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

Date: Wed, 14 Feb 2007 17:50:19 +1000 (EST)

Date: Wed, 14 Feb 2007 17:50:19 +1000 (EST)

Hi all,

A massive 37 papers make the arXiv selection this week.

But first, a small piece of spam: we are now accepting abstract submissions for

the International Workshop on Quantum Noise, covering cover hot topics in

quantum optics and ultracold quantum gases. Full details at the bottom of the

email - submissions close 23rd February 2007.

On with the new abstracts:

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Paper: cond-mat/0702029

Date: Thu, 1 Feb 2007 21:04:40 GMT (38kb)

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: 4 pages, two column format

Subj-class: Strongly Correlated Electrons

\\

We study the physics of hard-core bosons with unfrustrated hopping ($t$) and

nearest neighbour repulsion ($V$) on the three dimensional pyrochlore lattice.

At half-filling, we demonstrate that the small $V/t$ superfluid state

eventually becomes unstable at large enough $V/t$ to an unusual insulating

state which displays no broken lattice translation symmetry. Equal time and

static density correlators in this insulator are well-described by a mapping to

electric field correlators in the Coulomb phase of a U(1) lattice gauge theory,

allowing us to identify this insulator with a U(1) fractionalized Mott

insulating state. The possibility of observing this phase in suitably designed

atom-trap experiments with ultra-cold atoms is also discussed, as are specific

experimental signatures.

\\ ( http://arXiv.org/abs/cond-mat/0702029 , 38kb)

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Paper: cond-mat/0702031

Date: Thu, 1 Feb 2007 22:40:42 GMT (70kb)

Title: Thermodynamic uncertainty relation

Authors: L. Velazquez

Categories: cond-mat.stat-mech

Comments: 4 pages, 2 eps figures

Subj-class: Statistical Mechanics

\\

Starting from a very general thermodynamic equilibrium situation between a

given interest system and certain generalized thermostat, a suitable extension

of the well-known thermodynamic relation between the heat capacity and the

energy fluctuations has been obtained in the present work. The resulting

identity is able to account for thermodynamical states with a negative heat

capacity C<0, representing at the same time a thermodynamic uncertainty

relation imposing certain restrictions to the determination of the

microcanonical caloric curve. The implications of the present result in the

development of new Monte Carlo methods and its apparent analogies with the

Quantum Mechanics are briefly commented.

\\ ( http://arXiv.org/abs/cond-mat/0702031 , 70kb)

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Paper: cond-mat/0702034

Date: Fri, 2 Feb 2007 16:46:03 GMT (332kb)

Title: Species-specific optical lattices

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

Categories: cond-mat.stat-mech

Comments: 10 pages, 4 figures

Subj-class: Statistical Mechanics

\\

We examine single-frequency optical schemes for species-selective trapping of

ultracold alkali atoms. The ability to independently optically address the

elements of a binary mixture enables the creation of a lattice for one atomic

species with little or no effect on the other. A "tune-in" scheme, using a near

resonant detuning to create a stronger potential for one element than for all

others, is explored. A "tune-out" scheme is also developed, in which the

trapping wavelength is chosen to lie between two strong transitions of an

alkali atom such that the induced dipole moment is zero for that species but is

significant for any other. We compare these schemes by examining the trap

depths and heating rates associated with both. We find that the tune-in scheme

is preferable for Li-Na, Li-K, and K-Na mixtures, while the tune-out scheme is

preferable for Li-Cs, K-Rb, Rb-Cs, K-Cs and 39K-40K mixtures. Several

applications of species-selective optical lattices are explored, including the

creation of a lattice for a single species in the presence of a phonon-like

background, the tuning of relative effective mass, and the isothermal increase

of phase space density.

\\ ( http://arXiv.org/abs/cond-mat/0702034 , 332kb)

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Paper: cond-mat/0702045

Date: Fri, 2 Feb 2007 11:36:12 GMT (157kb)

Title: Limits to the analogue Hawking temperature in a Bose-Einstein condensate

Authors: S. Wuester and C.M. Savage

Categories: cond-mat.other

Comments: 8 pages, 4 figures

Subj-class: Other

\\

Quasi-one dimensional outflow from a dilute gas Bose-Einstein condensate

reservoir is a promising system for the creation of analogue Hawking radiation.

We use numerical modeling to show that stable sonic horizons exist in such a

system under realistic conditions, taking into account the transverse

dimensions and three-body loss. We find that loss limits the achievable

analogue Hawking temperatures, with sodium condensates allowing the highest

temperatures. A condensate of 30,000 atoms, with transverse confinement

frequency omega_perp=6800 2 pi Hz, yields horizon temperatures of about 20 nK

over a period of 50 ms. This is at least four times higher than for other atoms

commonly used for Bose-Einstein condensates.

\\ ( http://arXiv.org/abs/cond-mat/0702045 , 157kb)

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Paper: cond-mat/0702046

Date: Fri, 2 Feb 2007 20:58:51 GMT (9kb)

Title: Stochastic Gross-Pitaevsky Equation for BEC via Coarse-Grained Effective

Action

Authors: Esteban Calzetta, B. L. Hu, Enric Verdaguer

Categories: cond-mat.stat-mech

Comments: 6 pages

Subj-class: Statistical Mechanics

\\

We sketch the major steps in a functional integral derivation of a new set of

Stochastic Gross-Pitaevsky equations (GPE) for a Bose-Einstein condensate (BEC)

confined to a trap at zero temperature with the averaged effects of

non-condensate modes incorporated as stochastic sources. The closed-time-path

(CTP) coarse-grained effective action (CGEA) or the equivalent influence

functional method is particularly suitable because it can account for the full

back-reaction of the noncondensate modes on the condensate dynamics

self-consistently. The Langevin equations derived here containing nonlocal

dissipation together with colored and multiplicative noises are useful for a

stochastic (as distinguished from say, a kinetic) description of the

nonequilibrium dynamics of a BEC. This short paper contains original research

results not yet published anywhere.

\\ ( http://arXiv.org/abs/cond-mat/0702046 , 9kb)

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Paper: cond-mat/0702055

Date: Fri, 2 Feb 2007 19:05:52 GMT (940kb)

Title: Coherence properties of spinor condensates at finite temperatures

Authors: Krzysztof Gawryluk, Miroslaw Brewczyk, Mariusz Gajda, Kazimierz

Rzazewski

Categories: cond-mat.other

Comments: 5 pages, 4 figures

Subj-class: Other

\\

We consider a spinor condensate of 87Rb atoms in its F=1 hyperfine state at

finite temperatures. Putting initially all atoms in m_F=0 component we find

that the system evolves into the state of thermal equilibrium. This state is

approached in a step-like process and when established it manifests itself in

distinguishable ways. The atoms in states m_F=+1 and m_F=-1 start to rotate in

opposite directions breaking the chiral symmetry and showing highly regular

spin textures. Also the coherence properties of the system changes

dramatically. Depending on the strength of spin-changing collisions the system

first enters the stage where the m_F=+1 and m_F=-1 spinor condensate components

periodically loose and recover their mutual coherence whereas their thermal

counterparts get completely dephased. For stronger spin changing collisions the

system enters the regime where also the strong coherence between other

components is built up.

