

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arXiv:0803.1463 (*cross-listing*)

Date: Mon, 10 Mar 2008 19:52:50 GMT (19kb)

Title: Preparation of Entangled States by Dissipative Quantum Markov Processes

Authors: B. Kraus, S. Diehl, A. Micheli, A. Kantian, H. P. B\"uchler, and P.

Zoller

Categories: quant-ph cond-mat.other

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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We investigate the possibility of using a dissipative process to prepare a

quantum system in a desired state. We derive for any multipartite pure state a

dissipative process for which this state is the unique stationary state.

Furthermore we solve the corresponding master equation analytically, which

allows us to compute, for instance, the relaxation time of the dissipative

process. For certain states, like the 2D--Cluster states, it is shown that the

jump operators can be chosen quasi--locally, i.e. they act non--trivially only

on a few, neighboring qubits. We demonstrate the general formalism by

considering arbitrary MPS--PEPS states.

\\ ( http://arxiv.org/abs/0803.1463 , 19kb)

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arXiv:0803.4069

Date: Fri, 28 Mar 2008 09:22:59 GMT (534kb,D)

Title: Engineering the quantum transport of atomic wavefunctions over

macroscopic distances

Authors: A. Alberti, V. V. Ivanov, G. M. Tino and G. Ferrari

Categories: quant-ph

Comments: 5 pages, 5 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

The manipulation of matterwave represents a milestone in the history of

quantum mechanics. It was at the basis of its experimental validation through

the observation of diffraction of matter on crystals, as well as grating and

Young's double-slit interference with electrons, neutron, atoms and molecules.

More recently matterwave manipulation has become a building block in the

implementation of quantum devices such as quantum sensors and it plays an

essential role in many proposals for implementing quantum computers. In this

letter we coherently control the spatial extent of the wavefunction by

reversibly stretching and shrinking the wavefunction over a millimeter

distance. The remarkable experimental simplicity of the scheme would ease

applications in the field of quantum transport and quantum computing.

\\ ( http://arxiv.org/abs/0803.4069 , 534kb)

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arXiv:0803.4158

Date: Fri, 28 Mar 2008 16:27:30 GMT (9kb)

Title: Symplectic tomography of ultracold gases in tight-waveguides

Authors: A. del Campo, V. I. Man'ko, G. Marmo

Categories: quant-ph

Comments: 5 pages, no figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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The phase space is the natural ground to smoothly extrapolate between local

and non-local correlation functions. With this objective, we introduce the

symplectic tomography of many-body quantum gases in tight-waveguides, and

concentrate on the reduced single-particle symplectic tomogram (RSPST) whose

marginals are the density profile and momentum distribution. We present an

operational approach to measure the RSPST from the time evolution of the

density profile after shutting off the interactions in a variety of relevant

situations: free expansion, fall under gravity, and oscillations in a harmonic

trap. From the RSPST, the one-body density matrix of the trapped state can be

reconstructed.

\\ ( http://arxiv.org/abs/0803.4158 , 9kb)

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arXiv:0803.4189

Date: Fri, 28 Mar 2008 19:26:33 GMT (141kb,D)

Title: Atomic Zitterbewegung

Authors: M. Merkl, F. E. Zimmer, G. Juzeliunas, P. \"Ohberg

Categories: quant-ph

Comments: 6 pages, 4 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

Ultra-cold atoms which are subject to ultra-relativistic dynamics are

investigated. By using optically induced gauge potentials we show that the

dynamics of the atoms is governed by a Dirac type equation. To illustrate this

we study the trembling motion of the centre of mass for an effective two level

system, historically called Zitterbewegung. Its origin is described in detail,

where in particular the role of the finite width of the atomic wave packets is

seen to induce a damping of both the centre of mass dynamics and the dynamics

of the populations of the two levels.

\\ ( http://arxiv.org/abs/0803.4189 , 141kb)

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arXiv:0803.4153

Date: Fri, 28 Mar 2008 15:48:43 GMT (641kb)

Title: Demonstration of perfect coherence preservation for matter-waves

perturbed by a delta-kicked rotor

Authors: A. Tonyushkin, S. Wu, and M. Prentiss

Categories: physics.atom-ph

Comments: 5 pages, 5 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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We demonstrate perfect coherence preservation in an atom interferometer

perturbed by optical standing wave pulses acting as a kicked rotor. In our

experiment we subject a cloud of cold rubidium atoms in a magnetic guide to

periodic kicks from a sinusoidal potential created by standing wave pulses of

off-resonant laser light propagating along the guiding direction. While, in

general, we observed a strong decoherence of matter-waves due to applied

perturbations the coherence is perfectly preserved for the conditions similar

but not limited to quantum resonances of the quantum kicked rotor. Moreover,

these conditions do not depend on the number of kicks applied or require any

regularity in the pulse strengths. We show that the narrowing of the width of

coherence revival as a function of increasing kick number provides a new method

for precise measurement of recoil frequency.

