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

Date: Mon, 18 May 2009 22:44:08 +1000

Date: Mon, 18 May 2009 22:44:08 +1000

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

Dear subscribers,

I would like to thank Andy Ferris for collating the initial list of abstracts in

this post. There are 43 new preprints and 14 replacements.

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arXiv:0902.2212

Date: Thu, 12 Feb 2009 21:00:19 GMT (214kb)

Title: Dynamical Mean-Field Analysis of the Multispecies Bose-Hubbard Model

Authors: A. Hubener, M. Snoek, W. Hofstetter

Categories: cond-mat.other

Comments: 4+ pages, 4 figures

\\

We investigate the Bose-Hubbard model by means of Bosonic Dynamical

Mean-Field Theory (BDMFT). For spinless bosons this yields a phase diagram

where the Mott-lobes are enhanced compared to the mean-field result. Applying

BDMFT to two-component bosonic mixtures such as 87Rb - 41K we find a rich phase

diagram where besides the Z-antiferromagnet, XY-ferromagnet and XY-superfluid

also a supersolid phase is present.

\\ ( http://arxiv.org/abs/0902.2212 , 214kb)

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arXiv:0902.2225

Date: Thu, 12 Feb 2009 22:59:47 GMT (1943kb)

Title: Persistent current of Luttinger liquid in one-dimensional ring with weak

link: Continuous model studied by configuration interaction and quantum Monte

Carlo

Authors: R. N\'emeth, M. Mo\v{s}ko, R. Kr\v{c}m\'ar, A. Gendiar, M. Indlekofer

and L. Mitas

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

Comments: 20 pages, 20 figures included

\\

We study the persistent current of correlated spinless electrons in a

continuous one-dimensional ring with a single weak link. We include

correlations by solving the many-body Schrodinger equation for several tens of

electrons interacting via the short-ranged pair interaction V(x - x'). We solve

this many-body problem by advanced configuration-interaction (CI) and diffusion

Monte Carlo (DMC) methods. Our CI and DMC results show, that the persistent

current (I) as a function of the ring length (L) exhibits for large L the power

law typical of the Luttinger liquid, $I \propto L^{-1-\alpha}$, where the power

$\alpha$ depends only on the electron-electron (e-e) interaction. For strong

e-e interaction the previous theories predicted for $\alpha$ the formula

$\alpha = {(1 + 2 \alpha_{RG})}^{1/2} - 1$, where $\alpha_{RG} =

[V(0)-V(2k_F)]/2\pi \hbar v_F$ is the renormalisation-group result for weakly

interacting electrons, with V(q) being the Fourier transform of V(x-x'). Our

numerical data show that this theoretical result holds in the continuous model

only if the range of V(x - x') is small (roughly $d \lesssim 1/2k_F$, more

precisely $4d^2k_F^2 << 1$). For strong e-e interaction ($\alpha_{RG} > 0.25$)

our CI data show the power law $I \propto L^{-1-\alpha}$ already for rings with

only ten electrons, i.e., ten electrons are already enough to behave like the

Luttinger liquid. The DMC data for $\alpha_{RG} > 0.25$ are damaged by the

so-called fixed-phase approximation. Finally, we also treat the e-e interaction

in the Hartree-Fock approximation. We find the exponentially decaying I(L)

instead of the power law, however, the slope of log(I(L)) still depends solely

on the parameter $\alpha_{RG}$ as long as the range of V(x - x') approaches

zero.

\\ ( http://arxiv.org/abs/0902.2225 , 1943kb)

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arXiv:0902.2275

Date: Fri, 13 Feb 2009 09:14:34 GMT (443kb,D)

Title: Angular FFLO State in Cold Fermion Gases in Toroidal Trap

Authors: Youichi Yanase

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

\\

We study the possibility of angular Fulde-Ferrel-Larkin-Ovchinnikov (FFLO)

state, in which the rotation symmetry is spontaneously broken, in population

imbalanced fermion gases near the BCS-BEC crossover. We investigate the

superfluid at low temperatures on the basis of the Bogoliubov-de Gennes

equation, and examine the stability against thermal fluctuations using the

T-matrix approach beyond LDA. We find that the angular FFLO state is stabilized

in the gases confined in the toroidal trap, but not in the harmonic trap. The

angular FFLO state is stable near the BCS-BEC crossover owing to the pseudogap.

Spatial dependences of number density and local population imbalance are shown

for an experimental test.

\\ ( http://arxiv.org/abs/0902.2275 , 443kb)

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arXiv:0902.2276

Date: Fri, 13 Feb 2009 09:23:51 GMT (312kb)

Title: Static and dynamical properties of a two-dimensional Wigner crystal of

rotating dipolar Fermi gases

Authors: Szu-Cheng Cheng

Categories: cond-mat.other

Comments: 25 pages, 8 figures

\\

Using an ansatz wave function for the ground state of rotating

two-dimensional dipolar fermions, which occupy only partially the lowest Landau

level, we study the correlation energy and elastic properties of the Wigner

crystal of rotating dipolar Fermi gases. From a simple Hartree-Fock approach,

we show that the correlation energy of a particle crystal is lower and higher

than the correlation energy of a hole crystal for filling factors v<1/2 and

v>1/2, respectively. Furthermore we find that the shear moduli of these dipolar

crystals have a nonmonotonic behavior as a function of the filling factor. We

also examine the stability of a Wigner crystal. The Wigner crystal with the

sample width being zero is locally stable for 0< v <1/2, while the

corresponding hole crystal is locally stable for 1/2< v <1. Due to the WC being

unstable around v=1/2, we also conclude that a new liquid state, not a quantum

Hall state, can exist at v=1/2.

\\ ( http://arxiv.org/abs/0902.2276 , 312kb)

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arXiv:0901.1106 (*cross-listing*)

Date: Thu, 8 Jan 2009 18:44:45 GMT (13kb)

Date (revised v2): Mon, 19 Jan 2009 17:04:50 GMT (13kb)

Title: Bose-Einstein Condensation of Dark Matter Axions

Authors: P. Sikivie and Q. Yang

Categories: hep-ph astro-ph.CO cond-mat.stat-mech

Comments: 5 pages, 1 figure. An error is corrected, and several references

added. The conclusions are unchanged

Report-no: UFIFT-HEP-09-1

\\

We show that cold dark matter axions thermalize and form a Bose-Einstein

condensate. We obtain the axion state in a homogeneous and isotropic universe,

and derive the equations governing small axion perturbations. Because they form

a BEC, axions differ from ordinary cold dark matter. A repulsive force

suppresses the formation of caustics and hence of small scale structure.

Bose-Einstein condensation of dark matter axions provides a mechanism for the

production of net overall rotation in dark matter halos, and for the alignment

of cosmic microwave anisotropy multipoles.

