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

Date: Thu, 08 May 2008 08:27:56 +1000

Date: Thu, 08 May 2008 08:27:56 +1000

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

Dear subscribers,

There is currently a vacancy for a tenured faculty member in the field of

theoretical quantum atom optics at the University of Queensland (my

institution). Applications close on June 16, 2008. The full details can be

found here:

http://www.seek.com.au/showjob.asp?jobid=12602228

Onto the usual business: week there are 34 new preprints and 18 replacements.

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arXiv:0804.2888

Date: Thu, 17 Apr 2008 20:49:38 GMT (878kb)

Title: Bose-Einstein condensates in disordered potentials

Authors: Leonardo Fallani, Chiara Fort and Massimo Inguscio

Categories: cond-mat.dis-nn

Comments: 43 pages, 17 figures, to be published in "Advances in Atomic,

Molecular, and Optical Physics"

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

\\

The interplay between disorder and interactions is a "leit-motiv" of

condensed matter physics, since it constitutes the driving mechanism of the

metal-insulator transition. Bose-Einstein condensates in optical potentials are

proving to be powerful tools to quantum simulate disordered systems. We will

review the main experimental and theoretical results achieved in the last few

years in this rapidly developing field.

\\ ( http://arxiv.org/abs/0804.2888 , 878kb)

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arXiv:0804.2894

Date: Thu, 17 Apr 2008 20:10:04 GMT (17kb)

Title: Optimal non-linear passage through a quantum critical point

Authors: Roman Barankov and Anatoli Polkovnikov

Categories: cond-mat.other

Comments: 4+ pages, 2 figures

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

\\

We analyze the problem of optimal adiabatic passage through a quantum

critical point. We show that to minimize the number of defects the tuning

parameter should be changed as a power-law in time. The optimal power is

proportional to the logarithm of the total passage time multiplied by universal

critical exponents characterizing the phase transition. We support our results

by the general scaling analysis and by explicit calculations for the transverse

field Ising model.

\\ ( http://arxiv.org/abs/0804.2894 , 17kb)

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arXiv:0804.2915

Date: Thu, 17 Apr 2008 22:25:21 GMT (971kb)

Title: Preparing a highly degenerate Fermi gas in an optical lattice

Authors: J. R. Williams, J. H. Huckans, R. W. Stites, E. L. Hazlett, and K. M.

O'Hara

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

Comments: 5 pages, 4 figures

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

\\

We propose a method to prepare a sample of fermionic atoms in a

three-dimensional (3D) optical lattice at unprecedentedly low temperatures and

uniform filling factors. The process involves adiabatic loading of atoms into

multiple energy bands of an optical lattice followed by a filtering stage

whereby atoms from all but the ground band are removed. Of critical importance

is the use of a non-harmonic trapping potential, taken here to be the radial

profile of a high-order Laguerre-Gaussian laser beam, to provide external

confinement for the atoms. For realistic experimental parameters, this

procedure should produce samples with temperatures $\sim10^{-3}$ of the Fermi

temperature. This would allow the investigation of the low-temperature phase

diagram of the Fermi-Hubbard model as well as the initialization of a

high-fidelity quantum register.

\\ ( http://arxiv.org/abs/0804.2915 , 971kb)

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arXiv:0804.2990

Date: Fri, 18 Apr 2008 10:45:51 GMT (12kb)

Title: Quantum kinetic theory for the collapse of Bose-Einstein condensate

Authors: Shyamal Biswas

Categories: cond-mat.stat-mech

Comments: 3 pages, 1 figure

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

\\

We show how to apply the quantum kinetic theory in an inhomogeneous system

like harmonically trapped Bose condensate. We calculate the temperature

dependence of the critical number of particles by a quantum kinetic theory

within the Hartree-Fock approximation and find that there is a dramatic

increase in the critical number of particles as the condensation point is

approached. Our results support the experimental result which was obtained well

below the condensation temperature. The nature of the temperature dependence of

the critical number obtained from the quantum kinetic theory is the same as

obtained from the scaling theory.

\\ ( http://arxiv.org/abs/0804.2990 , 12kb)

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arXiv:0804.3022

Date: Fri, 18 Apr 2008 13:57:03 GMT (138kb)

Title: Quantum reflection: The invisible quantum barrier

Authors: J. X. de Carvalho, M. S. Hussein, and Weibin Li

Categories: cond-mat.other

Comments: 13pages, 6figures

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

\\

We construct the invisible quantum barrier which represents the phenomenon of

quantum reflection using the available data. We use the Abel equation to invert

the data. The resulting invisible quantum barrier is double-valued in both

axes. We study this invisible barrier in the case of atom and Bose-Einstein

Condensate reflection from a solid silicon surface. A time-dependent,

one-spatial dimension Gross-Pitaevskii equation is solved for the BEC case. We

found that the BEC behaves very similarly to the single atom except for size

effects, which manifest themselves in a maximum in the reflectivity at small

distances from the wall. The effect of the atom-atom interaction on the BEC

reflection and correspondingly on the invisible barrier is found to be

appreciable at low velocities and comparable to the finite size effect. The

trapping of ultracold atom or BEC between two walls is discussed.

\\ ( http://arxiv.org/abs/0804.3022 , 138kb)

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arXiv:0804.3026

Date: Fri, 18 Apr 2008 14:28:10 GMT (125kb)

Title: Quantum Dynamics in the Thermodynamic Limit

Authors: Jasper van Wezel

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

Comments: 13 pages, 4 figures

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

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The description of spontaneous symmetry breaking that underlies the

connection between classically ordered objects in the thermodynamic limit and

their individual quantum mechanical building blocks is one of the cornerstones

of modern condensed matter theory and has found applications in many different

areas of physics. The theory of spontaneous symmetry breaking however, is

inherently an equilibrium theory, which does not address the dynamics of

quantum systems in the thermodynamic limit. Here, we will use the example of a

particular antiferromagnetic model system to show that the presence of a

so-called thin spectrum of collective excitations with vanishing energy -one of

the well-known characteristic properties shared by all symmetry-breaking

objects- can allow these objects to also spontaneously break time-translation

symmetry in the thermodynamic limit. As a result, that limit is found to be

able, not only to reduce quantum mechanical equilibrium averages to their

classical counterparts, but also to turn individual-state quantum dynamics into

classical physics. In the process, we find that the dynamical description of

spontaneous symmetry breaking can also be used to shed some light on the

possible origins of Born's rule. We conclude by describing an experiment on a

condensate of exciton polaritons which could potentially be used to

experimentally test the proposed mechanism.

