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

Date: Fri, 02 May 2008 21:06:23 +1000

Date: Fri, 02 May 2008 21:06:23 +1000

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

Hi all,

There are 37 new preprints and 20 replacements in this week's mailing.

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

\\

arXiv:0804.1836

Date: Fri, 11 Apr 2008 06:31:04 GMT (10kb)

Title: Phase coherence and fragmentation in weakly interacting bosonic gases

Authors: G. S. Paraoanu

Categories: cond-mat.stat-mech

Comments: 5 pages

Journal-ref: Phys. Rev. A 77, 041605(R) (2008)

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We present a theory of measurement-induced interference for weakly

interacting Bose-Einstein condensed (BEC) gases. The many-body state resulting

from the evolution of an initial fragmented (Fock) state can be approximated as

a continuous superposition of Gross-Pitaevskii (GP) states; the measurement

breaks the initial phase symmetry, producing a distribution pattern

corresponding to only one of the GP solutions. We discuss also analytically

solvable models, such as two-mode on-chip adiabatic recombination and soliton

generation in quasi one-dimensional condensates.

\\ ( http://arxiv.org/abs/0804.1836 , 10kb)

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

\\

arXiv:0804.1850

Date: Fri, 11 Apr 2008 08:28:40 GMT (228kb)

Title: Realizing and Detecting the Haldane's Quantum Hall effect with Ultracold

Atoms

Authors: L. B. Shao, Shi-Liang Zhu, L. Sheng, D. Y. Xing, and Z. D. Wang

Categories: cond-mat.mes-hall

Comments: 5 pages

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We design an ingenious scheme to realize the Haldane's quantum Hall model

without Landau level by using ultracold atoms trapped in an optical lattice.

Three standing-wave laser beams are used to construct a wanted honeycomb

lattice, where different on-site energies in two sublattices required in the

Haldane's model can be implemented through tuning the phase of one of the laser

beams. The staggered magnetic field is generated from the Berry phase

associated with the atom moving in a region with other three standing-wave

laser beams. Moreover, we establish a relation between the Hall conductivity

and the equilibrium atomic density upon turning on a stimulated uniform

magnetic field, which enables us to detect the topological Chern number with

the density profile measurement technique that is typically used in ultracold

atoms experiments.

\\ ( http://arxiv.org/abs/0804.1850 , 228kb)

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

\\

arXiv:0804.1851

Date: Fri, 11 Apr 2008 08:35:51 GMT (25kb)

Title: Bose-Einstein Quantum Statistics and the Ground State of Solid 4He

Authors: C. Cazorla, G. E. Astrakharchik, J. Casulleras, and J. Boronat

Categories: cond-mat.other

Comments: 5 pages, 4 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

The ground state of solid $^4$He is studied using the diffusion Monte Carlo

method and a new trial wave function able to describe the supersolid. The new

wave function is symmetric under the exchange of particles and reproduces the

experimental equation of state. Results for the one-body density matrix show

the existence of off-diagonal long-range order with a very small condensate

fraction $\sim 10^{-4}$. The superfluid density of the commensurate system is

below our resolution threshold, $\rho_s/\rho < 10^{-5}$. With a 1%

concentration of vacancies the superfluid density is manifestly larger,

$\rho_s/\rho=3.2(1) \cdot 10^{-3}$.

\\ ( http://arxiv.org/abs/0804.1851 , 25kb)

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

\\

arXiv:0804.1866

Date: Fri, 11 Apr 2008 09:52:45 GMT (157kb)

Title: Statisticsb of the total number of collisions and the ordering time in a

freely expanding hard-point gas

Authors: Sanjib Sabhapandit, Ioana Bena, and Satya N. Majumdar

Categories: cond-mat.stat-mech

Comments: 18 pages, 5 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We consider a Jepsen gas of $N$ hard-point particles undergoing free

expansion on a line, starting from random initial positions of the particles

having random initial velocities. The particles undergo binary elastic

collisions upon contact and move freely in-between collisions. After a certain

ordering time $T_{o}$, the system reaches a ``fan'' state where all the

velocities are completely ordered from left to right in an increasing fashion

and there is no further collision. We compute analytically the distributions of

(i) the total number of collisions and (ii) the ordering time $T_{o}$. We show

that several features of these distributions are universal.

\\ ( http://arxiv.org/abs/0804.1866 , 157kb)

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

\\

arXiv:0804.1880

Date: Fri, 11 Apr 2008 11:48:43 GMT (29kb)

Title: The Binder Cumulant at the Kosterlitz-Thouless Transition

Authors: Martin Hasenbusch

Categories: cond-mat.stat-mech

Comments: 27 pages, 1 figure

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We study the behaviour of the Binder cumulant on finite square lattices at

the Kosterlitz-Thouless phase transition. We determine the fixed point value of

the Binder cumulant and the coefficient of the leading logarithmic correction.

These calculations are supplemented with Monte Carlo simulations of the

classical XY (plane rotator) model, the Villain model and the dual of the

absolute value solid-on-solid model. Using the single cluster algorithm, we

simulate lattices up to L=4096. For the lattice sizes reached, subleading

corrections are needed to fit the data for the Binder cumulant. We demonstrate

that the combined analysis of the Binder cumulant and the second moment

correlation length over the lattice size allows for an accurate determination

of the Kosterlitz-Thouless transition temperature on relatively small lattices.

We test the new method at the example of the 2-component phi^4 model on the

lattice.

\\ ( http://arxiv.org/abs/0804.1880 , 29kb)

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

\\

arXiv:0804.1885

Date: Fri, 11 Apr 2008 12:17:31 GMT (377kb)

Title: Collisional Properties of a Polarized Fermi Gas with Resonant

Interactions

Authors: G. M. Bruun, A. Recati, C. J. Pethick, H. Smith and S. Stringari

Categories: cond-mat.stat-mech

Comments: 4 pages, 2 figures. Nordita preprint 2008-14

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

Two-component polarized Fermi gases at low temperature represent a new normal

Fermi liquid. We show that measurements of the relaxation of the dipole mode

for relative motion of the two components, which corresponds to the giant

resonance in nuclei, will give valuable information about amplitudes for mutual

scattering of the two components. Using the concepts of Fermi-liquid theory, we

estimate the relaxation time for counterflow of the two components, and show

that for current experimental conditions, the motion of the dipole mode would

be intermediate between the hydrodynamic and collisionless limits.