\\ ( http://arxiv.org/abs/0901.1106 , 13kb)

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arXiv:0902.2234

Date: Fri, 13 Feb 2009 01:08:49 GMT (520kb)

Title: Entanglement Transfer from Bosonic Systems to Qubits

Authors: Andrzej Veitia

Categories: quant-ph

\\

We study the entanglement of a pair of qubits resulting from their

interaction with a bosonic system. Here we restrict our discussion to the case

where the set of operators acting on different qubits commute. A special class

of interactions inducing entanglement in an initially separable two qubit

system is discussed. Our results apply to the case where the initial state of

the bosonic system is represented by a statistical mixture of states with fixed

particle number.

\\ ( http://arxiv.org/abs/0902.2234 , 520kb)

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arXiv:0902.2249

Date: Fri, 13 Feb 2009 12:13:59 GMT (546kb)

Title: Monitoring the wave function by time continuous position measurement

Authors: Thomas Konrad, Andreas Rothe, Francesco Petruccione and Lajos Di\'osi

Categories: quant-ph

Comments: 14 pages, 5 figures. For associated avi file (movie) see

http://physics.ukzn.ac.za/~konrad/waveandfid.avi

\\

We consider a single copy of a quantum particle moving in a potential and

show that it is possible to monitor its complete wave function by only

continuously measuring its position. While we assume that the potential is

known, no information is available about its state initially. In order to

monitor the wave function, an estimate of the wave function is propagated due

to the influence of the potential and continuously updated according to the

results of the position measurement. We demonstrate by numerical simulations

that the estimation reaches arbitrary values of accuracy below 100 percent

within a finite time period for the potentials we study. In this way our method

grants, a certain time after the beginning of the measurement, an accurate

real-time record of the state evolution including the influence of the

continuous measurement. Moreover, it is robust against sudden perturbations of

the system as for example random momentum kicks from environmental particles,

provided they occur not too frequently.

\\ ( http://arxiv.org/abs/0902.2249 , 546kb)

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arXiv:0902.2252

Date: Fri, 13 Feb 2009 03:20:46 GMT (489kb)

Title: Single photon quantum non-demolition in the presence of inhomogeneous

broadening

Authors: Andrew D. Greentree, R. G. Beausoleil, L. C. L. Hollenberg, W. J.

Munro, Kae Nemoto, S. Prawer, and T. P. Spiller

Categories: quant-ph

Comments: 21 pages, 9 figures (some in colour) at low resolution for arXiv

purposes

\\

Electromagnetically induced transparency (EIT) has been often proposed for

generating nonlinear optical effects at the single photon level; in particular,

as a means to effect a quantum non-demolition measurement of a single photon

field. Previous treatments have usually considered homogeneously broadened

samples, but realisations in any medium will have to contend with inhomogeneous

broadening. Here we reappraise an earlier scheme [Munro \textit{et al.} Phys.

Rev. A \textbf{71}, 033819 (2005)] with respect to inhomogeneities and show an

alternative mode of operation that is preferred in an inhomogeneous

environment. We further show the implications of these results on a potential

implementation in diamond containing nitrogen-vacancy colour centres. Our

modelling shows that single mode waveguide structures of length $200

\mu\mathrm{m}$ in single-crystal diamond containing a dilute ensemble of NV$^-$

of only 200 centres are sufficient for quantum non-demolition measurements

using EIT-based weak nonlinear interactions.

\\ ( http://arxiv.org/abs/0902.2252 , 489kb)

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arXiv:0902.2229

Date: Thu, 12 Feb 2009 22:55:02 GMT (228kb,D)

Title: Measurement of inelastic losses in a sample of ultracold Rb-85

Authors: P. A. Altin, N. P. Robins, J. E. Debs, D. D\"oring, C. Figl and J. D.

Close

Categories: physics.atom-ph

Comments: 4 pages, 3 figures

\\

We describe a setup used to create ultracold Rb-85 clouds by sympathetic

cooling with a Rb-87 reservoir. The machine produces pure Rb-87 condensates of

10^6 atoms in a tightly-confining quadrupole-Ioffe (QUIC) magnetic trap. By

combining Rb-85 and Rb-87 atoms collected in a dual-species magneto-optical

trap and selectively evaporating the heavier isotope, we demonstrate strong

sympathetic cooling of the Rb-85 cloud, increasing its phase space density by

three orders of magnitude with no detectable loss in number. We have used

ultracold samples created in this way to observe the variation of inelastic

losses in Rb-85 as a function of magnetic field near the 155 G Feshbach

resonance, including a previously unobserved feature associated with a

predicted Feshbach resonance near 215 G. With further evaporation in an optical

dipole trap, temperatures below 100 nK and phase space densities of 0.2 have

been achieved.

\\ ( http://arxiv.org/abs/0902.2229 , 228kb)

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arXiv:0902.2401

Date: Fri, 13 Feb 2009 21:35:45 GMT (75kb)

Title: Energy Transport in a One-Dimensional Granular Gas

Authors: Italo Ivo Lima Dias Pinto, Alexandre Rosas, Katja Lindenberg

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

\\

We study heat conduction in one-dimensional granular gases. In particular, we

consider two mechanisms of viscous dissipation during inter-grain collisions.

In one, the dissipative force is proportional to the grain's velocity and

dissipates not only energy but also momentum. In the other, the dissipative

force is proportional to the relative velocity of the grains and therefore

conserves momentum even while dissipating energy. This allows us to explore the

role of momentum conservation in the heat conduction properties of this

one-dimensional nonlinear system. We find normal thermal conduction whether or

not momentum is conserved.

\\ ( http://arxiv.org/abs/0902.2401 , 75kb)

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arXiv:0902.2461

Date: Sat, 14 Feb 2009 12:14:32 GMT (118kb)

Title: Casimir-Polder force out of thermal equilibrium

Authors: G.V.Dedkov, A.A.Kyasov

Categories: cond-mat.other

Comments: 10 pages, 2 figures

\\

We calculate equilibrium and nonequilibrium Casimir-Polder force felt by a

small particle (an atom)near a flat substrate using the framework of

fluctuation electrodynamics in configuration of a small sphere above a flat

substrate. A numerical example is given for a SiC micron -sized particle above

a SiC substrate. Different temperature configurations are considered.

\\ ( http://arxiv.org/abs/0902.2461 , 118kb)

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arXiv:0902.2463

Date: Sat, 14 Feb 2009 12:29:39 GMT (203kb)

Title: Emergence of Topological Fermi Liquid from a Strongly Correlated Bosonic

System in Optical Superlattices

Authors: Bo-lun Chen and Su-peng Kou

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

Comments: 9 pages, 5 figures

\\

Recent experiments on quantum degenerate gases give an opportunity for

simulating strongly-correlated electronic systems in optical lattices. It may

shed light on some long-standing puzzles in condensed-matter physics, like the

nature of high-temperature superconductivity in cuprates that had baffled

people over two decades. It is believed that the two-dimensional fermionic

Hubbard model, or t-J model, contains the key to this problem; but the

difficulty of unveiling the mystery of a strongly-interacting fermionic system

is also generally acknowledged. Here, as a substitute, we systematically

analyze the property of bosonic t-J model simulated in optical superlattices

near unit-filling. In particular, we show the emergence of a strange

topological Fermi liquid with Fermi surfaces from a purely bosonic system. We

also discuss the possibility of observing these phenomena in ultracold atom

experiments. The result may provide some crucial insights into the origin of

high-T_{c} superconductivity.

