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

Date: Wed, 07 Jan 2009 22:23:40 +1000

Date: Wed, 07 Jan 2009 22:23:40 +1000

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

A busy week with 39 preprints and 13 replacements. Look out for the paper that

explains the mathematics of the financial crisis: apparently there are too many

indistinguishable US notes floating around and they have Bose condensed!

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arXiv:0811.4456

Date: Thu, 27 Nov 2008 00:32:38 GMT (843kb)

Title: Extreme tunability of interactions in a $^7$Li Bose-Einstein condensate

Authors: Scott E. Pollack, D. Dries, M. Junker, Y. P. Chen, T. A. Corcovilos,

and R. G. Hulet

Categories: cond-mat.other

\\

We use a Feshbach resonance to tune the scattering length a of a

Bose-Einstein condensate of 7Li in the |F = 1, m_F = 1> state. Using the

spatial extent of the trapped condensate we extract a over a range spanning 7

decades from small attractive interactions to extremely strong repulsive

interactions. The shallow zero-crossing in the wing of the Feshbach resonance

enables the determination of a as small as 0.01 Bohr radii. In this regime,

evidence of the weak anisotropic magnetic dipole interaction is obtained by

comparison with different trap geometries.

\\ ( http://arxiv.org/abs/0811.4456 , 843kb)

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arXiv:0811.4498

Date: Thu, 27 Nov 2008 09:51:22 GMT (9kb)

Title: Ferminization of the Luttinger model with short-range interaction

Authors: V. V. Afonin (A. F. Ioffe Institute of the Russian Academy of

Sciences, Saint Petersburg, Russia), V. Yu. Petrov (Theory Division, Saint

Petersburg, Nuclear Physics)

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

Comments: paper 7 pages

\\

We present a transformation allowing one to represent the Luttenger model

with short range interacting as a free fermion problem. As well as a

bosonization procedure this approach permits one describe an excitation state

of the model. The electric charge and chirality of the new fermion is

discussed.

\\ ( http://arxiv.org/abs/0811.4498 , 9kb)

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arXiv:0811.4505

Date: Thu, 27 Nov 2008 10:39:16 GMT (236kb)

Title: Probing the excitation spectrum of nonresonantly pumped polariton

condensates

Authors: Michiel Wouters and Iacopo Carusotto

Categories: cond-mat.other

Comments: 7 pages, 5 figures

\\

We propose a four wave mixing experiment to probe the elementary excitation

spectrum of a non-equilibrium Bose-Einstein condensate of exciton-polaritons

under non-resonant pumping. Analytical calculations based on mean-field theory

show that this method is able to reveal the characteristic negative energy

feature of the Bogoliubov dispersion. Numerical simulations including the

finite spatial profile of the excitation laser spot and a weak disorder confirm

the practical utility of the method for realistic condensates.

\\ ( http://arxiv.org/abs/0811.4505 , 236kb)

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arXiv:0811.4515

Date: Thu, 27 Nov 2008 11:18:04 GMT (52kb)

Title: Phases and collective modes of hardcore Bose-Fermi mixture in an optical

lattice

Authors: S. Sinha and K. Sengupta

Categories: cond-mat.str-el

Comments: 10 pages 6 Figs v1

\\

We obtain the phase diagram of a Bose-Fermi mixture of hardcore spinless

Bosons and spin-polarized Fermions with nearest neighbor intra-species

interaction and on-site inter-species repulsion in an optical lattice at

half-filling using a slave-boson mean-field theory. We show that such a system

can have four possible phases which are a) supersolid Bosons coexisting with

Fermions in the Mott state, b) Mott state of Bosons coexisting with Fermions in

a metallic or charge-density wave state, c) a metallic Fermionic state

coexisting with superfluid phase of Bosons, and d) Mott insulating state of

Fermions and Bosons. We chart out the phase diagram of the system and provide

analytical expressions for the phase boundaries within mean-field theory. We

demonstrate that the transition between these phases are generically first

order with the exception of that between the supersolid and the Mott states

which is a continuous quantum phase transition. We also obtain the low-energy

collective excitations of the system in these phases. Finally, we study the

particle-hole excitations in the Mott insulating phase and use it to determine

the dynamical critical exponent $z$ for the supersolid-Mott insulator

transition. We discuss experiments which can test our theory.

\\ ( http://arxiv.org/abs/0811.4515 , 52kb)

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arXiv:0811.4567

Date: Thu, 27 Nov 2008 15:46:06 GMT (673kb)

Title: Stochastic classical field model for polariton condensates

Authors: Michiel Wouters and Vincenzo Savona

Categories: cond-mat.other

Comments: 10 pages, 7 figures

\\

We use the truncated Wigner approximation to derive stochastic classical

field equations for the description of polariton condensates. Our equations are

shown to reduce to the Boltzmann equation in the limit of low polariton

density. Monte Carlo simulations are performed to analyze the momentum

distribution and the first and second order coherence when the particle density

is varied across the condensation threshold.

\\ ( http://arxiv.org/abs/0811.4567 , 673kb)

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arXiv:0811.4696

Date: Fri, 28 Nov 2008 11:57:46 GMT (21kb)

Title: Hubbard model calculations of phase separation in optical lattices

Authors: H. Heiselberg

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

\\

Antiferromagnetic, Mott insulator, d-wave and gossamer superfluid phases are

calculated for 2D square lattices from the extended Hubbard (t-J-U) model using

the Gutzwiller projection method and renormalized mean field theory. Phase

separation between antiferromagnetic and d-wave superfluid phases is found near

half filling when the on-site repulsion exceeds $U\ga7.3t$, and coincides with

a first order transition in the double occupancy. Phase separation is thus

predicted for 2D optical lattices with ultracold Fermi atoms whereas it is

inhibited in cuprates by Coulomb frustration which instead may lead to stripes.

In a confined optical lattice the resulting density distribution is

discontinuous an with extended Mott plateau which enhances the

antiferromagnetic phase but suppresses the superfluid phase. Observation of

Mott insulator, antiferromagnetic, stripe and superfluid phases in density and

momentum distributions and correlations is discussed.