\\ ( http://arxiv.org/abs/0804.3026 , 125kb)

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arXiv:0804.3040

Date: Fri, 18 Apr 2008 15:28:55 GMT (11kb)

Title: Effect of anisotropic hopping on the Bose Hubbard model phase diagram:

strong-coupling perturbation theory on a square lattice

Authors: J. K. Freericks (Georgetown University)

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

Comments: (5 pages, 1 figure, RevTeX)

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

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There has been a recent resurgence of experimental efforts to quantitatively

determine the phase diagram of the Bose Hubbard model by carefully analyzing

experiments with ultracold bosonic atoms on an optical lattice. In many

realizations of these experiments, the hopping amplitudes are not homogeneous

throughout the lattice, but instead, the lattice has an anisotropy where

hopping along one direction is not exactly equal to hopping along a

perpendicular direction. In this contribution, we examine how an anisotropy in

the hopping matrix elements affects the Mott lobes of the Bose Hubbard model.

For weak anisotropy, we find the phase diagram is only slightly modified when

expressed in terms of the average hopping, while for strong anisotropy, one

expects to ultimately see dimensional crossover effects.

\\ ( http://arxiv.org/abs/0804.3040 , 11kb)

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arXiv:0804.3086

Date: Fri, 18 Apr 2008 19:20:35 GMT (38kb,D)

Title: Teaching superfluidity at the introductory level

Authors: Alexander J.M. Schmets and Wouter Montfrooij

Categories: cond-mat.supr-con physics.ed-ph quant-ph

Comments: This paper was written to compensate for the lack of any useful

treatment of superfluidity in standard (introduction) modern physics

textbooks. The paper contains some interesting estimates that might be of

interest to people involved in superfluid research

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

\\

Standard introductory modern physics textbooks do not exactly dwell on

superfluidity in 4He. Typically, Bose-Einstein condensation (BEC) is mentioned

in the context of an ideal Bose gas, followed by the statement that BEC happens

in 4He and that the ground state of 4He exhibits many interesting properties

such as having zero viscosity. Not only does this approach not explain in any

way why 4He becomes a superfluid, it denies students the opportunity to learn

about the far reaching consequences of energy gaps as they develop in both

superfluids and superconductors. We revisit superfluid 4He by starting with

Feynman's explanation of superfluidity based on Bose statistics as opposed to

BEC, and we present exercises for the students that allow them to arrive at a

very accurate estimate of the superfluid transition temperature and of the

energy gap separating the ground state from the first excited state. This paper

represents a self-contained account of superfluidity, which can be covered in

one or two lessons in class.

\\ ( http://arxiv.org/abs/0804.3086 , 38kb)

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arXiv:0804.2920

Date: Thu, 17 Apr 2008 23:28:03 GMT (674kb,D)

Title: Quantum control of the hyperfine-coupled electron and nuclear spins in

alkali atoms

Authors: Seth T. Merkel. Poul S. Jessen, Ivan H. Deutsch

Categories: quant-ph

Comments: 14 pages, 7 figures

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

\\

We study quantum control of the full hyperfine manifold in the

ground-electronic state of alkali atoms based on applied radio frequency and

microwave fields. Such interactions should allow essentially decoherence-free

dynamics and the application of techniques for robust control developed for NMR

spectroscopy. We establish the conditions under which the system is

controllable in the sense that one can generate an arbitrary unitary on the

system. We apply this to the case of $^{133}$Cs with its $d=16$ dimensional

Hilbert space of magnetic sublevels in the $6S_{1/2}$ state, and design control

waveforms that generate an arbitrary target state from an initial fiducial

state. We develop a generalized Wigner function representation for this space

consisting of the direct sum of two irreducible representation of SU(2),

allowing us to visualize these states. The performance of different control

scenarios is evaluated based on the ability to generate high-fidelity operation

in an allotted time with the available resources. We find good operating points

commensurate with modest laboratory requirements.

\\ ( http://arxiv.org/abs/0804.2920 , 674kb)

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arXiv:0804.3005

Date: Fri, 18 Apr 2008 12:02:59 GMT (73kb,D)

Title: Quantum Interface for Nanomechanics and Atomic Ensembles

Authors: K. Hammerer, M.Aspelmeyer, E.S. Polzik, P. Zoller

Categories: quant-ph

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

\\

We suggest to interface atomic ensembles, for which means of high precision

state preparation, manipulation and measurement are available, via an optical

quantum bus to nanomechanical systems. This allows for a Quantum Non-Demolition

Bell measurement, projecting the coupled system atomic ensemble -

nanomechanical resonator into an entangled state. The entanglement is

observable even for nanoresonators initially well above their ground states and

can be utilized for teleportation of states from an atomic ensemble to the

mechanical system. Because of the rich toolbox already available for these

systems, we expect the interface to give rise to a variety of new quantum

protocols.

\\ ( http://arxiv.org/abs/0804.3005 , 73kb)

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arXiv:0804.3006

Date: Fri, 18 Apr 2008 12:36:38 GMT (129kb)

Title: Theory of near-field matter wave interference beyond the eikonal

approximation

Authors: Stefan Nimmrichter, Klaus Hornberger

Categories: quant-ph

Comments: 19 pages, 10 figures

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

\\

A generalized description of Talbot-Lau interference with matter waves is

presented, which accounts for arbitrary grating interactions and realistic beam

characteristics. The dispersion interaction between the beam particles and the

optical elements strongly influences the interference pattern in this

near-field effect, and it is known to dominate the fringe visibility if

increasingly massive and complex particles are used. We provide a general

description of the grating interaction process by combining semiclassical

scattering theory with a phase space formulation. It serves to systematically

improve the eikonal approximation used so far, and to assess its regime of

validity.

