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

Date: Mon, 15 Jun 2009 14:33:33 +1000

Date: Mon, 15 Jun 2009 14:33:33 +1000

Dear subscribers,

Simon Haine is responsible for the compilation of this week's abstracts. There

are 21 new preprints and 10 replacements:

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arXiv:0905.1125

Date: Thu, 7 May 2009 20:01:00 GMT (1326kb)

Title: Supersolidity of Cold Atomic Bose-Fermi mixtures in optical lattices

Authors: Peter P. Orth, Doron L. Bergman, and Karyn Le Hur

Categories: cond-mat.quant-gas

\\

We investigate a cold atomic mixture of spinless bosons and fermions in

two-dimensional optical lattices. In the presence of a nested Fermi surface,

the bosons may develop a fascinating supersolid behavior characterized by a

finite superfluid density as well as a spatial density wave order. Focusing on

the triangular lattice geometry and combining a general Landau-Ginzburg-Wilson

approach with microscopically derived mean-field theory, we find an exotic

supersolid phase at a fermionic band-filling of $n_f = 3/4$ with a Kagome-type

crystalline order. We also address the case of anisotropic hopping amplitudes,

and show that striped supersolid phases emerge on the square and triangular

lattices. For weak interactions, the supersolid competes with phase separation.

For strong intra- and inter-species interactions, with the total number of

fermions and bosons corresponding to one particle per site, the bosons form an

alternating Mott insulator ground state. Finally, for a mixture of

$^{87}\text{Rb}^{40}\text{K}$ and $^{23}\text{Na}^6\text{Li}$, we show that

supersolidity can be observed in the range of accessible temperatures in the

square lattice geometry.

\\ ( http://arxiv.org/abs/0905.1125 , 1326kb)

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arXiv:0905.1146

Date: Fri, 8 May 2009 00:00:43 GMT (95kb)

Title: $F$-wave pairing of cold atoms in optical lattices

Authors: Wei-Cheng Lee, Congjun Wu, S. Das Sarma

Categories: cond-mat.quant-gas cond-mat.supr-con

Comments: 7 pages, 5 figures

\\

The tremendous development of cold atom physics has opened up a whole new

opportunity to study novel states of matter which are not easily accessible in

solid state systems. Here we propose to realize the $f$-wave pairing

superfluidity of spinless fermions in the $p_{x,y}$-orbital bands of the two

dimensional honeycomb optical lattices. The non-trivial orbital band structure

rather than strong correlation effects gives rise to the unconventional pairing

with the nodal lines of the $f$-wave symmetry. With a confining harmonic trap,

zero energy Andreev bound states appear around the circular boundary with a

six-fold symmetry. The experimental realization and detection of this novel

pairing state are feasible.

\\ ( http://arxiv.org/abs/0905.1146 , 95kb)

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arXiv:0905.1147

Date: Fri, 8 May 2009 00:00:42 GMT (1646kb)

Title: Tunneling of strongly repulsive hard-sphere bosons in an optical lattice

with tight external harmonic confinement: A quantum Monte Carlo investigation

in continuous space

Authors: Asaad R. Sakhel, Jonathan L. Dubois, and Roger R. Sakhel

Categories: cond-mat.quant-gas cond-mat.other

\\

The effect of strongly repulsive interactions on the tunneling amplitude of

hard-sphere (HS) bosons confined in a simple cubic (sc) optical lattice plus

tight external harmonic confinement in continuous space is investigated. The

quantum variational Monte Carlo (VMC) and the variational path integral Monte

Carlo (VPI) techniques are used at zero temperature. The effects of the lattice

spacing $\pi/k$ and the occupancy of the lattice sites are also explored as a

function of the repulsion between the bosons. Our chief result is, that the

width of the wave function in each well does not broaden with a rise in the

repulsive interactions. We believe that the presence of a negative effective

bosonic mass generates a "fake" attractive force which overwhelms the

repulsion. This causes the bosons to behave as if there is an attractive force

between them pulling them together. It is found that the tunneling amplitude

decreases with a rise in the hard-sphere repulsion, and that the tunneling of

the bosons is directed away from the center of the trap towards the edges of

the trap. Further, it is found that the energy per particle at certain optical

depths is insensitive to the number of particles and variations in the HS

diameter of the bosons. In addition, the tunneling amplitude rises with a

reduction in the lattice spacing. In order to check the accuracy of our VMC

results, we compare them with corresponding VPI results.