\\ ( http://arxiv.org/abs/0811.4696 , 21kb)

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arXiv:0811.3409

Date: Thu, 20 Nov 2008 20:39:04 GMT (1009kb)

Title: Coherent Patterning of Matter Waves with Subwavelength Localization

Authors: J. Mompart, V. Ahufinger, G. Birkl

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

Comments: 5 pages, 5 figures

\\

We introduce the Subwavelength Localization via Adiabatic Passage (SLAP)

technique to coherently achieve state-selective patterning and addressing of

matter waves. The SLAP technique consists in coupling two partially overlapping

and spatially structured laser fields to three internal levels of the matter

wave yielding state-selective localization at those positions where the

adiabatic passage process does not occur. We show that by means of this

technique matter wave localization down to the single nanometer can be

achieved. We analyze in detail the potential implementation of the SLAP

technique for nano-lithography with an atomic beam of metastable Ne* and for

coherent patterning of a two-component 87Rb Bose-Einstein condensate.

\\ ( http://arxiv.org/abs/0811.3409 , 1009kb)

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arXiv:0811.4517

Date: Thu, 27 Nov 2008 13:51:24 GMT (159kb)

Title: Towards surface quantum optics with Bose-Einstein condensates in

evanescent waves

Authors: Helmar Bender, Philippe Courteille, Claus Zimmermann, and Sebastian

Slama

Categories: quant-ph

\\

We present a surface trap which allows for studying the coherent interaction

of ultracold atoms with evanescent waves. The trap combines a magnetic Joffe

trap with a repulsive evanescent dipole potential. The position of the magnetic

trap can be controlled with high precision which makes it possible to move

ultracold atoms to the surface of a glass prism in a controlled way. The

optical potential of the evanescent wave compensates for the strong attractive

van der Waals forces and generates a potential barrier at only a few hundred

nanometers from the surface. The trap is tested with Rb Bose-Einstein

condensates (BEC), which are stably positioned at distances from the surfaces

below one micrometer.

\\ ( http://arxiv.org/abs/0811.4517 , 159kb)

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arXiv:0811.4608

Date: Thu, 27 Nov 2008 19:09:35 GMT (163kb)

Title: Superfluidity of a perfect quantum crystal

Authors: V.A. Golovko

Categories: quant-ph

Comments: 20 pages with 2 figures

\\

In recent years, experimental data were published which point to the

possibility of the existence of superfluidity in solid helium. To investigate

this phenomenon theoretically we employ a hierarchy of equations for reduced

density matrices which describes a quantum system that is in thermodynamic

equilibrium below the Bose-Einstein condensation point, the hierarchy being

obtained earlier by the author. It is shown that the hierarchy admits solutions

relevant to a perfect crystal (immobile) in which there is a frictionless flow

of atomes, which testifies to the possibility of superfluidity in solids. The

solutions are studied with the help of the bifurcation method and some their

peculiarities are found out. We discuss also various physical aspects of the

problem, among them experimental ones.

\\ ( http://arxiv.org/abs/0811.4608 , 163kb)

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arXiv:0811.4618

Date: Thu, 27 Nov 2008 21:05:22 GMT (166kb)

Title: Ultracold polar molecules near quantum degeneracy

Authors: S. Ospelkaus, K.-K. Ni, M. H. G. de Miranda, B. Neyenhuis, D. Wang, S.

Kotochigova, P. S. Julienne, D. S. Jin, and J. Ye

Categories: physics.atom-ph

\\

We report the creation and characterization of a near quantum-degenerate gas

of polar $^{40}$K-$^{87}$Rb molecules in their absolute rovibrational ground

state. Starting from weakly bound heteronuclear KRb Feshbach molecules, we

implement precise control of the molecular electronic, vibrational, and

rotational degrees of freedom with phase-coherent laser fields. In particular,

we coherently transfer these weakly bound molecules across a 125 THz frequency

gap in a single step into the absolute rovibrational ground state of the

electronic ground potential. Phase coherence between lasers involved in the

transfer process is ensured by referencing the lasers to two single components

of a phase-stabilized optical frequency comb. Using these methods, we prepare a

dense gas of $4\cdot10^4$ polar molecules at a temperature below 400 nK. This

fermionic molecular ensemble is close to quantum degeneracy and can be

characterized by a degeneracy parameter of $T/T_F=3$. We have measured the

molecular polarizability in an optical dipole trap where the trap lifetime

gives clues to interesting ultracold chemical processes. Given the large

measured dipole moment of the KRb molecules of 0.5 Debye, the study of quantum

degenerate molecular gases interacting via strong dipolar interactions is now

within experimental reach.

\\ ( http://arxiv.org/abs/0811.4618 , 166kb)

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arXiv:0812.0004

Date: Fri, 28 Nov 2008 21:20:51 GMT (2124kb)

Title: Ultracold gases far from equilibrium

Authors: Thomas Gasenzer

Categories: cond-mat.other

Comments: 59 pages, 26 figures; Compiled from notes for lectures held at 46.

Internationale Universitaetswochen fuer Theoretische Physik 2008 in

Schladming, Austria. To be published in Eur. Phys. J. Special Topics

\\

Ultracold atomic quantum gases belong to the most exciting challenges of

modern physics. Their theoretical description has drawn much from classical

field equations. These mean-field approximations are in general reliable for

dilute gases in which the atoms collide only rarely with each other, and for

situations where the gas is not too far from thermal equilibrium. With

present-day technology it is, however, possible to drive and observe a system

far away from equilibrium. Functional quantum field theory provides powerful

tools to achieve both, analytical understanding and numerical computability,

also in higher dimensions, of far-from-equilibrium quantum many-body dynamics.

In the article, an outline of these approaches is given, including methods

based on the two-particle irreducible effective action as well as on

renormalisation-group theory. Their relation to near-equilibrium kinetic theory

is discussed, and the distinction between quantum and classical statistical

fluctuations is shown to naturally emerge from the functional-integral

description. Example applications to the evolution of an ultracold atomic Bose

gas in one spatial dimension underline the power of the methods. The article is

compiled from the notes for lectures held at 46. Internationale

Universitaetswochen fuer Theoretische Physik 2008 in Schladming, Austria.

