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

Date: Thu, 20 Dec 2007 13:19:09 +1000

Date: Thu, 20 Dec 2007 13:19:09 +1000

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

Hi all,

I'm not quite sure what happened, but for some reason my posting earlier today

was severely truncated. Here is the full list of 39 new preprints and 16

replacements.

Please accept my apologies. Thanks to those who pointed it out to me!

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arXiv:0711.3530

Date: Thu, 22 Nov 2007 10:08:24 GMT (31kb)

Title: Bose-Einstein condensation in a decorated lattice: an application to

supersolid

Authors: D. V. Fil, S. I. Shevchenko

Categories: cond-mat.stat-mech

Comments: 7 pages

\\

The Bose-Einstein condensation of vacancies in a three-dimensional decorated

lattice is considered. The model describes possible scenario of superfluidity

of solid helium, caused by the presence of zero-point vacancies in a

dislocation network. It is shown that the temperature of Bose-Einstein

condensation decreases under increase of the length of the segments of the

network, and the law of decrease depends essentially on the properties of the

vertexes of the network. If the vertexes correspond to barriers with a small

transparency, the critical temperature is inversely as the square of the length

of the segment. On the contrary, if the vertexes correspond to traps for the

vacancies (it is energetically preferable for the vacancies to localize at the

vertexes), an exponential lowering of the temperature of transition takes

place. The highest temperature of Bose-Einstein condensation is reached in the

intermediate case of vertexes with large transparency, but in the absence of

tendency of localization in them. In the latter case the critical temperature

is inversely as the length of the segment.

\\ ( http://arxiv.org/abs/0711.3530 , 31kb)

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arXiv:0711.3627

Date: Thu, 22 Nov 2007 17:41:17 GMT (96kb)

Title: Collective Excitations of Trapped Imbalanced Fermion Gases

Authors: Achilleas Lazarides and Bert Van Schaeybroeck

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

Comments: 4 pages

\\

We present a theoretical study of the collective excitations of a trapped

imbalanced fermion gas at ultralow temperatures, when the system consists of a

superfluid core and a normal outer shell. We formulate the relevant boundary

conditions, taking into account the permeability of the interface to particles.

In the strongly interacting regime, and using a hydrodynamic approach, we

calculate the mode frequencies for spherical and highly elongated ellipsoidal

traps as a function of trap polarization. We find two distinct classes of

modes: In-phase oscillations of the superfluid and normal components, similar

to the collective modes of a single-component system, and oscillations

involving out-of-phase motion of the superfluid core and the normal shell. The

latter have frequencies below the trapping frequency.

\\ ( http://arxiv.org/abs/0711.3627 , 96kb)

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arXiv:0711.3647

Date: Thu, 22 Nov 2007 21:17:35 GMT (36kb)

Title: Dual Fermion Approach to Susceptibility of Correlated Lattice Fermions

Authors: S. Brener, H. Hafermann, A. N. Rubtsov, M. I. Katsnelson and A. I.

Lichtenstein

Categories: cond-mat.str-el

\\

We show how the two-particle Green function (2PGF) can be obtained within the

framework of the Dual Fermion approach. This facilitates the calculation of the

susceptibility in strongly correlated systems where long-ranged non-local

correlations cannot be neglected. We formulate the Bethe-Salpeter equations for

the full vertex in the particle-particle and particle-hole channels and

introduce an approximation for practical calculations. The scheme is applied to

the two-dimensional Hubbard model at half filling. The spin-spin susceptibility

is found to strongly increase for the wavevector $\mathbf{q}=(\pi,\pi)$,

indicating the antiferromagnetic instability.

\\ ( http://arxiv.org/abs/0711.3647 , 36kb)

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arXiv:0711.3676

Date: Fri, 23 Nov 2007 08:09:17 GMT (404kb)

Title: Entanglement growth and simulation efficiency in one-dimensional quantum

lattice systems

Authors: Alvaro Perales and Guifre Vidal

Categories: cond-mat.str-el

Comments: 4 pages, 4 figures

\\

We study the evolution of one-dimensional quantum lattice systems when the

ground state is perturbed by altering one site in the middle of the chain. For

a large class of models, we observe a similar pattern of entanglement growth

during the evolution, characterized by a moderate increase of significant

Schmidt coefficients in all relevant bipartite decompositions of the state. As

a result, the evolution can be accurately described by a matrix product state

and efficiently simulated using the time-evolving block decimation algorithm.

\\ ( http://arxiv.org/abs/0711.3676 , 404kb)

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arXiv:0711.3705

Date: Fri, 23 Nov 2007 10:48:54 GMT (456kb)

Title: Trapped Fermi Gases in Rotating Optical Lattices: Realization and

Detection of the Topological Hofstadter Insulator

Authors: R. O. Umucalilar, Hui Zhai, M. O. Oktel

Categories: cond-mat.mes-hall

Comments: 4 pages, 4 figures

\\

We consider a gas of non-interacting spinless fermions in a rotating optical

lattice and calculate the density profile of the gas in an external confinement

potential. The density profile exhibits distinct plateaus, which correspond to

gaps in the single particle spectrum known as the Hofstadter butterfly. The

plateaus result from insulating behavior whenever the Fermi energy lies within

a gap. We discuss the necessary conditions to realize the Hofstadter insulator

in a cold atom setup and show how the quantized Hall conductance can be

measured from density profiles using the St\v{r}eda formula.

\\ ( http://arxiv.org/abs/0711.3705 , 456kb)

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arXiv:0711.3562

Date: Thu, 22 Nov 2007 13:17:34 GMT (106kb)

Title: EPR argument and Bell inequalities for Bose-Einstein spin condensates

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

Categories: quant-ph

Proxy: ccsd hal-00189827

\\

We discuss the properties of two Bose-Einstein condensates in different spin

states, represented quantum mechanically by a double Fock state. Individual

measurements of the spins of the particles are performed in transverse

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

relative phase of the two macroscopically occupied states. Before the first

spin measurement, the phase is completely undetermined; after a few

measurements, a more and more precise knowledge of its value emerges under the

effect of the quantum measurement process. This naturally leads to the usual

notion of a quasi-classical phase (Anderson phase) and to an interesting

transposition of the EPR (Einstein-Podolsky-Rosen) argument to macroscopic

physical quantities. The purpose of this article is to discuss this

transposition, as well as situations where the notion of a quasi-classical

phase is no longer sufficient to account for the quantum results, and where

significant violations of Bell type inequalities are predicted.