\\ ( http://arXiv.org/abs/cond-mat/0702055 , 940kb)

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Paper: physics/0702013

Date: Thu, 1 Feb 2007 21:52:27 GMT (200kb)

Title: Interfacing Collective Atomic Excitations and Single Photons

Authors: J. Simon, H. Tanji, J.K. Thompson, and V. Vuletic

Categories: physics.atom-ph

Comments: 4 pages, 4 figures, submitted to PRL

Subj-class: Atomic Physics

\\

We study the performance and limitations of a coherent interface between

collective atomic states and single photons. A quantized spin-wave excitation

of an atomic sample inside an optical resonator is prepared probabilistically,

stored, and adiabatically converted on demand into a sub-Poissonian photonic

excitation of the resonator mode. The measured peak single-quantum conversion

efficiency of 0.84(11) and its dependence on various parameters are well

described by a simple model of the mode geometry and multilevel atomic

structure, pointing the way towards implementing high-performance stationary

single-photon sources.

\\ ( http://arXiv.org/abs/physics/0702013 , 200kb)

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Paper: cond-mat/0702057

Date: Mon, 5 Feb 2007 19:32:51 GMT (115kb)

Title: Nematic Order by Disorder in Spin-2 BECs

Authors: Ari Turner, Ryan Barnett, Eugene Demler, and Ashvin Vishwanath

Categories: cond-mat.other

Comments: 5 pages, 4 figures

Subj-class: Other

\\

The effect of quantum and thermal fluctuations on the phase diagram of spin-2

BECs is examined. They are found to play an important role in the nematic part

of the phase diagram, where a mean-field treatment of two-body interactions is

unable to lift the accidental degeneracy between nematic states. Quantum and

thermal fluctuations resolve this degeneracy, selecting the uniaxial nematic

state, for scattering lengths $a_4>a_2$, and the square biaxial nematic state

for $a_4<a_2$. Paradoxically, the fluctuation induced order is stronger at

higher temperatures, for a range of temperatures below $T_c$. For the

experimentally relevant cases of spin-2 $^{87}$Rb and $^{23}$Na, we argue that

such fluctuations could successfully compete against other effects like the

quadratic Zeeman field, and stabilize the uniaxial phase for experimentally

realistic conditions. A continuous transition of the Ising type from uniaxial

to square biaxial order is predicted on raising the magnetic field. These

systems present a promising experimental opportunity to realize the `order by

disorder' phenomenon.

\\ ( http://arXiv.org/abs/cond-mat/0702057 , 115kb)

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Paper: cond-mat/0702058

Date: Mon, 5 Feb 2007 19:55:30 GMT (9kb)

Title: Is the excitation spectrum of an interacting Bose gas really gapless ?

Authors: A.M. Ettouhami (Univ. of Toronto)

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

Comments: 5 pages

Subj-class: Statistical Mechanics; Other

\\

In Bogoliubov's theory of an interacting Bose gas, one does not diagonalize

the part $\hat{H}_2$ of the Hamiltonian that is quadratic in the boson creation

and annihilation operators, but instead one diagonalizes the "grand canonical"

Hamiltonian $\tilde{H}_2 = \hat{H}_2 - \mu \hat{N}_1$, where $\mu$ is the

chemical potential and the operator $\hat{N}_1$ counts the number of bosons

outside the condensate. In this paper, we argue that the ground state energy

and other thermodynamic quantities should be derived by diagonalizing

$\hat{H}_2$ rather than $\tilde{H}_2$, which results in a gapped excitation

spectrum. Gapped excitation spectra were derived previously, by a number of

authors, and were deemed unphysical on the grounds that such spectra violate

Goldstone's theorem. Here, we argue that such an interpretation stems from an

improper identification of the {\em collective} Goldstone modes of the system,

which have to do with the phase of the order parameter, whereas the spectrum of

$\hat{H}_2$ represents single-particle excitations.

\\ ( http://arXiv.org/abs/cond-mat/0702058 , 9kb)

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Paper: cond-mat/0702066

Date: Sun, 4 Feb 2007 03:43:40 GMT (907kb)

Title: Pairing of Strongly Interacting Fermions without Superfluidity

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

Categories: cond-mat.str-el

Subj-class: Strongly Correlated Electrons

\\

We use radio-frequency spectroscopy to study pairing in the normal and

superfluid phases of a strongly interacting Fermi gas with imbalanced spin

populations. At high spin imbalances the system cannot become superfluid even

at zero temperature. In this normal phase full pairing of the minority atoms is

observed. This demonstrates that mismatched Fermi surfaces do not prevent

pairing but quench the superfluid state, thus realizing a system of fermion

pairs that do not condense even at the lowest temperature.

\\ ( http://arXiv.org/abs/cond-mat/0702066 , 907kb)

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Paper: cond-mat/0702067

Date: Sun, 4 Feb 2007 05:34:09 GMT (57kb)

Title: Time-dependent quantum many-body theory of identical bosons in a double

well: Early time ballistic interferences of fragmented and number entangled

states

Authors: David J. Masiello, William P. Reinhardt

Categories: cond-mat.other

Comments: 13 pages, 3 figures

Subj-class: Other

\\

A time-dependent multiconfigurational self-consistent field theory is

presented to describe the many-body dynamics of a gas of identical bosonic

atoms confined to an external trapping potential at zero temperature from first

principles. A set of generalized evolution equations are developed, through the

time-dependent variational principle, which account for the complete and

self-consistent coupling between the expansion coefficients of each

configuration and the underlying one-body wave functions within a restricted

two state Fock space basis that includes the full effects of the condensate's

mean field as well as atomic correlation. The resulting dynamical equations are

a classical Hamiltonian system and, by construction, form a well-defined

initial value problem. They are implemented in an efficient numerical

algorithm. An example is presented, highlighting the generality of the theory,

in which the ballistic expansion of a fragmented condensate ground state is

compared to that of a macroscopic quantum superposition state, taken here to be

a highly entangled number state, upon releasing the external trapping

potential. Strikingly different many-body matter-wave dynamics emerge in each

case, accentuating the role of both atomic correlation and mean-field effects

in the two condensate states.

\\ ( http://arXiv.org/abs/cond-mat/0702067 , 57kb)

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Paper: cond-mat/0702068

Date: Sun, 4 Feb 2007 05:37:04 GMT (195kb)

Title: Measurement of energy eigenstates by a slow detector

Authors: I. Martin and W. H. Zurek

Categories: cond-mat.mes-hall

Comments: 4 pages

Subj-class: Mesoscopic Systems and Quantum Hall Effect

\\

We propose a method for a weak continuous measurement of the energy

eigenstates of a fast quantum system by means of a "slow" detector. Such a

detector is only sensitive to slowly-changing variables, e. g. energy, while

its back-action can be limited solely to decoherence of the eigenstate

superpositions. We apply this scheme to the problem of detection of quantum

jumps between energy eigenstates in a harmonic oscillator.