\\ ( http://arxiv.org/abs/0812.0004 , 2124kb)

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arXiv:0812.0079

Date: Sat, 29 Nov 2008 15:19:00 GMT (1461kb)

Title: Impurity crystal in a Bose-Einstein condensate

Authors: David C. Roberts and Sergio Rica

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

Comments: 5 pages, 3 color figures; Accepted to Phys. Rev. Lett

\\

We investigate the behavior of impurity fields immersed in a larger

condensate field in 1, 2, and 3 dimensions. We discuss the localization of a

single impurity field within a condensate and note the effects of surface

energy. We derive the functional form of the attractive interaction between two

impurities due to mediation from the condensate. Generalizing the analysis to

$N$ impurity fields, we show that within various parameter regimes a crystal of

impurity fields can form spontaneously in the condensate. Finally, the system

of condensate and crystallized impurity structure is shown to have nonclassical

rotational inertia, which is characteristic of superfluidity, i.e. the system

can be seen to exhibit supersolid behavior.

\\ ( http://arxiv.org/abs/0812.0079 , 1461kb)

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arXiv:0812.0239

Date: Mon, 1 Dec 2008 08:08:47 GMT (61kb)

Title: Collective modes of trapped Fermi gases with in-medium interaction

Authors: S.Chiacchiera, T.Lepers, M.Urban, D.Davesne

Categories: cond-mat.other

Comments: 17 pages

\\

Due to Pauli blocking of intermediate states, the scattering matrix (or T

matrix) of two fermionic atoms in a Fermi gas becomes different from that of

two atoms in free space. This effect becomes particularly important near a

Feshbach resonance, where the interaction in free space is very strong but

becomes effectively suppressed in the medium. We calculate the in-medium T

matrix in ladder approximation and study its effects on the properties of

collective modes of a trapped gas in the normal-fluid phase. We introduce the

in-medium interaction on both sides of the Boltzmann equation, namely in the

calculation of the mean field and in the calculation of the collision rate.

With mean field inclusion, we can considerably improve the agreement with

measured temperature dependence of frequency and damping rate of the scissors

mode. In addition, we compute frequencies and damping rates of the radial

quadrupole and compression modes.

\\ ( http://arxiv.org/abs/0812.0239 , 61kb)

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arXiv:0812.0246

Date: Mon, 1 Dec 2008 09:26:43 GMT (228kb)

Title: Bose-Einstein condensate in a quartic potential: Static and Dynamic

properties

Authors: G. K. Chaudhary, Amit K Chattopadhyay, R. Ramakumar

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

Comments: 10 pages, including figures

\\

In this paper, we present a theoretical study of a Bose-Einstein condensate

of interacting bosons in a quartic trap in one, two, and three dimensions.

Using Thomas-Fermi approximation, suitably complemented by numerical solutions

of the Gross-Pitaevskii equation, we study the ground sate condensate density

profiles, the chemical potential, the effects of cross-terms in the quartic

potential, temporal evolution of various energy components of the condensate,

and width oscillations of the condensate. Results obtained are compared with

corresponding results for a bose condensate in a harmonic confinement.

\\ ( http://arxiv.org/abs/0812.0246 , 228kb)

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arXiv:0812.0268

Date: Mon, 1 Dec 2008 11:03:02 GMT (835kb)

Title: Drag force on an oscillating object in quantum turbulence

Authors: Shoji Fujiyama and Makoto Tsubota

Categories: cond-mat.other

Comments: 7 pages, 5 figures, 1 table

\\

This paper reports results of the computation of the drag force exerted on an

oscillating object in quantum turbulence in superfluid $^4$He.

The drag force is calculated on the basis of numerical simulations of quantum

turbulent flow about the object. The drag force is proportional to the square

of the magnitude of the oscillation velocity, which is similar to that in

classical turbulence at high Reynolds number. The drag coefficient is also

calculated, and its value is found to be of the same order as that observed in

previous experiments. The correspondence between quantum and classical

turbulence is further clarified by examining the turbulence created by

oscillating objects.

\\ ( http://arxiv.org/abs/0812.0268 , 835kb)

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arXiv:0812.0278

Date: Mon, 1 Dec 2008 12:13:16 GMT (1756kb)

Title: Ferrofluidity in a two-component dipolar Bose-Einstein Condensate

Authors: Hiroki Saito, Yuki Kawaguchi, Masahito Ueda

Categories: cond-mat.other

Comments: 4 pages, 6 figures

\\

It is shown that the interface in a two-component Bose-Einstein condensate

(BEC) in which one component exhibits a dipole-dipole interaction spontaneously

forms patterns similar to those formed in a magnetic liquid subject to a

magnetic field. A hexagonal pattern, hysteretic behavior, and soliton-like

structure are numerically demonstrated. A phenomenon similar to the

labyrinthine instability is also found. These phenomena may be realized using a

52Cr BEC. The periodic density modulation in the superfluid ground state offers

evidence of supersolidity.

\\ ( http://arxiv.org/abs/0812.0278 , 1756kb)

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arXiv:0812.0356

Date: Mon, 1 Dec 2008 20:47:06 GMT (140kb)

Title: Shining a Light on Bose--Hubbard Mixtures

Authors: M. J. Bhaseen, M. Hohenadler, A. O. Silver, B. D. Simons

Categories: cond-mat.str-el

Comments: 6 pages, 3 figures

\\

Motivated by recent experiments on cold atomic gases in ultra high finesse

optical cavities, we consider the problem of a two-band Bose--Hubbard model

coupled to quantum light. Photoexcitation promotes carriers between the bands

and we study the non-trivial interplay between Mott insulating behavior and

superfluidity. The model displays a global U(1) X U(1) symmetry which supports

the coexistence of Mott insulating and superfluid phases, and yields a rich

phase diagram with multicritical points. This symmetry property is shared by

several other problems of current experimental interest, including

two-component Bose gases in optical lattices, and the bosonic BEC-BCS crossover

problem for atom-molecule mixtures induced by a Feshbach resonance. We

corroborate our findings by numerical simulations.