\\ ( http://arxiv.org/abs/0711.3562 , 106kb)

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arXiv:0711.3731

Date: Fri, 23 Nov 2007 14:17:39 GMT (781kb)

Title: Effects of relative phase and interactions on atom-laser outcoupling

from a double-well Bose-Einstein condensate: Markovian and non-Markovian

dynamics

Authors: G. M. Nikolopoulos, C. Lazarou, and P. Lambropoulos

Categories: quant-ph

Comments: to appear in J. Phys. B

\\

We investigate aspects of the dynamics of a continuous atom-laser scheme

based on the merging of independently formed atomic condensates. Our

theoretical analysis covers the Markovian as well as the non-Markovian

operational regimes, and is based on a semiclassical (mean-field) two-mode

model. The role of the relative phase between the two condensates and the

effect of interatomic interactions on the evolution of the trapped populations

and the distribution of outcoupled atoms are discussed.

\\ ( http://arxiv.org/abs/0711.3731 , 781kb)

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arXiv:0711.3796

Date: Fri, 23 Nov 2007 22:35:31 GMT (926kb)

Title: Minimum instances of topological matter in an optical plaquette

Authors: Belen Paredes and Immanuel Bloch

Categories: cond-mat.other

Comments: 8 pages, 11 figures

\\

We propose experimental schemes to create and probe minimum forms of

different topologically ordered states in a plaquette of an optical lattice:

Resonating Valence Bond, Laughlin and string-net condensed states. We show how

to create anyonic excitations on top of these liquids and detect their

fractional statistics. In addition, we propose a way to design a plaquette

ring-exchange interaction, the building block Hamiltonian of a lattice

topological theory. Our preparation and detection schemes combine different

techniques already demonstrated in experiments with atoms in optical

superlattices.

\\ ( http://arxiv.org/abs/0711.3796 , 926kb)

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arXiv:0711.3831

Date: Sat, 24 Nov 2007 10:19:40 GMT (537kb,D)

Title: Cat state production with ultracold bosons in rotating ring

superlattices

Authors: Andreas Nunnenkamp, Ana Maria Rey, Keith Burnett

Categories: cond-mat.other

Comments: 9 pages, 10 figures

\\

Ultracold bosons in rotating ring lattices have previously been shown to form

cat-like superpositions of different quasi-momentum states. We demonstrate that

cat state production in slightly non-uniform ring lattices has several

advantages: the energy gap decreases less severely with the number of

particles, the sensitivity to detunings from the critical rotation frequency is

reduced, and the scheme is not limited to commensurate filling. We show that

different quasi-momentum states can be distinguished in time-of-flight

absorption imaging and propose to probe cat-like correlations via the many-body

oscillations induced by a sudden change in the rotation frequency.

\\ ( http://arxiv.org/abs/0711.3831 , 537kb)

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arXiv:0711.3900

Date: Sun, 25 Nov 2007 13:47:37 GMT (9kb)

Title: On Translational Superfluidity and the Landau Criterion for Trapped Bose

gases in the Gross-Pitaevski Limit

Authors: Walter F. Wreszinski

Categories: cond-mat.supr-con

Comments: 4 pages, no figures

\\

A generalised version of the landau superfluidity condition which is adequate

for general (in particular, inhomogeneous, i.e., non translationally invariant)

systems is formulated. Using the (presumably) asymptotic Bogoliubov density

series for the ground state energy of a dilute Bose gas, we show that this

generalised Landau condition is not satisfied by dilute, trapped Bose gases in

the Gross-Pitaevski limit for any regime of flow velocities. we also suggest an

explanation of this fact, and propose that dilute, trapped Bose gases may

provide a unique laboratory to distinguish between the London and Landau

pictures of superfluidity.

\\ ( http://arxiv.org/abs/0711.3900 , 9kb)

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arXiv:0711.3960

Date: Mon, 26 Nov 2007 07:50:06 GMT (459kb)

Title: The iTEBD algorithm beyond unitary evolution

Authors: Roman Orus, Guifre Vidal

Categories: cond-mat.stat-mech

Comments: 11 pages, 15 figures, 1 appendix with algorithms for specific types

of evolution

\\

The infinite time-evolving block decimation (iTEBD) algorithm [Phys. Rev.

Lett. 98, 070201 (2007)] allows to simulate unitary evolution and to compute

the ground state of one-dimensional quantum lattice systems in the

thermodynamic limit. Here we extend the algorithm to tackle a much broader

class of problems, namely the simulation of arbitrary one-dimensional evolution

operators that can be expressed as a (translationally invariant) tensor

network. Relatedly, we also address the problem of finding the dominant

eigenvalue and eigenvector of a one-dimensional transfer matrix that can be

expressed in the same way. New applications include the simulation, in the

thermodynamic limit, of open (i.e. master equation) dynamics and thermal states

in 1D quantum systems, as well as calculations with partition functions in 2D

classical systems, on which we elaborate. The present extension of the

algorithm also plays a prominent role in the infinite projected entangled-pair

states (iPEPS) approach to infinite 2D quantum lattice systems.

