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

Date: Thu, 13 Jul 2006 18:00:56 +1000 (EST)

Date: Thu, 13 Jul 2006 18:00:56 +1000 (EST)

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

Hi all,

I'm getting on a plane bound for Innsbruck tomorrow, and so I decided to send

out an arXiv email today. The next one probably won't be until Monday 24th

July, or possibly even later.

Home page: http://www.physics.uq.edu.au/people/mdavis/matts_arXiv/

The abstracts:

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Paper: cond-mat/0607179

Date: Fri, 7 Jul 2006 01:59:06 GMT (281kb)

Title: Visualization of vortex bound states in polarized Fermi gases at

unitarity

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

Comments: 5pages, 4 figures, submitted to the AIP 17th National Congress (2006)

on June 12th

Subj-class: Superconductivity; Statistical Mechanics

\\

We analyse theoretically a single vortex in 3D trapped atomic Fermi gases

with population polarization near a broad Feshbach resonance. Above a critical

polarization the Andreev-like bound states inside the core become occupied for

the majority component. As a result, the local density difference at the core

center acquires a sudden rise at low temperautres. This provides a

visualization of the lowest bound state within the absorption imaging

technique. As the polarization increases, the core expands gradually, and

correspondingly, the energy of the lowest bound state decreases.

\\ ( http://arXiv.org/abs/cond-mat/0607179 , 281kb)

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Paper: cond-mat/0607184

Date: Fri, 7 Jul 2006 08:41:56 GMT (259kb)

Title: Broken axisymmetry phase of a spin-1 ferromagnetic Bose-Einstein

condensate

Authors: Keiji Murata, Hiroki Saito, and Masahito Ueda

Comments: 11 pages, 6 figures

Subj-class: Other

\\

A spin-1 ferromagnetic Bose-Einstein condensate subject to a certain magnetic

field exhibits a broken-axisymmetry phase in which the magnetization tilts

against the applied magnetic field due to the competition between

ferromagnetism and linear and quadratic Zeeman effects. The Bogoliubov analysis

shows that in this phase two Goldstone modes associated with U(1) and SO(2)

symmetry breakings exist, in which phonons and magnons are coupled to restore

the two broken symmetries.

\\ ( http://arXiv.org/abs/cond-mat/0607184 , 259kb)

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Paper: cond-mat/0607195

Date: Fri, 7 Jul 2006 14:24:45 GMT (98kb)

Title: Landau and dynamical instabilities of Bose-Einstein condensates with

superfluid flow in a Kronig-Penney potential

Authors: Ippei Danshita and Shunji Tsuchiya

Comments: 6 pages, 2 figures, Proceedings of the International Symposium on

Quantum Fluids and Solids (QFS2006)

Subj-class: Other

\\

We study the elementary excitations of Bose-Einstein condensates in a

one-dimensional periodic potential and discuss the stability of superfluid flow

based on the Kronig-Penney model. We analytically solve the Bogoliubov

equations and calculate the excitation spectrum. The Landau and dynamical

instabilities occur in the first condensate band when the superfluid velocity

exceeds certain critical values, which agrees with the result of condensates in

a sinusoidal potential. It is found that the onset of the Landau instability

coincides with the point where the perfect transmission of low-energy

excitations is forbidden, while the dynamical instability occurs when the

effective mass is negative. It is well known that the condensate band has a

peculiar structure called swallowtail when the periodic potential is shallow

compared to the mean field energy. We find that the upper side of the

swallowtail is dynamically unstable although the excitations have the linear

dispersion reflecting the positive effective mass.