\\ ( http://arxiv.org/abs/0902.2463 , 203kb)

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arXiv:0902.2529

Date: Sun, 15 Feb 2009 08:20:08 GMT (100kb)

Title: External force affected escape of Brownian particles from a potential

well

Authors: A. I. Shushin

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

Comments: 11 pages, 3 figures

\\

The effect of an external force on the kinetics of diffusion-assisted

escaping of Brownian particles from a potential well is analyzed in detail. The

analysis is made within the two-state model of the process which is known to be

valid in the deep well limit in the absence of external force. The generalized

variant of this model, taking into account the effect of the force, is shown to

be quite accurate as well for some shapes of the well. Within the generalized

two-state model simple expressions for the well depopulation kinetics and, in

particular, the for the escape rate are obtained. These expressions show that

the effect of the force ($F$) manifests itself in the escape rate dependence on

the only parameter $\varphi = Fa/(2k_b T)$, where $a$ is the Onzager radius of

the attractive part of the well $U(r)$, defined by the relation $|U(a)| = k_b

T$. The limiting behavior of this dependence in the cases of weak and strong

force is analyzed in detail. Possible applications as well as the relation of

the results of the analysis to those obtained earlier are briefly discussed.

\\ ( http://arxiv.org/abs/0902.2529 , 100kb)

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arXiv:0902.2586

Date: Sun, 15 Feb 2009 23:56:06 GMT (26kb,D)

Title: Modulation Spectroscopy and Dynamics of Double Occupancies in a

Fermionic Mott Insulator

Authors: Rajdeep Sensarma, David Pekker, Mikhail D. Lukin and Eugene Demler

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

Comments: 4 pages 2 figures

\\

We calculate the rate of creation of double occupancies in a 3D

Fermionic Mott insulator near half-filling by modulation of optical lattice

potential. At high temperatures, incoherent holes lead to a broad response

peaked at the Hubbard repulsion $U$. At low temperatures, antiferromagnetic

order leads to a coherent peak for the hole along with broad features

representing spin wave shake-off processes. This is manifested in the doublon

creation rate as a sharp absorption edge and oscillations as a function of

modulating frequency. Thus, modulation spectroscopy can be used as a probe of

antiferromagnetic order and nature of quasiparticle excitations in the system.

\\ ( http://arxiv.org/abs/0902.2586 , 26kb)

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arXiv:0902.2705

Date: Mon, 16 Feb 2009 15:22:31 GMT (336kb)

Title: Quantum correlated light pulses from sequential superradiance of a

condensate

Authors: M.E. Tasgin, M.O. Oktel, L. You, and O.E. Mustecaplioglu

Categories: cond-mat.other

Comments: 10 pages, 6 figures

\\

We discover an inherent mechanism for entanglement swap associated with

sequential superradiance from an atomic Bose-Einstein condensate. Based on

careful examinations with both analytical and numerical approaches, we conclude

that as a result of the swap mechanism, Einstein-Podolsky-Rosen (EPR)-type

quantum correlations can be detected among the scattered light pulses.

\\ ( http://arxiv.org/abs/0902.2705 , 336kb)

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arXiv:0902.2721

Date: Mon, 16 Feb 2009 16:03:47 GMT (175kb)

Title: Short-Time Enhanced Decay of Coherent Excitations in Bose-Einstein

Condensates

Authors: Nir Bar-Gill, Eitan E. Rowen, Gershon Kurizki and Nir Davidson

Categories: cond-mat.other

Comments: 4 pages, 5 figures

\\

We study, both experimentally and theoretically, short-time modifications of

the decay of excitations in a Bose-Einstein Condensate (BEC) embedded in an

optical lattice. Strong enhancement of the decay is observed compared to the

Golden Rule results. This enhancement of decay increases with the lattice

depth. It indicates that the description of decay modifications of few-body

quantum systems also holds for decay of many-body excitations of a BEC.

\\ ( http://arxiv.org/abs/0902.2721 , 175kb)

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arXiv:0902.2558

Date: Sun, 15 Feb 2009 18:42:32 GMT (206kb,D)

Title: Probing Interactions between Ultracold Fermions

Authors: G. K. Campbell, M. M. Boyd, J. W. Thomsen, M. J. Martin, S. Blatt, M.

D. Swallows, T. L. Nicholson, T. Fortier, C. W. Oates, S. A. Diddams, N. D.

Lemke, P. Naidon, P. Julienne, Jun Ye, A. D. Ludlow

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

Comments: Submitted to Science

\\

At ultracold temperatures, the Pauli exclusion principle suppresses

collisions between identical fermions. This has motivated the development of

atomic clocks using fermionic isotopes. However, by probing an optical clock

transition with thousands of lattice-confined, ultracold fermionic Sr atoms, we

have observed density-dependent collisional frequency shifts. These collision

effects have been measured systematically and are supported by a theoretical

description attributing them to inhomogeneities in the probe excitation process

that render the atoms distinguishable. This work has also yielded insights for

zeroing the clock density shift.

\\ ( http://arxiv.org/abs/0902.2558 , 206kb)

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arXiv:0902.2427

Date: Sat, 14 Feb 2009 02:32:38 GMT (127kb)

Title: Bistable Mott-insulator to superfluid phase transition in cavity

optomechanics

Authors: W. Chen, K. Zhang, D. S. Goldbaum, M. Bhattacharya, P. Meystre

Categories: quant-ph

Comments: 5 pages, 3 figures

\\

We study the many-body state of ultracold bosons in a bistable optical

lattice potential in an optomechanical resonator in the weak-coupling limit.

New physics arises as a result of bistability and discontinuous jumps in the

cavity field. Of particular interest is the situation where the optical cavity

is engineered so that a single input beam can result in two radically different

stable ground states for the intracavity gas: superfluid and Mott-insulator.