\\ ( http://arxiv.org/abs/0711.3960 , 459kb)

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arXiv:0711.3969

Date: Mon, 26 Nov 2007 10:10:53 GMT (321kb)

Title: Thermodynamic Evidence for Nanoscale Bose-Einstein Condensation in ^4He

Confined in Nanoporous Media

Authors: Keiichi Yamamoto, Yoshiyuki Shibayama, Keiya Shirahama

Categories: cond-mat.mes-hall

Comments: 4 pages, 4 figures, submitted to Phys. Rev. Lett

\\

We report the measurements of the heat capacity of ^4He confined in

nanoporous Gelsil glass that has nanopores of 2.5-nm diameter at pressures up

to 5.3 MPa. The heat capacity has a broad peak at a temperature much higher

than the superfluid transition temperature obtained using the torsional

oscillator technique. The peak provides a definite thermodynamic evidence for

the formation of localized Bose-Einstein condensates (LBECs) on nanometer

length scales. The temperature dependence of heat capacity is well described by

the excitations of phonons and rotons, supporting the existence of LBEC.

\\ ( http://arxiv.org/abs/0711.3969 , 321kb)

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arXiv:0711.4007

Date: Mon, 26 Nov 2007 14:12:03 GMT (613kb)

Title: BEC "level" for measuring small forces

Authors: S. G. Bhongale and Eddy Timmermans

Categories: cond-mat.other

Comments: 4 pages, 4 figures

\\

We propose a device that consists of a trapped two-component phase- separated

Bose-Einstein condensate to measure small forces and map weak potential energy

landscapes. The resolution as well as the measurement precision of this device

can be set dynamically, allowing measurements at multiple scales.

\\ ( http://arxiv.org/abs/0711.4007 , 613kb)

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arXiv:0711.4065

Date: Mon, 26 Nov 2007 18:02:00 GMT (612kb)

Title: FFLO state in 1, 2, and 3 dimensional optical lattices combined with a

non-uniform background potential

Authors: T.K. Koponen, T. Paananen, J.-P. Martikainen, M.R. Bakhtiari, and P.

Torma

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

Comments: 18 pages, 10 figures

\\

We study the phase diagram of an imbalanced two-component Fermi gas in

optical lattices of 1-3 dimensions, considering the possibilities of the FFLO,

Sarma/breached pair, BCS and normal states as well as phase separation, at

finite and zero temperatures. In particular, phase diagrams with respect to

average chemical potential and the chemical potential difference of the two

components are considered, because this gives the essential information about

the shell structures of phases that will occur in presence of an additional

(harmonic) confinement. These phase diagrams in 1, 2 and 3 dimensions show in a

striking way the effect of Van Hove singularities on the FFLO state. Although

we focus on population imbalanced gases, the results are relevant also for the

(effective) mass imbalanced case. We demonstrate by LDA calculations that

various shell structures such as normal-FFLO-BCS-FFLO-normal, or FFLO-normal,

are possible in presence of a background harmonic trap. The phases are

reflected in noise correlations: especially in 1D the unpaired atoms leave a

clear signature of the FFLO state as a zero-correlation area (``breach'')

within the Fermi sea. This strong signature occurs both for a 1D lattice as

well as for a 1D continuum. We also discuss the effect of Hartree energies and

the Gorkov correction on the phase diagrams.

\\ ( http://arxiv.org/abs/0711.4065 , 612kb)

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arXiv:0711.3798

Date: Fri, 23 Nov 2007 23:26:42 GMT (208kb,D)

Title: Unambiguous signatures of entanglement and Bohm's spin EPR paradox

Authors: E. G. Cavalcanti, M. D. Reid, P. D. Drummond, H. A. Bachor

Categories: quant-ph

Comments: 4 pages 3 figures

\\

We obtain criteria to prove either entanglement or Bohm's spin EPR paradox,

from the observed correlations of bosons with non-ideal generators and

detectors. The signatures can be utilized both for microscopic and macroscopic

correlated sources. For twin photons, the required efficiencies are achievable

with current detectors.

\\ ( http://arxiv.org/abs/0711.3798 , 208kb)

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arXiv:0711.3939

Date: Mon, 26 Nov 2007 03:59:46 GMT (539kb)

Title: Towards a Cold-atom Realization of Quantum Maps with Hofstadter's

Butterfly Spectrum

Authors: Jiao Wang and Jiangbin Gong (National Univ. of Singapore)

Categories: quant-ph

Comments: 4 pages, 4 figures, under review since Oct. 4

\\

Quantum systems with Hofstadter's butterfly spectrum are of fundamental

interest to many research areas. Based upon slight modifications of existing

cold-atom experiments, a cold-atom realization of quantum maps with

Hofstadter's butterfly spectrum is proposed. Connections and differences

between our realization and the kicked Harper model are identified. This work

also exposes, for the first time, a simple connection between the kicked Harper

model and the kicked rotor model, the two paradigms of classical and quantum

chaos.

\\ ( http://arxiv.org/abs/0711.3939 , 539kb)

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arXiv:0711.4176

Date: Tue, 27 Nov 2007 04:06:22 GMT (12kb)

Title: A unified approach to the derivation of work theorems for equilibrium

and steady-state, classical and quantum Hamiltonian systems

Authors: M. F. Gelin and D. S. Kosov

Categories: cond-mat.stat-mech

\\

We present a unified and simple method for deriving work theorems for

classical and quantum Hamiltonian systems, both under equilibrium conditions

and in a steady state. Throughout the paper, we adopt the partitioning of the

total Hamiltonian into the system part, the bath part, and their coupling. We

rederive many equalities which are available in the literature and obtain a

number of new equalities for nonequilibrium classical and quantum systems. Our

results can be useful for determining partition functions and (generalized)

free energies through simulations and/or measurements performed on

nonequilibrium systems.

\\ ( http://arxiv.org/abs/0711.4176 , 12kb)

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arXiv:0711.4245

Date: Tue, 27 Nov 2007 13:06:24 GMT (30kb)

Title: Fully frustrated Josephson junction ladders with Mobius boundary

conditions as topologically protected qubits

Authors: Gerardo Cristofano, Vincenzo Marotta, Adele Naddeo, Giuliano Niccoli

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

Comments: 21 pages, 2 figures, in print in Phys. Lett. A

Report-no: Napoli DSF-T-16/2007, INFN-NA-16/2007

\\

We show how to realize a ``protected'' qubit by using a fully frustrated

Josephson Junction ladder (JJL) with Mobius boundary conditions. Such a system

has been recently studied within a twisted conformal field theory (CFT)

approach (Mod. Phys. Lett. A 15 (2000) 1679; Nucl. Phys. B 641 (2002) 547) and

shown to develop the phenomenon of flux fractionalization (Eur. Phys. J. B 49

(2006) 83). The relevance of a ``closed'' geometry has been fully exploited in

relating the topological properties of the ground state of the system to the

presence of half flux quanta and the emergence of a topological order has been

predicted (JSTAT (2005) P03006). In this letter the stability and

transformation properties of the ground states under adiabatic magnetic flux

change are analyzed and the deep consequences on the realization of a solid

state qubit, protected from decoherence, are presented.