\\ ( http://arxiv.org/abs/0804.1885 , 377kb)

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

\\

arXiv:0804.1908

Date: Fri, 11 Apr 2008 14:36:03 GMT (82kb)

Title: Bose-Einstein Condensation of Gases in the Frame of Quantum

Electrodynamics: Interconnection of Constituents

Authors: Mark E. Perel'man

Categories: cond-mat.other physics.gen-ph

Comments: 6 pages

License: http://creativecommons.org/licenses/by/3.0/

\\

Bose-Einstein condensate of rarified atomic gases is considered as the state

formed by exchange of virtual photons, resonant to the lowest levels of atoms;

such representation corresponds to the Einstein opinion about an

inter-influence of condensable particles. Considered interactions directly lead

to the QED structure of nonlinear potential in the Gross-Pitaevskii equation.

Linear momenta that correspond to the thermal energy of condensable atoms are

connected to near field of particles and therefore leave atoms immovable. The

estimations of these effects do not contradict the observed data; the general

quantum principles predict possibility of stimulating of BEC formation by

resonant irradiation. All this requires the spectroscopic investigation of BEC

on different steps of formation.

\\ ( http://arxiv.org/abs/0804.1908 , 82kb)

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

\\

arXiv:0804.1930

Date: Fri, 11 Apr 2008 16:24:05 GMT (62kb)

Title: Phase separated charge density wave phase in two species extended

Bose-Hubbard model

Authors: Tapan Mishra, B. K. Sahoo, Ramesh V. Pai

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

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We study the quantum phase transitions in a two component bose-mixture in a

one-dimensional optical lattice. The calculations have been performed in the

framework of the extended Bose-Hubbard model using the finite size density

matrix renormalization group method. We obtain different phase transitions for

the system for integer filling. When the inter-species on-site and the nearest

neighbor interactions are larger than the intra-species on-site and also the

nearest neighbor interactions, the system exhibits a phase separated charge

density wave (PSCDW) order that is characterized by the two species being

spatially separated and existing in the density wave phases.

\\ ( http://arxiv.org/abs/0804.1930 , 62kb)

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

\\

arXiv:0804.1888

Date: Fri, 11 Apr 2008 12:52:44 GMT (31kb)

Title: Quantum circuits for strongly correlated quantum systems

Authors: Frank Verstraete, J. Ignacio Cirac, Jose I. Latorre

Categories: quant-ph

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

In recent years, we have witnessed an explosion of experimental tools by

which quantum systems can be manipulated in a controlled and coherent way. One

of the most important goals now is to build quantum simulators, which would

open up the possibility of exciting experiments probing various theories in

regimes that are not achievable under normal lab circumstances. Here we present

a novel approach to gain detailed control on the quantum simulation of strongly

correlated quantum many-body systems by constructing the explicit quantum

circuits that diagonalize their dynamics. We show that the exact quantum

circuits underlying some of the most relevant many-body Hamiltonians only need

a finite amount of local gates. As a particularly simple instance, the full

dynamics of a one-dimensional Quantum Ising model in a transverse field with

four spins is shown to be reproduced using a quantum circuit of only six local

gates. This opens up the possibility of experimentally producing strongly

correlated states, their time evolution at zero time and even thermal

superpositions at zero temperature. Our method also allows to uncover the exact

circuits corresponding to models that exhibit topological order and to

stabilizer states.

\\ ( http://arxiv.org/abs/0804.1888 , 31kb)

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

\\

arXiv:0804.1944

Date: Fri, 11 Apr 2008 17:56:41 GMT (10kb)

Title: Counting statistics of interfering Bose-Einstein condensates

Authors: A. L. Shelankov, J. Rammer

Categories: quant-ph

Comments: 7 pages, LaTeX

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

A method able to deal with snapshot experimental data, such as the

instantaneous particle distributions in a quantum many-body system, is

presented. Subjecting the many-body wave function to a phase transformation

allows introducing as variables the discrete number of particles detected at

various locations, and the complete statistics of particle distributions is

obtained. To demonstrate the efficiency of the method, we apply it to the

snapshot density statistics of two interfering Bose-Einstein condensates, and

show that it allows a complete discussion of the statistics of interference

fringes in the matter waves.

\\ ( http://arxiv.org/abs/0804.1944 , 10kb)

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

\\

arXiv:0804.1991

Date: Sat, 12 Apr 2008 05:33:04 GMT (107kb)

Title: Ground-state properties of interacting two-component Bose gases in a

one-dimensional harmonic trap

Authors: Yajiang Hao, Shu Chen

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

Comments: 6 pages, 5 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We study ground-state properties of interacting two-component boson gases in

a one-dimensional harmonic trap by using the exact numerical diagonalization

method. Based on numerical solutions of many-body Hamiltonians, we calculate

the ground-state density distributions in the whole interaction regime for

different atomic number ratio, intra- and inter-atomic interactions. For the

case with equal intra- and inter-atomic interactions, our results clearly

display the evolution of density distributions from a Bose condensate

distribution to a Fermi-like distribution with the increase of the repulsive

interaction. Particularly, we compare our result in the strong interaction

regime to the exact result in the infinitely repulsive limit which can be

obtained by a generalized Bose-Fermi mapping. We also discuss the general case

with different intra- and inter-atomic interactions and show the rich

configurations of the density profiles.

\\ ( http://arxiv.org/abs/0804.1991 , 107kb)

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

\\

arXiv:0804.2223

Date: Mon, 14 Apr 2008 16:51:48 GMT (564kb,D)

Title: Mott-Insulator Transition for Ultracold Fermions in Two-Dimensional

Optical Lattices

Authors: N. Goldman

Categories: cond-mat.mes-hall

Comments: 7 pages, 7 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

In this work we study ultracold Fermions confined in a two-dimensional

optical lattice and we explore the Mott-insulator transition with the

Fermi-Hubbard model. On the basis of a mean-field approach, we study the phase

diagrams in the presence of a harmonic trapping potential. Local Mott-insulator

phases are shown to be generally situated in the center of the trap and

correspond to a vanishing variance of the local density. We then study the

effects induced by rotation on the Mott-insulator phase transition. In

particular, we show that the phase boundary reproduces the edge of the

Hofstadter butterfly.