\\ ( http://arXiv.org/abs/cond-mat/0607195 , 98kb)

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Paper: cond-mat/0607202

Date: Fri, 7 Jul 2006 16:45:58 GMT (45kb)

Title: Correlated Fermions on a Checkerboard Lattice

Authors: F. Pollmann, J. J. Betouras, K. Shtengel, P. Fulde

Comments: 4 Pages, 3 Figures

Subj-class: Strongly Correlated Electrons

\\

A model of strongly correlated spinless fermions hopping on a checkerboard

lattice is mapped onto a quantum fully-packed loop model. We identify the

number of fluctuationless states specific to the fermionic case. We also show

that for a class of fluctuating states, the fermionic sign problem can be

gauged away. This claim is supported by numerically evaluating the energies of

the low-lying states. Furthermore, we analyze in detail the excitations at the

Rokhsar-Kivelson point of this model thereby using the relation to the height

model and the single-mode approximation.

\\ ( http://arXiv.org/abs/cond-mat/0607202 , 35kb)

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Paper: quant-ph/0603229

replaced with revised version Fri, 7 Jul 2006 17:10:47 GMT (23kb)

Title: Spin Decoherence in Superconducting Atom Chips

Authors: Per Kristian Rekdal, Bo-Sture K. Skagerstam, Ulrich Hohenester, Asier

Eiguren

Comments: 4 pages, 2 figures. Physical Review Letters (in press)

Subj-class: Quantum Physics; Soft Condensed Matter

\\ ( http://arXiv.org/abs/quant-ph/0603229 , 23kb)

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Paper: quant-ph/0607048

Date: Thu, 6 Jul 2006 23:22:46 GMT (938kb)

Title: Nonlinear coherent dynamics of an atom in an optical lattice

Authors: V.Yu. Argonov and S.V. Prants

\\

We consider a simple model of lossless interaction between a two-level single

atom and a standing-wave single-mode laser field which creates a

one-dimensional optical lattice. Internal dynamics of the atom is governed by

the laser field which is treated to be classical with a large number of

photons. Center-of-mass classical atomic motion is governed by the optical

potential and the internal atomic degree of freedom. The resulting

Hamilton-Schr\"odinger equations of motion are a five-dimensional nonlinear

dynamical system with two integrals of motion. The main focus of the paper is

chaotic atomic motion that may be quantified strictly by positive values of the

maximal Lyapunov exponent. It is shown that atom, depending on the value of its

total energy, can either oscillate chaotically in a well of the optical

potential or fly ballistically with weak chaotic oscillations of its momentum

or wander in the optical lattice changing the direction of motion in a chaotic

way. In the regime of chaotic wandering atomic motion is shown to have fractal

properties. We find a useful tool to visualize complicated atomic motion --

Poincar\'e mapping of atomic trajectories in an effective three-dimensional

phase space onto planes of atomic internal variables and momentum. We find

common features with typical non-hyperbolic Hamiltonian systems -- chains of

resonant islands of different sizes embedded in a stochastic sea, stochastic

layers, bifurcations, and so on. The phenomenon of sticking of atomic

trajectories to boundaries of regular islands, that should have a great

influence to atomic transport in optical lattices, is found and demonstrated

numerically.

\\ ( http://arXiv.org/abs/quant-ph/0607048 , 938kb)

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Paper: physics/0607061

Date: Fri, 7 Jul 2006 02:33:34 GMT (218kb)

Title: Nonlinear magneto-optical rotation, Zeeman and hyperfine relaxation of

potassium atoms in a paraffin-coated cell

Authors: J. S. Guzman, A. Wojciechowski, J. E. Stalnaker, K. Tsigutkin, V. V.

Yashchuk, D. Budker

Comments: 8pages, 10 figures

Subj-class: Atomic Physics

\\

Nonlinear magneto-optical Faraday rotation (NMOR) on the potassium D1 and D2

lines was used to study Zeeman relaxation rates in an antirelaxation

paraffin-coated 3-cm diameter potassium vapor cell. Intrinsic Zeeman relaxation

rates of $\gamma^{NMOR}/2\pi=2.0(6) {\rm Hz}$ were observed. The relatively

small hyperfine intervals in potassium lead to significant differences in NMOR

in potassium compared to rubidium and cesium. Using laser optical pumping,

widths and frequency shifts were also determined for transitions between

ground-state hyperfine sublevels of $^{39}$K atoms contained in the same

paraffin-coated cell. The intrinsic hyperfine relaxation rate of

$\gamma^{hf}_{expt}/2\pi = 10.6(7) $Hz and a shift of $-9.1(2) $Hz were

observed. These results show that adiabatic relaxation gives only a small

contribution to the overall hyperfine relaxation in the case of potassium, and

the relaxation is dominated by other mechanisms similar to those observed in

previous studies with rubidium.