\\ ( http://arxiv.org/abs/0711.4245 , 30kb)

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arXiv:0711.4177

Date: Tue, 27 Nov 2007 10:39:02 GMT (155kb)

Title: Generation of polarization entanglement from spatially-correlated

photons in spontaneous parametric down-conversion

Authors: Ryosuke Shimizu, Takashi Yamaguchi, Yasuyoshi Mitsumori, Hideo Kosaka,

Keiichi Edamatsu

Categories: quant-ph

Comments: 4 pages, 4 figures

\\

We propose a novel scheme to generate polarization entanglement from

spatially-correlated photon pairs. We experimentally realized a scheme by means

of a spatial correlation effect in a spontaneous parametric down-conversion and

a modified Michelson interferometer. The scheme we propose in this paper can be

interpreted as a conversion process from spatial correlation to polarization

entanglement.

\\ ( http://arxiv.org/abs/0711.4177 , 155kb)

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arXiv:0711.4186

Date: Tue, 27 Nov 2007 06:06:40 GMT (170kb)

Title: Generating an entangled coherent state of two cavity modes in a

three-level \Lambda - type atomic system

Authors: Qing-Xia Mu, Yong-Hong Ma and L. Zhou

Categories: quant-ph

Comments: 3 figures

\\

In this paper, we present a scheme to generate an entangled coherent state by

considering a three-level \Lambda - type atom interacting with a two-mode

cavity driven by classical fields. The two-mode entangled coherent state can be

obtained under large detuning conditions. Considering the cavity decay, an

analytical solution is deduced.

\\ ( http://arxiv.org/abs/0711.4186 , 170kb)

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arXiv:0711.4259

Date: Tue, 27 Nov 2007 14:05:14 GMT (398kb)

Title: Coherent control of light field with electromagnetically induced

transparency in a dark state Raman coherent tripod system

Authors: YongYao Li, HuaRong Zhang, YongZhu Chen, JianYing Zhou

Categories: quant-ph

\\

The coherent superposition of two-atomic levels induced by coherent

population trapping is employed in a standard $\Lambda$ type scheme to form a

tripod-like system. A weak probe pulse scanning across the system is shown to

experience a crossover from absorption to transparent and then to

amplification. Consequently the group velocity of the probe pulse can be

controlled to propagate either as a subluminal, a standard, a superluminal or

even a negative speed. It is shown that the propagation behavior of the light

field is entirely determined and controlled by the initial states of the

coherent superposition.

\\ ( http://arxiv.org/abs/0711.4259 , 398kb)

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arXiv:0711.4280

Date: Tue, 27 Nov 2007 15:22:20 GMT (553kb)

Title: Quantum Zeno dynamics and quantum Zeno subspaces

Authors: Paolo Facchi, Giuseppe Marmo and Saverio Pascazio

Categories: quant-ph

Comments: 21 pages, 9 figures. Dedicated to George Sudarshan on the occasion of

his 75th birthday. Review of the quantum Zeno dynamics in its three different

formulations. Proposal of a novel experiment in Section 10

\\

A quantum Zeno dynamics can be obtained by means of frequent measurements,

frequent unitary kicks or a strong continuous coupling and yields a partition

of the total Hilbert space into quantum Zeno subspaces, among which any

transition is hindered. We focus on the "continuous" version of the quantum

Zeno effect and look at several interesting examples. We first analyze these

examples in practical terms, towards applications, then propose a novel

experiment.

\\ ( http://arxiv.org/abs/0711.4280 , 553kb)

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arXiv:0711.4321

Date: Tue, 27 Nov 2007 18:28:16 GMT (311kb)

Title: Rabi oscillations and excitation trapping in the coherent excitation of

a mesoscopic frozen Rydberg gas

Authors: Markus Reetz-Lamour, Thomas Amthor, Johannes Deiglmayr, Matthias

Weidem\"uller

Categories: physics.atom-ph

\\

We demonstrate the coherent excitation of a mesoscopic ensemble of about 100

ultracold atoms to Rydberg states by driving Rabi oscillations from the atomic

ground state. We employ a dedicated beam shaping and optical pumping scheme to

compensate for the small transition matrix element. We study the excitation in

a weakly interacting regime and in the regime of strong interactions. When

increasing the interaction strength by pair state resonances we observe an

increased excitation rate through coupling to high angular momentum states.

This effect is in contrast to the proposed and previously observed

interaction-induced suppression of excitation, the so-called dipole blockade.

\\ ( http://arxiv.org/abs/0711.4321 , 311kb)

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arXiv:0711.4172

Date: Tue, 27 Nov 2007 02:44:55 GMT (176kb)

Title: Broadband optical delay with large dynamic range using atomic dispersion

Authors: M. R. Vanner, R. J. McLean, A. I. Sidorov, P. Hannaford and A. M.

Akulshin

Categories: physics.optics

Comments: 8 pages, 5 figures

\\

We report on a tunable all-optical delay line for pulses with optical

frequency within the Rb $D_2$ absorption line. Pulses of 10 ns duration are

delayed in a 10 cm hot vapour cell by up to 40 ns where the transmission

reduces to approximately 10%. Using an optical frequency between absorption

components from different isotopes allows the delay to be increased or

decreased by optical pumping with a second laser, producing rapid tuning over a

range more than 40% of the initial delay. We investigate the frequency and

intensity ranges in which this delay line can be realised. Our observations are

in good agreement with a numerical model of the system.