\\ ( http://arxiv.org/abs/0804.2223 , 564kb)

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

\\

arXiv:0804.2068

Date: Sun, 13 Apr 2008 14:36:54 GMT (151kb)

Title: Dynamical self-trapping of Bose-Einstein condensates in shallow optical

lattices

Authors: M. Rosenkranz, D. Jaksch, F. Y. Lim, W. Bao

Categories: quant-ph cond-mat.other

Comments: 7 pages, 5 figures, RevTeX4

License: http://creativecommons.org/licenses/by-nc-sa/3.0/

\\

We observe a sudden breakdown of the transport of a strongly repulsive

Bose-Einstein condensate through a shallow optical lattice of finite width. By

using accurate numerical methods and an analytical description in terms of

nonlinear Bloch waves, we attribute this behavior to the development of a

self-trapped state. The dependence of this drop on the lattice depth and the

interaction strength is investigated. We show that by applying a constant

offset potential to the lattice region it is possible to prohibit this

self-trapping. We also observe the disappearance of the self-trapped state

after a finite time as a result of the finiteness of the lattice.

\\ ( http://arxiv.org/abs/0804.2068 , 151kb)

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

\\

arXiv:0804.1958

Date: Fri, 11 Apr 2008 20:08:04 GMT (640kb)

Title: Limits of the Plane Wave Approximation in the Measurement of Molecular

Properties

Authors: Zachary B. Walters, Stefano Tonzani, Chris H. Greene

Categories: physics.atom-ph

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

Rescattering electrons offer great potential as probes of molecular

properties on ultrafast timescales. The most famous example is molecular

tomography, in which high harmonic spectra of oriented molecules are mapped to

``tomographic images'' of the relevant molecular orbitals. The accuracy of such

reconstructions may be greatly affected by the distortion of scattering

wavefunctions from their asymptotic forms due to interactions with the parent

ion. We investigate the validity of the commonly used plane wave approximation

in molecular tomography, showing how such distortions affect the resulting

orbital reconstructions.

\\ ( http://arxiv.org/abs/0804.1958 , 640kb)

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

\\

arXiv:0804.2077

Date: Sun, 13 Apr 2008 17:12:00 GMT (704kb)

Title: Nonlinear dynamics in an alternating gradient guide for neutral

particles

Authors: M. R. Tarbutt and E. A. Hinds

Categories: physics.atom-ph

Comments: 31 pages, 12 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

Neutral particles can be guided and focussed using electric field gradients

that focus in one transverse direction and defocus in the other, alternating

between the two directions. Such a guide is suitable for transporting particles

that are attracted to strong electric fields, which cannot be guided using

static fields. Particles are only transmitted if their initial positions and

transverse speeds lie within the guide's phase space acceptance. Nonlinear

forces are always present in the guide and can severely reduce this acceptance.

We consider the effects of the two most important nonlinear forces, a term in

the force that is cubic in the off-axis displacement, and a nonlinear term

which couples together the two transverse motions. We use approximate

analytical techniques, along with numerical methods, to calculate the influence

of these nonlinear forces on the particle trajectories and on the phase space

acceptance. The cubic term alters the focussing and defocussing powers, leading

either to an increase or a decrease of the acceptance depending on its sign. We

find an approximate analytical result for the phase space acceptance including

this cubic term. Using a perturbation method we show how the coupling term

leads to slow changes in the amplitudes of the transverse oscillations. This

term reduces the acceptance when it reduces the focussing power, but has little

influence when it increases that power. It is not possible to eliminate both

nonlinear terms, but one can be made small at the expense of the other. We show

how to choose the guide parameters so that the acceptance is optimized.

\\ ( http://arxiv.org/abs/0804.2077 , 704kb)

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

\\

arXiv:0804.1986 (*cross-listing*)

Date: Sat, 12 Apr 2008 04:28:13 GMT (431kb,D)

Title: Evolution from a molecular Rydberg gas to an ultracold plasma in a

seeded supersonic expansion of NO

Authors: J. P. Morrison, C. J. Rennick, J. S. Keller, and E. R. Grant

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

Comments: 4 pages (two column) 3 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We report the spontaneous formation of a plasma from a gas of cold Rydberg

molecules. Double-resonant laser excitation promotes nitric oxide, cooled to 1

K in a seeded supersonic molecular beam, to single Rydberg states extending as

deep as 80 cm$^{-1}$ below the lowest ionization threshold. The density of

excited molecules in the illuminated volume is as high as 1 x 10$^{13}$

cm$^{-3}$. This population evolves to produce prompt free electrons and a

durable cold plasma of electrons and intact NO$^{+}$ ions.

\\ ( http://arxiv.org/abs/0804.1986 , 431kb)

------------------------------------------------------------------------------\\

arXiv:0804.2272

Date: Mon, 14 Apr 2008 21:01:05 GMT (10kb)

Title: Non-linear Differential Equations for Correlation Functions of Fermi Gas

in One Dimension

Authors: E. Bettelheim, A. G. Abanov, and P. Wiegmann

Categories: cond-mat.mes-hall

Comments: 5 pages

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We present new non-linear differential equations for space-time correlation

functions of Fermi gas in one spatial dimension. The correlation functions we

consider describe non-stationary processes out of equilibrium. The equations we

obtain are integrable equations. They generalize known non-linear differential

equations for correlation functions at equilibrium and provide vital tools to

study non-equilibrium dynamics of electronic systems. The method we developed

is based only on Wick's theorem and the hydrodynamic description of the Fermi

gas. Differential equations appear directly in bilinear form.

\\ ( http://arxiv.org/abs/0804.2272 , 10kb)

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

\\

arXiv:0804.2280

Date: Tue, 15 Apr 2008 18:23:55 GMT (36kb)

Title: A Mean Field Analysis of Pairing in Asymmetric Fermi Systems at Finite

Temperature

Authors: Rishi Sharma, Sanjay Reddy

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

Comments: 17 pages, 7 figures

Report-no: LA-UR-08-2124

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We study the phase diagram of a two component Fermi system with a weak

attractive interaction. Our analysis includes the leading order Hartree energy

shifts and pairing correlations at finite temperature and chemical potential

difference between the two fermion species. We show that in an asymmetric

system, the Hartree shift to the single particle energies are important for the

phase competition between normal and superfluid phase and can change the phase

transition curve qualitatively. At large asymmetry we find that a novel but

somewhat fragile superfluid state can be favored due to finite temperature

effects. We also investigate the transition between the normal phase and an

inhomogeneous superfluid phase to study how gradient instabilities evolve with

temperature and asymmetry. Finally, we adopt our analysis to study the density

profiles of similar asymmetric Fermi systems that are being observed in cold

atom experiments.

