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

Date: Fri, 27 Feb 2009 07:52:34 +1000

Date: Fri, 27 Feb 2009 07:52:34 +1000

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

Hello all,

There were 21 new preprints and just a single replacement.

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arXiv:0812.4575

Date: Tue, 30 Dec 2008 20:15:08 GMT (130kb)

Title: The Higgs resonance in fermionic pairing

Authors: Roman Barankov

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

Comments: 4 pages, 2 figures

\\

The Higgs boson in fermionic condensates with the BCS pairing interaction

describes the dynamics of the pairing amplitude. I show that the existence and

properties of this mode are sensitive to the energy dispersion of the

interaction. Specifically, when the pairing is suppressed at the Fermi level,

the Higgs mode may become unphysical (virtual) state or a resonance with finite

lifetime, depending on the details of interaction. Conversely, the Higgs mode

is discrete for the pairing interaction enhanced at the Fermi level. This work

illustrates conceptual difficulties associated with introducing collective

variables in the many-body pairing dynamics.

\\ ( http://arxiv.org/abs/0812.4575 , 130kb)

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arXiv:0812.4596

Date: Thu, 25 Dec 2008 09:45:22 GMT (15kb)

Title: A theory of topological edges and domain walls

Authors: F.A. Bais, J.K. Slingerland, S.M. Haaker

Categories: cond-mat.mes-hall cond-mat.str-el

Comments: 4 pages, 1 figure, latex

Report-no: ITFA 2008-52

\\

We investigate domain walls between topologically ordered phases in two

spatial dimensions and present a simple but general framework from which their

degrees of freedom can be understood. The approach we present exploits the

results on topological symmetry breaking that we have introduced and presented

elsewhere. After summarizing the method, we work out predictions for the

spectrum of edge excitations and for the transport through edges in some

representative examples. These include domain walls between the Abelian and

non-Abelian topological phases of Kitaev's honeycomb lattice model in a

magnetic field, as well as recently proposed domain walls between spin

polarized and unpolarized non-Abelian fractional quantum Hall states at

different filling fractions.

\\ ( http://arxiv.org/abs/0812.4596 , 15kb)

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arXiv:0812.4602

Date: Thu, 25 Dec 2008 12:19:14 GMT (1044kb)

Title: Atomic Quantum Corrals for Bose-Einstein Condensates

Authors: Hongwei Xiong and Biao Wu

Categories: cond-mat.other

Comments: 4 pages, 5 figures

\\

A feasible scheme is proposed to build quantum corrals for Bose-Einstein

condensates. Compared to the electronic quantum corrals, the atomic quantum

corrals have the advantage of allowing direct and convenient observation of the

wave dynamics. Our numerical study shows that this advantage not only allows

people to explore the rich dynamical structures in the density distribution but

also makes the corrals useful in many other aspects. In particular, the corrals

for atoms can be arranged into a stadium shape for the experimental

visualization of quantum chaos, which has been elusive in the electronic

quantum corrals.

\\ ( http://arxiv.org/abs/0812.4602 , 1044kb)

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arXiv:0812.4611

Date: Thu, 25 Dec 2008 15:38:09 GMT (872kb)

Title: Gap-Townes solitons and delocalizing transitions of multidimensional

Bose-Einstein condensates in optical lattices

Authors: M. Salerno, F. Kh. Abdullaev and B. B. Baizakov

Categories: cond-mat.other

Comments: 14 pages, 6 figures

\\

We show the existence of gap-Townes solitons for the multidimensional

Gross-Pitaeviskii equation with attractive interactions and in two- and

three-dimensional optical lattices. In absence of the periodic potential the

solution reduces to the known Townes solitons of the multi-dimensional

nonlinear Schr\"odinger equation, sharing with these the propriety of being

unstable against small norm (number of atoms) variations. We show that in the

presence of the optical lattice the solution separates stable localized

solutions (gap-solitons) from decaying ones, characterizing the delocalizing

transition occurring in the multidimensional case. The link between these

higher dimensional solutions and the ones of one dimensional nonlinear

Schr\"odinger equation with higher order nonlinearities is also discussed.