\\ ( http://arxiv.org/abs/0711.4172 , 176kb)

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arXiv:0711.4390

Date: Tue, 27 Nov 2007 23:59:22 GMT (295kb)

Title: Finite temperature phase diagram of a spin-polarized ultracold Fermi gas

in a highly elongated harmonic trap

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

Categories: cond-mat.stat-mech

Comments: 7 pages and 6 figures;

\\

We investigate the finite temperature properties of an ultracold atomic Fermi

gas with spin population imbalance in a highly elongated harmonic trap.

Previous studies at zero temperature showed that the gas stays in an exotic

spatially inhomogeneous Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superfluid

state at the trap center; while moving to the edge, the system changes into

either a non-polarized Bardeen-Cooper-Schriffer superfluid ($P<P_c$) or a fully

polarized normal gas ($P>P_c$), depending on the smallness of the spin

polarization $P$, relative to a critical value $P_c$. In this work, we show how

these two phase-separation phases evolve with increasing temperature, and

thereby construct a finite temperature phase diagram. For typical interactions,

we find that the exotic FFLO phase survives below one-tenth of Fermi degeneracy

temperature, which seems to be accessible in the current experiment. The

density profile, equation of state, and specific heat of the polarized system

have been calculated and discussed in detail. Our results are useful for the

on-going experiment at Rice University on the search for FFLO states in

quasi-one-dimensional polarized Fermi gases.

\\ ( http://arxiv.org/abs/0711.4390 , 295kb)

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arXiv:0711.4434

Date: Wed, 28 Nov 2007 06:54:46 GMT (639kb)

Title: The stability and free expansion of a dipolar Fermi gas

Authors: L. He, J.-N. Zhang, Yunbo Zhang, S. Yi

Categories: cond-mat.other

Comments: 5 pages, 5 figures

\\

We investigate the stability and the free expansion of a trapped dipolar

Fermi gas. We show that stabilizing the system relying on tuning the trap

geometry is generally inefficient. We further show that the expanded density

profile always gets stretched along the attractive direction of dipolar

interaction. We also point out that by switching off the dipolar interaction

simultaneously with the trapping potential, the deformation of momentum

distribution can be directly observed.

\\ ( http://arxiv.org/abs/0711.4434 , 639kb)

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arXiv:0711.4458

Date: Wed, 28 Nov 2007 10:13:19 GMT (410kb)

Title: Bose-Fermi Pair Correlations in Attractively Interacting Bose-Fermi

Atomic Mixtures

Authors: Takayuki Watanabe, Toru Suzuki and Peter Schuck

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

Comments: 14 pages, 27 figures

\\

We study static properties of attractively interacting Bose-Fermi mixtures of

uniform atomic gases at zero temperature. Using Green's function formalism we

calculate boson-fermion scattering amplitude and fermion self-energy in the

medium to lowest order of the hole line expansion. We study ground state energy

and pressure as functions of the scattering length for a few values of the

boson-fermion mass ratio $m_b/m_f$ and the number ratio $N_b/N_f$. We find that

the attractive contribution to energy is greatly enhanced for small values of

the mass ratio. We study the role of the Bose-Fermi pair correlations in the

mixture by calculating the pole of the boson-fermion scattering amplitude in

the medium. The pole shows a standard quasiparticle dispersion for a Bose-Fermi

pair, for $m_b/m_f\geq 1$. For small values of the mass ratio, on the other

hand, a Bose-Fermi pair with a finite center-of-mass momentum experiences a

strong attraction, implying large medium effects. In addition, we also study

the fermion dispersion relation. We find two dispersion branches with the

possibility of the avoided crossings. This strongly depends on the number rario

$N_b/N_f$.

\\ ( http://arxiv.org/abs/0711.4458 , 410kb)

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arXiv:0711.4520

Date: Wed, 28 Nov 2007 15:35:41 GMT (119kb)

Title: Non-local density correlations as signal of Hawking radiation in BEC

acoustic black holes

Authors: Roberto Balbinot, Alessandro Fabbri and Serena Fagnocchi

Categories: cond-mat.other gr-qc

Comments: 4 pages, 3 eps figures

\\

Using the analogy between gravitational systems and non-homogeneous fluid

flows, it is possible to use Bose Einstein condensates in hydrodynamical regime

as laboratory to test an effect of otherwise extremely difficult detection,

namely Hawking radiation. We propose to observe it via a non-local density

correlations measurement. Estimates of this effect are given.

\\ ( http://arxiv.org/abs/0711.4520 , 119kb)

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arXiv:0711.4445

Date: Wed, 28 Nov 2007 08:20:18 GMT (206kb)

Title: Two-mode Bose-Einstein condensate in a high-frequency "off-diagonal"

driving field

Authors: Qi Zhang, Peter Hanggi, and Jiangbin Gong (National Univ. of

Singapore)

Categories: quant-ph

Comments: 4 pages, 4 figures

\\

A two-mode Bose-Einstein condensate coupled by a high-frequency driving field

is found to display remarkable features. An effective stationary Hamiltonian

approach reveals the emergence of additional degenerate eigenstates as well as

new topological structures of the spectrum. Possible applications, including

the suppression of nonlinear Landau-Zener tunneling, are discussed. An

interesting phenomenon, which we call ``deterministic symmetry-breaking

trapping", is also found in an adiabatic process. Results suggest that a

high-frequency field applied to a Bose-Einstein condensate can induce

unexpected, very rich dynamical phenomena.

\\ ( http://arxiv.org/abs/0711.4445 , 206kb)

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\\

arXiv:0711.4418

Date: Wed, 28 Nov 2007 05:23:47 GMT (161kb)

Title: A pumped atom laser

Authors: N. P. Robins, C. Figl, M. Jeppesen, G. R. Dennis and J. D. Close

Categories: physics.atom-ph

Comments: 15 pages, 4 figures

\\

We present the experimental realization of a pumped atom laser. We

demonstrate the pumping through measurements of the source and laser-mode atom

numbers, making a rate equation study of the pumping process.