\\ ( http://arXiv.org/abs/physics/0607061 , 218kb)

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Paper: cond-mat/0607228

Date: Mon, 10 Jul 2006 03:26:37 GMT (628kb)

Title: Degenarate Fermi Gases of Ytterbium

Authors: Takeshi Fukuhara, Yosuke Takasu, Mitsutaka Kumakura, and Yoshiro

Takahashi

Comments: 4 pages, 3figures

Subj-class: Other

\\

An evaporative cooling was performed to cool the fermionic $^{173}$Yb atoms

in a crossed optical dipole trap. The elastic collision rate, which is

important for the evaporation, turns out to be large enough from our study.

This large collision rate leads to efficient evaporation and we have

successfully cooled the atoms below 0.6 of the Fermi temperature, that is to

say, to a quantum degenerate regime. In this regime, a plunge of evaporation

efficiency is observed as the result of the Fermi degeneracy.

\\ ( http://arXiv.org/abs/cond-mat/0607228 , 628kb)

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Paper: cond-mat/0607235

Date: Mon, 10 Jul 2006 13:23:10 GMT (67kb)

Title: Quench dynamics and non equilibrium phase diagram of the Bose-Hubbard

model

Authors: Corinna Kollath, Andreas Laeuchli, and Ehud Altman

Subj-class: Other

\\

We investigate the time evolution of correlations in the Bose-Hubbard model

following a quench from the superfluid to the Mott insulating phase. For large

values of the final interaction strength the system approaches a distinctly

non-equilibrium steady state that bares strong memory of the initial

conditions. In contrast, when the final interaction strength is comparable to

the hopping, the correlations are rather well approximated by those at thermal

equilibrium. The existence of two distinct non-equilibrium regimes is

surprising given the non-integrability of the Bose-Hubbard model. We relate

this phenomena to the role of quasi-particle interactions in the Mott

insulating state.

\\ ( http://arXiv.org/abs/cond-mat/0607235 , 67kb)

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Paper: cond-mat/0607236

Date: Mon, 10 Jul 2006 13:24:49 GMT (807kb)

Title: Stability and properties of striped phases in systems of interacting

fermions or hard-core bosons

Authors: Volodymyr Derzhko

Comments: PhD thesis, 100 pages, 37 figures, 33 tables

Subj-class: Strongly Correlated Electrons; Statistical Mechanics

\\

In this thesis we deal with the specific collective phenomena in condensed

matter - striped-structures formation. Such structures are observed in

different branches of condensed matter physics, like surface physics or physics

of high-temperature superconductors. These quasi-one-dimensional objects appear

in theoretical analyses as well as in computer simulations of different

theoretical models. Here, the main topic of interest is the stability of

striped structures in certain quantum models, where a tendency towards

crystallization competes with a tendency towards phase separation, and some

basic properties of these structures.

\\ ( http://arXiv.org/abs/cond-mat/0607236 , 807kb)

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Paper: cond-mat/0607246

Date: Mon, 10 Jul 2006 17:14:17 GMT (132kb)