\\ ( http://arxiv.org/abs/0812.0356 , 140kb)

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arXiv:0812.0303

Date: Mon, 1 Dec 2008 14:30:35 GMT (30kb)

Title: End-to-end entanglement in Bose-Hubbard chains

Authors: Jose Reslen and Sougato Bose

Categories: quant-ph

Comments: 4 pages, 4 figures

\\

We study the ground state as well as the dynamics of chains of bosons with

local interaction and nearest-neighbour exchange using numerical techniques

based on renormalization group methods. We explore the development of

entanglement between the sites at the ends of such chains as mechanisms are

invoked to concentrate population in these sites. We find that long-range

entanglement arises in chains with strong repulsion constants in the

intermediate sites, both in ground state and through non-equilibrium dynamics.

Additionally, it is shown that entanglement between the end sites can be made

to increase above their ground state values by adding a perturbation.

\\ ( http://arxiv.org/abs/0812.0303 , 30kb)

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arXiv:0812.0090

Date: Sat, 29 Nov 2008 16:52:44 GMT (1281kb,D)

Title: All-optical 3D atomic loops generated with Bessel light fields

Authors: K. Volke-Sepulveda and R. Jauregui

Categories: physics.atom-ph physics.optics

Comments: 13 pages, 9 figures

\\

The propagation invariance of Bessel beams as well as their transversal

structure are used to perform a comparative analysis of their effect on cold

atoms for four different configurations and combinations thereof. We show that,

even at temperatures for which the classical description of the atom center of

mass motion is valid, the interchange of momentum, energy and orbital angular

momentum between light and atoms yields efficient tools for all-optical

trapping, transporting and, in general, manipulating the state of motion of

cold atoms.

\\ ( http://arxiv.org/abs/0812.0090 , 1281kb)

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arXiv:0812.0231

Date: Mon, 1 Dec 2008 07:01:46 GMT (58kb)

Title: Measurement of the quadratic Zeeman shift of ^{85}Rb hyperfine sublevels

using stimulated Raman transitions

Authors: Run-Bing Li, Lin Zhou, Jin Wang, Ming-Sheng Zhan

Categories: physics.atom-ph

\\

We demonstrate a technique for directly measuring the quadratic Zeeman shift

using stimulated Raman transitions.The quadratic Zeeman shift has been measured

yielding [delta][nju] = 1296.8 +/-3.3 Hz/G^{2} for magnetically insensitive

sublevels (5S1/2, F = 2,mF = 0 -> 5S1/2, F = 3,mF = 0) of ^{85}Rb by

compensating the magnetic eld and cancelling the ac Stark shift. We also

measured the cancellation ratio of the differential ac Stark shift due to the

imbalanced Raman beams by using two pairs of Raman beams ([sigma]^{+},

[sigma]^{+}) and it is 1:3.67 when the one-photon detuning is 1.5 GHz in the

experiment.

\\ ( http://arxiv.org/abs/0812.0231 , 58kb)

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arXiv:0812.0266

Date: Mon, 1 Dec 2008 10:59:40 GMT (494kb)

Title: Threshold of a Photonic Random Laser with Cold Atoms

Authors: Luis S. Froufe-P\'erez, William Guerin (INLN), R\'emi Carminati

(LPEM), Robin Kaiser (INLN)

Categories: physics.atom-ph physics.optics

\\

We address the problem of achieving a photonic random laser with a cloud of

cold atoms, in which gain and scattering are provided by the same atoms. The

lasing threshold can be defined using the on-resonance optical thickness b0 as

a single critical parameter. We predict the threshold quantitatively, as well

as power and frequency of the emitted light, using two different light

transport models and the atomic polarizability of a strongly-pumped two-level

atom. We find a critical b0 on the order of 300, which is within reach of

state-of-the-art cold-atom experiments. Interestingly, we find that random

lasing can already occur in a regime of relatively low scattering.

\\ ( http://arxiv.org/abs/0812.0266 , 494kb)

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arXiv:0812.0493

Date: Tue, 2 Dec 2008 12:49:52 GMT (368kb)

Title: Dynamical formation and interaction of bright solitary waves and

solitons in the collapse of Bose-Einstein condensates with attractive

interactions

Authors: B.J. Dabrowska-Wuester, S. Wuester and M.J. Davis

Categories: cond-mat.other

Comments: 14 pages, 5 figures

\\

We model the dynamics of formation of multiple, long-lived, bright solitary

waves in the collapse of Bose-Einstein condensates with attractive interactions

as studied in the experiment of Cornish et al. [Phys. Rev. Lett. 96 (2006)

170401]. Using both mean-field and quantum field simulation techniques, we find

that while a number of separated wave packets form as observed in the

experiment, they do not have a repulsive \pi phase difference that has been

previously inferred. We observe that the inclusion of quantum fluctuations

causes soliton dynamics to be predominantly repulsive in one dimensional

simulations independent of their initial relative phase. However, indicative

three-dimensional simulations do not support this conclusion and in fact show

that quantum noise has a negative impact on bright solitary wave lifetimes.

Finally, we show that condensate oscillations, after the collapse, may serve to

deduce three-body recombination rates, and that the remnant atom number may

still exceed the critical number for collapse for as long as three seconds

independent of the relative phases of the bright solitary waves.

\\ ( http://arxiv.org/abs/0812.0493 , 368kb)

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arXiv:0812.0532

Date: Tue, 2 Dec 2008 20:46:21 GMT (83kb)

Title: Coherent pumping of a Mott insulator: Fermi golden rule versus Rabi

oscillations

Authors: Fabian Hassler and Sebastian D. Huber

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

Comments: 4 pages, 3 figures

\\

Cold atoms provide a unique arena to study many-body systems far from

equilibrium. Furthermore, novel phases in cold atom systems are conveniently

investigated by dynamical probes pushing the system out of equilibrium. Here,

we discuss the pumping of doubly-occupied sites in a fermionic Mott insulator

by a periodic modulation of the hopping amplitude. We show that deep in the

insulating phase the many-body system can be mapped onto an effective two-level

system which performs coherent Rabi oscillations due to the driving. Coupling

the two-level system to the remaining degrees of freedom renders the Rabi

oscillations damped. We compare this scheme to an alternative description where

the particles are incoherently pumped into a broad continuum.