\\ ( http://arxiv.org/abs/0902.2427 , 127kb)

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arXiv:0902.2638

Date: Mon, 16 Feb 2009 09:20:25 GMT (101kb)

Title: Quantum Phases of Ultracold Bosonic Atoms in two Bands of an

Optical-Lattice coupled by a Cavity Field

Authors: Hashem Zoubi, and Helmut Ritsch

Categories: quant-ph

Comments: 12 pages, 18 figures

\\

We study the quantum phase transitions between superfluid and Mott insulator

states for ultracold bosons occupying two bands of an optical lattice. The two

atomic states are resonantly coupled by a single cavity mode which mediates

transitions between the two bosonic particle modes via absorption or emission

of a cavity photon. This coupling between the bands shifts the appearance of

the Mott insulator phase towards deeper optical lattice potentials and stronger

on-site interaction strength, as atomic coherence can build up via photon

assisted tunneling in both bands. Varying the intra and interband on-site

interactions leads to several different atomic phase configurations. There are

even parameter regions where a mean field approach predicts concurrence of a

Mott insulator state in one band, while atoms in the second band stay

superfluid.

\\ ( http://arxiv.org/abs/0902.2638 , 101kb)

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arXiv:0902.2745

Date: Mon, 16 Feb 2009 17:40:09 GMT (133kb)

Title: Vapor pressure dependence of spectral width of EIT in Lambda-level

cesium molecular system

Authors: Hui Chen, Hebin Li, Yuri V. Rostovtsev, Mikhail A. Gubin, Vladimir A.

Sautenkov, and Marlan O. Scully

Categories: quant-ph

Comments: 7 pages, 3 figures

\\

We have studied electromagnetically induced transparency (EIT) in diatomic

cesium molecules in a vapor cell by using tunable diode lasers. We have

observed a sub-natural Lambda-resonance in an absorption molecular band at

different cesium vapor pressures. The width of the EIT resonance shows a linear

dependence on cesium vapor pressure. Narrow Lambda-resonances in molecules can

be used as frequency references for femtosecond laser frequency combs.

\\ ( http://arxiv.org/abs/0902.2745 , 133kb)

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arXiv:0902.0172

Date: Mon, 2 Feb 2009 00:26:57 GMT (111kb)

Title: Effects of a dilute gas of fermions on the superfluid-insulator phase

diagram of the Bose-Hubbard model

Authors: Sumanta Tewari, Roman Lutchyn, S. Das Sarma

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

Comments: 16 pages, 3 eps figures

\\

Building on the work of Fisher et al. (Phys. Rev. B 40, 546 (1989)), we

develop a framework for perturbation theory in the Bose-Hubbard model and apply

it to calculate the effects of a degenerate gas of spin-polarized fermions

interacting by contact interactions with the constituent bosons. For the

single-band Bose-Hubbard model, the only non-trivial effect of the fermions is

to induce an effective space- and time-dependent density-density interaction

among the bosons. Using a path integral formulation, we develop the appropriate

theory describing the perturbative effects of this fermion-mediated interaction

(fermionic screening) on the generic superfluid-insulator phase diagram. For

the single-band Bose-Hubbard model, we find that the net effect of the fermions

is to inherently suppress the Mott-insulating lobes and enhance the area

occupied by the superfluid phase in the phase diagram. For the more general

multi-band Bose-Hubbard model, we find that, in addition to the fermion

screening of the boson interactions, the virtual excitations of the bosons to

the higher Bloch bands coupled with the contact interactions with the fermions

result in an effective increase of the boson on-site repulsion. If this

renormalization of the boson on-site potential is dominant over the fermion

screening of the boson interactions, the area of the Mott insulating lobes of

the Bose-Hubbard phase diagram will be enhanced for either sign of the

boson-fermion interactions, as seen in recent experiments.

\\ ( http://arxiv.org/abs/0902.0172 , 111kb)

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arXiv:0902.2636

Date: Mon, 16 Feb 2009 09:07:15 GMT (120kb)

Title: The Ideal Gas Behavior is in Fact Nothing, But a Macroscopic Quantum

Mechanical Manifestation

Authors: Tolga Yarman, Alexander L. Kholmetskii, Jean-Louis Tane

Categories: physics.class-ph physics.atom-ph

Comments: 14 pages, no figures

\\

This article mainly consists in the quantum mechanical study of an

adiabatically compressed particle, in an infinitely high well, which we

conjecture, can be considered as the basis of an ideal gas. Thus we prove that,

all the compression energy is, as may be expected, transformed into extra

kinetic energy of the particle. This result frames a quantum mechanical

definition of an ideal gas. It further helps the elucidation of a paradox.

\\ ( http://arxiv.org/abs/0902.2636 , 120kb)

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arXiv:0902.2608

Date: Mon, 16 Feb 2009 05:54:53 GMT (153kb)

Title: A Brief Overview of the Major Contribution to Physics by Landau

Authors: C Sivaram (1) and Kenath Arun (2) ((1) Indian Institute of

Astrophysics, Bangalore; (2) Christ Junior College)

Categories: physics.gen-ph

Comments: This article highlights some of the major contribution to physics by

the most versatile physicist, L D Landau

\\

Lev Davidovich Landau was arguably one of the greatest and most versatile

physicists. His work spans a very wide range and has had a considerable impact

on all areas of physics including condensed matter physics, plasma, high energy

and particle physics, fluid dynamics, astrophysics, gravitation, elasticity,

etc. Along with his former fellow student, E Lifshitz, he wrote the set of a

dozen volumes, the magnificent world-renowned Course of Theoretical Physics

which covered topics ranging from mechanics, classical theory of fields,

quantum mechanics, electrodynamics of continuous media, fluid dynamics, kinetic

theory, theory of elasticity, statistical physics and more.

\\ ( http://arxiv.org/abs/0902.2608 , 153kb)

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arXiv:0902.2854

Date: Tue, 17 Feb 2009 08:13:49 GMT (60kb)

Title: Pseudo-potential of an arbitrary isotropic interaction in

two-dimensional systems

Authors: Sheng-Ming Shih and Daw-Wei Wang

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

Comments: 5 pages and 2 figures

\\

We analytically derive the general pseudo-potential operator of an arbitrary

isotropic interaction for particles confined in two-dimensional (2D) systems,

using the same frame work developed by Huang and Yang for 3D scattering [Phys.

Rev. {\bf 105}, 767 (1957)]. We also analytically derive the low energy

dependence of the phase-shift for an arbitrary potential with a power-law

decaying tail, $V_{\rm 2D}(\rho)\propto \rho^{-\alpha}$ (for $\alpha>2$). We

apply our results to the 2D dipolar gases ($\alpha=3$) as an example,

calculating the momentum and dipole moment dependence of the pseudo-potential

for both $s$- and p-wave scattering channels if the two scattering particles

are in the same 2D layer. We also calculate the result for the s-wave

scattering between particles in two different (parallel) layers. Our analytic

and numerical results can be directly applied to the study of many-body

properties of magnetic dipolar atoms and/or polar molecules in a general 2D

system.