Title: Metal-Insulator Transition Revisited for Cold Atoms in Non-Abelian Gauge

Potentials

Authors: Indubala I. Satija, Daniel C. Dakin and Charles W. Clark

Comments: 4 pages, 4 figures, see http://physics.gmu.edu/~isatija/recentpub.htm

for high resolution figures

Subj-class: Other

\\

We discuss the possibility of realizing metal-insulator transitions with

ultracold atoms in two-dimensional optical lattices in the presence of

artificial gauge potentials. Such transitions have been extensively studied for

magnetic fields corresponding to Abelian gauges; they occur when the magnetic

flux penetrating the lattice plaquette is an irrational multiple of the

magnetic flux quantum. Here we present the first study of these transitions for

non-Abelian U(2) gauge fields, which can be realized with atoms with two pairs

of degenerate internal states. In contrast to the Abelian case, the spectrum

and localization transition in the non-Abelian case is strongly influenced by

atomic momenta. In addition to determining the localization boundary, the

momentum fragments the spectrum and the minimum energy viewed as a function of

momentum exhibits a step structure. Other key characteristics of the

non-Abelian case include the absence of localization for certain states and

satellite fringes around the Bragg peaks in the momentum distribution and an

interesting possibility that the transition can be tuned by the atomic momenta.

\\ ( http://arXiv.org/abs/cond-mat/0607246 , 132kb)

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Paper: cond-mat/0607251

Date: Mon, 10 Jul 2006 19:43:33 GMT (49kb)

Title: Quantum Phase Transitions of Hard-Core Bosons in Background Potentials

Authors: Anand Priyadarshee, Shailesh Chandrasekharan, Ji-Woo Lee, and Harold

U. Baranger

Comments: 4 pages, 6 figures

Subj-class: Statistical Mechanics; Superconductivity

\\

We study the zero temperature phase diagram of hard core bosons in two

dimensions subjected to three types of background potentials: staggered,

uniform, and random. In all three cases there is a quantum phase transition

from a superfluid (at small potential) to a normal phase (at large potential),

but with different universality classes. As expected, the staggered case

belongs to the XY universality, while the uniform potential induces a mean

field transition. The disorder driven transition is clearly different from

both; in particular, we find z~1.4, \nu~1, and \beta~0.6.

\\ ( http://arXiv.org/abs/cond-mat/0607251 , 49kb)

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Paper: cond-mat/0602274

replaced with revised version Mon, 10 Jul 2006 18:55:07 GMT (26kb)

Title: Induced P-wave Superfluidity in Asymmetric Fermi Gases

Authors: Aurel Bulgac, Michael McNeil Forbes, Achim Schwenk

Comments: published version

Subj-class: Other; Superconductivity

Journal-ref: Phys. Rev. Lett. 97, 020402 (2006)

DOI: 10.1103/PhysRevLett.97.020402

\\ ( http://arXiv.org/abs/cond-mat/0602274 , 26kb)

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Paper: quant-ph/0607064

Date: Mon, 10 Jul 2006 18:46:31 GMT (991kb)

Title: Manipulation of matter waves using Bloch and Bloch-Zener oscillations

Authors: B. M. Breid, D. Witthaut and H. J. Korsch

\\

We present theoretical and numerical results on the dynamics of ultracold

atoms in an accelerated single- and double-periodic optical lattice. In the

single-periodic potential Bloch oscillations can be used to generate fast

directed transport with very little dispersion. The dynamics in the

double-periodic system is dominated by Bloch-Zener oscillations, i.e. the

interplay of Bloch oscillations and Zener tunneling between the subbands. Apart

from directed transport, the latter system permits various interesting

applications, such as widely tunable matter wave beam splitters and

Mach-Zehnder interferometry. As an application, a method for efficient probing

of small nonlinear mean-field interactions is suggested.

\\ ( http://arXiv.org/abs/quant-ph/0607064 , 991kb)

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Paper: physics/0607075

Date: Sun, 9 Jul 2006 21:11:42 GMT (132kb)

Title: Rogue decoherence in the formation of a macroscopic atom-molecule

superposition

Authors: Olavi Dannenberg and Matt Mackie

Comments: 10 pages, 4 figures, 46+ references; submitted to PRA

Subj-class: Atomic Physics; Chemical Physics

\\

We theoretically examine two-color photoassociation of a Bose-Einstein

condensate, focusing on the role of rogue decoherence in the formation of

macroscopic atom-molecule superpositions. Rogue dissociation occurs when two

zero-momentum condensate atoms are photoassociated into a molecule, which then

dissociates into a pair of atoms of equal-and-opposite momentum, instead of

dissociating back to the zero-momentum condensate. As a source of decoherence

that may damp quantum correlations in the condensates, rogue dissociation is an

obstacle to the formation of a macroscopic atom-molecule superposition. We

study rogue decoherence in a setup which, without decoherence, yields a

macroscopic atom-molecule superposition, and find that the most favorable

conditions for said superposition are a density ~ 1e12 atoms per cc and

temperature ~ 1e-10.