\\ ( http://arxiv.org/abs/0804.3006 , 129kb)

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arXiv:0804.2949

Date: Fri, 18 Apr 2008 07:10:58 GMT (122kb)

Title: Potassium ground state scattering parameters and Born-Oppenheimer

potentials from molecular spectroscopy

Authors: Stephan Falke, Horst Knoeckel, Jan Friebe, Matthias Riedmann, Eberhard

Tiemann, Christian Lisdat

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

Comments: 14 pages, 4 figures, 8 tables

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

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We present precision measurements with MHz uncertainty of the energy gap

between asymptotic and well bound levels in the electronic ground state X

$^1\Sigma_{\mathrm{g}}^+$ of the $^{39}$K$_2$ molecule. The molecules are

prepared in a highly collimated particle beam and are interrogated in a

$\Lambda$-type excitation scheme of optical transitions to long range levels

close to the asymptote of the ground state, using the electronically excited

state A $^1\Sigma^+_{\rm u}$ as intermediate one. The transition frequencies

are measured either by comparison with I$_2$ lines or by absolute measurements

using a fs-frequency comb. The determined level energies were used together

with Feshbach resonances from cold collisions of $^{39}$K and $^{40}$K reported

from other authors to fit new ground state potentials. Precise scattering

lengths are determined and tests of the validity of the Born-Oppenheimer

approximation for the description of cold collisions at this level of precision

are performed.

\\ ( http://arxiv.org/abs/0804.2949 , 122kb)

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arXiv:0804.3011

Date: Fri, 18 Apr 2008 13:21:39 GMT (77kb,D)

Title: Cross-Molecular Coupling in Combined Photoassociation and Feshbach

Resonances

Authors: Matt Mackie, Matthew Fenty, Danielle Savage, and Jake Kesselman

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

Comments: 4 pages, 2 figs, 22+ refs

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

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We examine combined photoassociation and Feshbach resonances in a

Bose-Einstein condensate, focusing on the case where only one field, magnetic

or laser, is off-resonant. For off-resonant magnetic fields, the position of

laser resonance is dispersively shifted with magnetic field, blue below the

Feshbach resonance, while atom losses to photoassociation cease at a specific

magnetic field and saturate at the limit for magnetoassociation alone. For

off-resonant lasers, a similar shift occurs in the position of magnetic-field

resonance, and a node occurs in Feshbach losses at a particular laser detuning;

however, in contrast to the photoassociation node, the position of the Feshbach

node depends on intensity. Cross coupling between the photoassociation and

Feshbach molecules, and associated quantum interference, is implicated as the

physical mechanism responsible for this behavior. Off-Feshbach-resonant results

agree reasonably with recent observations.

\\ ( http://arxiv.org/abs/0804.3011 , 77kb)

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arXiv:0804.3280

Date: Mon, 21 Apr 2008 11:45:50 GMT (66kb)

Title: Interband physics in an ultra-cold Fermi gas in an optical lattice

Authors: J.-P. Martikainen, E. Lundh, and T. Paananen

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

Comments: 4 pages, 2 figures

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

\\

We study a gas of strongly polarized cold fermions in an optical lattice when

the excited p-bands are populated. We derive the relevant Hamiltonian and

discuss the expected phase diagram for both repulsive and attractive

interactions. In the parameter regime covered here, checkerboard

anti-ferromagnetic ordering is found to be possible for repulsive interactions

while for attractive interactions, transitions between different types of

paired phases are predicted.

\\ ( http://arxiv.org/abs/0804.3280 , 66kb)

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arXiv:0804.3287

Date: Mon, 21 Apr 2008 12:25:48 GMT (647kb,D)

Title: Double barrier potentials for matter-wave gap solitons

Authors: V. Ahufinger, B. A. Malomed, G. Birkl, R. Corbalan and A. Sanpera

Categories: cond-mat.other

Comments: 5 pages, 4 figures

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

\\

We investigate collisions of solitons of the gap type, supported by a lattice

potential in repulsive Bose-Einstein condensates, with an effective

double-barrier potential that resembles a Fabry-Perot cavity. We identify

conditions under which the trapping of the entire incident soliton in the

cavity is possible. Collisions of the incident soliton with an earlier trapped

one are considered too. In the latter case, many outcomes of the collisions are

identified, including merging, release of the trapped soliton with or without

being replaced by the incoming one, and trapping of both solitons.

\\ ( http://arxiv.org/abs/0804.3287 , 647kb)

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arXiv:0804.3364

Date: Mon, 21 Apr 2008 19:05:26 GMT (43kb)

Title: A Unitary Fermi Supersolid: The Larkin-Ovchinnikov Phase

Authors: Aurel Bulgac and Michael McNeil Forbes

Categories: cond-mat.supr-con

Comments: 4 pages, 3 figures, RevTeX4

Report-no: NG-0809

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

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We present strong theoretical evidence that a Larkin-Ovchinnikov (LOFF/FFLO)

pairing phase is favoured over the homogeneous superfluid and normal phases in

three-dimensional unitary Fermi systems. Using a density functional theory

(DFT) based on the latest quantum Monte-Carlo calculations and experimental

results, we show that this phase is competitive over a large region of the

phase diagram. The oscillations in the number densities and pairing field have

a substantial amplitude, and a period some three to ten times the average

interparticle separation. Within the DFT, the transition to a normal polarized

Fermi liquid at large polarizations is smooth, while the transition to a

fully-paired superfluid is abrupt.

\\ ( http://arxiv.org/abs/0804.3364 , 43kb)

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arXiv:0804.3372

Date: Mon, 21 Apr 2008 17:37:39 GMT (231kb,D)

Title: Counting atoms using interaction blockade in an optical superlattice

Authors: P. Cheinet, S. Trotzky, M. Feld, U. Schnorrberger, M. Moreno-Cardoner,

S. Foelling, I. Bloch

Categories: cond-mat.other

Comments: 4 pages, 4 figures

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

\\

We report on the observation of an interaction blockade effect for ultracold

atoms in optical lattices, analogous to Coulomb blockade observed in mesoscopic

solid state systems. When the lattice sites are converted into biased double

wells, we detect a discrete set of steps in the well population for increasing

bias potentials. These correspond to tunneling resonances where the atom number

on each side of the barrier changes one by one. This allows us to count and

control the number of atoms within a given well. By evaluating the amplitude of

the different plateaus, we can fully determine the number distribution of the

atoms in the lattice, which we demonstrate for the case of a superfluid and

Mott insulating regime of 87Rb.