\\ ( http://arxiv.org/abs/0812.0532 , 83kb)

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arXiv:0812.0561

Date: Tue, 2 Dec 2008 18:07:26 GMT (164kb)

Title: Time evolution of correlations in strongly interacting fermions after a

quantum quench

Authors: Salvatore R. Manmana, Stefan Wessel, Reinhard M. Noack, and Alejandro

Muramatsu

Categories: cond-mat.str-el

Comments: 10 figures, submitted to Phys. Rev. B

\\

Using the adaptive time-dependent density matrix renormalization group, we

study the time evolution of density correlations of interacting spinless

fermions on a one-dimensional lattice after a sudden change in the interaction

strength. Over a broad range of model parameters, the correlation function

exhibits a characteristic light-cone-like time evolution representative of a

ballistic transport of information. Such behavior is observed both when

quenching an insulator into the metallic region and also when quenching within

the insulating region. However, when a metallic state beyond the quantum

critical point is quenched deep into the insulating regime, no indication for

ballistic transport is observed. Instead, stable domain walls in the density

correlations emerge during the time evolution, consistent with the predictions

of the Kibble-Zurek mechanism.

\\ ( http://arxiv.org/abs/0812.0561 , 164kb)

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arXiv:0812.0361

Date: Mon, 1 Dec 2008 21:00:13 GMT (76kb)

Title: Stimulated Raman adiabatic passage analogs in classical physics

Authors: A. A. Rangelov, N. V. Vitanov, and B. W. Shore

Categories: quant-ph

\\

Stimulated Raman adiabatic passage (STIRAP) is a well established technique

for producing coherent population transfer in a three-state quantum system. We

here exploit the resemblance between the Schrodinger equation for such a

quantum system and the Newton equation of motion for a classical system

undergoing torque to discuss several classical analogs of STIRAP, notably the

motion of a moving charged particle subject to the Lorentz force of a

quasistatic magnetic field, the orientation of a magnetic moment in a slowly

varying magnetic field, the Coriolis effect and the inertial frame dragging

effect. Like STIRAP, those phenomena occur for counterintuitively ordered field

pulses and are robustly insensitive to small changes in the interaction

properties.

\\ ( http://arxiv.org/abs/0812.0361 , 76kb)

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arXiv:0812.0429

Date: Tue, 2 Dec 2008 04:54:58 GMT (634kb)

Title: Photonic Feshbach Resonance

Authors: D.Z. Xu, H. Ian, T. Shi, H. Dong and C.P. Sun

Categories: quant-ph

\\

Hermann Feshbach predicted fifty years ago that when two atomic nuclei are

scattered within an open entrance channel-- the state observable at infinity,

they may enter an intermediate closed channel -- the locally bounded state of

the nuclei. If the energy of a bound state of in the closed channel is

fine-tuned to match the relative kinetic energy, then the open channel and the

closed channel "resonate", so that the scattering length becomes divergent. We

find that this so-called Feshbach resonance phenomenon not only exists during

the collisions of massive particles, but also emerges during the coherent

transport of massless particles, that is, photons confined in the coupled

resonator arrays \cite{lzhou08}. We implement the open and the closed channels

inside a pair of such arrays, linked by a separated cavity or a tunable qubit.

When a single photon is bounded inside the closed channel by setting the

relevant physical parameters appropriately, the vanishing transmission appears

to display this photonic Feshbach resonance. The general construction can be

implemented through various experimentally feasible solid state systems, such

as the couple defected cavities in photonic crystals. The numerical simulation

based on finite-different time-domain(FDTD) method confirms our conceive about

physical implementation.

\\ ( http://arxiv.org/abs/0812.0429 , 634kb)

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arXiv:0812.0499

Date: Tue, 2 Dec 2008 13:13:19 GMT (43kb)

Title: Interferometry using spinor Bose-Einstein condensates

Authors: R. Vasile, H. Makela, K.-A. Suominen

Categories: quant-ph

Comments: 6 Pages, 1 figure

\\

We study the time-evolution of an optically trapped spinor Bose-Einstein

condensate under the influence of a dominating magnetic bias field in the

z-direction, and a perpendicular smaller field that couples the spinor states.

We show that if the bias field depends quadratically on time, the relative

phases of the spinor components affect the populations of the final state. This

allows one to measure the differences in the time-evolution of the relative

phases, thereby realizing a multi-arm interferometer in a spinor Bose-Einstein

condensate.

\\ ( http://arxiv.org/abs/0812.0499 , 43kb)

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arXiv:0812.0684

Date: Wed, 3 Dec 2008 10:22:24 GMT (33kb)

Title: Photon-assisted tunneling in optical lattices: Ballistic transport of

interacting boson pairs

Authors: Christoph Weiss (LKB - Lhomond), Heinz-Peter Breuer

Categories: cond-mat.other

Comments: 7 pages, 3 figures

\\

In a recent experiment [PRL 100, 040404 (2008)] an analog of photon-assisted

tunneling has been observed for a Bose-Einstein condensate in an optical

lattice subject to a constant force plus a sinusoidal shaking. Contrary to

previous theoretical predictions, the width of the condensate was measured to

be proportional to the square of the effective tunneling matrix element, rather

than a linear dependence. For a simple model of two interacting bosons in a

one-dimensional optical lattice, both analytical and numerical calculations

indicate that such a transition from a linear to a quadratic dependence can be

interpreted through the ballistic transport and the corresponding exact

dispersion relation of bound boson pairs.