\\ ( http://arxiv.org/abs/0902.2854 , 60kb)

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arXiv:0902.2908

Date: Tue, 17 Feb 2009 12:14:59 GMT (77kb)

Title: Supercurrent induced by tunneling Bogoliubov excitations in a

Bose-Einstein condensate

Authors: Shunji Tsuchiya, Yoji Ohashi

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

Comments: 36 pages, 12 figures

\\

We study the tunneling of Bogoliubov excitations through a barrier in a

Bose-Einstein condensate. We extend our previous work [Phys. Rev. A {\textbf

78}, 013268 (2008)] to the case when condensate densities are different between

the left and right of the barrier potential. In the framework of the Bogoliubov

mean-field theory, we calculate the transmission probability and phase shift,

as well as the energy flux and quasiparticle current carried by Bogoliubov

excitations. We find that Bogoliubov phonons twist the condensate phase due to

a back-reaction effect, which induces the Josephson supercurrent. While the

total current given by the sum of quasiparticle current and induced

supercurrent is conserved, the quasiparticle current flowing through the

barrier potential is shown to be remarkably enhanced in the low energy region.

When the condensate densities are different between the left and right of the

barrier, the excess quasiparticle current, as well as the induced supercurrent,

remain finite far away from the barrier. We also consider the tunneling of

excitations and atoms through the boundary between the normal and superfluid

regions. We show that supercurrent can be generated inside the condensate by

injecting free atoms from outside. On the other hand, atoms are emitted when

the Bogoliubov phonons propagate toward the phase boundary from the superfluid

region.

\\ ( http://arxiv.org/abs/0902.2908 , 77kb)

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arXiv:0902.2979

Date: Tue, 17 Feb 2009 19:19:50 GMT (30kb)

Title: Caustic formation in expanding condensates of cold atoms

Authors: J. T. Chalker, B. Shapiro

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

Comments: 9 pages, 3 figures

\\

We study the evolution of density in an expanding Bose-Einstein condensate

that initially has a spatially varying phase, concentrating on behaviour when

these phase variations are large. In this regime large density fluctuations

develop during expansion. Maxima have a characteristic density that diverges

with the amplitude of phase variations and their formation is analogous to that

of caustics in geometrical optics. We analyse in detail caustic formation in a

quasi-one dimensional condensate, which before expansion is subject to a

periodic or random optical potential, and we discuss the equivalent problem for

a quasi-two dimensional system. We also examine the influence of many-body

correlations in the initial state on caustic formation for a Bose gas expanding

from a strictly one-dimensional trap. In additon, we study a similar

arrangement for non-interacting fermions, showing that Fermi surface

discontinuities in the momentum distribution give rise in that case to sharp

peaks in the spatial derivative of the density. We discuss recent experiments

and argue that fringes reported in time of flight images by Chen and co-workers

[Phys. Rev. A 77, 033632 (2008)] are an example of caustic formation.

\\ ( http://arxiv.org/abs/0902.2979 , 30kb)

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\\

arXiv:0902.2877

Date: Tue, 17 Feb 2009 09:53:36 GMT (679kb,D)

Title: Exploiting the composite character of Rydberg atoms for cold atom

trapping

Authors: M. Mayle, I. Lesanovsky and P. Schmelcher

Categories: physics.atom-ph

Comments: 5 pages, 3 figures

\\

By investigating the quantum properties of magnetically trapped nS Rydberg

atoms, it is demonstrated that the composite nature of Rydberg atoms

significantly alters their trapping properties opposed to point-like particles

with the same magnetic moment. We show how the specific signatures of the

Rydberg trapping potential can be probed by means of ground state atoms that

are off-resonantly coupled to the Rydberg state via a two photon laser

transition. In addition, it is demonstrated how this approach provides new

possibilities for generating traps for ground state atoms. Simulated

time-of-flight pictures mirroring the experimental situation are provided.

\\ ( http://arxiv.org/abs/0902.2877 , 679kb)

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\\

arXiv:0902.3021

Date: Tue, 17 Feb 2009 23:52:43 GMT (160kb)

Title: Observation of Fermi Polarons in a Tunable Fermi Liquid of Ultracold

Atoms

Authors: Andre Schirotzek, Cheng-Hsun Wu, Ariel Sommer, and Martin W. Zwierlein

Categories: cond-mat.other

Comments: 4 pages, 4 figures

\\

We have observed Fermi polarons, dressed spin down impurities in a spin up

Fermi sea of ultracold atoms. The polaron manifests itself as a narrow peak in

the impurities' rf spectrum that emerges from a broad incoherent background. We

determine the polaron energy and the quasiparticle residue for various

interaction strengths around a Feshbach resonance. At a critical interaction,

we observe the transition from polaronic to molecular binding. Here, the

imbalanced Fermi liquid undergoes a phase transition into a Bose liquid

coexisting with a Fermi sea.

\\ ( http://arxiv.org/abs/0902.3021 , 160kb)

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\\

arXiv:0902.3138

Date: Wed, 18 Feb 2009 13:24:14 GMT (470kb)

Title: Theory of coherence in Bose-Einstein condensation phenomena in a

microwave driven interacting magnon gas

Authors: Sergio M. Rezende

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

Comments: 26 pages, 9 figures, 46 references

\\

Strong experimental evidences of the formation of quasi-equilibrium

Bose-Einstein condensation (BEC) of magnons at room temperature in a film of

yttrium iron garnet (YIG) excited by microwave radiation have been recently

reported. Here we present a theory for the magnon gas driven by a microwave

field far out of equilibrium showing that the nonlinear magnetic interactions

create cooperative mechanisms for the onset of a phase transition leading to

the spontaneous generation of quantum coherence and magnetic dynamic order in a

macroscopic scale. The theory provides rigorous support for the formation of a

BEC of magnons in a YIG film magnetized in the plane. We show that the system

develops coherence only when the microwave driving power exceeds a threshold

value and that the theoretical result for the intensity of the Brillouin light

scattering from the BEC as a function of power agrees with the experimental

data. The theory also explains quantitatively experimental measurements of

microwave emission from the uniform mode generated by the confluence of BEC

magnon pairs in a YIG film when the driving power exceeds a critical value.

\\ ( http://arxiv.org/abs/0902.3138 , 470kb)

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arXiv:0902.3206

Date: Wed, 18 Feb 2009 17:50:18 GMT (49kb)

Title: Josephson oscillations in binary mixtures of F=1 spinor BECs

Authors: B. Julia-Diaz, M. Guilleumas, M. Lewenstein, A. Polls, A. Sanpera

Categories: cond-mat.other

Comments: 3 figures, 4 pages

\\

We study Josephson oscillations of a two component Bose-Einstein condensate

(BEC) in a double well-potential. We demonstrate that in the strongly polarized

case, the less populated component exhibits anti-Josephson behavior, i.e.

oscillates in phase with the more populated one. For the case of balanced

populations, the oscillations frequency does not depend on atomic interactions.

Both effects may serve to control the Josephson oscillations and to measure

precisely the relevant scattering lengths.