\\ ( http://arXiv.org/abs/physics/0607075 , 132kb)

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Paper: physics/0607084

Date: Mon, 10 Jul 2006 18:13:21 GMT (36kb)

Title: Ultracold Rb-OH collisions and prospects for sympathetic cooling

Authors: M. Lara, J. L. Bohn, D. Potter, P. Soldan, and J. Hutson

Comments: submitted to PRL

Subj-class: Atomic Physics

\\

We have computed ab inito cross sections for cold collisions of Rb atoms with

OH radicals. We predict collision rate constants of order 10^{-11} cm^3/s at

temperatures in the range 10-100 mK at which molecules have already been

produced experimentally. However, we also find that in these collisions the

molecules have a strong propensity for changing their internal state, which

could make sympathetic cooling of OH in a Rb buffer gas problematic in

magnetostatic or electrostatic traps.

\\ ( http://arXiv.org/abs/physics/0607084 , 36kb)

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Paper: cond-mat/0607253

Date: Mon, 10 Jul 2006 20:08:02 GMT (45kb)

Title: Classifying Novel Phases of Spinor Atoms

Authors: Ryan Barnett, Ari Turner, Eugene Demler

Subj-class: Strongly Correlated Electrons

\\

We consider many-body states of bosonic spinor atoms which, at the mean-field

level, can be characterized by a single-particle wave function. Such states

include BEC phases and insulating Mott states with one atom per site. We

describe and apply a classification scheme that makes explicit spin symmetries

of such states and enables one to naturally analyze their collective modes and

topological excitations. Quite generally, the method allows classification of a

spin F system as a polyhedron with 2F vertices. After discussing the general

formalism we apply it to the many-body states of bosons with hyperfine spins

two and three. For spin-two atoms we find the ferromagnetic state, a continuum

of nematic states, and a state having the symmetry of the point group of the

regular tetrahedron. For spin-three atoms we obtain similar ferromagnetic and

nematic phases as well as states having symmetries of various types of

polyhedra with six vertices: the hexagon, the pyramid with pentagonal base, the

prism, and the octahedron.

\\ ( http://arXiv.org/abs/cond-mat/0607253 , 45kb)

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Paper: cond-mat/0607274

Date: Tue, 11 Jul 2006 14:18:04 GMT (283kb)

Title: Persistent current of atoms in a ring optical lattice

Authors: Andrey R. Kolovsky

Comments: 17 pages, IOP-style

Subj-class: Soft Condensed Matter; Mesoscopic Systems and Quantum Hall Effect

\\

We consider a small ensemble of Bose atoms in a ring optical lattice with

weak disorder. The atoms are assumed to be initially prepared in a superfluid

state with non-zero quasimomentum and, hence, may carry matter current. It is

found that the atomic current persists in time for a low value of the

quasimomentum but decays exponentially for a high (around one quater of the

Brillouin zone) quasimomentum. The explanation is given in terms of low- and

high-energy spectra of the Bose-Hubbard model, which we describe using the

Bogoliubov and random matrix theories, respectively.

\\ ( http://arXiv.org/abs/cond-mat/0607274 , 283kb)

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Paper (*cross-listing*): nlin.PS/0607009

Date: Fri, 7 Jul 2006 21:39:20 GMT (456kb)

Title: Modulated Amplitude Waves in Collisionally Inhomogeneous Bose-Einstein

Condensates

Authors: Mason A. Porter, P. G. Kevrekidis, Boris A. Malomed, and D. J.