\\ ( http://arxiv.org/abs/0804.3372 , 231kb)

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arXiv:0804.3257

Date: Mon, 21 Apr 2008 09:56:58 GMT (65kb)

Title: Spatial entanglement of paired photons generated in cold atomic

ensembles

Authors: Clara I. Osorio, Sergio Barreiro, Morgan W. Mitchell and Juan P.

Torres

Categories: quant-ph

Comments: 5 pages, 3 figures, Submitted to Phys. Rev. A

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

\\

Cold atomic ensembles can mediate the generation of entanglement between

pairs of photons. Photons with specific directions of propagation are detected,

and the entanglement can reside in any of the degrees of freedom that describe

the whole quantum state of the photons: polarization, spatial shape or

frequency. We show that the direction of propagation of the generated photons

determines the spatial quantum state of the photons and therefore, the amount

of entanglement generated. When photons generated in different directions are

combined, this spatial distinguishing information can degrade the quantum

purity of the polarization or frequency entanglement.

\\ ( http://arxiv.org/abs/0804.3257 , 65kb)

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arXiv:0804.3273

Date: Mon, 21 Apr 2008 11:24:10 GMT (494kb,D)

Title: Giant electro-optic effect using polarizable dark states

Authors: A. K. Mohapatra, M. G. Bason, B. Butscher, K. J. Weatherill, and C. S.

Adams

Categories: quant-ph

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

\\

The electro-optic effect, where the refractive index of a medium is modified

by an electric field, is of central importance in non-linear optics, laser

technology, quantum optics and optical communications. In general,

electro-optic coefficients are very weak and a medium with a giant

electro-optic coefficient would have profound implications for non-linear

optics, especially at the single photon level, enabling single photon

entanglement and switching. Here we propose and demonstrate a giant

electro-optic effect based on polarizable dark states. We demonstrate phase

modulation of the light field in the dark state medium and measure an

electro-optic coefficient that is more than 12 orders of magnitude larger than

in other gases. This enormous Kerr non-linearity also creates the potential for

precision electrometry and photon entanglement.

\\ ( http://arxiv.org/abs/0804.3273 , 494kb)

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arXiv:0804.3424

Date: Mon, 21 Apr 2008 23:57:28 GMT (331kb,D)

Title: Dynamics of matter-wave solitons in a time-modulated two-dimensional

optical lattice

Authors: Gennadiy Burlak, Boris A. Malomed

Categories: cond-mat.other

Comments: 22 pages, 9 figures

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

\\

By means of the variational approximation (VA) and systematic simulations, we

study dynamics and stability boundaries for solitons in a two-dimensional (2D)

self-attracting Bose-Einstein condensate (BEC), trapped in an optical lattice

(OL) whose amplitude is subjected to the periodic time modulation (the

modulation frequency, $\omega $, may be in the range of several KHz). Regions

of stability of the solitons against the collapse and decay are identified in

the space of the model's parameters. A noteworthy result is that the stability

limit may reach the largest (100%) modulation depth, and the collapse threshold

may exceed its classical value in the static lattice (which corresponds to the

norm of Townes soliton). Minimum norm $% N_{\min}$ necessary for the stability

of the solitons is identified too. It features a strong dependence on $\omega $

at a low frequencies, due to a resonant decay of the soliton. Predictions of

the VA are reasonably close to results of the simulations. In particular, the

VA helps to understand salient resonant features in the shape of the stability

boundaries observed with the variation of $\omega $.

\\ ( http://arxiv.org/abs/0804.3424 , 331kb)

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arXiv:0804.3429

Date: Tue, 22 Apr 2008 01:21:58 GMT (23kb)

Title: Quantum phases and phase transitions of interacting bosons in a Kagome

lattice

Authors: Jinwu Ye

Categories: cond-mat.str-el

Comments: 4+ pages, 3 figures, REVTEX4. This is a short version of

cond-mat/0612009 which is under a substantial expansion

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

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By using a self-consistent dual vortex method and analyzing the saddle point

structures of the dual gauge fields carefully in the insulating side, we study

quantum phases, especially supersolid phases and phase transitions in an

extended boson Hubbard model at and slightly away from $ 1/3 $ ($ 2/3 $)

filling on a kagome lattice. We find phases and phase transitions in Kagome

lattice is dramatically different from those in bipartite and triangular

lattices in both Ising and Easy-plane limit. Slightly away from $ f=1/3 (2/3)

$, there is no supersolid in the Ising limit, but there are always supersolids

in the Easy-plane limit where we find a stripe solid and a new type of

supersolid which has charge density wave-valence bond-superfluid order and also

analyze their corresponding stability conditions. The results achieved resolve

some outstanding puzzles observed in recent QMC in a kagome lattice.

Implications on QMC simulations with both nearest neighbor and next nearest

neighbor interactions are given.

\\ ( http://arxiv.org/abs/0804.3429 , 23kb)

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arXiv:0804.3514

Date: Tue, 22 Apr 2008 12:25:47 GMT (152kb)

Title: Time reversal of Bose-Einstein condensates

Authors: J. Martin, B. Georgeot and D. L. Shepelyansky

Categories: cond-mat.stat-mech

Comments: 4 pages, 5 figures, research done at

http://www.quantware.ups-tlse.fr/

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

\\

Using Gross-Pitaevskii equation, we study the time reversibility of

Bose-Einstein condensates (BEC) in kicked optical lattices, showing that inside

the regime of quantum chaos the dynamics can be inverted from explosion to

collapse. The accuracy of time reversal decreases with the increase of atom

interactions inside BEC, until it is completely lost. Surprisingly, quantum

chaos helps to restore time reversibility. These predictions can be tested with

existing experimental setups.