\\ ( http://arXiv.org/abs/cond-mat/0702068 , 195kb)

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Paper: cond-mat/0702094

Date: Mon, 5 Feb 2007 09:04:34 GMT (113kb)

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

Subj-class: Other; Superconductivity

\\

We investigate an ultracold Bose-Fermi mixture with a Feshbach resonance

between two hyperfine states of fermions. Using a functional integral method,

we calculate collective modes associated with fermion-pairs and bosons in a

superfluid phase. We derive a stability condition of the mixtures, which is

valid in the entire region of the BCS-BEC crossover. This stability condition,

which smoothly connects the well-known results obtained in both the BCS and BEC

limits, shows that sufficiently strong FB interactions destabilize the

mixtures. In order to investigate the consequence of this instability, we study

the ground state energy of both the uniformly mixed and the phase-separated

states. We find that the FB repulsion induces a phase separation, whereas the

FB attraction should cause a collapse of the mixture. The possibilities for the

experimental observation of such instabilities are also discussed.

\\ ( http://arXiv.org/abs/cond-mat/0702094 , 113kb)

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Paper: quant-ph/0702024

Date: Sat, 3 Feb 2007 02:03:52 GMT (7kb)

Title: Theory of decoherence in Bose-Einstein condensate interferometry

Authors: B J Dalton

Categories: quant-ph

Comments: Proceedings DICE 06 Conference, 11-15 Sept 2006, Piombino, Italy

\\

A full treatment of decoherence and dephasing effects in BEC interferometry

has been developed based on using quantum correlation functions for treating

interferometric effects. The BEC is described via a phase space distribution

functional of the Wigner type for the condensate modes and the positive P type

for the non-condensate modes. Ito equations for stochastic condensate and

non-condensate field functions replace the functional Fokker-Planck equation

for the distribution functional and stochastic averages of field function

products determine the quantum correlation functions.

\\ ( http://arXiv.org/abs/quant-ph/0702024 , 7kb)

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Paper: quant-ph/0702031

Date: Mon, 5 Feb 2007 01:37:03 GMT (73kb)

Title: A scheme for demonstration of fractional statistics of anyons in an

exactly solvable model

Authors: Y.-J. Han, R. Raussendorf, and L.-M. Duan

Categories: quant-ph

Comments: 4 pages, 3 figures

\\

We propose a scheme to demonstrate fractional statistics of anyons in an

exactly solvable lattice model proposed by Kitaev that involves four-body

interactions. The required many-body ground state, as well as the anyon

excitations and their braiding operations, can be conveniently realized through

\textit{dynamic}laser manipulation of cold atoms in an optical lattice. Due to

the perfect localization of anyons in this model, we show that a quantum

circuit with only six qubits is enough for demonstration of the basic braiding

statistics of anyons. This opens up the immediate possibility of

proof-of-principle experiments with trapped ions, photons, or nuclear magnetic

resonance systems.

\\ ( http://arXiv.org/abs/quant-ph/0702031 , 73kb)

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Paper: quant-ph/0702034

Date: Mon, 5 Feb 2007 13:20:41 GMT (757kb)

Title: A Single-Photon Server with Just One Atom

Authors: Markus Hijlkema, Bernhard Weber, Holger P. Specht, Simon C. Webster,

Axel Kuhn and Gerhard Rempe

Categories: quant-ph

Comments: 4 pages, 3 figures

\\

Neutral atoms are ideal objects for the deterministic processing of quantum

information. Entanglement operations have been performed by photon exchange or

controlled collisions. Atom-photon interfaces were realized with single atoms

in free space or strongly coupled to an optical cavity. A long standing

challenge with neutral atoms, however, is to overcome the limited observation

time. Without exception, quantum effects appeared only after ensemble

averaging. Here we report on a single-photon source with one-and-only-one atom

quasi permanently coupled to a high-finesse cavity. Quasi permanent refers to

our ability to keep the atom long enough to, first, quantify the

photon-emission statistics and, second, guarantee the subsequent performance as

a single-photon server delivering up to 300,000 photons for up to 30 seconds.

This is achieved by a unique combination of single-photon generation and atom

cooling. Our scheme brings truly deterministic protocols of quantum information

science with light and matter within reach.

\\ ( http://arXiv.org/abs/quant-ph/0702034 , 757kb)

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Paper: quant-ph/0702039

Date: Mon, 5 Feb 2007 16:58:49 GMT (357kb)

Title: Subwavelength addressability and spin-dependent transport in a

double-well optical lattice

Authors: P. J. Lee, M. Anderlini, B. L. Brown, J. Sebby-Strabley, W. D.

Phillips, J. V. Porto

Categories: quant-ph

\\

We report the experimental demonstration of site-selective RF addressing of

atoms with sub-wavelength resolution in a spin-dependent optical lattice of

double wells. We also show spin-dependent transport: coherent spatial

separation of atomic wave packets into adjacent sites according to their

internal state. These tools will be useful for quntum information processing

with neutral atoms in an optical lattice.

\\ ( http://arXiv.org/abs/quant-ph/0702039 , 357kb)

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Paper: quant-ph/0702041

Date: Mon, 5 Feb 2007 18:27:15 GMT (854kb)

Title: Mapping broadband single-photon wavepackets into an atomic memory

Authors: J. Nunn, I. A. Walmsley, M. G. Raymer, K. Surmacz, F. C. Waldermann,

Z. Wang, D. Jaksch

Categories: quant-ph

Comments: 5 pages, 4 figures, published in PRA Rapid Communications

Journal-ref: Phys. Rev. A 75, 011401(R) (2007)

DOI: 10.1103/PhysRevA.75.011401

\\

We analyze a quantum optical memory based on the off-resonant Raman

interaction of a single broadband photon, copropagating with a classical

control pulse, with an atomic ensemble. The conditions under which the memory

can perform optimally are found, by means of a `universal' mode decomposition.

This enables the memory efficiency to be specified in terms of a single

parameter, and the control field pulse shape to be determined via a simple

nonlinear scaling. We apply the same decomposition to determine the optimal

configurations for read-out.

\\ ( http://arXiv.org/abs/quant-ph/0702041 , 854kb)

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Paper: physics/0702025

Date: Sat, 3 Feb 2007 00:30:52 GMT (366kb)

Title: Bright Source of Cold Ions for Surface-Electrode Traps

Authors: Marko Cetina, Andrew Grier, Jonathan Campbell, Isaac Chuang and Vladan

Vuletic

Categories: physics.atom-ph

Comments: Paper submitted to PRL for review on 2/1/06

Subj-class: Atomic Physics

\\

We produce large numbers of low-energy ions by photoionization of

laser-cooled atoms inside a surface-electrode-based Paul trap. The

isotope-selective trap loading rate of $4\times10^{5}$ Yb$^{+}$ ions/s exceeds

that attained by photoionization (electron impact ionization) of an atomic beam

by four (six) orders of magnitude. Traps as shallow as 0.13 eV are easily

loaded with this technique. The ions are confined in the same spatial region as

the laser-cooled atoms, which will allow the experimental investigation of

interactions between cold ions and cold atoms or Bose-Einstein condensates.