\\ ( http://arxiv.org/abs/0812.0684 , 33kb)

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\\

arXiv:0812.0815

Date: Wed, 3 Dec 2008 21:07:07 GMT (284kb)

Title: Fermion induced superfluid decoherence in the boson Hubbard model on an

optical lattice

Authors: Roman M. Lutchyn, Sumanta Tewari, S. Das Sarma

Categories: cond-mat.str-el

Comments: 4 pages, 1 eps figure

\\

We study the phase diagram of a degenerate gas of bosons in an optical

lattice, described by the boson Hubbard Hamiltonian, interacting with

spin-polarized fermions. Virtual transitions of the bosons to the higher Bloch

bands, coupled with the contact interspecies interactions of either sign,

result in an effective increase of the bosonic on-site repulsion. If this

renormalization of the on-site potential is dominant over the fermionic

screening of the boson interactions, superfluid coherence of the Bose-Hubbard

system will be reduced by the fermions. We discuss experimental implications

for cold atomic systems.

\\ ( http://arxiv.org/abs/0812.0815 , 284kb)

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\\

arXiv:0812.0863

Date: Thu, 4 Dec 2008 07:44:50 GMT (574kb)

Title: Spontaneous Radiation and Amplification of Kelvin Waves on Quantized

Vortices in Bose--Einstein Condensates

Authors: Hiromitsu Takeuchi, Kenichi Kasamatsu, and Makoto Tsubota

Categories: cond-mat.other

Comments: 5 pages, 5 figures

\\

We propose a new type of Landau instability in trapped Bose-Einstein

condensates by a helically moving environment. In the presence of quantized

vortices, the instability can cause spontaneous radiation and amplification of

Kelvin waves. This study gives the microscopic understanding of the

Donnelly--Glaberson instability which was known as a hydrodynamic instability

in superfluid helium.

The Donnelly--Glaberson instability can be a powerful tool for observing the

dispersion relation of Kelvin waves, vortex reconnections, and quantum

turbulence in atomic Bose--Einstein condensates.

\\ ( http://arxiv.org/abs/0812.0863 , 574kb)

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\\

arXiv:0812.0948

Date: Thu, 4 Dec 2008 14:43:14 GMT (279kb)

Title: Dynamical properties of dipolar Fermi gases

Authors: T Sogo, L He, T Miyakawa, S Yi, H Lu and H Pu

Categories: cond-mat.other

Comments: 14 pages, 8 figures, submitted to New J. Phys

\\

We investigate dynamical properties of a one-component Fermi gas with

dipole-dipole interaction between particles. Using a variational function based

on the Thomas-Fermi density distribution in phase space representation, the

total energy is described by a function of deformation parameters in both real

and momentum space. Various thermodynamic quantities of a uniform dipolar Fermi

gas are derived, and then instability of this system is discussed. For a

trapped dipolar Fermi gas, the collective oscillation frequencies are derived

with the energy-weighted sum rule method. The frequencies for the monopole and

quadrupole modes are calculated, and softening against collapse is shown as the

dipolar strength approaches the critical value. Finally, we investigate the

effects of the dipolar interaction on the expansion dynamics of the Fermi gas

and show how the dipolar effects manifest in an expanded cloud.

\\ ( http://arxiv.org/abs/0812.0948 , 279kb)

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\\

arXiv:0812.0953

Date: Thu, 4 Dec 2008 18:21:31 GMT (210kb)

Title: Bose-Einstein condensation of magnons under incoherent pumping

Authors: A.V. Chumak, G.A. Melkov, V.E. Demidov, O. Dzyapko, V.L. Safonov, and

S.O. Demokritov

Categories: cond-mat.other

\\

Bose-Einstein condensation in a gas of magnons pumped by an incoherent

pumping source is experimentally studied at room temperature. We demonstrate

that the condensation can be achieved in a gas of bosons under conditions of

incoherent pumping. Moreover, we show the critical transition point is almost

independent of the frequency spectrum of the pumping source and is solely

determined by the density of magnons. The electromagnetic power radiated by the

magnon condensate was found to scale quadratically with the pumping power,

which is in accordance with the theory of Bose-Einstein condensation in magnon

gases.

\\ ( http://arxiv.org/abs/0812.0953 , 210kb)

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\\

arXiv:0812.0973

Date: Thu, 4 Dec 2008 16:21:58 GMT (642kb)

Title: Sculpting the Vortex State of a Spinor BEC

Authors: K. C. Wright, L. S. Leslie, A. Hansen, N. P. Bigelow

Categories: cond-mat.other

Comments: 4 pages, 6 figures, accepted to PRL

\\

We use Raman-detuned laser pulses to achieve spatially-varying control of the

amplitude and phase of the spinor order parameter of a Bose-Einstein

condensate. We present experimental results confirming precise radial and

azimuthal control of amplitude and phase during the creation of

vortex-antivortex superposition states.

\\ ( http://arxiv.org/abs/0812.0973 , 642kb)

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\\

arXiv:0812.0983

Date: Thu, 4 Dec 2008 16:52:51 GMT (64kb)

Title: Mechanical and superfluid properties of dislocations in solid He4

Authors: D. Aleinikava, E. Dedits, A. B. Kuklov, D. Schmeltzer

Categories: cond-mat.stat-mech

Comments: 4 pages with 2 figures

\\

Dislocations are shown to be smooth at zero temperature because of the

effective Coulomb-type interaction between kinks. Crossover to finite

temperature rougnehing is suggested to be a mechanism responsible for the

softening of \he4 shear modulus recently observed by Day and Beamish (Nature,

{\bf 450}, 853 (2007)). We discuss also that strong suppresion of superfuidity

along the dislocation core by thermal kinks can lead to locking in of the

mechanical and superfluid responses.

