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

Date: Tue, 18 Mar 2008 08:31:41 +1000

Date: Tue, 18 Mar 2008 08:31:41 +1000

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

Hi everyone,

A massive 36 new preprints and 15 replacements this week (well actually a couple

of weeks ago). You guys have been busy.

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arXiv:0802.4309

Date: Fri, 29 Feb 2008 00:20:01 GMT (535kb,D)

Title: Macroscopic superposition states in rotating ring lattices

Authors: Ana Maria Rey and Andreas Nunnenkamp

Categories: cond-mat.other

Comments: 8 pages, 4 figures; submitted to the PQE-2008 conference proceedings

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

\\

We investigate the effects of rotation on one-dimensional ultracold bosons

confined to optical ring lattices. First, we consider a uniform lattice and

show that there exists a critical rotation frequency at which the ground state

of a weakly-interacting and integer-filled atomic gas is fragmented into a

macroscopic superposition of two states with different circulation. Second, we

point out several advantages of slightly non-uniform ring lattices for the

generation of such kind of states. Finally, we demonstrate that different

quasi-momentum states can be distinguished in time-of-flight absorption imaging

and propose to probe correlations via the many-body oscillations induced by a

sudden change in the rotation frequency.

\\ ( http://arxiv.org/abs/0802.4309 , 535kb)

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arXiv:0802.4321

Date: Fri, 29 Feb 2008 04:31:25 GMT (240kb)

Title: Bright solitary waves of atomic Bose-Einstein condensates under rotation

Authors: N.A. Jamaludin, N.G. Parker and A.M. Martin

Categories: cond-mat.other

Comments: 4 pages, 3 figures

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

\\

We analyse the rotation of bright solitary waves formed of atomic

Bose-Einstein condensates with attractive atomic interactions. By employing a

variational technique and assuming an irrotational quadrupolar flow field, we

map out the variational solutions in the rotating frame. In particular, we show

that rotation has a considerable stabilising effect on the system,

significantly raising the critical threshold for collapse of the bright

solitary waves.

\\ ( http://arxiv.org/abs/0802.4321 , 240kb)

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arXiv:0802.4366

Date: Fri, 29 Feb 2008 11:39:46 GMT (205kb)

Title: Anisotropic scattering of Bogoliubov excitations

Authors: Christopher Gaul and Cord Axel M\"uller

Categories: cond-mat.other

Comments: 5 pages, 5 figures

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

\\

We investigate the interplay of disorder and interaction in 2D Bose-Einstein

condensates by studying the scattering of Bogoliubov excitations on spatial

fluctuations of an external optical potential. A numerical integration of the

Gross-Pitaevskii equation shows that the single-scattering amplitude has a

marked angular anisotropy. By a saddle-point expansion of the hydrodynamic

mean-field energy functional, we derive the relevant scattering amplitude

including the crossover from sound-like to particle-like excitations. The very

different scattering properties of these limiting cases are smoothly connected

by an angular envelope function with a well-defined node of vanishing

scattering amplitude. We find that the overall scattering is most efficient at

the crossover from phonon-like to particle-like Bogoliubov excitations.

\\ ( http://arxiv.org/abs/0802.4366 , 205kb)

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arXiv:0802.4440

Date: Fri, 29 Feb 2008 17:57:59 GMT (926kb)