\\ ( http://arxiv.org/abs/0804.2280 , 36kb)

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

\\

arXiv:0804.2431

Date: Tue, 15 Apr 2008 17:04:57 GMT (306kb)

Title: Time evolution of 1D gapless models from a domain-wall initial state:

SLE continued?

Authors: Pasquale Calabrese, Christian Hagendorf, and Pierre Le Doussal

Categories: cond-mat.stat-mech

Comments: 27 pages, 10 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We study the time evolution of quantum one-dimensional gapless systems

evolving from initial states with a domain-wall. We generalize the

path-integral imaginary time approach that together with boundary conformal

field theory allows to derive the time and space dependence of general

correlation functions. The latter are explicitly obtained for the Ising

universality class, and the typical behavior of one- and two-point functions is

derived for the general case. Possible connections with the stochastic Loewner

evolution are discussed and explicit results for one-point time dependent

averages are obtained for generic \kappa for boundary conditions corresponding

to SLE. We use this set of results to predict the time evolution of the

entanglement entropy and obtain the universal constant shift due to the

presence of a domain wall in the initial state.

\\ ( http://arxiv.org/abs/0804.2431 , 306kb)

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

\\

arXiv:0804.2306

Date: Tue, 15 Apr 2008 04:20:29 GMT (549kb)

Title: Optical bistability at low light level due to collective atomic recoil

Authors: M. Vengalattore, M. Hafezi, M. D. Lukin and M. Prentiss

Categories: quant-ph

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We demonstrate optical nonlinearities due to the interaction of weak optical

fields with the collective motion of a strongly dispersive ultracold gas. The

combination of a recoil-induced resonance (RIR) in the high gain regime and

optical waveguiding within the dispersive medium enables us to achieve a

collective atomic cooperativity of $275 \pm 50$ even in the absence of a

cavity. As a result, we observe optical bistability at input powers as low as

20 pW. The present scheme allows for dynamic optical control of the dispersive

properties of the ultracold gas using very weak pulses of light. The

experimental observations are in good agreement with a theoretical model.

\\ ( http://arxiv.org/abs/0804.2306 , 549kb)

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

\\

arXiv:0804.2504

Date: Wed, 16 Apr 2008 00:57:00 GMT (282kb)

Title: Applying matrix product operators to model systems with long-range

interactions

Authors: Gregory M. Crosswhite, Andrew C. Doherty, Guifre Vidal

Categories: cond-mat.other

Comments: 6 pages, 3 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

An algorithm is presented which computes a translationally invariant matrix

product state approximation of the ground state of an infinite 1D system; it

does this by embedding sites into an approximation of the infinite

``environment'' of the chain, allowing the sites to relax, and then merging

them with the environment in order to refine the approximation. By making use

of matrix product operators, our approach is able to directly model any

long-range interaction that can be systematically approximated by a series of

decaying exponentials. We apply our techniques to compute the ground state of

the Haldane-Shastry model and present results.

\\ ( http://arxiv.org/abs/0804.2504 , 282kb)

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

\\

arXiv:0804.2509

Date: Wed, 16 Apr 2008 19:02:06 GMT (59kb)

Title: Infinite size density matrix renormalization group, revisited

Authors: I. P. McCulloch

Categories: cond-mat.str-el

Comments: 12 pages, 3 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

I revisit the infinite-size variant of the Density Matrix Renormalization

Group (iDMRG) algorithm for obtaining a fixed-point translationally invariant

matrix product wavefunction in the context of one-dimensional quantum systems.

A crucial ingredient of this algorithm is an efficient transformation for

obtaining the matrix elements of the wavefunction as the lattice size is

increased, and I introduce here a versatile transformation that is demonstrated

to be much more effective than previous versions. The resulting algorithm has a

surprisingly close relationship to Vidal's Time Evolving Block Decimation for

infinite systems, but allows much faster convergence. Access to a

translationally invariant matrix product state allows the calculation of

correlation functions based on the transfer matrix, which directly gives the

spectrum of all correlation lengths. I also show some advantages of the Matrix

Product Operator (MPO) technique for constructing expectation values of higher

moments, such as the exact variance $<(H-E)^2>$.

\\ ( http://arxiv.org/abs/0804.2509 , 59kb)

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

\\

arXiv:0804.2580

Date: Wed, 16 Apr 2008 12:08:06 GMT (22kb)

Title: Free expansion of a Lieb-Liniger gas: Asymptotic form of the wave

functions

Authors: D. Juki\'c, R. Pezer, T. Gasenzer, H. Buljan

Categories: cond-mat.other

Comments: 7 pages, 2 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

The asymptotic form of the wave functions describing a freely expanding

Lieb-Liniger gas is derived by using a Fermi-Bose transformation for

time-dependent states, and the stationary phase approximation. We find that

asymptotically, the wave functions approach the Tonks-Girardeau structure,

while the interaction energy decays as a power law with time,

$E_\mathrm{int}\propto t^{-3}$. The analysis encompasses a large class of

initial conditions, including the ground states of a Lieb-Liniger gas in

physically realistic external potentials.

\\ ( http://arxiv.org/abs/0804.2580 , 22kb)

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

\\

arXiv:0804.2600

Date: Wed, 16 Apr 2008 17:22:09 GMT (850kb)

Title: Correlation Effects in Ultracold Two-Dimensional Bose Gases

Authors: Lih-King Lim, C. Morais Smith, and H. T. C. Stoof

Categories: cond-mat.stat-mech

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We study various properties of an ultracold two-dimensional (2D) Bose gas

that are beyond a mean-field description. We first derive the effective

interaction for such a system as realized in current experiments, which

requires the use of an energy dependent $T$-matrix. Using this result, we then

solve the mean-field equation of state of the modified Popov theory, and

compare it with the usual Hartree-Fock theory. We show that even though the

former theory does not suffer from infrared divergences in both the normal and

superfluid phases, there is an unphysical density discontinuity close to the

Berezinskii-Kosterlitz-Thouless transition. We then improve upon the mean-field

description by using a renormalization group approach and show how the density

discontinuity is resolved. The flow equations in 2D, in particular of the

symmetry-broken phase, already contain some unique features pertinent to the 2D

XY model, even though vortices have not been included explicitly. We also

compute various many-body correlators, and show that correlation effects beyond

the Hartree-Fock theory are important already in the normal phase as

criticality is approached. We finally extend our results to the inhomogeneous

case of a trapped Bose gas using the local-density approximation and show that

close to criticality, the renormalization group approach is required for the

accurate determination of the density profile.