\\ ( http://arxiv.org/abs/0812.0983 , 64kb)

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\\

arXiv:0812.0999

Date: Thu, 4 Dec 2008 18:20:45 GMT (6kb)

Title: The macroscopic qubit delusion

Authors: Robert Alicki

Categories: quant-ph

Comments: 4 pages, no figures

\\

There exists a large number of experimental and theoretical results

supporting the picture of "macroscopic qubits" implemented, for instance, by

Rydberg atoms, Josephson junctions or Bose-Einstein condensates - the systems

which should rather emerge in localized semiclassical states. In this note it

is shown how, under realistic conditions, the false qubit interpretation can be

consistent with the restricted set of experimental data collected for

semiclassical systems. The recent experiments displaying semiclassical

character of Bose-Einstein condensates and possible quantumness tests for a

single system are briefly invoked also.

\\ ( http://arxiv.org/abs/0812.0999 , 6kb)

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\\

arXiv:0812.1002

Date: Thu, 4 Dec 2008 18:40:20 GMT (752kb)

Title: Formation of ultracold dipolar molecules in the lowest vibrational

levels by photoassociation

Authors: J. Deiglmayr, M. Repp, A. Grochola, K. M\"ortlbauer, C. Gl\"uck, O.

Dulieu, J. Lange, R. Wester, and M. Weidem\"uller

Categories: physics.atom-ph

Comments: Submitted to Faraday Discussions 142: Cold and Ultracold Molecules 18

pages, 8 figures

\\

We recently reported the formation of ultracold LiCs molecules in the

rovibrational ground state X1Sigma+,v''=0,J''=0 [J. Deiglmayr et al., PRL 101,

133004 (2008)]. Here we discuss details of the experimental setup and present a

thorough analysis of the photoassociation step including the photoassociation

line shape. We predict the distribution of produced ground state molecules

using accurate potential nergy curves combined with an ab-initio dipole

transition moment and compare this prediction with experimental ionization

spectra. Additionally we improve the value of the dissociation energy for the

X1Sigma+ state by high resolution spectroscopy of the vibrational ground state.

\\ ( http://arxiv.org/abs/0812.1002 , 752kb)

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\\

arXiv:0812.0741

Date: Wed, 3 Dec 2008 15:35:31 GMT (9kb)

Title: On the Lieb-Liniger model in the infinite coupling constant limit

Authors: Stephane Ouvry, Alexios P. Polychronakos

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

\\

We consider the one-dimensional Lieb-Liniger model (bosons interacting via

2-body delta potentials) in the infinite coupling constant limit (the so-called

Tonks-Girardeau model). This model might be relevant as a description of atomic

Bose gases confined in a one-dimensional geometry. It is known to have a

fermionic spectrum since the N-body wavefunctions have to vanish at coinciding

points, and therefore be symmetrizations of fermionic Slater wavefunctions. We

argue that in the infinite coupling constant limit the model is

indistinguishable from free fermions, i.e., all physically accessible

observables are the same as those of free fermions. Therefore, Bose-Einstein

condensate experiments at finite energy that preserve the one-dimensional

geometry cannot test any bosonic characteristic of such a model.

\\ ( http://arxiv.org/abs/0812.0741 , 9kb)

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\\

arXiv:0812.1019 (*cross-listing*)

Date: Thu, 4 Dec 2008 20:51:25 GMT (57kb,D)

Title: A versatile and reliably re-usable ultrahigh vacuum viewport

Authors: K. J. Weatherill, J. D. Pritchard, C. S. Adams, P. F. Griffin, U.

Dammalapati and E. Riis

Categories: physics.ins-det physics.atom-ph

\\

We present a viewport for use in Ultra-high vacuum (UHV) based upon the

preflattened solder seal design presented in earlier work, Cox et al. Rev. Sci.

Inst. 74, 3185 (2003). The design features significant modifications to improve

long term performance. The windows have been leak tested to less than 10^-10

atm cm^3/s . From atom number measurements in an optical dipole trap loaded

from a vapor cell magneto-optical trap (MOT) inside a vacuum chamber

accommodating these viewports, we measure a trap lifetime of 9.5s suggesting a

pressure of around 10^-10 Torr limited by background Rubidium vapor pressure.

We also present a simplified design where the UHV seal is made directly to a

vacuum pipe

\\ ( http://arxiv.org/abs/0812.1019 , 57kb)

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\\

arXiv:0811.4678

Date: Fri, 28 Nov 2008 10:18:00 GMT (6kb)

Title: Mathematics underlying the 2008 financial crisis, and a possible remedy

Authors: V. P. Maslov (1 and 2) and V. E. Nazaikinskii (2) ((1) Moscow State

University, (2) Institute for Problems in Mechanics, RAS, Moscow)

Categories: physics.soc-ph

Comments: 8 pages, no figures

\\

Among the diverse factors contributing to the current financial and

economical crisis, there is a purely mathematical law not mentioned by

economists. The indistinguishability of identical notes results in a

condensation phenomenon (also known in a completely different situation in

physics as Bose condensation): if the total amount of money in circulation

exceeds a certain threshold (depending on various economic factors), then a

collapse occurs. One possible remedy is to introduce several currencies to be

used simultaneously; we show that this raises the threshold and thus might help

at least to postpone the crisis. If each of the United States were to use its

own unique currency along with the dollar, the threshold would be up to seven

times higher, and the crisis may not have happened yet. The former abandonment

of national currencies in euro countries in favor of one unique European money

could also be viewed as an unfavorable factor in the development of the crisis.