\\ ( http://arxiv.org/abs/0804.3514 , 152kb)

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arXiv:0804.3523

Date: Tue, 22 Apr 2008 14:24:13 GMT (304kb)

Title: Dynamics of saturated Bragg diffraction in a stored light grating in

cold atoms

Authors: D. Moretti, N. Gonzalez, D. Felinto, and J. W. R. Tabosa

Categories: quant-ph

Comments: Submitted to Phys. Rev. A

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

\\

We report on a detailed investigation of the dynamics and the saturation of a

light grating stored in a sample of cold cesium atoms. We employ Bragg

diffraction to retrieve the stored optical information impressed into the

atomic coherence by the incident light fields. The diffracted efficiency is

studied as a function of the intensities of both writing and reading laser

beams. A theoretical model is developed to predict the temporal pulse shape of

the retrieved signal and compares reasonably well with the observed results.

\\ ( http://arxiv.org/abs/0804.3523 , 304kb)

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arXiv:0804.3609

Date: Tue, 22 Apr 2008 21:05:48 GMT (45kb,D)

Title: Josephson physics mediated by the Mott insulating phase

Authors: Smitha Vishveshwara and Courtney Lannert

Categories: cond-mat.mes-hall cond-mat.dis-nn

Comments: 4 pages, 1 figure

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

\\

We investigate the static and dynamic properties of bosonic lattice systems

in which condensed and Mott insulating phases co-exist due to the presence of a

spatially-varying potential. We formulate a description of these inhomogeneous

systems and calculate the bulk energy at and near equilibrium. We derive the

explicit form of the Josephson coupling between disjoint superfluid regions

separated by Mott insulating regions. We obtain detailed estimates for the

experimentally-realized case of alternating superfluid and Mott insulating

spherical shells in a radially symmetric parabolically-confined cold atom

system.

\\ ( http://arxiv.org/abs/0804.3609 , 45kb)

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arXiv:0804.3674

Date: Wed, 23 Apr 2008 10:01:47 GMT (11kb)

Title: Entanglement production with Bose atoms in optical lattices

Authors: V.I. Yukalov and E.P. Yukalova

Categories: cond-mat.other

Comments: Latex file, 14 pages

Journal-ref: J. Phys. Conf. Ser. 104 (2008) 012003

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

\\

A method of entanglement production is suggested, based on the resonant

generation of topological modes in systems with Bose-Einstein condensates

trapped in optical or magnetic lattices. The method makes it possible to

regulate the strength of entanglement production as well as to govern its time

variation. This method can serve as a practical tool for quantum information

processing and quantum computing.

\\ ( http://arxiv.org/abs/0804.3674 , 11kb)

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arXiv:0804.3705

Date: Wed, 23 Apr 2008 12:57:02 GMT (261kb)

Title: Quantum phase transition and critical fluctuations of an attractive Bose

gas in a double well potential

Authors: P. Zi\'n, J. Chwede\'nczuk, B. Ole\'s, K. Sacha and M. Trippenbach

Categories: cond-mat.other

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

\\

We consider a Bose gas with an attractive interaction in a symmetric double

well potential. In the Hartree approximation, the ground state solution

spontaneously breaks the symmetry of the trapping potential above certain value

of the interaction strength. We demonstrate how the Landau-Ginzburg scheme of

the second order phase transition emerges from the quantum model and show its

link to the spontaneous symmetry breaking mentioned above. We identify the

order parameter, the critical point and analyze quantum fluctuations around it.

\\ ( http://arxiv.org/abs/0804.3705 , 261kb)

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\\

arXiv:0804.3723

Date: Wed, 23 Apr 2008 14:38:12 GMT (91kb,D)

Title: Coherent backscattering of Bose-Einstein condensates in two-dimensional

disorder potentials

Authors: Michael Hartung, Thomas Wellens, Cord A. Mueller, Klaus Richter, Peter

Schlagheck

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

Comments: 4 pages, 4 figures

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

\\

We study quantum transport of an interacting Bose-Einstein condensate in a

two-dimensional disorder potential. In the limit of vanishing atom-atom

interaction, a sharp cone in the angle-resolved density of the scattered matter

wave is observed, arising from constructive interference between amplitudes

propagating along reversed scattering paths. Weak interaction transforms this

coherent backscattering peak into a pronounced dip, indicating destructive

instead of constructive interference. We reproduce this result, obtained from

the numerical integration of the Gross-Pitaevskii equation, by a diagrammatic

theory of weak localization in presence of a nonlinearity.

\\ ( http://arxiv.org/abs/0804.3723 , 91kb)

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arXiv:0804.2919 (*cross-listing*)

Date: Thu, 17 Apr 2008 23:25:47 GMT (13kb)

Title: Low energy density correlation function of the degenerate unitary Fermi

gas from epsilon expansion

Authors: Andrei Kryjevski

Categories: nucl-th cond-mat.other

Comments: 10 pages, 1 figure

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

\\

Using $\epsilon$ expansion proposed in \cite{Nishida:2006br} we calculate

density correlation function of the degenerate Fermi gas at infinite scattering

length to next-to-leading order in $\epsilon$ for excitation energies below

quasi particle threshold. An expression for the low energy dynamic structure

function is derived.

\\ ( http://arxiv.org/abs/0804.2919 , 13kb)

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\\

arXiv:0804.3501 (*cross-listing*)

Date: Tue, 22 Apr 2008 14:46:19 GMT (793kb)

Title: Lattice simulations for few- and many-body systems

Authors: Dean Lee (North Carolina State University)

Categories: nucl-th cond-mat.other hep-lat

Comments: 64 pages, 21 figures

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

\\

We review the recent literature on lattice simulations for few- and many-body

systems. We focus on methods and results that combine the framework of

effective field theory with computational lattice methods. Lattice effective

field theory is discussed for cold atoms as well as low-energy nucleons with

and without pions. A number of different lattice formulations and computational

algorithms are considered, and an effort is made to show common themes in

studies of cold atoms and low-energy nuclear physics as well as common themes

in work by different collaborations.