Frantzeskakis

Comments: 24 pages, 10 figures (many with several parts), submitted to Physica

D; higher resolution versions of some figures are available at

http://www.its.caltech.edu/~mason/papers

Subj-class: Pattern Formation and Solitons; Other; Atomic Physics; Dynamical

Systems

\\

We investigate the dynamics of an effectively one-dimensional Bose-Einstein

condensate (BEC) with the scattering length $a$ subjected to a spatially

periodic modulation, $a=a(x) = a(x + L)$. This "collisionally inhomogeneous"

BEC is described by a Gross-Pitaevskii (GP) equation with a nonlinearity

coefficient that is a periodic function of $x$. We transform this GP equation

into a constant-nonlinearity GP equation with an effective potential and study

a class of the latter's extended wave solutions. For small inhomogeneities, the

effective potential takes a form reminiscent of a superlattice, and the

amplitude dynamics of the BEC's coherent structures are described by a

nonlinear generalized Ince equation. In the small-amplitude limit, we use

averaging to construct modulated amplitude wave (MAW) solutions, whose

stability we subsequently examine using both numerical simulations of the

original GP equation and fixed point computations with the MAWs as numerically

exact solutions. We show that "on-site" solutions, whose maxima correspond to

maxima of the "nonlinear lattice" $a(x)$, are significantly more stable than

"off-site" solutions.

\\ ( http://arXiv.org/abs/nlin/0607009 , 456kb)

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Paper: cond-mat/0508645

replaced with revised version Tue, 11 Jul 2006 15:32:34 GMT (33kb)

Title: Potential-energy (BCS) to kinetic-energy (BEC)-driven pairing in the

attractive Hubbard model

Authors: B. Kyung, A. Georges, and A. -M. S. Tremblay

Comments: 5 pages, 4 figures

Subj-class: Strongly Correlated Electrons; Superconductivity

Journal-ref: Phys. Rev. B 74, 024501 (2006)

\\ ( http://arXiv.org/abs/cond-mat/0508645 , 33kb)

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Paper: cond-mat/0511647

replaced with revised version Tue, 11 Jul 2006 08:13:14 GMT (21kb)

Title: Thermodynamic properties of a trapped Bose gas : A diffusion Monte Carlo

study

Authors: S Datta

Comments: 19 pages, 12 figures

Subj-class: Statistical Mechanics

\\ ( http://arXiv.org/abs/cond-mat/0511647 , 21kb)

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Paper: cond-mat/0604580

replaced with revised version Tue, 11 Jul 2006 16:04:49 GMT (16kb)

Title: Superfluidity in a Three-flavor Fermi Gas with SU(3) Symmetry

Authors: Lianyi He, Meng Jin and Pengfei Zhuang

Comments: 9 pages, 2 figures, title slightly changed

Subj-class: Other; Superconductivity; Atomic Physics

\\ ( http://arXiv.org/abs/cond-mat/0604580 , 16kb)

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Paper: cond-mat/0607294

Date: Tue, 11 Jul 2006 20:17:57 GMT (513kb)

Title: Strongly correlated 2D quantum phases with cold polar molecules:

controlling the shape of the interaction potential

Authors: H.P. B\"uchler, E. Demler, M. Lukin, A. Micheli, N. Prokof'ev, G.

Pupillo, and P. Zoller

Comments: 4 pages, 3 figures

Subj-class: Statistical Mechanics

\\

We discuss techniques to tune and shape the long-range part of the

interaction potentials in quantum gases of polar molecules by dressing

rotational excitations with static and microwave fields. This provides a novel

tool towards engineering strongly correlated quantum phases in combination with

low dimensional trapping geometries. As an illustration, we discuss a 2D

crystalline phase, and a superfluid-crystal quantum phase transition.