\\ ( http://arxiv.org/abs/0711.4418 , 161kb)

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\\

arXiv:0711.4567

Date: Wed, 28 Nov 2007 19:35:28 GMT (94kb)

Title: Guide for atomic and particle physicists to CODATA's recommended values

of the fundamental physical constants

Authors: Savely G. Karshenboim

Categories: physics.atom-ph

Comments: presented at PSAS'2006; to be pubslished in Lect. Not. Phys

\\

The CODATA recommended values of the fundamental constants are widely applied

in particle, nuclear and atomic physics. They are a result of a complicated

evaluation (adjustment) of numerous correlated data of different nature. Their

application is often rather mechanical and as a result is not free of various

confusions which are discussed in this note.

\\ ( http://arxiv.org/abs/0711.4567 , 94kb)

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\\

arXiv:0711.4594

Date: Wed, 28 Nov 2007 21:08:20 GMT (263kb)

Title: P-wave Pairing in Two-Component Fermi Systems with Unequal Population

near Feshbach Resonance

Authors: R. Liao, F. Popescu, K. Quader

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

Comments: 5 pages, 3 figures

\\

We explore p-wave pairing in a single-channel two-component Fermi system with

unequal population near Feshbach resonance. Our analytical and numerical study

reveal a rich superfluid (SF) ground state structure as a function of

imbalance. In addition to the state $\Delta_{\pm 1} \propto Y_{1\pm 1}$, a

multitude of ``mixed'' SF states formed of linear combinations of $Y_{1m}$'s

give global energy minimum under a phase stability condition; these states

exhibit variation in energy with the relative phase between the constituent gap

amplitudes. States with local energy minimum are also obtained. We provide a

geometric representation of the states. A $T$=0 polarization vs. p-wave

coupling phase diagram is constructed across the BEC-BCS regimes. With

increased polarization, the global minimum SF state may undergo a quantum phase

transition to the local minimum SF state.

\\ ( http://arxiv.org/abs/0711.4594 , 263kb)

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\\

arXiv:0711.4635

Date: Thu, 29 Nov 2007 20:32:17 GMT (35kb)

Title: Superfluid and Mott Insulator phases of one-dimensional Bose-Fermi

mixtures

Authors: A. Zujev, A. Baldwin, R. T. Scalettar, V. G. Rousseau, P. J. H.

Denteneer, M. Rigol

Categories: cond-mat.stat-mech

Comments: 7 pages, 11 figures

\\

We study the ground state phases of Bose-Fermi mixtures in one-dimensional

optical lattices with quantum Monte Carlo simulations using the Canonical Worm

algorithm. Depending on the filling of bosons and fermions, and the on-site

intra- and inter-species interaction, different kinds of incompressible and

superfluid phases appear. On the compressible side, correlations between bosons

and fermions can lead to a distinctive behavior of the bosonic superfluid

density and the fermionic stiffness, as well as of the equal-time Green

functions, which allow one to identify regions where the two species exhibit

anticorrelated flow. We present here complete phase diagrams for these systems

at different fillings and as a function of the interaction parameters.

\\ ( http://arxiv.org/abs/0711.4635 , 35kb)

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\\

arXiv:0711.4729

Date: Thu, 29 Nov 2007 14:26:46 GMT (595kb)

Title: Bogoliubov theory of quantum correlations in the time-dependent

Bose-Hubbard model

Authors: Uwe R. Fischer, Ralf Sch\"utzhold, Michael Uhlmann

Categories: cond-mat.other

Comments: 9 pages of RevTex4, 2 figures

\\

By means of an adapted mean-field expansion for large fillings n>>1, we study

the evolution of quantum fluctuations in the time-dependent Bose-Hubbard model,

starting in the superfluid state and approaching the Mott phase by decreasing

the tunneling rate or increasing the interaction strength in time. For two

experimentally relevant cases, we derive analytical results for the freezing

and growth of the number and phase fluctuations, respectively. This allows us

to calculate the temporal growth of the quantum depletion and the decay of

off-diagonal long-range order. We estimate the conditions for the observability

of the time dependence in the correlation functions in the experimental setups

with external trapping present. Finally, we discuss the analogy to quantum

effects in the early universe during the inflationary epoch.

\\ ( http://arxiv.org/abs/0711.4729 , 595kb)

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\\

arXiv:0711.4731

Date: Thu, 29 Nov 2007 14:30:04 GMT (34kb)

Title: Competing Orders in One-Dimensional Half-Integer Fermionic Cold Atoms: A

Conformal Field Theory Approach

Authors: P. Lecheminant, P. Azaria, and E. Boulat

Categories: cond-mat.str-el

Comments: 35 pages, 3 figures

\\

The physical properties of arbitrary half-integer spins F = N - 1/2 fermionic

cold atoms loaded into a one-dimensional optical lattice are investigated by

means of a conformal field theory approach. We show that for attractive

interactions two different superfluid phases emerge for F \ge 3/2: A BCS

pairing phase, and a molecular superfluid phase which is formed from

bound-states made of 2N fermions. In the low-energy approach, the competition

between these instabilities and charge-density waves is described in terms of

Z_N parafermionic degrees of freedom. The quantum phase transition for

F=3/2,5/2 is universal and shown to belong to the Ising and three-state Potts

universality classes respectively. For a filling of one atom per site, a Mott

transition occurs and the nature of the possible Mott-insulating phases are

determined.

\\ ( http://arxiv.org/abs/0711.4731 , 34kb)

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\\

arXiv:0711.4758

Date: Thu, 29 Nov 2007 16:06:47 GMT (13kb)

Title: Generalized Galitskii approach for the vertex function of a Fermi gas

with resonant interaction

Authors: A. Vagov, H. Schomerus, A. Shanenko

Categories: cond-mat.other

Comments: 7 pages, to appear in Physical Review B

\\

We present a generalized Galitskii approach for the Bethe-Salpeter equation

for the two-particle vertex function of a Fermi system with resonant

interaction by accounting for the resonant state in the scattering potential

and utilizing the universal form of the resonant scattering amplitude. The

procedure can be carried out both for the normal as well as for the condensate

state. In both cases, the vertex function in the vicinity of the resonance is

shown to formally coincide with that obtained for a weakly attractive Fermi

gas. Thus we justify the popular calculational framework in which results for

the weakly attractive Fermi gas are formally extrapolated into the domain of

strong coupling, and further to the repulsive side of the resonance, where

molecular states are formed.