\\ ( http://arxiv.org/abs/0803.4153 , 641kb)

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arXiv:0803.4058

Date: Fri, 28 Mar 2008 08:11:02 GMT (20kb)

Title: Crime and punishment in scientific research

Authors: Mathieu Bouville

Categories: physics.soc-ph physics.hist-ph

Comments: 10 pages, 2 tables

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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Arguments against scientific misconduct one finds in the literature generally

fail to support current policies on research fraud: they may not prove wrong

what is typically considered research misconduct and they tend to make wrong

things that are not usually seen as scientific fraud, in particular honest

errors. I argue that society cannot set a rule enjoining scientists to be

honest, so any such rule can only be internal to science. Therefore society

cannot legitimately enforce it. Moreover, until an argument is provided to

prove that lack of honesty is far worse than lack of technical competence,

intentional deceit should not be punished much more harshly than technical

errors.

Keywords: cheating; ethics; fabrication; falsification; integrity;

plagiarism; research fraud; scientific misconduct.

\\ ( http://arxiv.org/abs/0803.4058 , 20kb)

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arXiv:0803.4221

Date: Fri, 28 Mar 2008 22:36:55 GMT (43kb)

Title: Small mass- and trap-imbalanced two-component Fermi systems

Authors: D. Blume

Categories: cond-mat.other

Comments: 13 pages, 9 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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Motivated by the prospect of optical lattice experiments with two-component

Fermi gases consisting of different atomic species such as Li and K, we

calculate the energies for N fermions under harmonic confinement as a function

of the mass- and trap-imbalance, i.e., as a function of the ratio between the

masses and frequencies of species one and two, using microscopic approaches.

Our energies for N=2 through 6 can be used to determine the energetically most

favorable configuration for a given number of atoms per species of a deep

lattice in which each lattice site is approximately harmonic and in which

tunneling between neighboring sites can be neglected. Furthermore, our energies

determine one of the input parameters, namely the onsite interaction strength,

of the corresponding lattice Hamiltonian. We also determine and interpret the

excitation gap for unequal-mass systems with up to N=13 atoms for equal

oscillator lengths.

\\ ( http://arxiv.org/abs/0803.4221 , 43kb)

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arXiv:0803.4347

Date: Sun, 30 Mar 2008 21:01:28 GMT (287kb)

Title: Multiband-Driven Superfluid-Insulator Transition of Fermionic Atoms in

Optical Lattices: A Dynamical Mean-Field-Theory Study

Authors: Takuji Higashiyama, Kensuke Inaba, and Sei-ichiro Suga

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

Comments: 4 pages, 3 figures, to appear in Phys. Rev. A

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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The superfluid-insulator transitions of the fermionic atoms in optical

lattices are investigated by the two-site dynamical mean-field theory. It is

shown that the Mott transition occurs as a result of the multiband effects. The

quasiparticle weight in the superfluid state decreases significantly, as the

system approaches the Mott transition point. By changing the interaction and

the orbital splitting, we obtain the phase diagram at half filling. The

numerical results are discussed in comparison with the effective boson model.

\\ ( http://arxiv.org/abs/0803.4347 , 287kb)

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arXiv:0803.4385

Date: Mon, 31 Mar 2008 11:04:52 GMT (157kb)

Title: Three-dimensional correlated-fermion phase separation from analysis of

the geometric mean of the individual susceptibilities

Authors: Ji-sheng Chen, Fang Qin, and Yan-ping Wang

Categories: cond-mat.stat-mech

Comments: 4 pages, 5 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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A quasi-Gaussian approximation scheme is formulated for the strongly

correlated imbalanced fermions thermodynamics, where the mean-field theory is

not applicable. The non-Gaussian correlation effects are understood to be

captured by the statistical geometric mean of the individual susceptibilities.

In the three-dimensional unitary fermions ground state, a {\em universal}

nonlinear scaling transformation relates the physical chemical potentials with

the individual Fermi kinetic energies. For the partial polarization phase

separation to full polarization, the calculated critical polarization ratio is

$P_C={[1-(1-\xi)^{6/5}]}/{[1+(1-\xi)^{6/5}]}\doteq 0.34$. It agrees with the

Monte Carlo calculations and experimental measurements very well.

\\ ( http://arxiv.org/abs/0803.4385 , 157kb)

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arXiv:0803.4419

Date: Mon, 31 Mar 2008 10:05:55 GMT (91kb)

Title: The role of interactions in spin-polarised atomic Fermi gases at

unitarity

Authors: A. Recati, C. Lobo, S. Stringari

Categories: cond-mat.other

Comments: 6 pages, 2 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We study the zero temperature properties of a trapped polarized Fermi gas at

unitarity by assuming phase separation between an unpolarized superfluid and a

polarized normal phase. The effects of the interaction are accounted using the

formalism of quasi-particles to build up the equation of state of the normal

phase with the Monte Carlo results for the relevant parameters. Our predictions

for the Chandrasekhar-Clogston limit of critical polarization and for the

density profiles, including the density jump at the interface, are confirmed

with excellent accuracy by the recent experimental results at MIT. The role of

interaction on the radial width of the minority component, on the gap of the RF

transition and on the spin oscillations in the normal phase is also discussed.

Our analysis points out the Fermi liquid nature of these strongly interacting

spin polarized configurations.