\\ ( http://arxiv.org/abs/0812.4611 , 872kb)

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arXiv:0812.4717

Date: Fri, 26 Dec 2008 22:19:41 GMT (959kb)

Title: Thermalization dynamics close to a quantum phase transition

Authors: Dario Patan\`e, Alessandro Silva, Fernando Sols, Luigi Amico

Categories: cond-mat.stat-mech

Comments: 4 pages, 4 figures

\\

We investigate the dissipative dynamics of a quantum critical system in

contact with a thermal bath. As a paradigmatic situation we focus on the

response of the system to a sudden change of the temperature of the bath. The

specific example of the XY model in a transverse magnetic field whose spins are

locally coupled to a set of bosonic baths is considered. The peculiar nature of

the dynamics is enclosed in the correlations which develop out of equilibrium.

By means of a kinetic equation we investigate the spin-spin correlation

function and also block correlations measured by quantum mutual information.

Two distinct regimes, characterized by different time and length scales, emerge

at short and long times. During the initial transient, despite being far from

equilibrium, the dynamics is characterized by the same critical exponents as

those of the equilibrium quantum phase transition. The equilibrium is

eventually reached through the propagation along the chain of a thermal front

whose speed is dictated by the final temperature and magnetic field.

\\ ( http://arxiv.org/abs/0812.4717 , 959kb)

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arXiv:0812.4750

Date: Sat, 27 Dec 2008 16:38:03 GMT (1138kb)

Title: Jordan-Wigner Fermionization and the Theory of Low-Dimensional Quantum

Spin Models. Dynamic Properties

Authors: Oleg Derzhko

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

Comments: 53 pages, 22 figures

Journal-ref: CONDENSED MATTER PHYSICS IN THE PRIME OF THE 21ST CENTURY.

Phenomena, Materials, Ideas, Methods . Edited by Janusz Jedrzejewski (World

Scientific, Singapore, 2008). P.35-87

\\

The Jordan-Wigner transformation is known as a powerful tool in condensed

matter theory, especially in the theory of low-dimensional quantum spin

systems. The aim of this chapter is to review the application of the

Jordan-Wigner fermionization technique for calculating dynamic quantities of

low-dimensional quantum spin models. After a brief introduction of the

Jordan-Wigner transformation for one-dimensional spin one-half systems and some

of its extensions for higher dimensions and higher spin values we focus on the

dynamic properties of several low-dimensional quantum spin models. We start

from the famous s=1/2 XX chain. As a first step we recall well-known results

for dynamics of the z-spin-component fluctuation operator and then turn to the

dynamics of the dimer and trimer fluctuation operators. The dynamics of the

trimer fluctuations involves both the two-fermion (one particle and one hole)

and the four-fermion (two particles and two holes) excitations. We discuss some

properties of the two-fermion and four-fermion excitation continua. The

four-fermion dynamic quantities are of intermediate complexity between simple

two-fermion (like the zz dynamic structure factor) and enormously complex

multi-fermion (like the xx or xy dynamic structure factors) dynamic quantities.

Further we discuss the effects of dimerization, anisotropy of XY interaction,

and additional Dzyaloshinskii-Moriya interaction on various dynamic quantities.

Finally we consider the dynamic transverse spin structure factor

$S_{zz}({\bf{k}},\omega)$ for the s=1/2 XX model on a spatially anisotropic

square lattice which allows one to trace a one-to-two-dimensional crossover in

dynamic quantities.

\\ ( http://arxiv.org/abs/0812.4750 , 1138kb)

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arXiv:0812.4836

Date: Sun, 28 Dec 2008 18:21:40 GMT (1403kb,D)

Title: Interference of interacting matter waves

Authors: Mattias Gustavsson, Elmar Haller, Manfred J. Mark, Johann G. Danzl,

Russell Hart, Andrew J. Daley, Hanns-Christoph Naegerl

Categories: cond-mat.other

Comments: 5 figures

\\

The phenomenon of matter wave interference lies at the heart of quantum

physics. It has been observed in various contexts in the limit of

non-interacting particles as a single particle effect. Here we observe and

control matter wave interference whose evolution is driven by interparticle

interactions. In a multi-path matter wave interferometer, the macroscopic

many-body wave function of an interacting atomic Bose-Einstein condensate

develops a regular interference pattern, allowing us to detect and directly

visualize the effect of interaction-induced phase shifts. We demonstrate

control over the phase evolution by inhibiting interaction-induced dephasing

and by refocusing a dephased macroscopic matter wave in a spin-echo type

experiment. Our results show that interactions in a many-body system lead to a

surprisingly coherent evolution, possibly enabling narrow-band and

high-brightness matter wave interferometers based on atom lasers.