\\ ( http://arxiv.org/abs/0711.4758 , 13kb)

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\\

arXiv:0711.4615

Date: Wed, 28 Nov 2007 22:46:17 GMT (43kb)

Title: Equation of State and Phases of Polarized Unitary Fermi Gas

Authors: S. Y. Chang

Categories: physics.atom-ph physics.atm-clus

Comments: 4 pages,4 figures

\\

The equation of state of the partially polarized two component Fermi gas at

zero temperature in the unitary limit is computed by {\it ab initio} auxiliary

field Monte Carlo method. We obtain the critical ratio of the chemical

potentials $\mu_\downarrow/\mu_\uparrow$ at the phase transitions. The value of

$\mu_\downarrow/\mu_\uparrow$ at the transition between the fully paired

superfluid and the partially polarized phase is 0.11 while the critical value

for the phase transition between the partially polarized phase and the fully

polarized normal fluid is -0.59. We also determine the radial boundaries of the

phase transitions of the Fermi gas in the harmonic trap as function of the

total polarization. We find that beyond the critical polarization 0.65, the

fully paired superfluid core disappears in the trapped Fermi gas.

\\ ( http://arxiv.org/abs/0711.4615 , 43kb)

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\\

arXiv:0711.4638

Date: Thu, 29 Nov 2007 01:21:42 GMT (341kb)

Title: Trapping of Neutral Mercury Atoms and Prospects for Optical Lattice

Clocks

Authors: H. Hachisu, K. Miyagishi, S.G. Porsev, A. Derevianko, V. D.

Ovsiannikov, V. G. Pal'chikov, M. Takamoto, H. Katori

Categories: physics.atom-ph

Comments: 4 pages, 3 figures

\\

We report a vapor-cell magneto-optical trapping of Hg isotopes on the

${}^1S_0-{}^3P_1$ intercombination transition. Six abundant isotopes, including

four bosons and two fermions, were trapped. Hg is the heaviest non-radioactive

atom trapped so far, which enables sensitive atomic searches for ``new

physics'' beyond the standard model. We propose an accurate optical lattice

clock based on Hg and evaluate its systematic accuracy to be better than

$10^{-18}$. Highly accurate and stable Hg-based clocks will provide a new

avenue for the research of optical lattice clocks and the time variation of the

fine-structure constant.

\\ ( http://arxiv.org/abs/0711.4638 , 341kb)

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\\

arXiv:0711.4667

Date: Thu, 29 Nov 2007 08:05:48 GMT (368kb)

Title: A magnetic lens for cold atoms controlled by a rf field

Authors: E. Marechal (LPL), B. Laburthe-Tolra (LPL), L. Vernac (LPL), J. -C.

Keller (LPL), O. Gorceix (LPL)

Categories: physics.atom-ph

Proxy: ccsd hal-00192598

\\

We report on a new type of magnetic lens that focuses atomic clouds using a

static inhomogeneous magnetic field in combination with a radio-frequency

field. The experimental study is performed with a cloud of cold cesium atoms.

The rf field adiabatically deforms the magnetic potential of a coil and

therefore changes its focusing properties. The focal length can be tuned

precisely by changing the rf frequency value. Depending on the rf antenna

position relative to the DC magnetic profile, the focal length of the atomic

lens can be either decreased or increased by the rf field.

\\ ( http://arxiv.org/abs/0711.4667 , 368kb)

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The replacements:

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\\

arXiv:0707.1993

replaced with revised version Thu, 22 Nov 2007 07:51:18 GMT (21kb)

Title: Decoherence of a particle in a ring

Authors: Doron Cohen and Baruch Horovitz

Categories: cond-mat.mes-hall

Comments: 5 pages, 1 figure, proofed version to be published in EPL

\\ ( http://arxiv.org/abs/0707.1993 , 21kb)

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\\

arXiv:0709.1311

replaced with revised version Thu, 22 Nov 2007 04:43:32 GMT (5kb)

Title: Higher order terms in the condensate fraction of a homogeneous and

dilute Bose gas

Authors: Sang-Hoon Kim

Categories: cond-mat.stat-mech

Comments: 5 pages, 0 figure

\\ ( http://arxiv.org/abs/0709.1311 , 5kb)

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\\

arXiv:0711.2309

replaced with revised version Fri, 23 Nov 2007 17:32:38 GMT (59kb)

Title: Quantum Phase Transition in a Cold Atomic Spin-Boson Mixture

Authors: Peter P. Orth, Ivan Stanic, Karyn Le Hur

Categories: cond-mat.other

Comments: 4 pages, 2 figures, 1 table

\\ ( http://arxiv.org/abs/0711.2309 , 59kb)

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\\

arXiv:0711.2422

replaced with revised version Thu, 22 Nov 2007 13:09:35 GMT (0kb,I)

Title: Comment on PRL 99,140402 (2007) "Excitations in a nonequilibrium Bose

Einstein Condensate of Exciton-polaritons" by M. Wouters and I. Carusotto

Authors: G. Malpuech, D.D. Solnyshkov, I.A. Shelykh

Categories: cond-mat.mes-hall

Comments: This comment has been withdrawn

\\ ( http://arxiv.org/abs/0711.2422 , 0kb)

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\\

arXiv:quant-ph/0702125

replaced with revised version Thu, 22 Nov 2007 00:05:40 GMT (184kb)

Title: Probing quantum phases of ultracold atoms in optical lattices by

transmission spectra in cavity QED

Authors: Igor. B. Mekhov, Christoph Maschler, Helmut Ritsch

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

Comments: 6 pages, 3 figures

Journal-ref: Nature Phys. 3, 319 (2007)