\\ ( http://arxiv.org/abs/0804.2600 , 850kb)

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

\\

arXiv:0804.2609

Date: Wed, 16 Apr 2008 14:23:50 GMT (876kb)

Title: Anderson localization of a non-interacting Bose-Einstein condensate

Authors: G. Roati, C. D'Errico, L. Fallani, M. Fattori, C. Fort, M. Zaccanti,

G. Modugno, M. Modugno, M. Inguscio

Categories: cond-mat.dis-nn

Comments: 5 pages

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

One of the most intriguing phenomena in physics is the localization of waves

in disordered media. This phenomenon was originally predicted by Anderson,

fifty years ago, in the context of transport of electrons in crystals. Anderson

localization is actually a much more general phenomenon, and it has been

observed in a large variety of systems, including light waves. However, it has

never been observed directly for matter waves. Ultracold atoms open a new

scenario for the study of disorder-induced localization, due to high degree of

control of most of the system parameters, including interaction. Here we employ

for the first time a noninteracting Bose-Einstein condensate to study Anderson

localization. The experiment is performed with a onedimensional quasi-periodic

lattice, a system which features a crossover between extended and exponentially

localized states as in the case of purely random disorder in higher dimensions.

Localization is clearly demonstrated by investigating transport properties,

spatial and momentum distributions. We characterize the crossover, finding that

the critical disorder strength scales with the tunnelling energy of the atoms

in the lattice. Since the interaction in the condensate can be controlled at

will, this system might be employed to solve open questions on the interplay of

disorder and interaction and to explore exotic quantum phases.

\\ ( http://arxiv.org/abs/0804.2609 , 876kb)

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

\\

arXiv:0804.2610

Date: Wed, 16 Apr 2008 14:31:51 GMT (57kb)

Title: Phase diagram and binding energy of interacting Bose gases

Authors: M. M\"annel, K. Morawetz, M. Schreiber, P. Lipavsk\'y

Categories: cond-mat.stat-mech

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

From the many-body T-matrix the condition for a medium-dependent bound state

and its binding energy is derived for a homogeneous interacting Bose gas. This

condition provides the critical line in the phase diagram in terms of the

medium-dependent scattering length. Separating the Bose pole from the

distribution function the influence of a Bose condensate is discussed and a

thermal minimum of the critical scattering length is found.

\\ ( http://arxiv.org/abs/0804.2610 , 57kb)

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

\\

arXiv:0804.2611

Date: Wed, 16 Apr 2008 14:37:00 GMT (115kb)

Title: A Maxwell's demon in the generation of an intense and slow guided beam

Authors: Ga\"el Reinaudi (LKB - Lhomond), David Guery-Odelin (LKB - Lhomond,

LCAR)

Categories: cond-mat.other

Proxy: ccsd hal-00273918

\\

We analyze quantitatively the generation of a continuous beam of atoms by the

periodic injection of individual packets in a guide, followed by their

overlapping. We show that slowing the packets using a moving mirror before

their overlapping enables an optimal gain on the phase space density of the

generated beam. This is interpreted as a Maxwell's demon type strategy as the

experimentalist exploits the information on the position and velocity of the

center of mass of each packet.

\\ ( http://arxiv.org/abs/0804.2611 , 115kb)

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

\\

arXiv:0804.2638

Date: Wed, 16 Apr 2008 16:23:52 GMT (26kb)

Title: Normal state of highly polarized Fermi gases: Full many-body treatment

Authors: R. Combescot and S. Giraud

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

Comments: 5 pages, 1 figure

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We consider a single \down atom within a Fermi sea of \up atoms. We elucidate

by a full many-body analysis the quite mysterious agreement between Monte-Carlo

results and approximate calculations taking only into account single

particle-hole excitations. It results from a nearly perfect destructive

interference of the contributions of states with more than one particle-hole

pair. This is linked to the remarkable efficiency of the expansion in powers of

hole wavevectors, the lowest order leading to perfect interference. Going up to

two particle-hole pairs gives an essentially perfect agreement with known exact

results. Hence our treatment amounts to an exact solution of this problem.

\\ ( http://arxiv.org/abs/0804.2638 , 26kb)

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

\\

arXiv:0804.2577

Date: Wed, 16 Apr 2008 13:13:59 GMT (155kb)

Title: Cold Fermi atomic gases in a pumped optical resonator

Authors: Jonas Larson, Giovanna Morigi, Maciej Lewenstein

Categories: quant-ph

Comments: Two column, three figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We study systems of fully polarized ultracold atomic gases obeying Fermi

statistics. The atomic transition interacts dispersively with a mode of a

standing-wave cavity, which is coherently pumped by a laser. In this setup, the

intensity of the intracavity field is determined by the refractive index of the

atomic medium, and thus by the atomic density distribution. Vice-versa, the

density distribution of the atom is determined by the cavity field potential,

whose depth is proportional to the intracavity field amplitude. In this work we

show that this nonlinearity leads to a novel kind of instability in the

intracavity intensity, which differs substantially from dispersive optical

bistability, as this effect is already present in the regime, where the atomic

dipole is proportional to the cavity field. Such instability is driven by the

matter waves fluctuations and exhibits a peculiar dependence on the

fluctuations in the atomic density distribution.

\\ ( http://arxiv.org/abs/0804.2577 , 155kb)

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

\\

arXiv:0804.2705

Date: Thu, 17 Apr 2008 00:24:57 GMT (299kb)

Title: Phase Separation in Bose-Fermi-Fermi Mixtures as a Probe of Fermi

Superfluidity

Authors: S. G. Bhongale and H. Pu

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

Comments: 4 pages, 3 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We study the phase diagram of a mixture of Bose-Einstein condensate and a

two-component Fermi gas. In particular, we identify the regime where the

homogeneous system becomes unstable again phase separation. We show that, under

proper conditions, the phase separation phenomenon can be exploited as a robust

probe of Fermi superfluid.

\\ ( http://arxiv.org/abs/0804.2705 , 299kb)

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

\\

arXiv:0804.2759

Date: Thu, 17 Apr 2008 10:22:58 GMT (222kb)

Title: Ground-state properties of few-Boson system in a one-dimensional hard

wall potential with split

Authors: Xiangguo Yin, Yajiang Hao, Shu Chen, Yunbo Zhang

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

Comments: 7 pages, 9 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We carry out a detailed examination of the ground state property of few-boson

system in a one-dimensional hard wall potential with a $\delta -$ split in the

center. In the Tonks-Girardeau limit with infinite repulsion between particles,

we use the Bose-Fermi mapping to construct the exact $N-$ particle ground state

wavefunction which allows us to study the correlation properties accurately.