\\ ( http://arxiv.org/abs/0803.4419 , 91kb)

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arXiv:0803.0890 (*cross-listing*)

Date: Thu, 6 Mar 2008 15:29:45 GMT (342kb)

Date (revised v2): Mon, 31 Mar 2008 18:10:38 GMT (342kb)

Title: Locality of dynamics in general harmonic quantum systems

Authors: M. Cramer, A. Serafini, J. Eisert

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

Comments: 19 pages latex, contribution to proceedings of "Quantum Information

and Many-Body Quantum Systems" Workshop, 26-31 Mar 2007, Pisa. (v2) minor

changes

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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The Lieb-Robinson theorem states that locality is approximately preserved in

the dynamics of quantum lattice systems. Whenever one has finite-dimensional

constituents, observables evolving in time under a local Hamiltonian will

essentially grow linearly in their support, up to exponentially suppressed

corrections. In this work, we formulate Lieb-Robinson bounds for general

harmonic systems on general lattices, for which the constituents are

infinite-dimensional, as systems representing discrete versions of free fields

or the harmonic approximation to the Bose-Hubbard model. We consider both local

interactions as well as infinite-ranged interactions, showing how corrections

to locality are inherited from the locality of the Hamiltonian: Local

interactions result in stronger than exponentially suppressed corrections,

while non-local algebraic interactions result in algebraic suppression. We

derive bounds for canonical operators, Weyl operators and outline

generalization to arbitrary operators. As an example, we discuss the

Klein-Gordon field, and see how the approximate locality in the lattice model

becomes the exact causality in the field limit. We discuss the applicability of

these results to quenched lattice systems far from equilibrium, and the

dynamics of quantum phase transitions.

\\ ( http://arxiv.org/abs/0803.0890 , 342kb)

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arXiv:0803.4352

Date: Sun, 30 Mar 2008 22:06:57 GMT (279kb,D)

Title: Experimental observation of oscillating and interacting matter wave dark

solitons

Authors: A. Weller, J.P. Ronzheimer, C. Gross, D.J. Frantzeskakis, G.

Theocharis, P.G. Kevrekidis, J. Esteve, and M.K. Oberthaler

Categories: quant-ph

Comments: 5 pages, 3 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We report on the generation, subsequent oscillation and interaction of a pair

of matter wave dark solitons. These are created by releasing a Bose-Einstein

condensate from a double well potential into a harmonic trap in the crossover

regime between one dimension (1D) and three dimensions (3D). The oscillation of

the solitons is observed and the frequency is in quantitative agreement with

simulations using the Gross-Pitaevskii equation. An effective particle picture

is developed and reveals that the deviation of the observed frequencies from

the asymptotic prediction $\nu_{z}/\sqrt{2}$, where $\nu_{z}$ is the

longitudinal trapping frequency, results from the dimensionality of the system

and the interaction between the solitons.

\\ ( http://arxiv.org/abs/0803.4352 , 279kb)

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arXiv:0803.4276

Date: Sat, 29 Mar 2008 17:43:59 GMT (517kb)

Title: Gravito--magnetic trapping of $^{87}$Rb

Authors: A. Bertoldi and L. Ricci

Categories: physics.atom-ph

Comments: 3 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

Three--dimensional trapping of neutral atoms in a combined gravito--magnetic

potential is reported. Clouds of cold rubidium atoms in different hyperfine

states of the ground level were trapped with a lifetime of 4.5 s. Confinement

exclusively occured as a combination of the static magnetic force and the

gravitational force.

\\ ( http://arxiv.org/abs/0803.4276 , 517kb)

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arXiv:0803.4503

Date: Mon, 31 Mar 2008 17:23:11 GMT (109kb)

Title: Frequency evaluation of the doubly forbidden $^1S_0\to ^3P_0$ transition

in bosonic $^{174}$Yb

Authors: N. Poli, Z. W. Barber, N. D. Lemke, C. W. Oates, L. S. Ma, J. E.

Stalnaker, T. M. Fortier, S. A. Diddams, L. Hollberg, J. C. Bergquist, A.

Brusch, S. Jefferts, T. Heavner, T. Parker

Categories: physics.atom-ph physics.gen-ph

Comments: 4 pages, 3 figure -Submitted to PRA Rapid Communications

License: http://creativecommons.org/licenses/publicdomain/

\\

We report an uncertainty evaluation of an optical lattice clock based on the

$^1S_0\leftrightarrow^3P_0$ transition in the bosonic isotope $^{174}$Yb by use

of magnetically induced spectroscopy. The absolute frequency of the

$^1S_0\leftrightarrow^3P_0$ transition has been determined through comparisons

with optical and microwave standards at NIST. The weighted mean of the

evaluations is $\nu$($^{174}$Yb)=518 294 025 309 217.8(0.9) Hz. The uncertainty

due to systematic effects has been reduced to less than 0.8 Hz, which

represents $1.5\times10^{-15}$ in fractional frequency.

\\ ( http://arxiv.org/abs/0803.4503 , 109kb)

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arXiv:0804.0007

Date: Mon, 31 Mar 2008 20:00:32 GMT (970kb,D)

Title: Stochastic Mean-Field Theory for the Disordered Bose-Hubbard Model at

T=0

Authors: U. Bissbort, W. Hofstetter

Categories: cond-mat.dis-nn cond-mat.other

Comments: 4 pages, 5 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We investigate the effect of diagonal disorder on bosons in an optical

lattice described by an Anderson-Hubbard model at zero temperature. It is known

that within Gutzwiller mean-field theory spatially resolved calculations suffer

particularly from finite system sizes in the disordered case, while arithmetic

averaging of the order parameter cannot describe the Bose glass phase for

finite hopping $J>0$. Here we present and apply a new stochastic mean-field

theory which captures localization due to disorder, includes dimensional

effects and is applicable in the thermodynamic limit. In contrast to fermionic

systems, we find the existence of a critical hopping strength, above which the

system remains superfluid for arbitrarily strong disorder.