\\ ( http://arxiv.org/abs/0811.4678 , 6kb)

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The replacements:

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\\

arXiv:0810.0482

replaced with revised version Fri, 28 Nov 2008 17:09:47 GMT (76kb)

Title: Critical temperature of non-interacting Bose gases on disordered

lattices

Authors: L. Dell'Anna, S. Fantoni, P. Sodano, A. Trombettoni

Categories: cond-mat.stat-mech cond-mat.dis-nn

Comments: 18 pages, 8 figures; Fig. 8 improved adding results for another value

of q (q=830/1076)

Journal-ref: J. Stat. Mech. P11012 (2008)

DOI: 10.1088/1742-5468/2008/11/P11012

\\ ( http://arxiv.org/abs/0810.0482 , 76kb)

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\\

arXiv:0710.4627

replaced with revised version Thu, 27 Nov 2008 09:19:51 GMT (153kb)

Title: Functional renormalisation group approach to far-from-equilibrium

quantum field dynamics

Authors: Thomas Gasenzer and Jan M. Pawlowski

Categories: cond-mat.other hep-ph hep-th

Comments: 6 pages, RevTeX, 5 figures, published version

Report-no: HD-THEP-07-31

Journal-ref: Phys. Lett. B 670, 135 (2008)

DOI: 10.1016/j.physletb.2008.10.049

\\ ( http://arxiv.org/abs/0710.4627 , 153kb)

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\\

arXiv:cond-mat/0608472

replaced with revised version Mon, 1 Dec 2008 14:06:59 GMT (23kb)

Title: Conserving Gapless Mean-Field Theory of a Multi-Component Bose-Einstein

Condensate

Authors: Yoshiyuki Kondo, Takafumi Kita

Categories: cond-mat.stat-mech

Comments: 8 pages, 7 figures Minor errors removed

Journal-ref: J. Phys. Soc. Jpn. 76, 024008 (2007)

\\ ( http://arxiv.org/abs/cond-mat/0608472 , 23kb)

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\\

arXiv:0803.0559

replaced with revised version Sat, 29 Nov 2008 17:25:37 GMT (239kb,D)

Title: Simulation of an inhomogeneous Fermi gas through the BCS-BEC crossover

Authors: R. Jauregui, R. Paredes, L. Rosales-Zarate, and G. Toledo Sanchez

Categories: cond-mat.other

Comments: 15 pages,7 figures Comparison with results predicted by a recent

virial theorem is made. New relevant references are added

\\ ( http://arxiv.org/abs/0803.0559 , 239kb)

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\\

arXiv:0804.4003

replaced with revised version Mon, 1 Dec 2008 17:17:02 GMT (24kb)

Title: Adiabatic nonlinear probes of one-dimensional Bose gases

Authors: C. De Grandi, R. A. Barankov, A. Polkovnikov

Categories: cond-mat.other

Comments: 4 pages, 3 figures, final version

\\ ( http://arxiv.org/abs/0804.4003 , 24kb)

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\\

arXiv:0807.3698

replaced with revised version Mon, 1 Dec 2008 14:35:49 GMT (106kb)

Title: Quantum Diffusion of Matter Waves in 2D Speckle Potentials

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

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

Comments: some structural changes and corrected fig. 2, final version

\\ ( http://arxiv.org/abs/0807.3698 , 106kb)

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\\

arXiv:0808.3932

replaced with revised version Mon, 1 Dec 2008 15:04:45 GMT (96kb)

Title: Nonlinear transmission through a tapered fiber in rubidium vapor

Authors: S.M. Hendrickson, T.B. Pittman and J.D. Franson

Categories: quant-ph

Comments: 10 pages, 4 figures

\\ ( http://arxiv.org/abs/0808.3932 , 96kb)

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\\

arXiv:0811.4216

replaced with revised version Sun, 30 Nov 2008 02:20:38 GMT (1926kb)

Title: Exact coherent matter-wave soliton induced and controlled by laser field

Authors: Wenhua Hai, Qiongtao Xie, Qianquan Zhu

Categories: quant-ph

Comments: 4 pages, 4figures

\\ ( http://arxiv.org/abs/0811.4216 , 1926kb)

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\\

arXiv:0808.0150

replaced with revised version Tue, 2 Dec 2008 13:02:14 GMT (205kb)

Title: Particle-hole fluctuations in the BCS-BEC Crossover

Authors: S. Floerchinger, M. Scherer, S. Diehl and C. Wetterich

Categories: cond-mat.supr-con

Comments: 11 pages, 6 figures. Reference added

Journal-ref: Phys. Rev. B 78, 174528 (2008)

DOI: 10.1103/PhysRevB.78.174528

\\ ( http://arxiv.org/abs/0808.0150 , 205kb)

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\\

arXiv:0809.1984

replaced with revised version Tue, 2 Dec 2008 12:50:27 GMT (46kb,D)

Title: Excess noise depletion of a Bose-Einstein condensate in an optical

cavity

Authors: G. Szirmai, D. Nagy, P. Domokos

Categories: quant-ph

Comments: 4 pages, 2 figures included in text

\\ ( http://arxiv.org/abs/0809.1984 , 46kb)

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\\

arXiv:0806.1885

replaced with revised version Wed, 3 Dec 2008 10:07:55 GMT (1109kb)

Title: Unitary polarized Fermi gas under adiabatic rotation

Authors: I. Bausmerth, A. Recati, S. Stringari

Categories: cond-mat.other

Comments: 8 pages, 11 figures, discussion added according to referee report,

final version as published

Journal-ref: Physical Review A 78, 063603 (2008)

DOI: 10.1103/PhysRevA.78.063603

\\ ( http://arxiv.org/abs/0806.1885 , 1109kb)

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\\

arXiv:0806.2865

replaced with revised version Wed, 3 Dec 2008 01:01:02 GMT (51kb)

Title: Boson Hubbard model with weakly coupled Fermions

Authors: R. M. Lutchyn, S. Tewari, and S. Das Sarma

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

Comments: 4 pages, 1 figure; final version as published in PRB

\\ ( http://arxiv.org/abs/0806.2865 , 51kb)

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\\

arXiv:0710.5631

replaced with revised version Thu, 4 Dec 2008 16:25:09 GMT (59kb)

Title: Scheme for implementing atomic multiport devices

Authors: Jessica J. Cooper, David W. Hallwood, Jacob A. Dunningham

Categories: quant-ph

Comments: 21 pages, 7 figures

\\ ( http://arxiv.org/abs/0710.5631 , 59kb)

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Till next time,

Matt.

-- ========================================================================= Dr M. J. Davis, Associate Professor in Physics School of Mathematics and Physics, ph : +61 7 334 69824 The University of Queensland, fax : +61 7 336 51242 Brisbane, QLD 4072, mdavis_at_physics.uq.edu.au Australia. 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 Mon Jan 12 2009 - 10:24:29 EST

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