\\ ( http://arxiv.org/abs/0902.3206 , 49kb)

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\\

arXiv:0902.3227

Date: Wed, 18 Feb 2009 19:37:53 GMT (17kb)

Title: Gaussian phase-space representation of Fermion dynamics; Beyond the

time-dependent-Hartree-Fock approximation

Authors: Saar Rahav, Shaul Mukamel

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

Comments: 12 pages

\\

A Gaussian operator representation for the many body density matrix of

fermionic systems, developed by Corney and Drummond [Phys. Rev. Lett, v93,

260401 (2004)], is used to derive new approximation schemes for their dynamics.

In this approach the reduced single electron density matrix elements serve as

stochastic variables which satisfy an exact Fokker-Planck equation. The number

of variables scales as ~N^2 rather than ~exp(N) with the basis set size, and

the time dependent Hartree Fock approximation (TDHF) is recovered in the

"classical" limit. An approximate closed set of equations of motion for the one

and two-particle reduced density matrices, provides a direct generalization of

the TDHF.

\\ ( http://arxiv.org/abs/0902.3227 , 17kb)

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\\

arXiv:0902.3228

Date: Wed, 18 Feb 2009 19:54:33 GMT (655kb,D)

Title: Ultracold atomic gas in non-Abelian gauge potentials: The case of

constant Wilson loop

Authors: N. Goldman, A. Kubasiak, P. Gaspard and M. Lewenstein

Categories: cond-mat.mes-hall

Comments: To appear in Phys. Rev. A (12 pages, 2 appendices, 7 figures)

\\

Nowadays it is experimentally feasible to create artificial, and in

particular, non-Abelian gauge potentials for ultracold atoms trapped in optical

lattices. Motivated by this fact, we investigate the fundamental properties of

an ultracold Fermi gas in a non-Abelian U(2) gauge potential characterized by a

constant Wilson loop. Under this specific condition, the energy spectrum

exhibits a robust band structure with large gaps and reveals a new fractal

figure. The transverse conductivity is related to topological invariants and is

shown to be quantized when the Fermi energy lies inside a gap of the spectrum.

We demonstrate that the analogue of the integer quantum Hall effect for neutral

atoms survives the non-Abelian coupling and leads to a striking fractal phase

diagram. Moreover, this coupling induces an anomalous Hall effect as observed

in graphene.

\\ ( http://arxiv.org/abs/0902.3228 , 655kb)

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\\

arXiv:0902.3125

Date: Wed, 18 Feb 2009 13:04:53 GMT (5kb)

Title: Ermakov-Lewis Invariants of the Gross-Pitaevskii Equation

Authors: J.M.F.Bassalo, P.T.S.Alencar, D.G.Silva, A.B.Nassar and M. Cattani

Categories: quant-ph

Comments: No figures 7 pages

\\

In this work we study the Ermakov-Lewis invariants of the non-linear

Gross-Pitaeviskii equation

\\ ( http://arxiv.org/abs/0902.3125 , 5kb)

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\\

arXiv:0902.3235

Date: Wed, 18 Feb 2009 20:30:22 GMT (349kb)

Title: Dispersive interactions between atoms and non planar surfaces

Authors: Riccardo Messina, Diego A. R. Dalvit, Paulo A. Maia Neto, Astrid

Lambrecht, and Serge Reynaud

Categories: quant-ph

Comments: 10 pages, 4 figures

\\

We calculate the dispersive force between a ground state atom and a non

planar surface. We present explicit results for a corrugated surface, derived

from the scattering approach at first order in the corrugation amplitude. A

variety of analytical results are derived in different limiting cases,

including the van der Waals and Casimir-Polder regimes. We compute numerically

the exact first-order dispersive potential for arbitrary separation distances

and corrugation wavelengths, for a Rubidium atom on top of a silicon or gold

corrugated surface. We discuss in detail the inadequacy of the proximity force

approximation, and present a simple but adequate approximation for computing

the potential.

\\ ( http://arxiv.org/abs/0902.3235 , 349kb)

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\\

arXiv:0902.3066

Date: Wed, 18 Feb 2009 07:53:52 GMT (42kb)

Title: Cold Atom Space Clock with Counter-Propagating Atoms

Authors: Desheng Lv, Bin Wang, Tang Li, and Liang Liu

Categories: physics.atom-ph physics.ins-det

Comments: 8 pages, 1 figure

\\

We discuss the feasibility to realize a space cold atom clock with

counter-propagating cold atoms in microgravity. The design of the space clock

is based on atomic beam clock with a Ramsey cavity, except a magneto-optical

trap (MOT) is placed at each side. Cold atoms are launched from MOTs at both

side of the clock simultaneously and move at counter-direction towards each

other. The velocity of launched atoms is precisely controlled to the

Ramsauer-Townsend resonance so that no additional collision frequency shift is

taken place. Such a configuration can efficiently cancel the frequency shift

led from cavity phase shift and increase the signal to noise.

\\ ( http://arxiv.org/abs/0902.3066 , 42kb)

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\\

arXiv:0901.1706

replaced with revised version Wed, 18 Feb 2009 09:04:18 GMT (212kb)

Title: Observation of recoil-induced resonances and electromagnetically induced

absorption of cold atoms in diffuse light

Authors: Wen-zhuo Zhang, Hua-dong Cheng, Liang Liu, and Yu-zhu Wang

Categories: physics.atom-ph physics.optics

Comments: 5 pages, 6 figures

\\ ( http://arxiv.org/abs/0901.1706 , 212kb)

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\\

arXiv:0902.3278

Date: Thu, 19 Feb 2009 00:53:39 GMT (560kb)

Title: Polarization Plateau in Atomic Fermi Gas Loaded on Triangular Optical

Lattice

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

Categories: cond-mat.str-el

\\

In order to demonstrate that atomic Fermi gas is a good experimental reality

in studying unsolved problems in frustrated interacting-spin systems, we

numerically examine the Mott core state emerged by loading two-component atomic

Fermi gases on triangular optical lattices. Consequently, we find that plateau

like structures are observable in the Mott core polarization as a function of

the population imbalance. These plateau states are caused by a flexibility that

the surrounding metallic region absorbs the excess imbalance to keep the

plateau states inside the Mott core. We also find spin patterns peculiar to the

plateau states inside the Mott core.

\\ ( http://arxiv.org/abs/0902.3278 , 560kb)

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\\

arXiv:0902.3351

Date: Thu, 19 Feb 2009 11:35:39 GMT (150kb)

Title: Dynamics of a many-particle Landau-Zener model: inverse sweep

Authors: A.P. Itin and P. T\"orm\"a

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

Comments: 3 pages. Submitted to CEWQO 2009 on 14th February

\\

We consider dynamics of a slowly time-dependent Dicke model, which represents

a many-body generalization of the Landau-Zener model. In particular, the model

describes narrow Feshbach resonance passage in an ultracold gas of Fermi atoms.