\\ ( http://arxiv.org/abs/0804.0007 , 970kb)

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arXiv:0804.0008

Date: Mon, 31 Mar 2008 20:00:54 GMT (453kb)

Title: Emergent complexity: what uphill analysis or downhill invention can not

do

Authors: Dante R. Chialvo

Categories: cond-mat.dis-nn q-bio.NC

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

In these notes we review emergent phenomena in complex systems, emphasizing

ways to identify potential underlying universal mechanisms that generates

complexity. The discussion is centered around the emergence of collective

behavior in dynamical systems when they are poised near a critical point of a

phase transition, either by tuning or by self-organization. We then argue the

rationale for our proposal that the brain is naturally poised near criticality

reviewing recent results as well as the implications of this view of the

functioning brain.

\\ ( http://arxiv.org/abs/0804.0008 , 453kb)

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arXiv:0804.0012

Date: Tue, 1 Apr 2008 00:29:43 GMT (57kb)

Title: Theory of ground state factorization in quantum cooperative systems

Authors: S. M. Giampaolo, G. Adesso, F. Illuminati

Categories: cond-mat.other

Comments: 4 pages, 1 figure

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We introduce a general analytic approach to the study of factorization points

and factorized ground states in quantum cooperative systems. The method allows

to determine rigorously existence, location, and exact form of separable ground

states in a large variety of, generally non-exactly solvable, spin models

belonging to different universality classes. The theory applies to

translationally invariant systems, irrespective of spatial dimensionality, and

for spin-spin interactions of arbitrary range.

\\ ( http://arxiv.org/abs/0804.0012 , 57kb)

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arXiv:0804.0035

Date: Mon, 31 Mar 2008 21:45:23 GMT (201kb)

Title: Towards r-space Bose-Einstein condensation of photonic crystal exciton

polaritons

Authors: D. L. Boiko

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

Comments: 6 pages, 4 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

Coupled states of semiconductor quantum well (QW) excitons and photons in a

two dimensional (2D) periodic lattice of microcavities are analyzed

theoretically, revealing allowed bands and forbidden gaps in the energy

spectrum of exciton polaritons. Photonic crystal exciton polaritons have

spatially uniform excitonic constituent set by flat QWs, but exhibit periodic

Bloch oscillations in the plane of QWs due to their photonic component. The

envelope functions of photonic crystal exciton polaritons can be tailored via

effective potential of a photonic crystal heterostructure, by using

quasi-periodic lattices of microcavities. Confined envelope function states of

lower and upper polaritons and the Bose-Einstein condensation of lower

polaritons are analyzed here in a photonic crystal heterostructure trap with

harmonic oscillator potential. This concept is numerically illustrated on

example of CdTe/CdMgTe microcavities.

\\ ( http://arxiv.org/abs/0804.0035 , 201kb)

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arXiv:0804.0060

Date: Tue, 1 Apr 2008 18:16:25 GMT (353kb)

Title: Fast, Runaway Evaporative Cooling to Bose-Einstein Condensation in

Optical Traps

Authors: Chen-Lung Hung, Xibo Zhang, Nathan Gemelke, Cheng Chin

Categories: cond-mat.other

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We demonstrate a simple scheme to achieve fast, runaway evaporative cooling

of optically trapped atoms by tilting the optical potential with a magnetic

field gradient. Runaway evaporation is possible in this trap geometry due to

the weak dependence of vibration frequencies on trap depth, which preserves

atomic density during the evaporation process. Using this scheme, we show that

Bose-Einstein condensation with ~10^5 cesium atoms can be realized in 2~4 s of

forced evaporation. The evaporation speed and energetics are consistent with

the three-dimensional evaporation picture, despite the fact that atoms can only

leave the trap in the direction of tilt.

\\ ( http://arxiv.org/abs/0804.0060 , 353kb)

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arXiv:0804.0191

Date: Tue, 1 Apr 2008 14:59:00 GMT (1000kb)

Title: Dipolar spinor Bose-Einstein condensates

Authors: Su Yi and Han Pu

Categories: cond-mat.other

Comments: 12 pages, 10 figures. A review on our recent work on dipolar spinor

BECs, to appear in the book "Electromagnetic, Magnetostatic and Exchange

Interaction Vortices in Confined Magnetic Structures"

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

Under many circumstances, the only important two-body interaction between

atoms in ultracold dilute atomic vapors is the short-ranged isotropic s-wave

collision. Recent studies have shown, however, that situations may arise where

the dipolar interaction between atomic magnetic or electric dipole moments can

play a significant role. The long-range anisotropic nature of the dipolar

interaction greatly enriches the static and dynamic properties of ultracold

atoms. In the case of dipolar spinor condensates, the interplay between the

dipolar interaction and the spin exchange interaction may lead to nontrivial

spin textures. Here we pay particular attention to the spin vortex state that

is analogous to the magnetic vortex found in thin magnetic films.