For the general case with finite inter-particle interaction, the exact

diagonalization method is exploited to study the ground-state density

distribution, occupation number distribution, and momentum distribution for

variable interaction strengths and barrier heights. The secondary peaks in the

momentum distribution reveal the interference between particles on the two

sides of the split, which is more prominent for large barrier strength and

small interaction strength.

\\ ( http://arxiv.org/abs/0804.2759 , 222kb)

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

\\

arXiv:0804.2762

Date: Thu, 17 Apr 2008 10:34:50 GMT (43kb)

Title: Fast Convergence of Path Integrals for Many-body Systems

Authors: Aleksandar Bogojevic, Ivana Vidanovic, Antun Balaz, Aleksandar Belic

Categories: cond-mat.stat-mech

Comments: 20 pages, 6 figures, 1 table

Journal-ref: Phys. Lett. A372 (2008) 3341

DOI: 10.1016/j.physleta.2008.01.079

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We generalize a recently developed method for accelerated Monte Carlo

calculation of path integrals to the physically relevant case of generic

many-body systems. This is done by developing an analytic procedure for

constructing a hierarchy of effective actions leading to improvements in

convergence of $N$-fold discretized many-body path integral expressions from

1/N to $1/N^p$ for generic $p$. In this paper we present explicit solutions

within this hierarchy up to level $p=5$. Using this we calculate the low lying

energy levels of a two particle model with quartic interactions for several

values of coupling and demonstrate agreement with analytical results governing

the increase in efficiency of the new method. The applicability of the

developed scheme is further extended to the calculation of energy expectation

values through the construction of associated energy estimators exhibiting the

same speedup in convergence.

\\ ( http://arxiv.org/abs/0804.2762 , 43kb)

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

\\

arXiv:0804.2769

Date: Thu, 17 Apr 2008 11:13:34 GMT (116kb)

Title: Probing correlated phases of bosons in optical lattices via trap

squeezing

Authors: Tommaso Roscilde

Categories: cond-mat.str-el cond-mat.dis-nn

Comments: 4 pages, 4 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We theoretically analyze the response properties of ultracold bosons in

optical lattices to the static variation of the trapping potential. We show

that, upon an increase of such potential (trap squeezing), the density

variations in a central region, with linear size of >~ 10 wavelengths, reflect

that of the bulk system upon changing the chemical potential: hence measuring

the density variations gives direct access to the bulk compressibility. When

combined with standard time-of-flight measurements, this approach has the

potential of unambiguously detecting the appearence of the most fundamental

phases realized by bosons in optical lattices, with or without further external

potentials: superfluid, Mott insulator, band insulator and Bose glass.

\\ ( http://arxiv.org/abs/0804.2769 , 116kb)

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

\\

arXiv:0804.2824

Date: Thu, 17 Apr 2008 14:16:10 GMT (92kb)

Title: Perturbation theory for bright spinor Bose--Einstein condensate solitons

Authors: Evgeny V. Doktorov, Jiandong Wang, Jianke Yang

Categories: cond-mat.other

Comments: 12 pages, 3 figures

Journal-ref: Phys. Rev. A 77, 043617 (2008)

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We develop a perturbation theory for bright solitons of the F=1 integrable

spinor Bose-Einstein condensate (BEC) model. The formalism is based on using

the Riemann-Hilbert problem and provides the means to analytically calculate

evolution of the soliton parameters. Both rank-one and rank-two soliton

solutions of the model are obtained. We prove equivalence of the rank-one

soliton and the ferromagnetic rank-two soliton. Taking into account a splitting

of a perturbed polar rank-two soliton into two ferromagnetic solitons, it is

sufficient to elaborate a perturbation theory for the rank-one solitons only.

Treating a small deviation from the integrability condition as a

perturbation, we describe the spinor BEC soliton dynamics in the adiabatic

approximation. It is shown that the soliton is quite robust against such a

perturbation and preserves its velocity, amplitude, and population of different

spin components, only the soliton frequency acquires a small shift. Results of

numerical simulations agree well with the analytical predictions, demonstrating

only slight soliton profile deformation.

\\ ( http://arxiv.org/abs/0804.2824 , 92kb)

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

\\

arXiv:0804.2881

Date: Thu, 17 Apr 2008 19:23:14 GMT (262kb,D)

Title: Soliton response to transient trap variations

Authors: S. Sree Ranjani, Utpal Roy, P. K. Panigrahi and A. K. Kapoor

Categories: cond-mat.other

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

The response of bright and dark solitons to rapid variations in an expulsive

longitudinal trap is investigated. We concentrate on the effect of transient

changes in the trap frequency in the form of temporal delta kicks and the

hyperbolic cotangent functions. Exact expressions are obtained for the soliton

profiles. This is accomplished using the fact that a suitable linear

Schrodinger stationary state solution in time can be effectively combined with

the solutions of non-linear Schrodinger equation, for obtaining solutions of

the Gross-Pitaevskii equation with time dependent scattering length in a

harmonic trap. Interestingly, there is rapid pulse amplification in certain

scenarios.

\\ ( http://arxiv.org/abs/0804.2881 , 262kb)

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

\\

arXiv:0804.1377 (*cross-listing*)

Date: Tue, 8 Apr 2008 22:12:17 GMT (85kb)

Title: Quantum Noise as an Entanglement Meter

Authors: Israel Klich, Leonid Levitov

Categories: quant-ph astro-ph cond-mat.mes-hall hep-th

License: http://creativecommons.org/licenses/by-nc-sa/3.0/

\\

Entanglement entropy, which is a measure of quantum correlations between

separate parts of a many-body system, has emerged recently as a fundamental

quantity in broad areas of theoretical physics, from cosmology and field theory

to condensed matter theory and quantum information. The universal appeal of the

entanglement entropy concept is related, in part, to the fact that it is

defined solely in terms of the many-body density matrix of the system, with no

relation to any particular observables. However, for the same reason, it has

not been clear how to access this quantity experimentally. Here we derive a

universal relation between entanglement entropy and the fluctuations of current

flowing through a quantum point contact (QPC) which opens a way to perform a

direct measurement of entanglement entropy. In particular, by utilizing

space-time duality of 1d systems, we relate electric noise generated by opening

and closing the QPC periodically in time with the seminal S = 1/3 log L

prediction of conformal field theory.