\\ ( http://arxiv.org/abs/0804.3501 , 793kb)

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\\

arXiv:0804.3842

Date: Thu, 24 Apr 2008 05:44:03 GMT (352kb)

Title: Rosen-Zener interferometry with Ultracold Atoms

Authors: Li-Bin Fu, Di-Fa Ye, Chaohong Lee, Weiping Zhang, and Jie Liu

Categories: cond-mat.mes-hall

Comments: 4 pages, 5 figures

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

\\

We propose a time-domain "interferometer" based on ultracold Bose atoms

loaded on a double well potential. By the adiabatic Rosen-Zener process, the

barrier between two wells is ramped down slowly, held for a while, then ramped

back. Starting with a coherent state of double well system, the final

occupations on one well show interesting interference fringes in the

time-domain. The fringe pattern is sensitive to the initial state and can be

controlled by the hold time. This interferometric scheme provides new

possibilities for precision measurements with ultracold atoms. The underlying

mechanism is revealed and possible applications are discussed.

\\ ( http://arxiv.org/abs/0804.3842 , 352kb)

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\\

arXiv:0804.3977

Date: Thu, 24 Apr 2008 18:02:01 GMT (284kb)

Title: Incommensurate superfluidity of bosons in a double-well optical lattice

Authors: Vladimir M. Stojanovic, Congjun Wu, W. Vincent Liu, S. Das Sarma

Categories: cond-mat.other

Comments: 4 pages, 5 figures

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

\\

We study cold bosons in the first excited Bloch band of a double-well optical

lattice, recently realized at NIST. By calculating parameters of the

Bose-Hubbard model from a realistic nonseparable lattice potential, we find

that in the most favorable cases the boson lifetime in the first excited band

can be several orders of magnitude longer than the typical nearest-neighbor

tunnelling timescales, in contrast to that of a simple single-well lattice. In

addition, for sufficiently small lattice depths the excited band has minima at

nonzero momenta incommensurate with the lattice period, which opens a

possibility to realize an exotic superfluid state that spontaneously breaks the

time-reversal, rotational, and translational symmetries. We discuss possible

experimental signatures of this novel state.

\\ ( http://arxiv.org/abs/0804.3977 , 284kb)

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\\

arXiv:0804.3994

Date: Thu, 24 Apr 2008 19:27:18 GMT (68kb)

Title: Renormalization group flow for fermionic superfluids at zero temperature

Authors: P. Strack, R. Gersch, W. Metzner

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

Comments: 14 pages, 12 Figures, submitted to Phys. Rev. B

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

\\

We present a comprehensive analysis of quantum fluctuation effects in the

superfluid ground state of an attractively interacting Fermi system, employing

the attractive Hubbard model as a prototype. The superfluid order parameter,

and fluctuations thereof, are implemented by a bosonic Hubbard-Stratonovich

field, which splits into two components corresponding to longitudinal and

transverse (Goldstone) fluctuations. Physical properties of the system are

computed from a set of approximate flow equations obtained by truncating the

exact functional renormalization group flow of the coupled fermion-boson

action. The equations capture the influence of fluctuations on non-universal

quantities such as the fermionic gap, as well as the universal infrared

asymptotics present in every fermionic superfluid. We solve the flow equations

numerically in two dimensions and compute the asymptotic behavior analytically

in two and three dimensions. The fermionic gap \Delta is reduced significantly

compared to the mean-field gap, and the bosonic order parameter \alpha, which

is equivalent to \Delta in mean-field theory, is suppressed to values below

\Delta by fluctuations. The fermion-boson vertex is only slightly renormalized.

In the infrared regime, transverse order parameter fluctuations associated with

the Goldstone mode lead to a strong renormalization of longitudinal

fluctuations: the longitudinal mass and the bosonic self-interaction vanish

linearly as a function of the scale in two dimensions, and logarithmically in

three dimensions, in agreement with the exact behavior of an interacting Bose

gas.

\\ ( http://arxiv.org/abs/0804.3994 , 68kb)

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\\

arXiv:0804.3976

Date: Thu, 24 Apr 2008 17:54:53 GMT (13kb)

Title: Matrix product operator representations

Authors: V. Murg, J.I. Cirac, B. Pirvu, F. Verstraete

Categories: quant-ph

Comments: comment welcome

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

\\

We show how to construct relevant families of matrix product operators in one

and higher dimensions. Those form the building blocks for the numerical

simulation methods based on matrix product states and projected entangled pair

states. In particular, we construct translational invariant matrix product

operators suitable for time evolution, and show how such descriptions are

possible for Hamiltonians with long-range interactions. We illustrate how those

tools can be exploited for constructing new algorithms for simulating quantum

spin systems.

\\ ( http://arxiv.org/abs/0804.3976 , 13kb)

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\\

arXiv:0804.3981

Date: Thu, 24 Apr 2008 18:33:06 GMT (217kb)

Title: Narrow-Band Biphoton Generation near Atomic Resonance

Authors: Shengwang Du, Jianming Wen, and Morton H. Rubin

Categories: quant-ph

Comments: 12 pages, 4 figures, a review on narrow-band paired photons generated

from an atomic-gase medium near resonance, submitted to JOSA B (2008)

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

\\

Generating nonclassical light offers a benchmark tool for the fundamental

research and potential applications in quantum optics. Conventionally, it has

become a standard technique to produce the nonclassical light through the

nonlinear optical processes occurring in nonlinear crystals. In this review we

describe using cold atomic-gas media to generate such nonclassical light,

especially focusing on narrow-band biphoton generation. Compared with the

standard procedure, the new biphoton source has such properties as long

coherence time, long coherence length, high spectral brightness, and high

conversion efficiency. In this paper we concentrate on the theoretical aspect

of the entangled two-photon state produced from the four-wave mixing in a

multilevel atomic ensemble. We show that both linear and nonlinear optical

responses to the generated fields play an important role in determining the

biphoton waveform and, consequently on the two-photon temporal correlation.

There are two characteristic regimes determined by whether the linear or

nonlinear coherence time is dominant. In addition, our model provides a clear

physical picture that brings insight into understanding biphoton optics with

this new source. We apply our model to recent work on generating narrow-band

(and even subnatural linewidth) paired photons using the technique of

electromagnetically induced transparency and slow-light effect in cold atoms,

and find good agreements with experimental results.