\\ ( http://arxiv.org/abs/0804.0191 , 1000kb)

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\\

arXiv:0804.0211

Date: Tue, 1 Apr 2008 16:50:52 GMT (868kb)

Title: Mesoscopic Phase Coherence in a Quantum Spin Fluid

Authors: Guangyong Xu, C. Brohol, Yeong-Ah Soh, G. Aeppli, J. F. DiTusa, Ying

Chen, M. Kenzelmann, C. D. Frost, T. Ito, K. Oka, H. Takagi

Categories: cond-mat.str-el

Journal-ref: Science 317, 1049 (2007)

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

Mesoscopic quantum phase coherence is important because it improves the

prospects for handling quantum degrees of freedom in technology. Here we show

that the development of such coherence can be monitored using magnetic neutron

scattering from a one-dimensional spin chain Y2BaNiO5, a quantum spin fluid

where no classical, static magnetic order is present. In the cleanest samples,

the quantum coherence length is 20 nm, almost an order of magnitude larger than

the classical antiferromagnetic correlation length of 3 nm. We also demonstrate

that the coherence length can be modified by static and thermally activated

defects in a quantitatively predictable manner.

\\ ( http://arxiv.org/abs/0804.0211 , 868kb)

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\\

arXiv:0804.0109

Date: Tue, 1 Apr 2008 08:41:52 GMT (212kb)

Title: Multiple Cold-Atom Lasers

Authors: William Guerin (INLN), Franck Michaud (INLN), Robin Kaiser (INLN)

Categories: physics.atom-ph physics.optics

Proxy: ccsd hal-00268718

\\

We realize a laser with a cloud of cold rubidium atoms as gain medium, placed

in a low-finesse cavity. Three different regimes of laser emission are observed

corresponding respectively to Mollow, Raman and Four Wave Mixing mechanisms. We

measure output power of up to 300 $\mu$W and present threshold and gain spectra

in each regime.

\\ ( http://arxiv.org/abs/0804.0109 , 212kb)

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\\

arXiv:0804.0234

Date: Tue, 1 Apr 2008 20:02:33 GMT (401kb)

Title: Fock-space quantum particle approach for the two-mode boson model

describing BEC trapped in a double-well potential

Authors: V. S. Shchesnovich and M. Trippenbach

Categories: cond-mat.other

Comments: 14 pages, 13 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We develop the Fock-space many-body quantum approach for large number of

bosons, when the bosons occupy significantly only few modes. The approach is

based on an analogy with the dynamics of a single particle of either positive

or negative mass in a quantum potential, where the inverse number of bosons

plays the role of Planck constant. As application of the method we consider the

Bose-Einstein condensate in a double-well trap. The ground state of positive

mass particle corresponds to the mean-field fixed point of lower energy, while

that of negative mass to the excited fixed point. In the case of attractive BEC

above the threshold for symmetry breaking, the ground state is a cat state and

we relate this fact to the double-well shape of the quantum potential for the

positive mass quantum particle. The tunneling energy splitting between the

local Fock states of the cat state is shown to be extremely small for the

nonlinearity parameter just above the critical value and exponentially

decreasing with the number of atoms. In the repulsive case, the phase locked

($\pi$-phase) macroscopic quantum self-trapping of BEC is related to the

double-well structure of the potential for the negative mass quantum particle.

We also analyze the running phase macroscopic quantum self-trapping state and

show that it is subject to quantum collapses and revivals. Moreover, the

quantum dynamics just before the first collapse of the running phase shows

exponential growth of dispersion of the quantum phase distribution which may

explain the growth of the phase fluctuations seen in the experiment on the

macroscopic quantum self-trapping.

\\ ( http://arxiv.org/abs/0804.0234 , 401kb)

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\\

arXiv:0804.0286

Date: Wed, 2 Apr 2008 04:19:11 GMT (402kb,D)

Title: Quasi-condensation and coherence in the quasi-two-dimensional trapped

Bose gas

Authors: R.N. Bisset, M.J. Davis, T.P. Simula, and P.B. Blakie

Categories: cond-mat.other

Comments: 4.1 pages, 4 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We simulate a trapped quasi-two-dimensional Bose gas using a classical field

method. To interpret our results we introduce two characteristic temperatures

determined from our simulations: the condensation temperature $T_{c}$ and the

uniform Berezinskii-Kosterlitz-Thouless (BKT) temperature $T_{BKT}$. We observe

that density fluctuations are suppressed in the system above $T_c$ as a

quasi-condensate forms as the first manifestation of degeneracy. At $T_c$ a

coherent condensate forms, which has a clear bimodal structure in momentum

space. At $T_{BKT}$ algebraic decay of off-diagonal correlations occurs near

the trap center when the peak density satisfies the uniform condition for the

BKT phase transition. Our results provide a comprehensive picture of the low

temperature phase diagram of the trapped quasi-2D Bose gas and a consistent

interpretation of recent experiments.

\\ ( http://arxiv.org/abs/0804.0286 , 402kb)

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\\

arXiv:0804.0355

Date: Wed, 2 Apr 2008 13:58:29 GMT (19kb)

Title: Pair-Breaking in Rotating Fermi Gases

Authors: Michael Urban and Peter Schuck

Categories: cond-mat.other

Comments: 4 pages, 2 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We study the pair-breaking effect of rotation on a cold Fermi gas in the

BCS-BEC crossover region. In the framework of BCS theory, which is supposed to

be qualitatively correct at zero temperature, we find that in a trap rotating

around a symmetry axis, three regions have to be distinguished: (A) a region

near the rotational axis where the superfluid stays at rest and where no pairs

are broken, (B) a region where the pairs are progressively broken with

increasing distance from the rotational axis, resulting in an increasing

rotational current, and (C) a normal-fluid region where all pairs are broken

and which rotates like a rigid body. Due to region B, density and current do

not exhibit any discontinuities.