\\ ( http://arxiv.org/abs/0905.1147 , 1646kb)

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arXiv:0905.1281

Date: Fri, 8 May 2009 15:08:45 GMT (310kb)

Title: Strongly Interacting Two-Dimensional Dirac Fermions in a Cold Atomic

System

Authors: Lih-King Lim, Achilleas Lazarides, Andreas Hemmerich, and C. Morais

Smith

Categories: cond-mat.quant-gas cond-mat.supr-con

\\

Strongly correlated low-dimensional electron systems exhibit a wealth of

interesting phenomena, ranging from high-temperature superconductivity in the

cuprates, to unconventional superconductivity in the heavy-fermion compounds

and the fractional quantum Hall effect in two-dimensional semiconducting

heterostructures. The recent breakthrough in fabricating sheets of graphene,

where the quasiparticles are two-dimensional Dirac fermions, has brought

renewed interest to the field. Graphene, however, turns out to be a weakly

interacting system. Here we propose a realization of strongly interacting

two-dimensional Dirac fermions with ultracold atoms in an optical lattice. The

tunable on-site and nearest-neighbor interactions allow for the stabilization

of an s-wave and an unconventional superconducting phases. In field theory, the

interplay between non-trivial topology and Dirac fermions is a prerequisite to

the occurrence of exotic phenomena. We show that a vortex in the unconventional

superconducting phase gives rise to number fractionalization of fermions.

\\ ( http://arxiv.org/abs/0905.1281 , 310kb)

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arXiv:0905.0849 (*cross-listing*)

Date: Wed, 6 May 2009 15:04:31 GMT (214kb)

Title: Bose Condensation and the BTZ Black Hole

Authors: Cenalo Vaz and L.C.R. Wijewardhana

Categories: hep-th cond-mat.stat-mech gr-qc

Comments: 5 pages, 3 figures

\\

Although all popular models of quantum gravity are able to recover the

Bekenstein-Hawking entropy-area law in the thermodynamic limit, there are

significant differences in the microstates and in the application of

statistics. The use of different statistics would lead to divergent predictions

away from the thermodynamic limit or at very low temperatures. In this letter

we examine the Ba\~nados-Teitelboim-Zanelli (BTZ) black hole. It admits an

equispaced mass spectrum according to both the canonical and the AdS/CFT

approaches and the area law is recovered at high temperatures via Bose

statistics. In the picture that arises from canonical quantum gravity, the BTZ

black hole behaves essentially as a system of Bosonic mass shells moving in a

one dimensional harmonic trap. Condensation does not occur in the thermodynamic

limit. However, this system possesses a finite critical temperature, $T_c$, and

exhibits a large condensate fraction below $T_c$ when the number of shells is

finite.

\\ ( http://arxiv.org/abs/0905.0849 , 214kb)

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arXiv:0904.4342

Date: Tue, 28 Apr 2009 09:18:07 GMT (524kb)

Title: Wide cylindrical or spherical optical potentials from laser beam

superpositions

Authors: Ole Steuernagel

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

Comments: 15 pages, 13 figures

\\

Superpositions of paraxial Laguerre-Gauss laser beam modes to generate

optical potentials based on the optical dipole force are investigated

theoretically. Parabolic and other monomial potentials with even powers, in

cylindrical and spherical symmetry, with large diameters, can be synthesized.

This superposition approach promises to help with high quality atom cloud

manipulation and imaging.

\\ ( http://arxiv.org/abs/0904.4342 , 524kb)

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arXiv:0905.1197

Date: Fri, 8 May 2009 08:09:25 GMT (28kb)

Title: Measurement schemes for the spin quadratures on an ensemble of atoms

Authors: Ryo Namiki, Tetsushi Takano, Shin-Ichi-Ro Tanaka, Yoshiro Takahashi

Categories: quant-ph

Comments: 4pages 2 figures

\\

We consider how to measure collective spin states of an atomic ensemble based

on the recent multi-pass approaches for quantum interface between light and

atoms. We find that a scheme with two passages of a light pulse through the

atomic ensemble is efficient to implement the homodyne tomography of the spin

state. Thereby, we propose to utilize optical pulses as a phase-shifter that

rotates the quadrature of the spins. This method substantially simplifies the

geometry of experimental schemes.