\\ ( http://arxiv.org/abs/0804.1377 , 85kb)

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

\\

arXiv:0804.2874

Date: Thu, 17 Apr 2008 18:41:46 GMT (163kb)

Title: Analytical solution for optimal squeezing of wave packet of a trapped

quantum particle

Authors: Ilya Grigorenko

Categories: quant-ph

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

Optimal control problem with a goal to squeeze wave packet of a trapped

quantum particle is considered and solved analytically using adiabatic

approximation. The analytical solution that drives the particle into a highly

localized final state is presented for a case of an infinite well trapping

potential. The presented solution may be applied to increase the resolution of

atom lithography.

\\ ( http://arxiv.org/abs/0804.2874 , 163kb)

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

The replacements:

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

\\

arXiv:0711.4729

replaced with revised version Fri, 11 Apr 2008 17:32:04 GMT (598kb)

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

Bose-Hubbard model

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

Categories: cond-mat.other quant-ph

Comments: 11 pages of RevTex4, 2 figures; significantly extended, with several

analytically solvable cases added, to appear in Physical Review A

\\ ( http://arxiv.org/abs/0711.4729 , 598kb)

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

\\

arXiv:0801.3465

replaced with revised version Fri, 11 Apr 2008 14:59:09 GMT (49kb)

Title: Mixtures of strongly interacting bosons in optical lattices

Authors: P. Buonsante, S.M. Giampaolo, F. Illuminati, V. Penna and A. Vezzani

Categories: cond-mat.other quant-ph

Comments: 10 pages, 3 figures; some changes in the text and abstract have been

introduced; coherence now given in terms of visibility; a couple of new

reference added

\\ ( http://arxiv.org/abs/0801.3465 , 49kb)

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

\\

arXiv:cond-mat/0703610

replaced with revised version Mon, 14 Apr 2008 04:57:19 GMT (42kb)

Title: Dynamics of one-dimensional Bose liquids: Andreev-like reflection at

Y-junctions and absence of the Aharonov-Bohm effect

Authors: Akiyuki Tokuno, Masaki Oshikawa, Eugene Demler

Categories: cond-mat.other cond-mat.mes-hall

Comments: 4 pages, 2 figures, final version

Journal-ref: Phys. Rev. Lett. 100, 140402 (2008)

\\ ( http://arxiv.org/abs/cond-mat/0703610 , 42kb)

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

\\

arXiv:0707.2307

replaced with revised version Mon, 14 Apr 2008 09:22:07 GMT (12kb)

Title: Microcanonical quantum fluctuation theorems

Authors: Peter Talkner, Peter Hanggi, Manuel Morillo

Categories: cond-mat.stat-mech

Comments: revised and extended version

\\ ( http://arxiv.org/abs/0707.2307 , 12kb)

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

\\

arXiv:0707.4435

replaced with revised version Sat, 12 Apr 2008 21:54:04 GMT (85kb)

Title: Emulating Non-Abelian Topological Matter in Cold Atom Optical Lattices

Authors: V. W. Scarola and S. Das Sarma

Categories: cond-mat.other

Journal-ref: Phys. Rev. A 77, 023612 (2008)

\\ ( http://arxiv.org/abs/0707.4435 , 85kb)

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

\\

arXiv:0710.0522

replaced with revised version Mon, 14 Apr 2008 12:51:25 GMT (714kb)

Title: Localization and delocalization of ultracold bosonic atoms in finite

optical lattices

Authors: Dirk-S\"oren L\"uhmann, Kai Bongs, Klaus Sengstock, Daniela Pfannkuche

Categories: cond-mat.other

Comments: 8 pages, 10 figures. Published version

Journal-ref: Phys. Rev. A 77, 023620 (2008)

DOI: 10.1103/PhysRevA.77.023620

\\ ( http://arxiv.org/abs/0710.0522 , 714kb)

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

\\

arXiv:0710.1938

replaced with revised version Mon, 14 Apr 2008 09:08:06 GMT (538kb)

Title: Stripe Formation in Fermionic Atoms on 2-D Optical Lattice inside a Box

Trap: DMRG Studies for Repulsive Hubbard Model with Open Boundary Condition

Authors: M. Machida, M. Okumura, S. Yamada

Categories: cond-mat.str-el

Journal-ref: Phys. Rev. A 77, 033619 (2008)

DOI: 10.1103/PhysRevA.77.033619

\\ ( http://arxiv.org/abs/0710.1938 , 538kb)

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

\\

arXiv:0801.3127

replaced with revised version Sun, 13 Apr 2008 07:50:57 GMT (17kb)

Title: Phase Diagram of Cold Polarized Fermi Gas in Two Dimensions

Authors: Lianyi He and Pengfei Zhuang

Categories: cond-mat.supr-con

Comments: V1: 4 pages, 1 figure. V2: 5 pages, 1 figure; typos corrected;

references added; some statement in the introduction changed; submitted to

PRA

\\ ( http://arxiv.org/abs/0801.3127 , 17kb)

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

\\

arXiv:0804.1621

replaced with revised version Mon, 14 Apr 2008 08:32:31 GMT (463kb)

Title: Direct observation of Anderson localization of matter-waves in a

controlled disorder

Authors: Juliette Billy (LCFIO), Vincent Josse (LCFIO), Zhanchun Zuo (LCFIO),

Alain Bernard (LCFIO), Ben Hambrecht (LCFIO), Pierre Lugan (LCFIO), David

Cl\'ement (LCFIO), Laurent Sanchez-Palencia (LCFIO), Philippe Bouyer (LCFIO),

Alain Aspect (LCFIO)

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

Proxy: ccsd hal-00271681

\\ ( http://arxiv.org/abs/0804.1621 , 463kb)

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

\\

arXiv:0804.1971

Date: Fri, 11 Apr 2008 22:41:04 GMT (470kb,D)

Title: Scalability of quantum computation with addressable optical lattices

Authors: Travis R. Beals, Jiri Vala, K. Birgitta Whaley

Categories: quant-ph

Comments: 17 pages, 5 figures. Accepted for publication in Physical Review A

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\

We make a detailed analysis of error mechanisms, gate fidelity, and

scalability of proposals for quantum computation with neutral atoms in

addressable (large lattice constant) optical lattices. We have identified

possible limits to the size of quantum computations, arising in 3D optical

lattices from current limitations on the ability to perform single qubit gates

in parallel and in 2D lattices from constraints on laser power. Our results

suggest that 3D arrays as large as 100 x 100 x 100 sites (i.e., $\sim 10^6$

qubits) may be achievable, provided two-qubit gates can be performed with

sufficiently high precision and degree of parallelizability. Parallelizability

of long range interaction-based two-qubit gates is qualitatively compared to

that of collisional gates. Different methods of performing single qubit gates

are compared, and a lower bound of $1 \times 10^{-5}$ is determined on the

error rate for the error mechanisms affecting $^{133}$Cs in a blue-detuned

lattice with Raman transition-based single qubit gates, given reasonable limits

on experimental parameters.