Title: Imbalanced d-wave superfluids in the BCS-BEC crossover regime at finite

temperatures

Authors: J. Tempere, S.N. Klimin, J.T. Devreese, V.V. Moshchalkov

Categories: cond-mat.supr-con

Comments: 22 pages, 7 figures

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

\\

Singlet pairing in a Fermi superfluid is frustrated when the amounts of

fermions of each pairing partner are unequal. The resulting `imbalanced

superfluid' has been realized experimentally for ultracold atomic gases with

s-wave interactions. Inspired by high-temperature superconductivity, we

investigate the case of d-wave interactions, and find marked differences from

the s-wave superfluid. Whereas s-wave imbalanced Fermi gases tend to phase

separate in real space, in a balanced condensate and an imbalanced normal halo,

we show that the d-wave gas can phase separate in reciprocal space so that

imbalance and superfluidity can coexist spatially. We show that the mechanism

explaining this property is the creation of polarized excitations in the nodes

of the gap. The Sarma mechanism, present only at nonzero temperatures for the

s-wave case, is still applicable in the temperature zero limit for the d-wave

case. As a result, the d-wave BCS superfluid is more robust with respect to

imbalance, and a region of the phase diagram can be identified where the s-wave

BCS superfluidity is suppressed whereas the d-wave superfluidity is not. When

these results are extended into the BEC limit of strongly bound molecules, the

symmetry of the order parameter matters less. The effects of fluctuations

beyond mean field is taken into account in the calculation of the structure

factor and the critical temperature. The poles of the structure factor

(corresponding to bound molecular states) are less damped in the d-wave case as

compared to s-wave. On the BCS side of the unitarity limit, the critical

temperature follows the temperature corresponding to the pair binding energy

and as such will also be more robust against imbalance. Possible routes for the

experimental observation of the d-wave superfluidity have been discussed.

\\ ( http://arxiv.org/abs/0802.4440 , 926kb)

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arXiv:0802.4276 (*cross-listing*)

Date: Thu, 28 Feb 2008 20:14:54 GMT (68kb)

Title: Fermion- and Spin-Counting in Strongly Correlated Systems

Authors: Sibylle Braungardt, Aditi Sen De, Ujjwal Sen, Roy J. Glauber, Maciej

Lewenstein

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

Comments: 8 pages, 7 figures, RevTeX4

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

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We apply the atom counting theory to strongly correlated Fermi systems and

spin models, which can be realized with ultracold atoms. The counting

distributions are typically sub-Poissonian and remain smooth at quantum phase

transitions, but their moments exhibit critical behavior, and characterize

quantum statistical properties of the system. Moreover, more detailed

characterizations are obtained with experimentally feasible spatially resolved

counting distributions.

\\ ( http://arxiv.org/abs/0802.4276 , 68kb)

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arXiv:0802.4314

Date: Fri, 29 Feb 2008 01:13:16 GMT (468kb)

Title: Identifying phases of matter that are universal for quantum computation

Authors: Andrew C. Doherty and Stephen D. Bartlett

Categories: quant-ph

Comments: 5 pages, 2 figures, comments welcome

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

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A recent breakthrough in quantum computing has been the realization that

quantum computation can proceed solely through single-qubit measurements on an

appropriate quantum state - for example, the ground state of an interacting

many-body system. It would be unfortunate, however, if the usefulness of a

ground state for quantum computation was critically dependent on the details of

the system's Hamiltonian; a much more powerful result would be the existence of

a robust ordered phase which is characterized by the ability to perform

measurement-based quantum computation (MBQC). To identify such phases, we

propose to use nonlocal correlation functions that quantify the fidelity of

quantum gates performed between distant qubits. We investigate a simple

spin-lattice system based on the cluster-state model for MBQC, and demonstrate

that it possesses a zero temperature phase transition between a disordered

phase and an ordered "cluster phase" in which it is possible to perform a

universal set of quantum gates.

\\ ( http://arxiv.org/abs/0802.4314 , 468kb)

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arXiv:0802.4355

Date: Fri, 29 Feb 2008 10:51:18 GMT (657kb)

Title: Multi-Cell Traps for Registering of Cold Atom Clouds

Authors: G.A. Kouzaev and K.J. Sand

Categories: quant-ph

Comments: 6 pages, 6 figures

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

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In this letter, the results on the development and simulation of new

three-dimensional nanotraps for cold dressed atoms are considered. The traps

are the multi-cell structures built by crossed non-touching carbon nanotubes.

The trapping effect is tuned by the DC and RF currents to confine the strong-

or low-potential seeking atoms far enough from the areas of strong

Casimir-Polder and spin-flip forces. It is supposed that the developed and

simulated multi-cell structures are pertinent for catching the Bose-Einstein

condensates to demonstrate the Josephson effect, and to enable the study of the

entanglement of confined clouds in three-dimensional nano-cells.