\\ ( http://arxiv.org/abs/0804.3981 , 217kb)

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and just because they caught my eye:

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\\

arXiv:0804.3054

Date: Fri, 18 Apr 2008 15:52:31 GMT (106kb)

Title: Gravitation as a Casimir interaction

Authors: Bo E. Sernelius

Categories: quant-ph

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

\\

Gravitation is considered to be one of the four fundamental interactions in

nature. However, one has so far failed to observe the graviton, the quantum

particle that is believed to transmit the gravitational force at a distance -

the analogue to the photon in electromagnetism. Maybe it is now time to

re-evaluate the status of the gravitation as a fundamental interaction. Here,

we propose a completely new interpretation of gravitation. In this description

the gravitational force is no longer a fundamental force. It is an induced

force, a dispersion force, and the analogue to the Casimir force in

electromagnetism. The fundamental force is in our description a force between

particles with a parabolic interaction potential. In our model the nucleons are

made up from these particles. We find the retarded dispersion force between

these composite particles has the correct distance dependence, 1/r. If this

interpretation is correct it has a broad range of implications. Our view on the

fundamental concept mass is altered; our view on the expansion of the Universe

may change.

\\ ( http://arxiv.org/abs/0804.3054 , 106kb)

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\\

arXiv:0804.3076

Date: Fri, 18 Apr 2008 17:59:35 GMT (217kb)

Title: Operator Imprecision and Scaling of Shor's Algorithm

Authors: C. Ray Hill and George F. Viamontes

Categories: quant-ph

Comments: 15 pages

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

\\

Shor's algorithm (SA) is a quantum algorithm for factoring integers. Since SA

has polynomial complexity while the best classical factoring algorithms are

sub-exponential, SA is cited as evidence that quantum computers are more

powerful than classical computers. SA is critically dependent on the Quantum

Fourier Transform (QFT) and it is known that the QFT is sensitive to errors in

the quantum state input to it. In this paper, we show that the polynomial

scaling of SA is destroyed by input errors to the QFT part of the algorithm. We

also show that Quantum Error Correcting Codes (QECC) are not capable of

suppressing errors due to operator imprecision and that propagation of operator

precision errors is sufficient to severely degrade the effectiveness of SA.

Additionally we show that operator imprecision in the error correction circuit

for the Calderbank-Shor-Steane QECC is mathematically equivalent to decoherence

on every physical qubit in a register. We conclude that, because of the effect

of operator precision errors, it is likely that physically realizable quantum

computers will be capable of factoring integers no more efficiently than

classical computers.

\\ ( http://arxiv.org/abs/0804.3076 , 217kb)

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The replacements:

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\\

arXiv:0709.2094

replaced with revised version Fri, 18 Apr 2008 16:52:55 GMT (162kb,D)

Title: Quantum Spin Dynamics of Mode-Squeezed Luttinger Liquids in

Two-Component Atomic Gases

Authors: Artur Widera, Stefan Trotzky, Patrick Cheinet, Simon F\"olling,

Fabrice Gerbier, Immanuel Bloch, Vladimir Gritsev, Mikhail D. Lukin and

Eugene Demler

Categories: cond-mat.other

Comments: 4 pages, 3 figures Updated version, minor changes

Journal-ref: Phys. Rev. Lett. 100, 140401 (2008)

DOI: 10.1103/PhysRevLett.100.140401

\\ ( http://arxiv.org/abs/0709.2094 , 162kb)

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\\

arXiv:0804.0971

replaced with revised version Fri, 18 Apr 2008 11:38:53 GMT (33kb)

Title: Fast rotating condensates in an asymmetric harmonic trap

Authors: Amandine Aftalion (LJLL), Xavier Blanc (LJLL), Nicolas Lerner (IMJ)

Categories: cond-mat.other

Comments: 4 pages, 2 figures

Proxy: ccsd hal-00270540

\\ ( http://arxiv.org/abs/0804.0971 , 33kb)

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\\

arXiv:0804.2223

replaced with revised version Fri, 18 Apr 2008 17:59:21 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, to appear in Physical Review A

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

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

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\\

arXiv:0709.2924

replaced with revised version Wed, 16 Apr 2008 01:06:17 GMT (49kb)

Title: Feshbach resonances in ultracold ^{6,7}Li + ^{23}Na atomic mixtures

Authors: Marko Gacesa, Philippe Pellegrini, and Robin C\^ot\'e

Categories: physics.atom-ph

Comments: 4 pages, 2 figures

\\ ( http://arxiv.org/abs/0709.2924 , 49kb)

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\\

arXiv:0803.2156

replaced with revised version Mon, 21 Apr 2008 17:30:26 GMT (315kb)

Title: Interaction induced trapping and pulsed emission of a magnetically

insensitive Bose-Einstein Condensate

Authors: Stephan Middelkamp, Igor Lesanovsky, Peter Schmelcher

Categories: cond-mat.other

Comments: 4 pages, 4 figures

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

\\ ( http://arxiv.org/abs/0803.2156 , 315kb)

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\\

arXiv:0709.2849

replaced with revised version Sat, 19 Apr 2008 17:16:54 GMT (301kb)

Title: Trapped Rydberg Ions: From Spin Chains to Fast Quantum Gates

Authors: M. Mueller, L.-M. Liang, I. Lesanovsky and P. Zoller

Categories: quant-ph physics.atom-ph

Comments: 26 pages, 9 figures

\\ ( http://arxiv.org/abs/0709.2849 , 301kb)

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\\

arXiv:0712.1007

replaced with revised version Tue, 22 Apr 2008 19:10:16 GMT (123kb,D)

Title: Final-state effects in the radio frequency spectrum of strongly

interacting fermions

Authors: Sourish Basu, Erich J. Mueller

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

Comments: 4 pages, 4 figures

\\ ( http://arxiv.org/abs/0712.1007 , 123kb)

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\\

arXiv:0801.1015

replaced with revised version Tue, 22 Apr 2008 09:20:31 GMT (317kb)