\\ ( http://arxiv.org/abs/0905.1197 , 28kb)

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arXiv:0905.1515

Date: Sun, 10 May 2009 23:47:17 GMT (2570kb,D)

Title: Exact solutions and stability of rotating dipolar Bose-Einstein

condensates in the Thomas-Fermi limit

Authors: R. M. W. van Bijnen, A. J. Dow, D. H. J. O'Dell, N. G. Parker and A.

M. Martin

Categories: cond-mat.quant-gas

Comments: 12 pages with 6 figures

\\

We present a theoretical analysis of dilute gas Bose-Einstein condensates

with dipolar atomic interactions under rotation in elliptical traps. Working in

the Thomas-Fermi limit, we employ the classical hydrodynamic equations to first

derive the rotating condensate solutions and then consider their response to

perturbations. We thereby map out the regimes of stability and instability for

rotating dipolar Bose-Einstein condensates and in the latter case, discuss the

possibility of vortex lattice formation. We employ our results to propose

several novel routes to induce vortex lattice formation in a dipolar

condensate.

\\ ( http://arxiv.org/abs/0905.1515 , 2570kb)

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arXiv:0905.1535

Date: Mon, 11 May 2009 03:23:43 GMT (49kb)

Title: Bose-Einstein condensation in quasi-2D systems: applications to high Tc

superconductivity

Authors: C. Villarreal and M. de Llano

Categories: cond-mat.supr-con cond-mat.quant-gas

Comments: 5 pages, 1 figure

\\

We describe high-Tc superconductivity in layered materials within a BCS

theory as a BEC of massless-like Cooper pairons satisfying a linear dispersion

relation, and propagating within quasi-2D layers of finite width defined by the

charge distribution about the CuO_2 planes. We obtain a closed formula for the

critical temperature, Tc, that depends on the layer width, the binding energy

of Cooper's pairs, and the average in-plane penetration depth. This formula

reasonably reproduces empirical values of superconducting transition

temperatures for several different cuprate materials near the optimal doping

regime, as well as for YBCO films with different doping degrees.

\\ ( http://arxiv.org/abs/0905.1535 , 49kb)

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Title: Calculation of Drag and Superfluid Velocity from the Microscopic

Parameters and Excitation Energies of a Two-Component Bose-Einstein

Condensate on an Optical Lattice

Authors: Jacob Linder and Asle Sudb{\o}

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

Comments: 11 pages, 5 figures. Accepted for publication in Phys. Rev. A

\\

We investigate a model of a two-component Bose-Einstein condensate residing

on an optical lattice. Within a Bogolioubov-approach at the mean-field level,

we derive exact analytical expressions for the excitation spectrum of the

two-component condensate when taking into account hopping and interactions

between arbitrary sites. Our results thus constitute a basis for works that

seek to clarify the effects of higher-order interactions in the system. We

investigate the excitation spectrum and the two branches of superfluid velocity

in more detail for two limiting cases of particular relevance. Moreover, we

relate the hopping and interaction parameters in the effective Bose-Hubbard

model to microscopic parameters in the system, such as the laserlight

wavelength and atomic masses of the components in the condensate. These results

are then used to calculate analytically and numerically the drag coefficient

between the components of the condensate. We find that the drag is most

effective close to the symmetric case of equal masses between the components,

regardless of the strength of the intercomponent interaction and the lattice

well depth.

\\ ( http://arxiv.org/abs/0905.1330 , 295kb)

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arXiv:0905.1497

Date: Sun, 10 May 2009 19:21:28 GMT (604kb)

Title: Does black-hole evaporation imply that physics is non-unitary, and if

so, what must the laws of physics look like? An Essay

Authors: Steffen Gielen

Categories: quant-ph

Comments: 31 pages, 6 figures; revised and extended version of an essay

originally submitted as part of the requirements for a Certificate of

Advanced Study in Mathematics at Cambridge in 2007. Version accepted for

publication as a review article in International Journal of Quantum

Information (IJQI)

\\

Stephen Hawking's discovery of black hole evaporation had the remarkable

consequence that information is destroyed by a black hole, which can only be

accommodated by modifying the laws of quantum mechanics. Different attempts to

evade the information loss paradox were subsequently suggested, apparently

without a satisfactory resolution of the paradox. On the other hand, the

attempting to include non-unitarity into quantum mechanics might lead to laws

predicting observable consequences such as nonlocality or violation of

energy-momentum conservation; but it may be possibly to circumvent these

obstacles. Recent developments seem to require a different view on quantum

gravity and suggest that ideas about locality in physics and Hawking's

semi-classical approximation are misleading. An accurate description may show

unitary evolution and no information loss after all.