\\ ( http://arXiv.org/abs/physics/0702025 , 366kb)

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Paper: cond-mat/0702122

Date: Mon, 5 Feb 2007 23:27:12 GMT (838kb)

Title: Condensed Matter Physics With Light And Atoms: Strongly Correlated Cold

Fermions in Optical Lattices

Authors: Antoine Georges

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

Comments: Lectures given at the Enrico Fermi Summer School on "Ultracold Fermi

Gases", organized by M. Inguscio, W. Ketterle and C. Salomon (Varenna, Italy,

June 2006)

Subj-class: Strongly Correlated Electrons; Statistical Mechanics

\\

Various topics at the interface between condensed matter physics and the

physics of ultra-cold fermionic atoms in optical lattices are discussed. The

lectures start with basic considerations on energy scales, and on the regimes

in which a description by an effective Hubbard model is valid. Qualitative

ideas about the Mott transition are then presented, both for bosons and

fermions, as well as mean-field theories of this phenomenon. Antiferromagnetism

of the fermionic Hubbard model at half-filling is briefly reviewed. The

possibility that interaction effects facilitate adiabatic cooling is discussed,

and the importance of using entropy as a thermometer is emphasized. Geometrical

frustration of the lattice, by suppressing spin long-range order, helps

revealing genuine Mott physics and exploring unconventional quantum magnetism.

The importance of measurement techniques to probe quasiparticle excitations in

cold fermionic systems is emphasized, and a recent proposal based on stimulated

Raman scattering briefly reviewed. The unconventional nature of these

excitations in cuprate superconductors is emphasized.

\\ ( http://arXiv.org/abs/cond-mat/0702122 , 838kb)

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Paper: cond-mat/0702123

Date: Mon, 5 Feb 2007 23:54:09 GMT (76kb)

Title: Thermodynamics of a Bose-Einstein Condensate with Weak Disorder

Authors: G. M. Falco, A. Pelster, R. Graham

Categories: cond-mat.other

Comments: 11 pages, 5 figures

Subj-class: Other

\\

We consider the thermodynamics of a homogeneous superfluid dilute Bose gas in

the presence of weak quenched disorder. Following the zero-temperature approach

of Huang and Meng, we diagonalize the Hamiltonian of a dilute Bose gas in an

external random delta-correlated potential by means of a Bogoliubov

transformation. We extend this approach to finite temperature by combining the

Popov and the many-body T-matrix approximations. This approach permits us to

include the quasi-particle interactions within this temperature range. We

derive the disorder-induced shifts of the Bose-Einstein critical temperature

and of the temperature for the onset of superfluidity by approaching the

transition points from below, i.e., from the superfluid phase. Our results lead

to a phase diagram consistent with that of the finite-temperature theory of

Lopatin and Vinokur which was based on the replica method, and in which the

transition points were approached from above.

\\ ( http://arXiv.org/abs/cond-mat/0702123 , 76kb)

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Paper: cond-mat/0702133

Date: Tue, 6 Feb 2007 09:17:40 GMT (224kb)

Title: Observation of a Glassy Phase in Solid 4He in the Supersolidity Region

Authors: V.N.Grigorev, V.A.Maidanov, V.Yu.Rubanskii, S.P.Rubets,

E.Ya.Rudavskii, A.S.Rybalko, Ye.V.Syrnikov, and V.A.Tikhii

Categories: cond-mat.dis-nn

Comments: 11 pages, 3 figures

Subj-class: Disordered Systems and Neural Networks

\\

High-precision pressure measurements in solid 4He, grown by the capillary

blocking technique, have been made in temperatures range from 50 to 500 mK. The

temperature dependence of pressure indicates that aside from the usual phonon

contribution ~T^4, there is an additional contribution ~ T^2, the latter

becoming dominant at temperatures T < 300 mK, where an abnormal behavior

attributed to supersolidity has been observed. The data suggest the appearance

of a glassy phase (that might be responsible for the anomalous behaviors

observed previously).

\\ ( http://arXiv.org/abs/cond-mat/0702133 , 224kb)

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Paper: cond-mat/0702142

Date: Tue, 6 Feb 2007 14:20:19 GMT (957kb)

Title: Persistent Supercurrent Atom Chip

Authors: T. Mukai, C. Hufnagel, A. Kasper, T. Meno, A. Tsukada, K. Semba, and

F. Shimizu

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

Comments: 4 pages, 5 figures

Subj-class: Superconductivity; Other

\\

Rubidium 87 atoms are trapped in an Ioffe-Pritchard potential generated with

a persistent supercurrent that flows in a loop circuit patterned on a sapphire

surface. The superconducting circuit is a closed loop made of 100 micro meter

wide MBE-grown MgB2 stripe carrying a supercurrent of 2.5 A. To control the

supercurrent in the stripe, an on-chip thermal switch operated by a focused

argon-ion laser is developed. The switch operates as an on/off switch of the

supercurrent, or as a device to set the current to a specific value with the

aid of an external magnetic field. The current can be set even without an

external source if the change is in decreasing direction.

\\ ( http://arXiv.org/abs/cond-mat/0702142 , 957kb)

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Paper: cond-mat/0702154

Date: Tue, 6 Feb 2007 18:12:22 GMT (163kb)

Title: Nearly-one-dimensional self-attractive Bose-Einstein condensates in

optical lattices

Authors: L. Salasnich, A. Cetoli, B. A. Malomed and F. Toigo

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

Comments: 9 pages, 8 figures, 2 tables

Subj-class: Other; Statistical Mechanics

\\

Within the framework of the mean-field description, we investigate atomic

Bose-Einstein condensates (BECs), with attraction between atoms, under the

action of strong transverse confinement and periodic (optical-lattice, OL)

axial potential. Using a combination of the variational approximation (VA),

one-dimensional (1D) nonpolynomial Schr\"{o}dinger equation (NPSE), and direct

numerical solutions of the underlying 3D Gross-Pitaevskii equation (GPE), we

show that the ground state of the condensate is a soliton belonging to the

semi-infinite bandgap of the periodic potential. The soliton may be confined to

a single cell of the lattice, or extend to several cells, depending on the

effective self-attraction strength, $g$ (which is proportional to the number of

atoms bound in the soliton), and depth of the potential, $V_{0}$, the increase

of $V_{0}$ leading to strong compression of the soliton. We demonstrate that

the OL is an effective tool to control the soliton's shape. It is found that,

due to the 3D character of the underlying setting, the ground-state soliton

collapses at a critical value of the strength, $g=g_{c}$, which gradually

decreases with the increase of the depth of the periodic potential, $V_{0}$;

under typical experimental conditions, the corresponding maximum number of

$^{7}$Li atoms in the soliton, $N_{\max}$, ranges between $8,000$ and $4,000$.