\\ ( http://arXiv.org/abs/cond-mat/0607294 , 513kb)

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Paper: cond-mat/0607297

Date: Tue, 11 Jul 2006 23:57:26 GMT (138kb)

Title: Melting of Discrete Vortices via Quantum Fluctuations

Authors: Chaohong Lee, Tristram J. Alexander, and Yuri S. Kivshar

Comments: 4 pages, 5 figures

Subj-class: Other

\\

We consider nonlinear boson states with a nontrivial phase structure in the

three-site Bose-Hubbard ring, {\em quantum discrete vortices} (or {\em

q-vortices}), and study their "melting" under the action of quantum

fluctuations. We calculate the spatial correlations in the ground states to

show the superfluid-insulator crossover and analyze the fidelity between the

exact and variational ground states to explore the validity of the classical

analysis. We examine the phase coherence and the effect of quantum fluctuations

on q-vortices and reveal that the breakdown of these coherent structures

through quantum fluctuations accompanies the superfluid-insulator crossover.

\\ ( http://arXiv.org/abs/cond-mat/0607297 , 138kb)

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Paper: cond-mat/0607298

Date: Wed, 12 Jul 2006 01:36:27 GMT (690kb)

Title: Superfluid Expansion of a Strongly Interacting Fermi Gas

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

Comments: 5 pages, 5 figures

Subj-class: Superconductivity; Strongly Correlated Electrons

\\

We study the expansion of a rotating, superfluid Fermi gas. The presence and

absence of vortices in the rotating gas is used to distinguish superfluid and

normal parts of the expanding cloud. We find that the superfluid pairs survive

during the expansion until the density decreases below a critical value. Our

observation of superfluid flow at this point extends the range where fermionic

superfluidity has been studied to densities of 1.2 10^{11} cm^{-3}, about an

order of magnitude lower than any previous study.

\\ ( http://arXiv.org/abs/cond-mat/0607298 , 690kb)

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Paper: cond-mat/0607123

replaced with revised version Wed, 12 Jul 2006 16:05:39 GMT (565kb)

Title: Adiabatic Phase Diagram on Degenerate Fermi Gas with Feshbach-Resonance

Authors: S. Watabe, T. Nikuni, N. Nygaard, J. E. Williams, C. W. Clark

Comments: 6 pages, 7 figures, submitted to Quantum Fluids and Solids Conference

(QFS 2006)

Subj-class: Other

\\ ( http://arXiv.org/abs/cond-mat/0607123 , 565kb)

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Paper: physics/0607120

Date: Wed, 12 Jul 2006 17:09:32 GMT (293kb)

Title: Suppression of reflection from the grid boundary in solving the

time-dependent Schroedinger equation by split-step technique with fast

Fourier transform

Authors: A. A. Gonoskov and I. A. Gonoskov

Comments: 4 pages, 3 figures

Subj-class: Atomic Physics; Optics

\\

We present an approach to numerically solving the time-dependent Schroedinger

equation and other parabolic equations by the split-step technique with fast

Fourier transform, which suppresses the backreflection of waves from the grid

boundaries with any specified accuracy. Most importantly, all known methods

work well only for a narrow region of incident waves spectrum, and the proposed

method provides absorption of any wave whose length is large enough in

comparison with the size of absorption region.

\\ ( http://arXiv.org/abs/physics/0607120 , 293kb)

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Paper: cond-mat/0607277

Date: Tue, 11 Jul 2006 15:02:52 GMT (118kb)

Title: Rabi Lattices

Authors: Y. D. Chong, David E. Pritchard and Marin Soljacic

Comments: 4 pages, 3 figures

Subj-class: Other; Optics

\\

We present a microscopic model of two-level atoms localized in a lattice,

based on the Hopfield theory of exciton polaritons. In addition to a

polaritonic gap at the exciton energy, a photonic band gap opens up at the

Brillouin zone boundary. Upon tuning the lattice period to match the photonic

gap with the exciton energy, we obtain a combined polaritonic and photonic gap

as a generalization of the Rabi splitting phenomenon. For typical experimental

parameters, the size of the combined gap is on the order of 25 cm^-1, up to

10^5 times the detuned gap size.

\\ ( http://arXiv.org/abs/cond-mat/0607277 , 118kb)

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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/ ========================================================================= 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 Jul 13 2006 - 18:00:56 EST

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