\\ ( http://arxiv.org/abs/0812.4836 , 1403kb)

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arXiv:0812.4837

Date: Sun, 28 Dec 2008 21:45:31 GMT (287kb)

Title: Bose-Einstein condensation of 2D dipolar excitons: Quantum Monte Carlo

simulation

Authors: Yu. E. Lozovik, I. L. Kurbakov, G. E. Astrakharchik, and M. Willander

Categories: cond-mat.str-el

Comments: 17 pages, 8 figures

Journal-ref: JETP 106(2), 296-315 (2008)

\\

The Bose condensation of 2D dipolar excitons in quantum wells is numerically

studied by the diffusion Monte Carlo simulation method. The correlation,

microscopic, thermodynamic, and spectral characteristics are calculated. It is

shown that, in structures of coupled quantum wells, in which low-temperature

features of exciton luminescence have presently been observed, dipolar excitons

form a strongly correlated system. Their Bose condensation can experimentally

be achieved much easily than for ideal or weakly correlated excitons.

\\ ( http://arxiv.org/abs/0812.4837 , 287kb)

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arXiv:0812.4840

Date: Sun, 28 Dec 2008 18:55:44 GMT (20kb)

Title: Electron-hole pair condensation in graphene bilayer

Authors: Yu.E. Lozovik, A.A. Sokolik

Categories: cond-mat.str-el

Comments: Submitted on November 26, 2007, Published on January 10, 2008.

Several misprints in the in the original text are corrected

Journal-ref: Pis'ma v ZhETF, vol. 87, iss. 1, pp. 61-65 (2008);

Translation:JETP Letters, vol. 87, No. 1, pp. 55-59 (2008)

\\

We consider the pairing of electrons and holes due to their Coulomb

attraction in two parallel, independently gated graphene layers, separated by a

barrier. At weak coupling, there exist the BCS-like pair-condensed state.

Despite the fact that electrons and holes behave like massless Dirac fermions,

the problem of BCS-like electron-hole pairing in graphene bilayer turns out to

be rather similar to that in usual coupled semiconductor quantum wells. The

distinctions are due to Berry phase of electronic wave functions and different

screening properties. We estimate values of the gap in one-particle excitation

spectrum for different interlayer distances and carrier concentrations.

Influence of disorder is discussed. At large enough dielectric susceptibility

of surrounding medium, the weak coupling regime holds even at arbitrarily small

carrier concentrations. Localized electron-hole pairs are absent in graphene,

thus the behavior of the system versus coupling strength is cardinally

different from usual BCS-BEC crossover.

\\ ( http://arxiv.org/abs/0812.4840 , 20kb)

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arXiv:0812.4961

Date: Mon, 29 Dec 2008 19:46:07 GMT (268kb)

Title: A Gross-Pitaevskii Treatment for Supersolid He

Authors: Philip W Anderson

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

\\

The observations of non-linear rotational susceptibility (NCRI) in samples of

solid He below 1-200 mK temperatures are conjectured to be describable in terms

of a rarified Gross-Pitaevskii superfluid of vacancies (or, more generally,

incommensuracies) with a transition temperature of about 50 mK, whose density

is locally enhanced by crystal imperfections. We argue that the observations

can be much affected by this density enhancement. We argue also that it is

likely that the ground state of every pure Bose solid is supersolid.

\\ ( http://arxiv.org/abs/0812.4961 , 268kb)

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arXiv:0812.5028

Date: Tue, 30 Dec 2008 08:12:08 GMT (98kb)

Title: Asymmetric Pairing in Two-Species Fermionic System in the Presence of

Feshbach Resonance

Authors: Raka Dasgupta

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

Comments: 11 pages,5 figures

\\

We have studied asymmetric pairing in a two-species fermionic system in the

presence of Feshbach resonance, where the two types of fermions combine to form

a boson molecule. It is shown that depending on whether the bosonic chemical

potential has a greater (smaller) numerical value than the threshold energy of

the composite bose particles, the BCS gap and the critical temperature

decreases (increases). We have also obtained the stability criteria of the

Breached Pair phase for this system. Considering the BCS-BEC crossover picture,

we have identified the regime where these stability criteria are fulfilled.