Examples of stable multi-peaked solitons are also found in the first finite

bandgap of the lattice spectrum. The respective critical value $g_{c}$ again

slowly decreases with the increase of $V_{0}$, corresponding to $N_{\max

}\simeq 5,000$.

\\ ( http://arXiv.org/abs/cond-mat/0702154 , 163kb)

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Paper: cond-mat/0702156

Date: Tue, 6 Feb 2007 19:02:20 GMT (241kb)

Title: Vortices, antivortices and superfluid shells separating Mott-insulating

regions

Authors: Kaushik Mitra, C. J. Williams, C. A. R. Sa de Melo

Categories: cond-mat.other

Comments: 4 pages, 3 figures

Subj-class: Other

\\

Atomic or molecular bosons in harmonically confined optical lattices exhibit

a wedding cake structure consisting of insulating (Mott) shells. It is shown

that superfluid regions emerge between Mott shells as a result of fluctuations

due to finite hopping. It is found that the order parameter equation in the

superfluid region is not of the Gross-Pitaeviskii type except near the

insulator to superfluid boundaries. The excitation spectra in the Mott and

superfluid regions are obtained, and it is shown that the superfluid shells

posses low energy sound modes with spatially dependent sound velocity described

by a local index of refraction directly related to the local superfluid

density. Lastly, the Berezinskii-Kosterlitz-Thouless transition and

vortex-antivortex pairs are discussed in thin (wide) superfluid shells (rings)

limited by three (two) dimensional Mott regions.

\\ ( http://arXiv.org/abs/cond-mat/0702156 , 241kb)

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

\\

Paper: quant-ph/0702053

Date: Tue, 6 Feb 2007 15:07:08 GMT (344kb)

Title: Resonance fluorescence of a cold atom in a high-finesse resonator

Authors: Marc Bienert, J. Mauricio Torres, Stefano Zippilli, Giovanna Morigi

Categories: quant-ph

Comments: 10 pages, 7 figures

\\

We study the spectra of emission of a system composed by an atom, tightly

confined inside a high-finesse resonator, when the atom is driven by a laser

and is at steady state of the cooling dynamics induced by laser and cavity

field. In general, the spectrum of resonance fluorescence and the spectrum at

the cavity output contain complementary information about the dynamics

undergone by the system. In certain parameter regimes, quantum interference

effects between the scattering processes induced by cavity and laser field lead

to the selective suppression of features of the resonance fluorescence

spectrum, which are otherwise visible in the spectrum of laser-cooled atoms in

free space.

\\ ( http://arXiv.org/abs/quant-ph/0702053 , 344kb)

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

\\

Paper: quant-ph/0702054

Date: Tue, 6 Feb 2007 15:32:58 GMT (123kb)

Title: Strongly-Driven One-Atom Laser

Authors: P. Lougovski, F. Casagrande, A. Lulli, E. Solano

Categories: quant-ph

Comments: 9 pages, 9 figures

\\

We propose the implementation of a strongly-driven one-atom laser, based on

the off-resonant interaction of a three-level atom in $\Lambda$-configuration

with a single cavity mode and three laser fields. We show that the system can

be described equivalently by a two-level atom coupled to the cavity and driven

by a strong effective coherent field, yielding Schr\"odinger cat states. The

effective dynamics can be solved exactly, including a thermal field bath,

allowing an analytical description of field statistics and entanglement

properties, as well as of the environment-induced decoherence of atom-field

pure states. Finally, we propose a way to monitor the decoherence of these

states by measuring atomic populations and confirm the validity of our model

through full numerical solutions.

\\ ( http://arXiv.org/abs/quant-ph/0702054 , 123kb)

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

\\

Paper: cond-mat/0702159

Date: Tue, 6 Feb 2007 22:52:55 GMT (239kb)

Title: Superfluidity of Grain Boundaries in Solid Helium-4

Authors: L. Pollet, M. Boninsegni, A. B. Kuklov, N. V. Prokof'ev, B. V.

Svistunov, M. Troyer

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

Subj-class: Statistical Mechanics; Other

\\

By large-scale quantum Monte Carlo simulations we show that grain boundaries

in Helium-4 crystals are generically superfluid at low temperature, with a

transition temperature of the order of ~0.5K at the melting pressure;

insulating grain boundaries are found only for special orientations of the

grains. We also find that close vicinity to the melting line is not a necessary

condition for superfluid grain boundaries, and a grain boundary in direct

contact with the superfluid liquid at the melting curve is found to be

mechanically stable and the grain boundary superfluidity observed by Sasaki et

al. [Science 313, 1098 (2006)] is not just a crack filled with superfluid.

\\ ( http://arXiv.org/abs/cond-mat/0702159 , 239kb)

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

\\

Paper: cond-mat/0702175

Date: Wed, 7 Feb 2007 14:29:07 GMT (303kb)

Title: Bright solitons and soliton trains in a fermion-fermion mixture

Authors: Sadhan K. Adhikari

Categories: cond-mat.other

Comments: 5 pages, 7 figures

Subj-class: Other

Journal-ref: EUROPEAN PHYSICAL JOURNAL D 40 (2006) 157-160

\\

We use a time-dependent dynamical mean-field-hydrodynamic model to predict

and study bright solitons in a degenerate fermion-fermion mixture in a

quasi-one-dimensional cigar-shaped geometry using variational and numerical

methods. Due to a strong Pauli-blocking repulsion among identical

spin-polarized fermions at short distances there cannot be bright solitons for

repulsive interspecies fermion-fermion interactions. However, stable bright

solitons can be formed for a sufficiently attractive interspecies interaction.

We perform a numerical stability analysis of these solitons and also

demonstrate the formation of soliton trains. These fermionic solitons can be

formed and studied in laboratory with present technology.

\\ ( http://arXiv.org/abs/cond-mat/0702175 , 303kb)

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

\\

Paper: cond-mat/0702178

Date: Wed, 7 Feb 2007 15:36:02 GMT (249kb)

Title: Excited Thomas-Efimov levels in ultracold gases

Authors: Mark D. Lee, Thorsten Koehler, Paul S. Julienne

Categories: cond-mat.other

Comments: 16 pages, 10 eps figures

Subj-class: Other

\\

Since the early days of quantum physics, the complex behavior of three

interacting particles has been the subject of numerous experimental and

theoretical studies. In a recent Letter to Nature, Kraemer et al. [Nature

(London) 440, 315 (2006)] report on experimental ``evidence for Efimov quantum

states'' in an ultracold gas of cesium atoms. Such quantum states refer to an

infinite series of energy levels of three identical Bose particles,

accumulating at the threshold for dissociation as the scattering length of each

pair is tuned to infinity. Whereas the existence of a single Efimov state has

been predicted for three helium atoms, earlier experimental studies concluded

that this elusive state had not been found. In this paper we show by an

intuitive argument and full numerical calculations that the helium and cesium

experiments actually provide evidence of the same, ground state of this trimer

spectrum, which the helium experimentalists and pioneering theoretical studies

had not associated with Efimov's effect. Unlike the helium trimer, the observed

133Cs_3 resonance refers to a Borromean molecular state. We discuss how as yet

unobserved, excited Efimov quantum states might be detected in ultracold gases

of 85Rb and of 133Cs at magnetic field strengths in the vicinity of 0.08 T (800

G).