Adiabaticity is destroyed when a parameter crosses a critical value, even at

very slow sweeping rates of a parameter. The dynamics crucially depends on

direction of the sweep. We apply our recent analysis [A.P. Itin, P. Torma,

arXiv:0901.4778v1] to the "inverse" sweep through the resonance, corresponding

(in a context of Feshbach resonance passage) to dissociation of molecules. On a

level of the mean-field approximation, the dynamics is equivalent to a

molecular condensate formation from Bose atoms within a two-mode model. Mapping

the system to a Painlev\'e equation allows us to calculate deviation from

adiabaticity at very slow sweeps analytically.

\\ ( http://arxiv.org/abs/0902.3351 , 150kb)

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\\

arXiv:0902.3366

Date: Thu, 19 Feb 2009 13:29:15 GMT (1148kb)

Title: Recoil-induced subradiance in a cold atomic gas

Authors: M.M. Cola, D. Bigerni, and N. Piovella

Categories: cond-mat.other

\\

Subradiance, i.e. the cooperative inhibition of spontaneous emission by

destructive interatomic interference, can be realized in a cold atomic sample

confined in a ring cavity and lightened by a two-frequency laser. The atoms,

scattering the photons of the two laser fields into the cavity-mode, recoil and

change their momentum. Under proper conditions the atomic initial momentum

state and the first two momentum recoil states form a three-level degenerate

cascade. A stationary subradiant state is obtained after that the scattered

photons have left the cavity, leaving the atoms in a coherent superposition of

the three collective momentum states. After a semiclassical description of the

process, we calculate the quantum subradiant state and its Wigner function.

Anti-bunching and quantum correlations between the three atomic modes of the

subradiant state are demonstrated.

\\ ( http://arxiv.org/abs/0902.3366 , 1148kb)

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\\

arXiv:0902.3404

Date: Thu, 19 Feb 2009 16:37:56 GMT (1140kb)

Title: Glassy features of a Bose Glass

Authors: P. Buonsante, F. Massel, V. Penna, and A. Vezzani

Categories: cond-mat.stat-mech

Comments: 14 pages, 4 figures;

Journal-ref: Laser Physics 18 (5) (2008) 653

DOI: 10.1134/S1054660X08050174

\\

We study a two dimensionl Bose Hubbad model at a zero temperature with random

local potentials in the presence of either uniform or binary disorder. Many

low-energy metastable configurations are found with virtually the same energy

as the ground state. These are characterized by the same blotchy pattern of

the, in principle, complex nonzero local order parameter as the ground state.

Yet, unlike the ground state, each island exhibits an overall random

independent phase. The different phases in different coherent islands could

provide a further explanation for the lack of coherence observed in experiments

on Bose glasses.

\\ ( http://arxiv.org/abs/0902.3404 , 1140kb)

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\\

arXiv:0902.3406

Date: Thu, 19 Feb 2009 16:44:02 GMT (594kb)

Title: Two atomic quantum dots interacting via coupling to BECs

Authors: Anna Posazhennikova, Wolfgang Belzig

Categories: cond-mat.other

Comments: 5 pages, 7 figures

\\

We consider a system of three weakly coupled Bose-Einstein condensates and

two atomic quantum dots embedded in the barriers between the condensates. Each

dot is coupled to two neighboring condensates by optical transitions and can be

described as a two-state system, or a pseudospin 1/2. Although there is no

direct coupling between the dots, an effective interaction between the

pseudospins is induced due to their coupling to the condensate reservoirs. We

investigate this effective interaction, depending on the strengths of the

dot-condensate coupling T and the direct coupling J between the condensates. In

particular, we show that an initially ferromagnetic arrangement of the two

pseudospins stays intact even for large T/J. However, antiferromagnetically

aligned spins undergo peculiar "breathing" modes for weak coupling T/J<1, while

for strong coupling the behaviour of the spins becomes uncorrelated.

\\ ( http://arxiv.org/abs/0902.3406 , 594kb)

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\\

arXiv:0902.3410

Date: Thu, 19 Feb 2009 16:57:57 GMT (20kb)

Title: Resonant Atom-Dimer Relaxation in Ultracold Atoms

Authors: Kerstin Helfrich, H.-W. Hammer (Bonn U.)

Categories: cond-mat.other

Comments: 5 pages, 2 figures

Report-no: HISKP-TH-09/07

\\

Three-body systems with large scattering length display universal phenomena

associated with a discrete scaling symmetry. These phenomena include resonant

enhancement of three-body loss rates when an Efimov three-body resonance is at

the scattering threshold. In particular, there can be resonant peaks in the

atom-dimer relaxation rate for large positive scattering length. We improve

upon earlier studies and calculate the atom-dimer relaxation rate as a function

of temperature using a Bose-Einstein distribution for the thermal average. As

input, we use calculations of the atom-dimer scattering phase shifts from

effective field theory.

\\ ( http://arxiv.org/abs/0902.3410 , 20kb)

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\\

arXiv:0902.3421

Date: Thu, 19 Feb 2009 17:59:36 GMT (737kb)

Title: A fully quantal molecular description for the spectra of bosons and

fermions in the lowest Landau level

Authors: Constantine Yannouleas and Uzi Landman

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

Comments: REVTEX 4. 6 pages with 1 color figure and 3 Tables. For related

papers, see http://www.prism.gatech.edu/~ph274cy/

\\

Through the introduction of a class of appropriate translationally invariant

trial wave functions, we show that the strong correlations in the lowest Landau

level (LLL) reflect in finite systems the emergence of intrinsic point-group

symmetries associated with rotations and vibrations of molecules formed through

particle localization. This quantal molecular description is universal, being

valid for both bosons and fermions, for both the yrast and excited states of

the LLL spectra, and for both low and high angular momenta. "Quantum-fluid"

physical pictures associated with Jastrow-type trial functions are shown to be

reducible to the molecular description introduced in this paper.