\\ ( http://arxiv.org/abs/0812.5028 , 98kb)

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arXiv:0812.5059

Date: Tue, 30 Dec 2008 12:37:17 GMT (57kb)

Title: Quantum Phases of Long Range 1-D Bose-Hubbard Model: Field Theoretic and

DMRG Study at Different Densities

Authors: Manoranjan Kumar, Sujit Sarkar and S. Ramasesha

Categories: cond-mat.stat-mech

Comments: 6 pages and 5 figures

\\

We use Abelian Bosonization and density matrix renormalization group method

to study the effect of density on quantum phases of long range 1-D Bose-Hubbard

model. We predict the existence of supersolid phase and also other quantum

phases for this system. We have analyzed the role of long range interaction

parameter on solitonic phase near half filling. We discuss the effect of

dimerization in nearest neighbor hopping and interaction terms on the plateau

phase at the half filling.

\\ ( http://arxiv.org/abs/0812.5059 , 57kb)

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arXiv:0812.5067

Date: Tue, 30 Dec 2008 14:13:26 GMT (503kb)

Title: Chaotic dynamics of a Bose-Einstein condensate coupled to a qubit

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

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

Comments: 4 pages, 6 figures. Research done at

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

\\

We study numerically the coupling between a qubit and a Bose-Einstein

condensate (BEC) moving in a kicked optical lattice, using Gross-Pitaevskii

equation. In the regime where the BEC size is smaller than the lattice period,

the chaotic dynamics of the BEC is effectively controlled by the qubit state.

The feedback effects of the nonlinear chaotic BEC dynamics preserve the

coherence and purity of the qubit in the regime of strong BEC nonlinearity.

This gives an example of an exponentially sensitive control over a macroscopic

state by internal qubit states. At weak nonlinearity quantum chaos leads to

rapid dynamical decoherence of the qubit. The realization of such coupled

systems is within reach of current experimental techniques.

\\ ( http://arxiv.org/abs/0812.5067 , 503kb)

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arXiv:0812.5070

Date: Tue, 30 Dec 2008 14:18:44 GMT (724kb,D)

Title: Deeply bound ultracold molecules in an optical lattice

Authors: Johann G. Danzl, Manfred J. Mark, Elmar Haller, Mattias Gustavsson,

Russell Hart, Andreas Liem, Holger Zellmer, Hanns-Christoph Naegerl

Categories: cond-mat.other

Comments: 12 pages, 4 figures, submitted to the Special Issue of New Journal of

Physics on Cold and Ultracold Molecules

\\

We demonstrate efficient transfer of ultracold molecules into a deeply bound

rovibrational level of the singlet ground state potential in the presence of an

optical lattice. The overall molecule creation efficiency is 25%, and the

transfer efficiency to the rovibrational level |v=73,J=2> is above 80%. We find

that the molecules in |v=73,J=2> are trapped in the optical lattice, limited by

optical excitation by the lattice light. The molecule trapping time for a

lattice depth of 15 atomic recoil energies is about 20 ms. We determine the

trapping frequency by the lattice phase and amplitude modulation technique. It

will now be possible to transfer the molecules to the rovibrational ground

state |v=0,J=0> in the presence of the optical lattice.

\\ ( http://arxiv.org/abs/0812.5070 , 724kb)

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arXiv:0812.5076

Date: Tue, 30 Dec 2008 19:20:23 GMT (639kb)

Title: Resonant Landau-Zener tunneling and Rabi oscillations of matter wave

solitons

Authors: Yu. V. Bludov, V. V. Konotop, M. Salerno

Categories: cond-mat.other

Comments: Submitted to Phys. Rev. Lett

\\

The possibility of resonant tunneling and Rabi oscillations of soliton matter

waves in combined linear and nonlinear optical lattices (OLs) under the action

of an external time dependent periodic force, is first demonstrated. It is

shown that under suitable conditions these oscillations become long lived. By

switching off the external force at proper times it is possible to put the

state of the system either in a pure (stationary macroscopically populated) gap

soliton state or in an entangled state, i.e. a linear combination of two gap

solitons, with appreciably long life-time.