\\ ( http://arxiv.org/abs/0905.1497 , 604kb)

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Title: Analytic description of atomic interaction at ultracold temperatures:

the case of a single channel

Authors: Bo Gao

Categories: physics.atom-ph physics.chem-ph

Comments: 12 pages, 4 figures

\\

We present analytic descriptions of atomic interaction at ultracold

temperatures using both single-channel and multichannel quantum-defect

theories. In the case of a single channel, addressed in this paper, the

expansion of [B. Gao, Phys. Rev. A \textbf{58}, 4222 (1998)] is generalized to

higher orders for angular momentum $l\ge 2$ to give a more complete description

of ultracold scattering, including an analytic description of ultracold shape

resonances of arbitrary $l$. We also introduce a generalized scattering length

that is well defined and useful for all partial waves, to replace the

traditional definition that fails for $l\ge 2$ due to the long-range van der

Waals interaction. The results are used in a companion paper to derive analytic

descriptions of atomic interaction around a magnetic Feshbach resonance of

arbitrary angular momentum $l$.

\\ ( http://arxiv.org/abs/0905.1492 , 208kb)

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arXiv:0905.1708

Date: Mon, 11 May 2009 20:32:18 GMT (108kb)

Title: Mesoscopic quantum switching of a Bose-Einstein condensate in an optical

lattice governed by the parity of the number of atoms

Authors: V. S. Shchesnovich

Categories: cond-mat.quant-gas

Comments: 4 pages, 3 figures in color

\\

It is shown that for a N-boson system the parity of N can be responsible for

a qualitative difference in the system dynamics. The nonlinear boson model is

considered, which describes tunneling of boson pairs between two distinct modes

X_{1,2} of the same energy and applies to a Bose-Einstein condensate in an

optical lattice. In a time-dependent lattice, the qualitative result of the

quantum switching depends on parity of N, i.e. X_1 -> X_2 for even N and X_1 ->

X_1 for odd N, for arbitrary large N. A simple scheme is proposed to observe

the parity effect by using the non-adiabatic bounce switching regime, which is

insensitive to the initial state preparation (as long as it is localized at one

of the X_l modes) and requires an experimentally accessible coherence time. As

distinct from the previous considerations, the dynamic parity effect can be

observed on the mesoscopic scale.

\\ ( http://arxiv.org/abs/0905.1708 , 108kb)

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arXiv:0905.1836

Date: Tue, 12 May 2009 12:54:16 GMT (398kb)

Title: Short-range correlations and entropy in ultracold atomic Fermi gases

Authors: Zhenhua Yu, Georg M. Bruun, and Gordon Baym

Categories: cond-mat.quant-gas cond-mat.other

Comments: 6 pages, 3 figures

\\

We relate short-range correlations in ultracold atomic Fermi gases to the

entropy of the system over the entire temperature, $T$, vs. coupling strength,

$-1/k_Fa$, plane. In the low temperature limit the entropy is dominated by

phonon excitations and the correlations increase as $T^4$. In the BEC limit, we

calculate a boson model within the Bogoliubov approximation to show explicitly

how phonons enhance the fermion correlations. In the high temperature limit, we

show from the virial expansion that the correlations decrease as $1/T$. The

correlations therefore reach a maximum at a finite temperature. We infer the

general structure of the isentropes of the Fermi gas in the $T,-1/k_Fa$ plane,

and the temperature dependence of the correlations in the unitary, BEC, and BCS

limits. Our results compare well with measurements of the correlations via

photoassociation experiments at higher temperatures.