\\ ( http://arXiv.org/abs/cond-mat/0702178 , 249kb)

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

\\

Paper: cond-mat/0702183

Date: Wed, 7 Feb 2007 17:17:04 GMT (516kb)

Title: Coherent Matter Wave Transport in Speckle Potentials

Authors: R.C. Kuhn, O. Sigwarth, C. Miniatura, D. Delande, C.A. Mueller

Categories: cond-mat.other

Comments: 33 pages

Subj-class: Other

\\

This article studies multiple scattering of matter waves by a disordered

optical potential in two and in three dimensions. We calculate fundamental

transport quantities such as the scattering mean free path $\ell_s$, the

Boltzmann transport mean free path $\elltrb$, and the Boltzmann diffusion

constant $D_B$, using a diagrammatic Green functions approach. Coherent

multiple scattering induces interference corrections known as weak localization

which entail a reduced diffusion constant. We derive the corresponding

expressions for matter wave transport in an correlated speckle potential and

provide the relevant parameter values for a possible experimental study of this

coherent transport regime, including the critical crossover to the regime of

strong or Anderson localization.

\\ ( http://arXiv.org/abs/cond-mat/0702183 , 516kb)

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

\\

Paper: quant-ph/0702067

Date: Wed, 7 Feb 2007 13:56:19 GMT (89kb)

Title: Spatial Entanglement From Off-Diagonal Long Range Order in a BEC

Authors: Libby Heaney, Janet Anders, Dagomir Kaszlikowski, Vlatko Vedral

Comments: 4 pages, 2 figures

\\

We quantify the spatial entanglement in an ideal bosonic gas around the

transition temperature for condensation by probing the gas with two localised

quantum harmonic oscillators. We show that spatial entanglement in the gas is

directly related to the off diagonal long range order (ODLRO) of the system and

hence to the onset of condensation.

\\ ( http://arXiv.org/abs/quant-ph/0702067 , 89kb)

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

\\

Paper: cond-mat/0702191

Date: Thu, 8 Feb 2007 01:03:46 GMT (50kb)

Title: Phase Transitions and Pairing Signature in Strongly Attractive Fermi

Atomic Gases

Authors: X W Guan, M T Batchelor, C Lee and M Bortz

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

Comments: 4 pages, 3 figures

Subj-class: Strongly Correlated Electrons; Statistical Mechanics

\\

We investigate quantum phase transitions and pairing signature in the

one-dimensional two-component Fermi atomic gas with an external field. The

phase diagram, critical fields, magnetization and local pairing correlation are

obtained analytically via the exact thermodynamic Bethe ansatz. At zero

temperature, bound pairs of fermions with opposite spin states form a singlet

ground state when the external field $H < H_{c1}$. A completely ferromagnetic

phase without pairing occurs when the external field $H > H_{c2}$. In the

region $H_{c1} < H < H_{c2}$ we observe a mixed phase of matter in which paired

and unpaired atoms coexist. The phase diagram is reminiscent of that of type II

superconductors. For temperatures below the degenerate temperature and in the

absence of external field, the bound pairs of fermions form hard-core bosons

obeying generalized exclusion statistics.

\\ ( http://arXiv.org/abs/cond-mat/0702191 , 50kb)

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

\\

Paper: cond-mat/0702195

Date: Thu, 8 Feb 2007 07:44:07 GMT (379kb)

Title: Mean field thermodynamics of a spin-polarized spherically trapped Fermi

gas at unitarity

Authors: Xia-Ji Liu, Hui Hu, and Peter D. Drummond

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

Comments: 13 pages + 9 figures; to appear in Phys. Rev. A

Subj-class: Strongly Correlated Electrons; Statistical Mechanics

\\

We calculate the mean-field thermodynamics of a spherically trapped Fermi gas

with unequal spin populations in the unitarity limit, comparing results from

the Bogoliubov-de Gennes equations and the local density approximation. We

follow the usual mean-field decoupling in deriving the Bogoliubov-de Gennes

equations and set up an efficient and accurate method for solving these

equations. In the local density approximation we consider locally homogeneous

solutions, with a slowly varying order parameter. With a large particle number

these two approximation schemes give rise to essentially the same results for

various thermodynamic quantities, including the density profiles. This

excellent agreement strongly indicates that the small oscillation of order

parameters near the edge of trap, sometimes interpreted as spatially

inhomogeneous Fulde-Ferrell-Larkin-Ovchinnikov states in previous studies of

Bogoliubov-de Gennes equations, is a finite size effect. We find that a bimodal

structure emerges in the density profile of the minority spin state at finite

temperature, as observed in experiments. The superfluid transition temperature

as a function of the population imbalance is determined, and is shown to be

consistent with recent experimental measurements. The temperature dependence of

the equation of state is discussed.

\\ ( http://arXiv.org/abs/cond-mat/0702195 , 379kb)

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

\\

Paper: cond-mat/0702215

Date: Thu, 8 Feb 2007 14:55:22 GMT (13kb)

Title: Bose-Einstein condensation and Casimir effect for ideal Bose Gas

confined between two slabs

Authors: Shyamal Biswas

Categories: cond-mat.stat-mech

Comments: 4 pages,1 figure

Subj-class: Statistical Mechanics

\\

We study the Casimir effect for a 3-d system of ideal Bose gas in a slab

geometry with Dirichlet boundary condition. We calculate the temperature($T$)

dependence of the Casimir force below and above the Bose-Einstein condensation

temperature($T_c$). At $T\le T_c$ the Casimir force vanishes as

$[\frac{T}{T_c}]^{3/2}$. For $T\gtrsim T_c$ it weakly depends on temperature.

For $T\gg T_c$ it vanishes as $[\frac{T_c}{T}]^{3/2}$. At finite temperatures

this force for thermalized photons in between two plates has a classical

expression which is independent of $\hbar$. At finite temperatures the Casimir

force for our system depends on $\hbar$.

\\ ( http://arXiv.org/abs/cond-mat/0702215 , 13kb)

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

\\

Paper: cond-mat/0702216

Date: Thu, 8 Feb 2007 16:09:58 GMT (127kb)

Title: Spatially resolved photo ionization of ultracold atoms on an atom chip

Authors: S. Kraft, A. G\"{u}nther, J. Fort\'{a}gh, and C. Zimmermann

Categories: cond-mat.other

Subj-class: Other

\\

We report on photo ionization of ultracold magnetically trapped Rb atoms on

an atom chip. The atoms are trapped at 5 $\mu $K in a strongly anisotropic

trap. Through a hole in the chip with a diameter of 150 $\mu $m two laser beams

are focussed onto a fraction of the atomic cloud. A first laser beam with a

wavelength of 778 nm excites the atoms via a two photon transition to the 5D

level. With a fiber laser at 1080 nm the excited atoms are photo ionized.