DOI: 10.1038/nphys571

\\ ( http://arxiv.org/abs/quant-ph/0702125 , 184kb)

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\\

arXiv:0710.3539

replaced with revised version Thu, 22 Nov 2007 17:09:32 GMT (278kb)

Title: Dynamics, dephasing and clustering of impurity atoms in Bose-Einstein

condensates

Authors: Alexander Klein, Martin Bruderer, Stephen R. Clark, and Dieter Jaksch

Categories: quant-ph

Comments: 22 pages, 8 figures, some typos corrected

Journal-ref: New J. Phys. 9, 411 (2007)

DOI: 10.1088/1367-2630/9/11/411

\\ ( http://arxiv.org/abs/0710.3539 , 278kb)

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\\

arXiv:0705.1385

replaced with revised version Sat, 24 Nov 2007 07:50:42 GMT (14kb)

Title: Bell inequalities for continuous-variable correlations

Authors: E. G. Cavalcanti, C. J. Foster, M. D. Reid and P. D. Drummond

Categories: quant-ph

Comments: 4 pages, 1 figure. v2: New results on detector efficiencies and

macroscopic limit, new co-author, changed title and abstract, changed figure,

added journal reference and DOI

Journal-ref: Phys. Rev. Lett. 99, 210405 (2007)

DOI: 10.1103/PhysRevLett.99.210405

\\ ( http://arxiv.org/abs/0705.1385 , 14kb)

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\\

arXiv:0711.2556

replaced with revised version Mon, 26 Nov 2007 07:57:19 GMT (69kb)

Title: Universal geometric entanglement close to quantum phase transitions

Authors: Roman Orus

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

Comments: 4 pages, 3 figures

\\ ( http://arxiv.org/abs/0711.2556 , 69kb)

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\\

arXiv:quant-ph/0609101

replaced with revised version Tue, 27 Nov 2007 20:29:50 GMT (421kb)

Title: Anyonic Braiding in Optical Lattices

Authors: Chuanwei Zhang, V.W. Scarola, Sumanta Tewari and S. Das Sarma

Categories: quant-ph cond-mat.other cond-mat.soft

Comments: 22 pages, 5 figures, published version

Journal-ref: Proc. Natl. Acad. Sci. USA 104, 18415 (2007)

\\ ( http://arxiv.org/abs/quant-ph/0609101 , 421kb)

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\\

arXiv:quant-ph/0703040

replaced with revised version Tue, 27 Nov 2007 09:02:49 GMT (307kb)

Title: Quantum Superposition State Production by Continuous Observations and

Feedback

Authors: Antonio Negretti, Uffe V. Poulsen, Klaus Molmer

Categories: quant-ph

Comments: RevTex4, 4 pages, 2 figures. Published in Phys. Rev. Lett. with

higher quality figures. The first part of the manuscript, regarding the Fock

state generator, has been removed

Journal-ref: Phys. Rev. Lett. 99, 223601 (2007)

\\ ( http://arxiv.org/abs/quant-ph/0703040 , 307kb)

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\\

arXiv:0708.3026

replaced with revised version Tue, 27 Nov 2007 18:15:19 GMT (115kb)

Title: Controlling the Ratchet Effect for Cold Atoms

Authors: Anatole Kenfack, Jiangbin Gong and Arjendu K. Pattanayak

Categories: quant-ph

Comments: 4 pages, 4 figures

\\ ( http://arxiv.org/abs/0708.3026 , 115kb)

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\\

arXiv:physics/0610022

replaced with revised version Tue, 27 Nov 2007 16:33:35 GMT (387kb)

Title: Compression and localization of an atomic cloud in a time dependent

optical lattice

Authors: Will Williams, M. Saffman

Categories: physics.atom-ph

Comments: 11 Figures Revised Manuscript

\\ ( http://arxiv.org/abs/physics/0610022 , 387kb)

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\\

arXiv:0705.4135

replaced with revised version Wed, 28 Nov 2007 01:55:24 GMT (369kb)

Title: Spatial pair correlations of atoms in molecular dissociation

Authors: C.M. Savage and K.V. Kheruntsyan

Categories: cond-mat.other

Comments: Final published version

Journal-ref: Phys. Rev. Lett. 99, 220404 (2007)

DOI: 10.1103/PhysRevLett.99.220404

\\ ( http://arxiv.org/abs/0705.4135 , 369kb)

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\\

arXiv:0709.3381

replaced with revised version Wed, 28 Nov 2007 15:22:32 GMT (40kb,D)

Title: Generalized ABCD propagation for interacting atomic clouds

Authors: F. Impens and Ch. J. Bord\'e

Categories: cond-mat.other

Comments: 10 pages, 2 figures. A new relativistic formulation of the ABCD

formalism in (4+1) dimensions has been added

\\ ( http://arxiv.org/abs/0709.3381 , 40kb)

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\\

arXiv:0710.4860

replaced with revised version Wed, 28 Nov 2007 13:48:36 GMT (430kb)

Title: Loschmidt cooling by time reversal of atomic matter waves

Authors: J. Martin, B. Georgeot, D. L. Shepelyansky (CNRS, Toulouse)

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

Comments: revtex 4 pages, 5 figs, research at

http://www.quantware.ups-tlse.fr/, new data and modifications added

\\ ( http://arxiv.org/abs/0710.4860 , 430kb)

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\\

arXiv:0710.1801

replaced with revised version Thu, 29 Nov 2007 16:46:04 GMT (661kb)

Title: Absence of fermionic quasi-particles in the superfluid state of the

attractive Fermi gas

Authors: Nils Lerch, Lorenz Bartosch, and Peter Kopietz

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

Comments: 4 RevTex pages, 3 figures; title changed, new Figure 1, added

references. We argue that in the entire regime of the BCS-BEC crossover the

quasi-particle picture breaks down in D <=3 for neutral fermions (but NOT for

charged fermions)

\\ ( http://arxiv.org/abs/0710.1801 , 661kb)

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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 Dec 20 2007 - 14:52:45 EST

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