\\ ( http://arxiv.org/abs/0905.1836 , 398kb)

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arXiv:0905.2080

Date: Wed, 13 May 2009 11:57:50 GMT (352kb)

Title: Atomic Josephson junction with two bosonic species

Authors: Giovanni Mazzarella, Marco Moratti, Luca Salasnich, Mario Salerno,

Flavio Toigo

Categories: cond-mat.quant-gas

Comments: Accepted for the publication in J. Phys. B: At. Mol. Opt. Phys

\\

We study an atomic Josephson junction (AJJ) in presence of two interacting

Bose-Einstein condensates (BECs) confined in a double well trap. We assume that

bosons of different species interact with each other. The macroscopic wave

functions of the two components obey to a system of two 3D coupled

Gross-Pitaevskii equations (GPE). We write the Lagrangian of the system, and

from this we derive a system of coupled ordinary differential equations (ODE),

for which the coupled pendula represent the mechanic analogous. These

differential equations control the dynamical behavior of the fractional

imbalance and of the relative phase of each bosonic component. We perform the

stability analysis around the points which preserve the symmetry and get an

analytical formula for the oscillation frequency around the stable points. Such

a formula could be used as an indirect measure of the inter-species s-wave

scattering length. We also study the oscillations of each fractional imbalance

around zero and non zero - the macroscopic quantum self-trapping (MQST) - time

averaged values. For different values of the inter-species interaction

amplitude, we carry out this study both by directly solving the two GPE and by

solving the corresponding coupled pendula equations. We show that, under

certain conditions, the predictions of these two approaches are in good

agreement. Moreover, we calculate the crossover value of the inter-species

interaction amplitude which signs the onset of MQST.

\\ ( http://arxiv.org/abs/0905.2080 , 352kb)

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arXiv:0905.2100

Date: Wed, 13 May 2009 12:40:19 GMT (9kb)

Title: Exciting the Scissors Mode in crystals with strong spin-orbit coupling

as in Bose-Einstein Condensates

Authors: Keisuke Hatada, Kuniko Hayakawa, Fabrizio Palumbo

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

Comments: 5 pages, no figure

\\

In a recent study of the magnetic properties of rare-earth systems the two

extreme situations have been considered in which the crystalline electrostatic

field is large or small with respect to the spin-orbit interaction. In the

first case the orbitals of localized electrons are firmly coupled to the

lattice so that while an applied magnetic field rotates the spin, the charge

profile remains fixed to the lattice. In the second case an applied magnetic

field rotates both spin and density profile, even though through a very small

angle. We show that in this second case we have, in addition to the use of

photons or electrons, the possibility of exciting and observing the Scissors

Mode in crystals in a way analogous to that used in Bose-Einstein Condensates.

\\ ( http://arxiv.org/abs/0905.2100 , 9kb)

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arXiv:0905.2107

Date: Wed, 13 May 2009 13:31:36 GMT (8kb)

Title: Induced interactions and superfluidity in ultracold Fermi gases

Authors: H. Heiselberg

Categories: cond-mat.supr-con cond-mat.quant-gas

Comments: 3 pages

\\

Superfluidity and the physics behind high temperature superconductivity can

be studied in the highly controlled environment of ultracold Fermi atoms in

traps and optical lattices. Gorkov & Melik-Bharkudarov \cite{Gorkov} found that

many-body effects suppress BCS pairing by a factor $(4e)^{1/3}\simeq2.22$ in

three dimensions (3D). Here we calculate the corresponding suppression factor

$e\simeq2.72$ in two dimensions (2D). However, d-wave pairing is not suppressed

in 2D dilute Fermi gases. The s- and d-wave pairing gaps and critical

temperatures are also calculated for optical lattices at low (dilute) filling

as well as near half filling to leading orders in the interaction strength

including induced interactions. In 2D the induced interactions are singular at

half filling and strongly suppress s- and d-wave superfluidity.

\\ ( http://arxiv.org/abs/0905.2107 , 8kb)

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arXiv:0905.2165

Date: Wed, 13 May 2009 18:53:29 GMT (29kb)

Title: Ground-state fidelity in the BCS-BEC crossover

Authors: A. Khan, P. Pieri

Categories: cond-mat.stat-mech

Comments: 8 pages, 4 figures

\\

The ground-state fidelity has been introduced recently as a tool to

investigate quantum phase transitions. Here, we apply this concept in the

context of a crossover problem. Specifically, we calculate the fidelity

susceptibility for the BCS ground-state wave function, when the intensity of

the fermionic attraction is varied from weak to strong in an interacting Fermi

system, through the BCS-BEC crossover. Results are presented for contact and

finite-range attractive potentials and for both continuum and lattice models.

We conclude that the fidelity susceptibility can be useful also in the context

of crossover problems.