Title: Noise correlations of the ultra-cold Fermi gas in an optical lattice

Authors: T. Paananen, T. K. Koponen, P. T\"orm\"a, and J. -P. Martikainen

Categories: cond-mat.other

Comments: 25 pages, 11 figures. Some figures are updated and text has been

modified

\\ ( http://arxiv.org/abs/0801.1015 , 317kb)

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\\

arXiv:0802.2573

replaced with revised version Tue, 22 Apr 2008 12:35:20 GMT (372kb)

Title: Mean-field dynamics of a Bose Josephson junction in an optical cavity

Authors: J. M. Zhang, W. M. Liu, and D. L. Zhou

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

Comments: revised according to the comments of the referee

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

\\ ( http://arxiv.org/abs/0802.2573 , 372kb)

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\\

arXiv:0804.3005

replaced with revised version Tue, 22 Apr 2008 13:49:48 GMT (60kb)

Title: Quantum Interface for Nanomechanics and Atomic Ensembles

Authors: K. Hammerer, M. Aspelmeyer, E.S. Polzik, P. Zoller

Categories: quant-ph

Comments: 4 pages, 1 figure; references added, shortened text, corrected for

typos

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

\\ ( http://arxiv.org/abs/0804.3005 , 60kb)

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arXiv:0801.4579

replaced with revised version Wed, 23 Apr 2008 08:47:21 GMT (13kb)

Title: The Josephson relation for the superfluid density in the BCS-BEC

crossover

Authors: Edward Taylor

Categories: cond-mat.other

Comments: Published version

Journal-ref: Phys. Rev. B 77 144521 (2008)

\\ ( http://arxiv.org/abs/0801.4579 , 13kb)

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\\

arXiv:0803.4347

replaced with revised version Wed, 23 Apr 2008 00:36:30 GMT (287kb)

Title: Multiband-Driven Superfluid-Insulator Transition of Fermionic Atoms in

Optical Lattices: A Dynamical Mean-Field-Theory Study

Authors: Takuji Higashiyama, Kensuke Inaba, and Sei-ichiro Suga

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

Comments: 4 pages, 3 figures, Phys. Rev. A 77, 043624 (2008)

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

\\ ( http://arxiv.org/abs/0803.4347 , 287kb)

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\\

arXiv:0706.1005

replaced with revised version Tue, 22 Apr 2008 23:11:12 GMT (226kb)

Title: Observation of quantum-measurement backaction with an ultracold atomic

gas

Authors: Kater W. Murch, Kevin L. Moore, Subhadeep Gupta, and Dan M.

Stamper-Kurn

Categories: quant-ph

Comments: Article and supplementary information. Version submitted to Nature

Physics

\\ ( http://arxiv.org/abs/0706.1005 , 226kb)

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\\

arXiv:0706.2335

replaced with revised version Wed, 23 Apr 2008 02:00:16 GMT (566kb)

Title: Lateral Effects in Fermion Antibunching

Authors: K. Yuasa, P. Facchi, H. Nakazato, I. Ohba, S. Pascazio, S. Tasaki

Categories: quant-ph

Comments: 22 pages, 4 figures

Journal-ref: Phys. Rev. A 77 (2008) 043623

DOI: 10.1103/PhysRevA.77.043623

\\ ( http://arxiv.org/abs/0706.2335 , 566kb)

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\\

arXiv:0803.1887

replaced with revised version Wed, 23 Apr 2008 04:54:52 GMT (53kb)

Title: Hybrid phase-space simulation method for interacting Bose fields

Authors: Scott E. Hoffmann, Joel F. Corney and Peter D. Drummond

Categories: quant-ph

Comments: 13 pages; 6 figures; references added; figures corrected

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

\\ ( http://arxiv.org/abs/0803.1887 , 53kb)

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\\

arXiv:0801.2943

replaced with revised version Wed, 23 Apr 2008 09:30:53 GMT (962kb,D)

Title: Trapping molecules on a chip in traveling potential wells

Authors: Samuel A. Meek, Hendrick L. Bethlem, Horst Conrad, Gerard Meijer

Categories: physics.atom-ph

Comments: 4 pages, 3 figures

Journal-ref: Phys. Rev. Lett. 100, 153003 (2008)

DOI: 10.1103/PhysRevLett.100.153003

\\ ( http://arxiv.org/abs/0801.2943 , 962kb)

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\\

arXiv:0707.2378

replaced with revised version Thu, 24 Apr 2008 06:47:30 GMT (427kb)

Title: Trionic phase of ultracold fermions in an optical lattice: A variational

study

Authors: Akos Rapp, Walter Hofstetter, and Gergely Zarand

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

Comments: 14 PRB pages, 8 figures

Journal-ref: Phys. Rev. B 77, 144520 (2008)

DOI: 10.1103/PhysRevB.77.144520

\\ ( http://arxiv.org/abs/0707.2378 , 427kb)

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\\

arXiv:0706.0868

replaced with revised version Thu, 24 Apr 2008 10:33:39 GMT (339kb)

Title: Simulation of time evolution with the MERA

Authors: Matteo Rizzi, Simone Montangero, Guifre' Vidal

Categories: quant-ph cond-mat.other

Comments: final version with data improvement (precision and size), 4.1 pages,

4 figures + extra on XY

\\ ( http://arxiv.org/abs/0706.0868 , 339kb)

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Till next time,

Matt.

-- ========================================================================= Dr M. J. Davis, Senior Lecturer in Physics School of Physical Sciences, email: mdavis_at_physics.uq.edu.au University of Queensland, ph : +61 7 334 69824 Brisbane, QLD 4072, fax : +61 7 336 51242 Australia. http://www.physics.uq.edu.au/people/mdavis/ ========================================================================= Matt's arXiv selection: weekly summary of cold-atom papers from arXiv.org http://www.physics.uq.edu.au/people/mdavis/matts_arXiv/ ========================================================================= Legal stuff: Unless stated otherwise, this e-mail represents only the views of the sender and not the views of the University of Queensland =========================================================================Received on Thu May 08 2008 - 11:51:22 EST

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