\\ ( http://arxiv.org/abs/0804.0355 , 19kb)

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\\

arXiv:0804.0364

Date: Wed, 2 Apr 2008 14:35:33 GMT (108kb)

Title: Second order quantum phase transition of a homogeneous Bose gas with

attractive interactions

Authors: P. Zi\'n, B. Ole\'s, M. Trippenbach, and K. Sacha

Categories: cond-mat.other

Comments: 7 pages, 3 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We consider a homogeneous Bose gas of particles with an attractive

interaction. Mean field theory predicts for this system a spontaneous symmetry

breaking at a certain value of the interaction strength. We show that at this

point a second-order quantum phase transition occurs. We investigate the system

in the vicinity of the critical point using Bogoliubov theory and a continuous

description, that allows us to analyze {\it quantum fluctuations} in the system

even when the Bogoliubov approach breaks down.

\\ ( http://arxiv.org/abs/0804.0364 , 108kb)

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\\

arXiv:0804.0272

Date: Wed, 2 Apr 2008 00:16:03 GMT (412kb,D)

Title: Quantum computing using shortcuts through higher dimensions

Authors: B. P. Lanyon, M. Barbieri, M. P. Almeida, T. Jennewein, T. C. Ralph,

K. J. Resch, G. J. Pryde, J. L. O'Brien, A. Gilchrist and A. G. White

Categories: quant-ph

Comments: 7 pages, 6 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

Quantum computation offers the potential to solve fundamental yet otherwise

intractable problems across a range of active fields of research. Recently,

universal quantum-logic gate sets - the building blocks for a quantum computer

- have been demonstrated in several physical architectures. A serious obstacle

to a full-scale implementation is the sheer number of these gates required to

implement even small quantum algorithms. Here we present and demonstrate a

general technique that harnesses higher dimensions of quantum systems to

significantly reduce this number, allowing the construction of key quantum

circuits with existing technology. We are thereby able to present the first

implementation of two key quantum circuits: the three-qubit Toffoli and the

two-qubit controlled-unitary. The gates are realised in a linear optical

architecture, which would otherwise be absolutely infeasible with current

technology.

\\ ( http://arxiv.org/abs/0804.0272 , 412kb)

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\\

arXiv:0804.0367

Date: Wed, 2 Apr 2008 14:52:36 GMT (83kb)

Title: Quasi-analytical theory for the anomalous quantum reflection of

Bose-Einstein condensates

Authors: Alexander Jurisch and Jan-Michael Rost

Categories: quant-ph

Comments: 4 pages, 1 figure

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We develop a quasi-analytical theory for the anomalous quantum reflection

amplitude of Bose-Einstein condensates in the asymptotic time-domain. We derive

and calculate the decay-width of a Bose-Einstein condensate. A general relation

between the time-dependent decay-law of the system and its quantum reflection

amplitude allows us to explain the quantum reflection anomaly of Bose-Einstein

condensates present in BEC-surface systems as a direct consequence of the

mean-field particle-interaction.

\\ ( http://arxiv.org/abs/0804.0367 , 83kb)

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\\

arXiv:0804.0287

Date: Wed, 2 Apr 2008 04:40:04 GMT (8kb)

Title: Concept of momentum-less bodies and a suggestion for its experimental

verification using ultra-cold atoms

Authors: Sanjay M. Wagh

Categories: physics.gen-ph

Comments: 4 pages, No figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

General Principle of Relativity unequivocally supports the notion of

momentum-less energy for bodies (energy-quanta) moving at the {\em same} or

{\em constant} speed relative to all the reference systems. In this

communication, we point out that whether energy-quantum is a momentum-less body

or not is verifiable using ultra-cold atoms trapped in an optical lattice,

perhaps with some minor modifications to the existing such experimental setups.

\\ ( http://arxiv.org/abs/0804.0287 , 8kb)

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\\

arXiv:0804.0494

Date: Thu, 3 Apr 2008 08:18:43 GMT (670kb)

Title: Stability of superfluid and supersolid phases of dipolar bosons in

optical lattices

Authors: Ippei Danshita, Carlos A. R. S\'a de Melo

Categories: cond-mat.other

Comments: 4 pages, 4 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We perform a stability analysis of superfluid and supersolid phases of

polarized dipolar bosons in two-dimensional optical lattices at zero

temperature, and obtain the phase boundaries between superfluid (SF),

checkerboard supersolid (CS), striped supersolid (SS), and collapse (CO). We

show that the phase diagram can be explored through the application of an

external field and the tuning of its direction with respect to the optical

lattice plane. In particular, we find a discontinuous (first-order) transition

between the CS and SS phases, characterized by hysteretic behavior. Finally, we

discuss measurable quantities such as the excitation spectrum and the momentum

distribution as a way of identifying all possible phases.