\\ ( http://arxiv.org/abs/0812.5076 , 639kb)

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arXiv:0812.4686

Date: Fri, 26 Dec 2008 15:35:47 GMT (165kb,D)

Title: Spatial multimode entanglement within one laser beam

Authors: J. Janousek, K. Wagner, J-F. Morizur, N. Treps, P. K. Lam, C. C. Harb,

H-A. Bachor

Categories: quant-ph

Comments: 7 pages, 3 figures

\\

Optical entanglement is a key requirement for many quantum communication

protocols. Conventionally entanglement is formed between two distinct beams,

with the quantum correlations being measured at separate locations. We show

entanglement between the modes within one beam. Our technique is particularly

elegant and a major advance towards practical systems with minimum complexity.

We demonstrate three major experimental achievements: (i) only one source is

required to produce squeezed light in two orthogonal spatial modes, (ii) the

entanglement is formed through lenses and beam rotation, without the need of a

beam splitter and (iii) the quantum correlations are measured directly and

simultaneously using a multi pixel, quadrant detector.

\\ ( http://arxiv.org/abs/0812.4686 , 165kb)

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arXiv:0812.4735

Date: Sat, 27 Dec 2008 11:10:02 GMT (484kb)

Title: Multimode quantum properties of a self-imaging OPO: squeezed vacuum and

EPR beams generation

Authors: L. Lopez (LKB - Jussieu), Beno\^it Chalopin (LKB - Jussieu), Arnaud

Rivi\`ere De La Souch\`ere (LKB - Jussieu), Claude Fabre (LKB - Jussieu),

Agn\`es Ma\^itre (LKB - Jussieu, INSP), Nicolas Treps (LKB - Jussieu)

Categories: quant-ph

\\

We investigate the spatial quantum properties of the light emitted by a

perfectly spatially degenerate optical parametric oscillator (self-imaging

OPO). We show that this device produces local squeezing for areas bigger than a

coherence are that depends on the crystal length and pump width. Furthermore,

it generates local EPR beams in the far field. We show, calculating the

eigenmodes of the system, that it is highly multimode for realistic

experimental parameters.

\\ ( http://arxiv.org/abs/0812.4735 , 484kb)

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arXiv:0812.4749

Date: Sat, 27 Dec 2008 16:11:47 GMT (403kb)

Title: Resonant Cascaded Down-Conversion

Authors: Christian Weedbrook, Ben Perrett, Karen V. Kheruntsyan, Peter D.

Drummond, Raphael C. Pooser, Olivier Pfister

Categories: quant-ph

Comments: 7 pages, 13 figures

\\

We analyze an optical parametric oscillator (OPO) in which cascaded

down-conversion occurs inside a cavity resonant for all modes but the initial

pump. Due to the resonant cascade design, the OPO present two \chi^2 level

oscillation thresholds that are therefore remarkably lower than for a \chi^3

OPO. This is promising for reaching the regime of an effective third-order

nonlinearity well above both thresholds. Such a \chi^2 cascaded device also has

potential applications in frequency conversion to far infra-red regimes. But,

most importantly, it can generate novel multi-partite quantum correlations in

the output radiation, which represent a step beyond squeezed or entangled

light. The output can be highly non-Gaussian, and therefore not describable by

any semi-classical model.

\\ ( http://arxiv.org/abs/0812.4749 , 403kb)

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arXiv:0812.4863

Date: Mon, 29 Dec 2008 01:36:17 GMT (318kb)

Title: Polarization-based Light-Atom Quantum Interface with an All-optical Trap

Authors: Marco Koschorreck, Marcin Kubasik, Mario Napolitano, Sebasti\'an R. de

Echaniz, Herbert Crepaz, J\"urgen Eschner, Eugene S. Polzik, Morgan W.