\\ ( http://arxiv.org/abs/0804.1971 , 470kb)

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

\\

arXiv:0801.3362

replaced with revised version Mon, 14 Apr 2008 15:33:59 GMT (978kb,D)

Title: AC electric trapping of neutral atoms

Authors: Sophie Schlunk, Adela Marian, Wieland Schoellkopf, Gerard Meijer

Categories: physics.atom-ph

Comments: 10 pages, 13 figures, updated version, added journal reference

Journal-ref: Phys. Rev. A 77, 043408 (2008)

DOI: 10.1103/PhysRevA.77.043408

\\ ( http://arxiv.org/abs/0801.3362 , 978kb)

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

\\

arXiv:0712.2070

replaced with revised version Tue, 15 Apr 2008 18:14:39 GMT (359kb)

Title: Analytic models of ultra-cold atomic collisions at negative energies for

application to confinement-induced resonances

Authors: S. G. Bhongale, S. J. J. M. F. Kokkelmans, Ivan H. Deutsch

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

Comments: 9 pages

\\ ( http://arxiv.org/abs/0712.2070 , 359kb)

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

\\

arXiv:0707.1454

replaced with revised version Wed, 16 Apr 2008 01:32:35 GMT (836kb)

Title: Algorithms for entanglement renormalization

Authors: G. Vidal

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

Comments: 20 pages, 35 figures. Time evolution algorithm removed and

transferred to arXiv:0706.0868

\\ ( http://arxiv.org/abs/0707.1454 , 836kb)

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

\\

arXiv:0708.4197

replaced with revised version Wed, 16 Apr 2008 15:13:31 GMT (481kb)

Title: Optimal transport of ultracold atoms in the non-adiabatic regime

Authors: A. Couvert (LKB - Lhomond), T. Kawalec (LKB - Lhomond), G. Reinaudi

(LKB - Lhomond), David Guery-Odelin (LKB - Lhomond, LCAR)

Categories: cond-mat.other

Proxy: ccsd hal-00168928

\\ ( http://arxiv.org/abs/0708.4197 , 481kb)

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

\\

arXiv:0712.0557

replaced with revised version Wed, 16 Apr 2008 00:05:40 GMT (41kb)

Title: Kinetics of the Phase Separation Transition in Cold-Atom Boson-Fermion

Mixtures

Authors: Dmitry Solenov and Dmitry Mozyrsky

Categories: cond-mat.mes-hall

Comments: 4 pages 1 figure, typos corrected

Journal-ref: Phys. Rev. Lett. 100, 150402 (2008)

\\ ( http://arxiv.org/abs/0712.0557 , 41kb)

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

\\

arXiv:0704.3926

replaced with revised version Wed, 16 Apr 2008 08:18:37 GMT (10kb)

Title: Stabilities of one-dimensional stationary states of Bose-Einstein

condensates

Authors: Wenhua Hai, Guishu Chong, Jianwen Song

Categories: quant-ph

Comments: 12 pages

Journal-ref: Phys. Lett. A372, 2558 (2008)

\\ ( http://arxiv.org/abs/0704.3926 , 10kb)

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

\\

arXiv:0710.3578

replaced with revised version Wed, 16 Apr 2008 14:28:07 GMT (231kb)

Title: Schr\"odinger-cat state creation by a measurement

Authors: I.E. Mazets, G. Kurizki, M.K. Oberthaler, J. Schmiedmayer

Categories: quant-ph

Comments: 4 pages (revtex4), 2 figures

\\ ( http://arxiv.org/abs/0710.3578 , 231kb)

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

\\

arXiv:0803.1889 (*cross-listing*)

replaced with revised version Wed, 16 Apr 2008 01:17:50 GMT (260kb)

Title: Atom-Pair Tunneling in Optical Lattices

Authors: J.-Q. Liang, J.-L. Liu, W.-D. Li, Z.-J. Li

Categories: cond-mat.other quant-ph

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\ ( http://arxiv.org/abs/0803.1889 , 260kb)

------------------------------------------------------------------------------\\

arXiv:0711.4445 (*cross-listing*)

replaced with revised version Thu, 17 Apr 2008 00:45:12 GMT (193kb)

Title: Two-mode Bose-Einstein condensate in a high-frequency driving field that

directly couples the two modes

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

Singapore)

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

Comments: 5 pages, 3 figures, revised version, to appear in Phys. Rev. A

\\ ( http://arxiv.org/abs/0711.4445 , 193kb)

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

\\

arXiv:0802.0549

replaced with revised version Thu, 17 Apr 2008 15:30:09 GMT (10kb)

Title: Analytical solution of the bosonic three-body problem

Authors: Alexander O. Gogolin, Christophe Mora, and Reinhold Egger

Categories: cond-mat.other

Comments: 4 pages, published version

Journal-ref: Phys. Rev. Lett. 100, 140404 (2008)

DOI: 10.1103/PhysRevLett.100.140404

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

\\ ( http://arxiv.org/abs/0802.0549 , 10kb)

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

Till next time,

Matt.

-- ========================================================================= Dr M. J. Davis, Senior Lecturer in Physics School of Physical Sciences, email: mdavis_at_physics.uq.edu.au University of Queensland, ph : +61 7 334 69824 Brisbane, QLD 4072, fax : +61 7 336 51242 Australia. http://www.physics.uq.edu.au/people/mdavis/ ========================================================================= Matt's arXiv selection: weekly summary of cold-atom papers from arXiv.org http://www.physics.uq.edu.au/people/mdavis/matts_arXiv/ ========================================================================= Legal stuff: Unless stated otherwise, this e-mail represents only the views of the sender and not the views of the University of Queensland =========================================================================Received on Thu May 08 2008 - 11:46:30 EST

*
This archive was generated by hypermail 2.2.0
: Thu May 08 2008 - 11:51:42 EST
*