\\ ( http://arxiv.org/abs/0905.2165 , 29kb)

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arXiv:0905.2072

Date: Wed, 13 May 2009 11:42:49 GMT (17kb)

Title: Radio Frequency Response of the Strongly Interacting Fermi Gases at

Finite Temperatures

Authors: S. Y. Chang

Categories: physics.atom-ph cond-mat.quant-gas

Comments: 2 figures

\\

The radio frequency spectrum of the fermions in the unitary limit at finite

temperatures is characterized by the sum rule relations. We consider a simple

picture where the atoms are removed by radio frequency excitations from the

strongly interacting states into a state of negligible interaction. We

calculate the moments of the response function in the range of temperature

$0.08 \epsilon_F < T < 0.8 \epsilon_F$ using an auxiliary field Monte Carlo

technique (AFMC) in which continuum auxiliary fields with a density dependent

shift are used. We estimate the effects of superfluid pairing from the clock

shift. We find a qualitative agreement with the pairing gap - pseudogap

transition behavior. We also find within the quasiparticle picture that in

order for the gap to come into quantitative agreement with the previously known

value at T=0, the effective mass has to be $m^* \sim 1.43 m$.

\\ ( http://arxiv.org/abs/0905.2072 , 17kb)

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arXiv:0905.2241

Date: Thu, 14 May 2009 03:30:27 GMT (1426kb)

Title: Soliton localization in Bose-Einstein condensates with time-dependent

harmonic potential and scattering length

Authors: U. Al Khawaja

Categories: cond-mat.quant-gas cond-mat.other

Comments: 19 pages, 11 figures, accepted for publication in J.Phys.A

\\

We derive exact solitonic solutions of a class of Gross-Pitaevskii equations

with time-dependent harmonic trapping potential and interatomic interaction. We

find families of exact single-solitonic, multi-solitonic, and solitary wave

solutions. We show that, with the special case of an oscillating trapping

potential and interatomic interaction, a soliton can be localized indefinitely

at an arbitrary position. The localization is shown to be experimentally

possible for sufficiently long time even with only an oscillating trapping

potential and a constant interatomic interaction.

\\ ( http://arxiv.org/abs/0905.2241 , 1426kb)

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arXiv:0905.2402

Date: Thu, 14 May 2009 19:13:28 GMT (314kb)

Title: Zeeman slowing of thulium atoms

Authors: K. Chebakov, A. Sokolov, A. Akimov, D. Sukachev, S. Kanorsky, N.

Kolachevsky, V. Sorokin

Categories: physics.optics

Comments: 3 pages, 4 figures

\\

We demonstrate laser slowing of a hot thulium atomic beam using the nearly

closed cycling transition

$4\textrm{f}^{13}6\textrm{s}^2(^2\textrm{F}^\circ)(J=7/2)\leftrightarrow4\textrm{f}^{12}(^3\textrm{H}_5)5\textrm{d}_{3/2}6\textrm{s}^2(J=9/2)$

at 410.6 nm. Atoms are decelerated to velocities around 25 m/s by a 40 cm

Zeeman slower. The flux of slowed atoms is evaluated as $10^7

\textrm{s}^{-1}\textrm{cm}^{-2}$. The experiment explicitly indicates the

possibility of trapping Tm atoms in a magneto-optical trap.

\\ ( http://arxiv.org/abs/0905.2402 , 314kb)

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The replacements:

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arXiv:0807.1280

replaced with revised version Fri, 8 May 2009 14:18:19 GMT (708kb)

Title: Anisotropic Instabilities in Trapped Spinor Bose-Einstein Condensates

Authors: M. Baraban, H. F. Song, S. M. Girvin, L. I. Glazman

Categories: cond-mat.other

Comments: 8 pages, 6 figures

Journal-ref: Phys. Rev. A 78, 033609 (2008)

\\ ( http://arxiv.org/abs/0807.1280 , 708kb)

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arXiv:0806.1048

replaced with revised version Fri, 8 May 2009 20:04:39 GMT (54kb)

Title: Spin squeezing and entanglement

Authors: Geza Toth, Christian Knapp, Otfried G\"uhne, Hans J. Briegel

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

Comments: 13 pages including 6 figures and 2 tables, revtex4; v3: published

version

Journal-ref: Phys. Rev. A 79, 042334 (2009)

DOI: 10.1103/PhysRevA.79.042334

\\ ( http://arxiv.org/abs/0806.1048 , 54kb)

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arXiv:0901.3767

replaced with revised version Sat, 9 May 2009 14:33:59 GMT (641kb)