Ionization leads to depletion of the atomic density distribution observed by

absorption imaging. The resonant ionization spectrum is reported. The setup

used in this experiment is not only suitable to investigate BEC ion mixtures

but also single atom detection on an atom chip.

\\ ( http://arXiv.org/abs/cond-mat/0702216 , 127kb)

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

\\

Paper: cond-mat/0702223

Date: Thu, 8 Feb 2007 20:45:41 GMT (107kb)

Title: Coherent state path integral and super-symmetry for condensates composed

of bosonic and fermionic atoms

Authors: Bernhard Mieck

Categories: cond-mat.stat-mech

Comments: 117 pages; a second part, particularly applicable for d=2 spatial

dimensions, is in preparation

Subj-class: Statistical Mechanics

\\

A super-symmetric coherent state path integral on the Keldysh time contour is

considered for bosonic and fermionic atoms which interact among each other with

a common short-ranged two-body potential. We investigate the symmetries of

Bose-Einstein condensation for the equivalent bosonic and fermionic

constituents and specialize on the examination of super-symmetries for pair

condensate terms. A Hubbard-Stratonovich transformation from 'Nambu'-doubled

super-fields leads to a generating function with super-matrices for the

self-energy whose manifold is given by the ortho-symplectic super-group

Osp(S,S|2L). Effective equations are derived for anomalous terms which are

related to the molecular- and BCS- condensate pairs. A change of integration

measure for the coset decomposition Osp(S,S|2L)/U(L|S)xU(L|S) is performed,

including a separation of density and anomalous parts of the self-energy with a

gradient expansion for the Goldstone modes. The independent anomalous fields in

the actions can be transformed by the inverse square root of the metric tensor

of Osp(S,S|2L)/U(L|S) so that the coset integration measure with the

super-Jacobi-determinant can be removed from the coherent state path integral

and Gaussian-like integrations remain. The variations of the independent coset

fields in the effective actions result in classical field equations for a

nonlinear sigma model with the anomalous terms.

\\ ( http://arXiv.org/abs/cond-mat/0702223 , 107kb)

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

And if you still want to keep reading, the replacements:

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

\\

Paper: physics/0611237

replaced with revised version Mon, 29 Jan 2007 15:24:51 GMT (177kb)

Title: Interaction-induced crossover versus finite-size condensation in a

weakly interacting trapped 1D Bose gas

Authors: Isabelle Bouchoule (LCFIO), Karen V. Kheruntsyan (ARC Centre of

Excellence for Quantum-Atom Optics), Gora Shlyapnikov (LPTMS)

Categories: physics.atom-ph cond-mat.other cond-mat.stat-mech

Comments: 4 pages

Proxy: ccsd hal-00116204

Subj-class: Atomic Physics; Other; Statistical Mechanics

\\ ( http://arXiv.org/abs/physics/0611237 , 177kb)

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

\\

Paper: cond-mat/0604476

replaced with revised version Fri, 2 Feb 2007 19:03:47 GMT (147kb)

Title: Relaxation in a Completely Integrable Many-Body Quantum System: An Ab

Initio Study of the Dynamics of the Highly Excited States of Lattice

Hard-Core Bosons

Authors: Marcos Rigol (1), Vanja Dunjko (2), Vladimir Yurovsky (3), Maxim

Olshanii (2) ((1) UC Davis, (2) USC, (3) U Tel Aviv)

Categories: cond-mat.other

Comments: 4 pages, 2 figures, published version

Subj-class: Other

Journal-ref: Phys. Rev. Lett. 98, 050405 (2007)

DOI: 10.1103/PhysRevLett.98.050405

\\ ( http://arXiv.org/abs/cond-mat/0604476 , 147kb)

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

\\

Paper: cond-mat/0605278

replaced with revised version Fri, 2 Feb 2007 15:24:07 GMT (363kb)

Title: Entanglement and Quantum Noise Due to a Thermal Bosonic Field

Authors: Dmitry Solenov, Denis Tolkunov, Vladimir Privman

Categories: cond-mat.mes-hall

Comments: 12 pages, 9 figures; typos corrected

Report-no: VP-197

Subj-class: Mesoscopic Systems and Quantum Hall Effect

Journal-ref: Phys. Rev. B 75, 035134 (2007)

DOI: 10.1103/PhysRevB.75.035134

\\ ( http://arXiv.org/abs/cond-mat/0605278 , 363kb)

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

\\

Paper: cond-mat/0611421

replaced with revised version Sat, 3 Feb 2007 00:19:12 GMT (41kb)

Title: Pairing in Asymmetrical Fermi Systems with Intra- and Inter-Species

Correlations

Authors: Renyuan Liao and Khandker F. Quader (Dept of Physics, Kent State

University)

Categories: cond-mat.supr-con cond-mat.str-el nucl-th physics.atom-ph

Comments: Contents revised. Added references

Subj-class: Superconductivity; Strongly Correlated Electrons; Atomic Physics

\\ ( http://arXiv.org/abs/cond-mat/0611421 , 41kb)

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

\\

Paper: cond-mat/0701739

replaced with revised version Mon, 5 Feb 2007 09:48:01 GMT (34kb)

Title: Accurate determination of the superfluid-insulator transition in the

one-dimensional Bose-Hubbard model

Authors: Jakub Zakrzewski and Dominique Delande

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

Comments: revised version, modified fig.1, a reference added, 5pp. 3figs

Subj-class: Statistical Mechanics; Other

\\ ( http://arXiv.org/abs/cond-mat/0701739 , 34kb)

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

\\

Paper (*cross-listing*): math-ph/0610034

replaced with revised version Sun, 4 Feb 2007 21:37:41 GMT (14kb)

Title: Bose-Einstein Condensation and Spontaneous Symmetry Breaking

Authors: Elliott H. Lieb, Robert Seiringer, Jakob Yngvason

Categories: math-ph cond-mat.stat-mech math.MP

Comments: Contribution to the proceedings of the 21st Max Born Symposium,

Wroclaw, Poland, June 26--28, 2006. (References added. To be published in

Reports on Mathematical Physics.)