\\ ( http://arxiv.org/abs/0804.0494 , 670kb)

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\\

arXiv:0804.0532

Date: Thu, 3 Apr 2008 11:51:29 GMT (471kb)

Title: In situ Ramsey Interferometry and Diffraction Echo with an Ultracold

Fermi Gas

Authors: C. Marzok, B. Deh, S. Slama, C. Zimmermann, and Ph.W. Courteille

Categories: cond-mat.other

Comments: 5 pages, 4 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We report on the first observation of Bragg scattering of an ultracold $^6$Li

Fermi gas. We demonstrate a Ramsey-type matter-wave interferometer based on

Bragg diffraction and find robust signatures of persistent matter wave

coherences using an echo pulse sequence. Because of the Pauli principle, the

diffracted fermions oscillate nearly unperturbed in the trapping potential for

long times beyond 2 s. This suggests extremely long coherence times. On these

timescales, only the presence of a $^{87}$Rb cloud seems sufficient to induce

noticeable perturbations.

\\ ( http://arxiv.org/abs/0804.0532 , 471kb)

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\\

arXiv:0804.0544

Date: Thu, 3 Apr 2008 14:24:21 GMT (736kb,D)

Title: Oscillations and interactions of dark and dark-bright solitons in

Bose-Einstein condensates

Authors: C. Becker, S. Stellmer, P. Soltan-Panahi, S. D\"orscher, M. Baumert,

E.-M. Richter, J. Kronj\"ager, K. Bongs and K. Sengstock

Categories: cond-mat.other

Comments: 9 pages, 4 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

Solitons are among the most distinguishing fundamental excitations in a wide

range of non-linear systems such as water in narrow channels, high speed

optical communication, molecular biology and astrophysics. Stabilized by a

balance between spreading and focusing, solitons are wavepackets, which share

some exceptional generic features like form-stability and particle-like

properties. Ultra-cold quantum gases represent very pure and well-controlled

non-linear systems, therefore offering unique possibilities to study soliton

dynamics. Here we report on the first observation of long-lived dark and

dark-bright solitons with lifetimes of up to several seconds as well as their

dynamics in highly stable optically trapped $^{87}$Rb Bose-Einstein

condensates. In particular, our detailed studies of dark and dark-bright

soliton oscillations reveal the particle-like nature of these collective

excitations for the first time. In addition, we discuss the collision between

these two types of solitary excitations in Bose-Einstein condensates.

\\ ( http://arxiv.org/abs/0804.0544 , 736kb)

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\\

arXiv:0804.0471

Date: Thu, 3 Apr 2008 05:19:45 GMT (629kb)

Title: Atomic noise spectra in nonlinear magneto-optical rotation in a rubidium

vapor

Authors: Hebin Li, Vladimir A. Sautenkov, Tigran S. Varzhapetyan, Yuri V.

Rostovtsev, and Marlan O. Scully

Categories: quant-ph

Comments: 5 pages, 5 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We have studied the noise spectra in a nonlinear magneto-optical rotation

experiment in a rubidium vapor. We observed the reduction of noise in the

intensity difference of two orthogonally polarized components of the laser

beam. The dependence of the noise level on both the frequency and the

longitudinal magnetic field has been studied. We found that the optimal

condition for the noise reduction is to work around zero longitudinal magnetic

field, where the intensity correlation between the two orthogonally polarized

components is maximum. Our results can be used to reduce or eliminate the

atomic excess noise, therefore improving the sensitivity of nonlinear

magneto-optical rotation magnetometers and other atom-optical based

applications.

\\ ( http://arxiv.org/abs/0804.0471 , 629kb)

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The replacements:

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\\

arXiv:0709.1669

replaced with revised version Fri, 28 Mar 2008 16:16:50 GMT (492kb)

Title: Mott transition of fermionic atoms in a three-dimensional optical trap

Authors: R. W. Helmes, T. A. Costi and A. Rosch

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

Comments: 4 pages and 5 figures

Journal-ref: PRL 100, 056403 (2008)

\\ ( http://arxiv.org/abs/0709.1669 , 492kb)

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\\

arXiv:0801.1523

replaced with revised version Fri, 28 Mar 2008 14:11:24 GMT (253kb,D)

Title: Determination of the Equation of State of a Two-Component Fermi Gas at

Unitarity

Authors: Yong-il Shin

Categories: cond-mat.stat-mech

Comments: 4 pages, 3 figures / typo correction / figure replacement

\\ ( http://arxiv.org/abs/0801.1523 , 253kb)

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\\

arXiv:0801.3631

replaced with revised version Fri, 28 Mar 2008 17:29:07 GMT (126kb)

Title: Anderson localization of a Bose-Einstein condensate in a 3D random

potential

Authors: S.E. Skipetrov, A. Minguzzi, B.A. van Tiggelen, B. Shapiro

Categories: cond-mat.dis-nn cond-mat.mes-hall

Comments: 4 pages, 2 figures

\\ ( http://arxiv.org/abs/0801.3631 , 126kb)

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\\

arXiv:cond-mat/0701476

replaced with revised version Sat, 29 Mar 2008 08:45:01 GMT (107kb)

Title: Superfluid Insulator Transitions of Hard-Core Bosons on the Checkerboard

Lattice

Authors: Arnab Sen, Kedar Damle and T. Senthil

Categories: cond-mat.str-el

Comments: published version

Journal-ref: Phys. Rev. B 76, 235107 (2007)

\\ ( http://arxiv.org/abs/cond-mat/0701476 , 107kb)

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\\

arXiv:cond-mat/0702029

replaced with revised version Sat, 29 Mar 2008 09:26:31 GMT (34kb)

Title: Unusual liquid state of hard-core bosons on the pyrochlore lattice

Authors: Argha Banerjee, Sergei V. Isakov, Kedar Damle, Yong Baek Kim

Categories: cond-mat.str-el

Comments: published version

Journal-ref: Phys. Rev. Lett. 100, 047208 (2008)