Title: Transcritical flow of a Bose-Einstein condensate through a penetrable

barrier

Authors: A.M. Leszczyszyn, G.A. El, Yu.G. Gladush, A.M. Kamchatnov

Categories: cond-mat.other nlin.PS

Comments: Revised version. 22 pages, 24 figures. Accepted for publication in

Phys. Rev. A

\\ ( http://arxiv.org/abs/0901.3767 , 641kb)

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arXiv:0903.2111

replaced with revised version Mon, 11 May 2009 09:43:07 GMT (160kb)

Title: Critical Velocity in a Bose Gas in a Moving Optical Lattice at Finite

Temperatures

Authors: Emiko Arahata, Tetsuro Nikuni

Categories: cond-mat.other

Comments: 9 pages, 5 figures

\\ ( http://arxiv.org/abs/0903.2111 , 160kb)

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arXiv:0709.1542

replaced with revised version Tue, 12 May 2009 15:04:14 GMT (460kb)

Title: Coherent single atom shuttle between two Bose-Einstein condensates

Authors: Uwe R. Fischer, Christian Iniotakis, Anna Posazhennikova

Categories: cond-mat.other quant-ph

Comments: 4 pages of RevTex4, 4 figures; Rapid Communication in Physical Review

A

Journal-ref: Phys. Rev. A 77, 031602(R) (2008)

DOI: 10.1103/PhysRevA.77.031602

\\ ( http://arxiv.org/abs/0709.1542 , 460kb)

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arXiv:0903.3185

replaced with revised version Tue, 12 May 2009 09:24:43 GMT (1552kb)

Title: Ab-initio determination of Bose-Hubbard parameters for two ultracold

atoms in an optical lattice using a three-well potential

Authors: Philipp-Immanuel Schneider, Sergey Grishkevich, and Alejandro Saenz

Categories: quant-ph

Comments: 14 pages, 11 figures; typos and minor errors corrected, five

references added, next-to-nearest neighbor hopping included in extended

Bose-Hubbard model

\\ ( http://arxiv.org/abs/0903.3185 , 1552kb)

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arXiv:0904.2504

replaced with revised version Tue, 12 May 2009 17:40:33 GMT (2876kb)

Title: Exact theoretical description of two ultracold atoms in a single site of

a 3D optical lattice using realistic interatomic interaction potentials

Authors: Sergey Grishkevich and Alejandro Saenz

Categories: quant-ph cond-mat.quant-gas

Comments: 18 pages, 10 figures

\\ ( http://arxiv.org/abs/0904.2504 , 2876kb)

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arXiv:0807.3636

replaced with revised version Wed, 13 May 2009 12:39:00 GMT (525kb)

Title: Normal-Superfluid Interface for Polarized Fermion Gases

Authors: Bert Van Schaeybroeck, Achilleas Lazarides

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

Comments: 11 pages, 5 figures

Journal-ref: Phys. Rev. A 79, 053612 (2009)

DOI: 10.1103/PhysRevA.79.053612

\\ ( http://arxiv.org/abs/0807.3636 , 525kb)

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arXiv:0904.3738

replaced with revised version Wed, 13 May 2009 19:20:15 GMT (475kb)

Title: p-wave resonant Bose gas: a "spinor supersolid"

Authors: Leo Radzihovsky, Sungsoo Choi

Categories: cond-mat.quant-gas cond-mat.other

Comments: 4 pages, 1 figure

\\ ( http://arxiv.org/abs/0904.3738 , 475kb)

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arXiv:0812.3844

replaced with revised version Thu, 14 May 2009 15:28:10 GMT (67kb)

Title: Two-dimensional weakly interacting Bose gas: equation of state

Authors: G.E. Astrakharchik, J. Boronat, J. Casulleras, I.L. Kurbakov, and

Yu.E. Lozovik

Categories: quant-ph cond-mat.other

Comments: New data points added at smaller densities. Correspondingly Table I,

Figs. 1 and 2 are updated. Results by L. Pricoupenko (Ref [15]) are given in

Table II. Comment [25] by Y. Castin is added. Minor changes in response to

referee comments

Journal-ref: Phys. Rev. A 79, 051602(R) (2009)

\\ ( http://arxiv.org/abs/0812.3844 , 67kb)

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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 ========================================================================= _______________________________________________ Matts-arxiv mailing list Matts-arxiv_at_lists.sps.uq.edu.auReceived on Tue Jun 16 2009 - 10:27:50 EST

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