Subj-class: Mathematical Physics; Statistical Mechanics

\\ ( http://arXiv.org/abs/math-ph/0610034 , 14kb)

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

\\

Paper: quant-ph/0601012

replaced with revised version Sat, 3 Feb 2007 03:44:53 GMT (641kb)

Title: Two-Mode Theory of BEC Interferometry

Authors: B J Dalton

Categories: quant-ph

Comments: Four figures (7 files)

\\ ( http://arXiv.org/abs/quant-ph/0601012 , 641kb)

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

\\

Paper: quant-ph/0603216

replaced with revised version Sun, 4 Feb 2007 17:49:16 GMT (545kb)

Title: Improving Raman velocimetry of laser-cooled cesium atoms by

spin-polarization

Authors: Julien Chab\'{e} (PhLAM, CERLA), Hans Lignier (PhLAM, CERLA), Pascal

Szriftgiser (PhLAM, CERLA), Jean Claude Garreau (PhLAM, CERLA)

Categories: quant-ph cond-mat.other physics.atom-ph physics.optics

Comments: 12 pages, 6 figures, Elsevier style, to appear in Opt. Commun

Proxy: ccsd ccsd-00021689

Subj-class: Quantum Physics; Optics; Atomic Physics; Other

\\ ( http://arXiv.org/abs/quant-ph/0603216 , 545kb)

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

\\

Paper: quant-ph/0701132

replaced with revised version Sat, 3 Feb 2007 14:11:35 GMT (714kb)

Title: Topological stability of stored optical vortices

Authors: R. Pugatch, M. Shuker, O. Firstenberg, A. Ron, N. Davidson

Categories: quant-ph

Comments: 4 pages, 4 figures v2: minor grammatical corrections v3: problem with

references fixed v4: minor clarifications added to the text

\\ ( http://arXiv.org/abs/quant-ph/0701132 , 714kb)

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

\\

Paper: cond-mat/0611740

replaced with revised version Tue, 6 Feb 2007 02:33:02 GMT (380kb)

Title: Josephson probe of Fulde-Ferrell-Larkin-Ovchinnikov phases in atomic

Fermi gases

Authors: Hui Hu & Xia-Ji Liu

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

Comments: 5 pages, 3 figures; references added

Subj-class: Superconductivity; Strongly Correlated Electrons

\\ ( http://arXiv.org/abs/cond-mat/0611740 , 380kb)

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

\\

Paper (*cross-listing*): math-ph/0606058

replaced with revised version Tue, 6 Feb 2007 08:25:28 GMT (28kb)

Title: Rapidly Rotating Bose-Einstein Condensates in Strongly Anharmonic Traps

Authors: M. Correggi, T. Rindler-Daller, J. Yngvason

Categories: math-ph cond-mat.stat-mech math.MP

Comments: LaTex2e, 28 pages, revised version to be published in Journal of

Mathematical Physics

Subj-class: Mathematical Physics; Statistical Mechanics

MSC-class: 35Q55, 47J30, 76M23

\\ ( http://arXiv.org/abs/math-ph/0606058 , 28kb)

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

\\

Paper: cond-mat/0510407

replaced with revised version Wed, 7 Feb 2007 15:08:54 GMT (130kb)

Title: Functional Integral for Ultracold Fermionic Atoms

Authors: S. Diehl, C. Wetterich

Categories: cond-mat.supr-con

Comments: 39 pages, 11 figures

Subj-class: Superconductivity

\\ ( http://arXiv.org/abs/cond-mat/0510407 , 130kb)

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

\\

Paper (*cross-listing*): nucl-th/0612086

replaced with revised version Wed, 7 Feb 2007 18:00:41 GMT (142kb)

Title: Effective Field Theory for Dilute Fermions with Pairing

Authors: R.J. Furnstahl, H.-W. Hammer, S.J. Puglia

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

Comments: 31 pages, 10 figures, affiliation updated, paper unchanged

Report-no: HISKP-TH-06-40

Subj-class: Nuclear Theory; Superconductivity

\\ ( http://arXiv.org/abs/nucl-th/0612086 , 142kb)

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

\\

Paper: cond-mat/0602108

replaced with revised version Thu, 8 Feb 2007 11:06:01 GMT (322kb)

Title: Supersonic optical tunnels for Bose-Einstein condensates

Authors: S. Wuester and B. J. Dabrowska-Wuester

Categories: cond-mat.other

Comments: 13 pages, 3 figures, major revision

Subj-class: Other

\\ ( http://arXiv.org/abs/cond-mat/0602108 , 322kb)

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

And finally the workshop:

*> **********************************************
*

*> International Workshop on Quantum Noise
*

*> **********************************************
*

*>
*

*> incorporating a Symposium to celebrate Crispin Gardiner's
*

*> contributions to Quantum Optics and Atom Optics
*

*>
*

*> 14 - 18 MAY 2007
*

*> BreakFree Grand Pacific resort,
*

*> Caloundra, Queensland
*

*> Australia
*

*>
*

*> http://www.acqao.org/qn
*

*>
*

*> CALL FOR PAPERS
*

*> Abstract submission page is now open. Please use the online form to submit a title
*

*> and short (50-100 word) abstract by 23rd February. Notification of acceptance will
*

*> be issued by 2nd March.
*

*>
*

*> FOCUS
*

*> The workshop will cover hot topics in quantum optics and ultracold quantum gases,
*

*> from both theory and experiment. A particular focus will be on quantum aspects of
*

*> matter waves and macroscopic quantum states, going beyond the methods and
*

*> predictions of mean-field theory. This will include advances in analytical and
*

*> computational methods, the latest experimental results probing the quantum nature
*

*> of BECs, and applications of BEC to quantum information.
*

*>
*

*> TOPICS
*

*> ? Quantum optics and atom optics
*

*> ? Recent advances in BEC physics
*

*> ? Degenerate Fermi gases and Bose-Fermi mixtures
*

*> ? Stochastic methods and novel computational techniques
*

*> ? Bosons and fermions in lattices
*

*> ? Atom-molecular BEC
*

*> ? Atom-light entanglement
*

*> ? Macroscopic tests of quantum mechanics
*

*>
*

*> INVITED SPEAKERS
*

*> Brian Anderson - University of Arizona, USA
*

*> Rob Ballagh - University of Otago, New Zealand
*

*> Howard Carmichael - University of Auckland, New Zealand
*

*> Subhash Chaturvedi - University of Hyderabad, India
*

*> Matthew Collett - University of Auckland, New Zealand
*

*> Crispin Gardiner - University of Otago, New Zealand
*

*> Ed Hinds - Imperial College, UK
*

*> Gerd Leuchs - University Erlangen-Nuremberg, Germany
*

*> Scott Parkins - University of Auckland, New Zealand
*

*> Silvania Pereira - Delft University of Technology, The Netherlands
*

*> Matthias Troyer - ETH Zurich, Switzerland
*

*> Chris Westbrook - Institut d'Optique, Orsay, France
*

*> Peter Zoller - Universität Innsbruck, Austria
*

*>
*

*> DATES:
*

*> ? Abstract submission: 23 February 2007
*

*> ? Early registration: 16 March 2007
*

*>
*

*> FEES:
*

*> Full Workshop
*

*> ? Delegate: AU $400
*

*> ? Full time student: AU $200
*

*>
*

*> One-day registration for Symposium only
*

*> ? Delegate: AU $150
*

*> ? Full time student: AU $75
*

*>
*

*> MAILING LIST
*

*> To express your interest in this workshop and add your name to our mailing list for
*

*> updates, please send an e-mail to Joel Corney (corney_at_physics.uq.edu.au) with the
*

*> words "Subscribe QN.07" as the SUBJECT.
*

*>
*

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 Wed Feb 14 2007 - 17:50:19 EST

*
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