\\ ( http://arxiv.org/abs/0902.3421 , 737kb)

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The replacements:

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arXiv:0810.0337

replaced with revised version Thu, 12 Feb 2009 21:15:03 GMT (198kb)

Title: Derivation of the fundamental equations of continuum thermodynamics from

statistical mechanics

Authors: Walter Noll

Categories: cond-mat.stat-mech

Comments: 18 page file, one figure. The submission is an English translation of

a 1955 paper published originally in German. The translation is due to

Richard B. Lehoucq and Anatole Von Lilienfeld-Toal (see the acknowledgements

appearing on the first page)

DOI: 10.1512/iumj.1955.4.54022

\\ ( http://arxiv.org/abs/0810.0337 , 198kb)

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arXiv:0807.4440

replaced with revised version Sun, 15 Feb 2009 06:26:39 GMT (330kb)

Title: Unusual decoherence in qubit measurements with a Bose-Einstein

condensate

Authors: D. Sokolovski and S.A. Gurvitz

Categories: quant-ph cond-mat.mes-hall

Comments: 5 pages, additional explanations related to experimental realization

are added, typos corrected, Phys. Rev. A, in press

\\ ( http://arxiv.org/abs/0807.4440 , 330kb)

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\\

arXiv:0812.4075

replaced with revised version Mon, 16 Feb 2009 03:16:44 GMT (462kb)

Title: Vortex sheet in rotating two-component Bose-Einstein condensates

Authors: Kenichi Kasamatsu and Makoto Tsubota

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

Comments: 8 pages, 7 figures

Journal-ref: Phys. Rev. A 79, 023606 (2009)

\\ ( http://arxiv.org/abs/0812.4075 , 462kb)

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\\

arXiv:quant-ph/0410061

replaced with revised version Sat, 14 Feb 2009 10:51:13 GMT (109kb)

Title: Quantum Mechanics

Authors: Hitoshi Kitada (University of Tokyo)

Categories: quant-ph

Comments: 168 pages, LaTeX, two idenities on pp.56-57 corrected

Report-no: KIMS-2003-12-15

Journal-ref: Lectures in Mathematical Sciences vol. 23, The University of

Tokyo, 2005, ISSN 0919-8180, ISBN 1-000-01896-2

\\ ( http://arxiv.org/abs/quant-ph/0410061 , 109kb)

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arXiv:0811.3340

replaced with revised version Mon, 16 Feb 2009 04:18:56 GMT (429kb)

Title: Steering Bose-Einstein condensates despite time symmetry

Authors: Dario Poletti, Giuliano Benenti, Giulio Casati, Peter Hanggi, Baowen

Li

Categories: physics.atom-ph

Comments: 4 pages, 5 figures

\\ ( http://arxiv.org/abs/0811.3340 , 429kb)

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\\

arXiv:0805.0847

replaced with revised version Tue, 17 Feb 2009 02:35:21 GMT (560kb)

Title: Dynamics of rotating two-component Bose-Einstein Condensates

Authors: I. Corro, R.G. Scott, and A.M. Martin

Categories: cond-mat.other quant-ph

Comments: more material added. 9 pages, 6 figures

\\ ( http://arxiv.org/abs/0805.0847 , 560kb)

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\\

arXiv:0812.2295

replaced with revised version Tue, 17 Feb 2009 13:24:15 GMT (1177kb)

Title: A two-state Raman coupler for coherent atom optics

Authors: J. E. Debs, D. D\"oring, N. P. Robins, C. Figl, P. A. Altin, J. D.

Close

Categories: physics.atom-ph

Comments: 7 Pages, 4 figures: Revised and published in Optics Express

Journal-ref: J. E. Debs, D. D\"oring, N. P. Robins, C. Figl, P. A. Altin, and

J. D. Close, "A two-state Raman coupler for coherent atom optics," Opt.

Express 17, 2319-2325 (2009)

DOI: 10.1364/OE.17.002319

\\ ( http://arxiv.org/abs/0812.2295 , 1177kb)

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arXiv:0806.0814

replaced with revised version Wed, 18 Feb 2009 13:04:14 GMT (369kb)

Title: Observation of vortex formation in an oscillating trapped Bose-Einstein

condensate

Authors: E. A. L. Henn, J. A. Seman, E. R. F. Ramos, M. Caracanhas, P.

Castilho, E. P. Olimpio, G. Roati, D. V. Magalh\~aes, K. M. F. Magalh\~aes,

V.S. Bagnato

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

Comments: text improved, figure added (total of 6), 5 pages

\\ ( http://arxiv.org/abs/0806.0814 , 369kb)

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arXiv:0902.2705

replaced with revised version Wed, 18 Feb 2009 12:45:11 GMT (336kb)

Title: Quantum correlated light pulses from sequential superradiance of a

condensate

Authors: M.E. Tasgin, M.O. Oktel, L. You, and O.E. Mustecaplioglu

Categories: cond-mat.other

Comments: 10 pages, 6 figures

\\ ( http://arxiv.org/abs/0902.2705 , 336kb)

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arXiv:0810.4499 (*cross-listing*)

replaced with revised version Wed, 18 Feb 2009 13:20:33 GMT (611kb,D)

Title: Coupled Mode Equations and Gap Solitons for the 2D Gross-Pitaevskii

equation with a non-separable periodic potential

Authors: Tom\'a\v{s} Dohnal and Hannes Uecker

Categories: nlin.PS math.AP physics.optics

Comments: 1. missing assumptions in Lemma 3.6 added; 2. Lemmas 4.2 and 4.5

added; 3. smoothness assumptions on V(x) added

\\ ( http://arxiv.org/abs/0810.4499 , 611kb)

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\\

arXiv:cond-mat/0506645

replaced with revised version Thu, 19 Feb 2009 12:31:56 GMT (589kb)

Title: The nonlinear Schroedinger equation for the delta-comb potential:

quasi-classical chaos and bifurcations of periodic stationary solutions

Authors: D. Witthaut, K. Rapedius and H. J. Korsch

Categories: cond-mat.other

Comments: Enhanced and revised version, to appear in J. Nonlin. Math. Phys

\\ ( http://arxiv.org/abs/cond-mat/0506645 , 589kb)

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\\

arXiv:0811.1188

replaced with revised version Thu, 19 Feb 2009 08:56:23 GMT (37kb)

Title: Quasiparticle excitations and dynamic susceptibilities in the BCS-BEC

crossover

Authors: J. Bauer and A.C. Hewson

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

Comments: 6 pages, 5 figures (minor amendments and additional reference)

Journal-ref: EPL 85 (2009) 27001

DOI: 10.1209/0295-5075/85/27001

\\ ( http://arxiv.org/abs/0811.1188 , 37kb)

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\\

arXiv:0811.3717

replaced with revised version Thu, 19 Feb 2009 08:31:45 GMT (72kb)

Title: Nonequilibrium fluctuations, fluctuation theorems, and counting

statistics in quantum systems

Authors: Massimiliano Esposito, Upendra Harbola and Shaul Mukamel

Categories: cond-mat.stat-mech

Comments: Accepted in Rev. Mod. Phys. v2: Some references added and typos

corrected

\\ ( http://arxiv.org/abs/0811.3717 , 72kb)

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\\

arXiv:0901.1300

replaced with revised version Thu, 19 Feb 2009 10:06:12 GMT (903kb)

Title: Coherent collapse of a dipolar Bose-Einstein condensate for different

trap geometries

Authors: J Metz, T Lahaye, B Fr\"ohlich, A Griesmaier, T Pfau, H Saito, Y

Kawaguchi, and M Ueda

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

\\ ( http://arxiv.org/abs/0901.1300 , 903kb)

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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 Tue May 19 2009 - 08:39:43 EST

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