\\ ( http://arxiv.org/abs/cond-mat/0702029 , 34kb)

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\\

arXiv:0705.1888

replaced with revised version Mon, 31 Mar 2008 10:04:37 GMT (114kb)

Title: Quantum Phases of Ultracold Bosonic Atoms in a Two-Dimensional Optical

Superlattice

Authors: Jing-Min Hou

Categories: cond-mat.other

\\ ( http://arxiv.org/abs/0705.1888 , 114kb)

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\

arXiv:0705.3456 (*cross-listing*)

replaced with revised version Mon, 31 Mar 2008 18:39:05 GMT (671kb)

Title: Unifying variational methods for simulating quantum many-body systems

Authors: Christopher M. Dawson, Jens Eisert, Tobias J. Osborne

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

Comments: 5 pages, 3 figures, replaced with published version

Journal-ref: Phys. Rev. Lett. 100, 130501 (2008)

\\ ( http://arxiv.org/abs/0705.3456 , 671kb)

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\\

arXiv:0803.2900

replaced with revised version Mon, 31 Mar 2008 02:56:56 GMT (39kb)

Title: Canonical Trajectories and Critical Coupling of the Bose-Hubbard

Hamiltonian in a Harmonic Trap

Authors: G.G. Batrouni, H. R. Krishnamurthy, K. W. Mahmud, V.G. Rousseau, R.T.

Scalettar

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

Comments: New version of figure 1b

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\ ( http://arxiv.org/abs/0803.2900 , 39kb)

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\\

arXiv:cond-mat/0610198 (*cross-listing*)

replaced with revised version Mon, 31 Mar 2008 10:56:48 GMT (193kb)

Title: Quantum liquid of repulsively bound pairs of particles in a lattice

Authors: David Petrosyan, Bernd Schmidt, James R. Anglin, Michael Fleischhauer

Categories: cond-mat.other quant-ph

Comments: Corrected dimer energy & references

Journal-ref: Phys. Rev. A 76, 033606 (2007)

DOI: 10.1103/PhysRevA.76.033606

\\ ( http://arxiv.org/abs/cond-mat/0610198 , 193kb)

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\\

arXiv:0708.0610

replaced with revised version Tue, 1 Apr 2008 08:31:39 GMT (178kb)

Title: Three fully polarized fermions close to a p-wave Feshbach resonance

Authors: Mattia Jona-Lasinio (LKB - Lhomond, LENS), Ludovic Pricoupenko

(LPTMC), Yvan Castin (LKB - Lhomond)

Categories: cond-mat.other

Comments: 31 pages, 12 figures

Proxy: ccsd hal-00166351

\\ ( http://arxiv.org/abs/0708.0610 , 178kb)

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\\

arXiv:0803.3888

replaced with revised version Tue, 1 Apr 2008 13:25:57 GMT (30kb)

Title: The effects of next to nearest neighbor hopping on Bose-Einstein

condensation in cubic lattices

Authors: G. K. Chaudhary and R. Ramakumar

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

Comments: 4 pages including 6 figures, typos corrected

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\ ( http://arxiv.org/abs/0803.3888 , 30kb)

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\\

arXiv:0710.1984

replaced with revised version Tue, 1 Apr 2008 09:04:37 GMT (229kb)

Title: Density modulations in an elongated Bose-Einstein condensate released

from a disordered potential

Authors: David Cl\'ement (LCFIO), Philippe Bouyer (LCFIO), Alain Aspect

(LCFIO), Laurent Sanchez-Palencia (LCFIO)

Categories: cond-mat.other quant-ph

Comments: Published version; 4+ pages; 4 figures

Proxy: ccsd hal-00178074

Journal-ref: Physical Review A: Atomic, Molecular and Optical Physics 77 (2008)

033631

\\ ( http://arxiv.org/abs/0710.1984 , 229kb)

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\\

arXiv:cond-mat/0405182

replaced with revised version Wed, 2 Apr 2008 19:57:29 GMT (197kb)

Title: Vortex lattice stability and phase coherence in three-dimensional

rapidly rotating Bose condensates

Authors: S. Andrew Gifford, Gordon Baym

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

Comments: 10 pages, 2 figures

Journal-ref: Phys. Rev. A 70, 033602 (2004)

\\ ( http://arxiv.org/abs/cond-mat/0405182 , 197kb)

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\\

arXiv:0705.0058

replaced with revised version Wed, 2 Apr 2008 02:24:21 GMT (213kb)

Title: Exact Floquet states of a driven condensate and their stabilities

Authors: Wenhua Hai, Chaohong Lee, Qianquan Zhu

Categories: quant-ph

Comments: 14 pages, 3 eps figures, final version accepted for publication in J.

Phys. B

\\ ( http://arxiv.org/abs/0705.0058 , 213kb)

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Till next time,

Matt.

-- ========================================================================= Dr M. J. Davis, Senior Lecturer in Physics School of Physical Sciences, email: mdavis_at_physics.uq.edu.au University of Queensland, ph : +61 7 334 69824 Brisbane, QLD 4072, fax : +61 7 336 51242 Australia. http://www.physics.uq.edu.au/people/mdavis/ ========================================================================= 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 Thu Apr 10 2008 - 09:27:39 EST

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