Mitchell

Categories: quant-ph

Comments: 8 pages, 4 figures

\\

We describe the implementation of a system for studying light-matter

interactions using an ensemble of $10^6$ cold rubidium 87 atoms, trapped in a

single-beam optical dipole trap. In this configuration the elongated shape of

the atomic cloud increases the strength of the collective light-atom coupling.

Trapping all-optically allows for long storage times in a low decoherence

environment. We are able to perform several thousands of measurements on one

atomic ensemble with little destruction. We report results on paramagnetic

Faraday rotations from a macroscopically polarized atomic ensemble. Our results

confirm that strong light-atom coupling is achievable in this system which

makes it attractive for single-pass quantum information protocols.

\\ ( http://arxiv.org/abs/0812.4863 , 318kb)

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arXiv:0812.4894

Date: Mon, 29 Dec 2008 11:21:33 GMT (119kb)

Title: Collective Rydberg excitations of an atomic gas confined in a ring

lattice

Authors: B. Olmos, R. Gonz\'alez-F\'erez, I. Lesanovsky

Categories: quant-ph

Comments: 10 pages, 11 figures

\\

We study the excitation dynamics of Rydberg atoms in a one-dimensional

lattice with periodic boundary conditions where the atomic Rydberg states are

resonantly excited from the electronic ground state. Our description of the

corresponding dynamics is numerically exact within the perfect blockade regime,

i.e. no two atoms in a given range can be excited. The time-evolution of the

mean Rydberg density, density-density correlations as well as entanglement

properties are analyzed in detail. We demonstrate that the short time dynamics

is universal and dominated by quantum phenomena, while for larger time the

characteristics of the lattice become important and the classical features

determine the dynamics. The results of the perfect blockade approach are

compared to the predictions of an effective Hamiltonian which includes the

interaction of two neighboring Rydberg atoms up to second order perturbation

theory.

\\ ( http://arxiv.org/abs/0812.4894 , 119kb)

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arXiv:0812.4939

Date: Mon, 29 Dec 2008 17:16:53 GMT (503kb)

Title: Stored light and EIT at high optical depths

Authors: M. Klein, Y. Xiao, M. Hohensee, D.F. Phillips, and R.L. Walsworth

Categories: quant-ph

Comments: 8 pages, 5 figures, submitted to Proc. SPIE. Version here is slightly

modified, including a different title and a redone Fig. 5

\\

We report a preliminary experimental study of EIT and stored light in the

high optical depth regime. In particular, we characterize two ways to mitigate

radiation trapping, a decoherence mechanism at high atomic density: nitrogen as

buffer gas, and a long, narrow cell geometry. Initial results show the promise

of both approaches in minimizing radiation trapping, but also reveal problems

such as optical pumping into trapped end-states. We also observe distortion in

EIT lineshapes at high optical depth, a result of interference from four-wave

mixing. Experimental results are in good qualitative agreement with theoretical

predictions.

\\ ( http://arxiv.org/abs/0812.4939 , 503kb)

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The replacement:

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arXiv:0809.0505

replaced with revised version Mon, 29 Dec 2008 19:01:05 GMT (277kb)

Title: Metastable superfluidity of repulsive fermionic atoms in optical

lattices

Authors: Achim Rosch, David Rasch, Benedikt Binz, Matthias Vojta

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

Comments: 4 pages, 3 figs; (v2) final version as published

Journal-ref: Phys. Rev. Lett. 101, 265301 (2008)

DOI: 10.1103/PhysRevLett.101.265301

\\ ( http://arxiv.org/abs/0809.0505 , 277kb)

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Till next time,

Matt.

-- ========================================================================= Dr M. J. Davis, Associate Professor in Physics School of Mathematics and Physics, ph : +61 7 334 69824 The University of Queensland, fax : +61 7 336 51242 Brisbane, QLD 4072, mdavis_at_physics.uq.edu.au Australia. www.physics.uq.edu.au/people/mdavis/ ========================================================================= Matt's arXiv selection: weekly summary of cold-atom papers from arXiv.org http://www.physics.uq.edu.au/people/mdavis/matts_arXiv/ ========================================================================= Legal stuff: Unless stated otherwise, this e-mail represents only the views of the sender and not the views of the University of Queensland =========================================================================Received on Fri May 01 2009 - 15:51:03 EST

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