\\ ( http://arxiv.org/abs/0802.4355 , 657kb)

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arXiv:0802.4362

Date: Fri, 29 Feb 2008 15:50:02 GMT (703kb)

Title: Quantum reflection of bright matter-wave solitons

Authors: S. L. Cornish, N. G. Parker, A. M. Martin, T. E. Judd, R. G. Scott, T.

M. Fromhold and C. S. Adams

Categories: quant-ph

Comments: 10 pages, 6 figures. Submitted to special issue of Physica D on

"Nonlinear dynamics in degenerate quantum gases"

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

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We propose the use of bright matter-wave solitons formed from Bose-Einstein

condensates with attractive interactions to probe and study quantum reflection

from a solid surface at normal incidence. We demonstrate that the presence of

attractive interatomic interactions leads to a number of advantages for the

study of quantum reflection. The absence of dispersion as the soliton

propagates allows precise control of the velocity normal to the surface and for

much lower velocities to be achieved. Numerical modelling shows that the

robust, self-trapped nature of bright solitons leads to a clean reflection from

the surface, limiting the disruption of the density profile and permitting

accurate measurements of the reflection probability.

\\ ( http://arxiv.org/abs/0802.4362 , 703kb)

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arXiv:0802.4406

Date: Fri, 29 Feb 2008 14:46:16 GMT (459kb,D)

Title: Holographic quantum computing

Authors: Karl Tordrup, Antonio Negretti, and Klaus Molmer

Categories: quant-ph

Comments: 4 pages, 3 figures

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

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We propose that a single mesoscopic ensemble of trapped polar molecules can

support a "holographic quantum computer" with hundreds of qubits encoded in

collective excitations with definite spatial phase variations. Each phase

pattern is uniquely addressed by optical Raman processes with classical optical

fields, while one- and two-qubit gates are accomplished by selectively

transferring the individual qubit states to a stripline microwave cavity field

and a Cooper pair box where controllable two-level unitary dynamics is governed

by classical microwave fields.

\\ ( http://arxiv.org/abs/0802.4406 , 459kb)

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arXiv:0803.0239

Date: Mon, 3 Mar 2008 13:38:21 GMT (21kb)

Title: Resonant spin-changing collisions in spinor Fermi gases

Authors: N. Bornemann, P. Hyllus and L. Santos

Categories: cond-mat.other

Comments: 4 pages, 3 eps figures

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

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Spin-changing collisions in trapped Fermi gases may acquire a resonant

character due to the compensation of quadratic Zeeman effect and trap energy.

These resonances are absent in spinor condensates and pseudo-spin-1/2 Fermi

gases, being a characteristic feature of high-spin Fermi gases that allows

spinor physics at large magnetic fields. We analyze these resonances in detail

for the case of lattice spinor fermions, showing that they permit to

selectively target a spin-changing channel while suppressing all others. These

resonances allow for the controlled creation of non-trivial quantum

superpositions of many-particle states with entangled spin and trap degrees of

freedom, which remarkably are magnetic-field insensitive. Finally, we show that

the intersite tunneling may lead to a quantum phase transition described by an

effective quantum Ising model.

\\ ( http://arxiv.org/abs/0803.0239 , 21kb)

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arXiv:0803.0245

Date: Mon, 3 Mar 2008 14:08:04 GMT (134kb)

Title: Quantum Phase Analysis of Extended Bose-Hubbard Model

Authors: Manoranjan Kumar, Sujit Sarkar, S. Ramasesha

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

Comments: 4 pages, 5 figures

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

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We have obtained the quantum phase diagram of one dimensional extended

Bose-Hubbard model using the density-matrix renormalization group and Abelian

bosonization methods for different commensurabilities. We describe the nature

of different quantum phases at the charge degeneracy point. We find a direct

phase transition from Mott insulating phase to superconducting phase for

integer band fillings of bosons. We predict explicitly the presence of two

kinds of repulsive Luttinger liquid phases, apart from the charge density wave

and superconducting phases for half-integer band fillings. Our study reveals

that extended range interactions are necessary to get the correct phase

boundary of an one-dimensional interacting bosons system.

\\ ( http://arxiv.org/abs/0803.0245 , 134kb)

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arXiv:0803.0059

Date: Sat, 1 Mar 2008 11:13:43 GMT (454kb)

Title: Probing Mott lobes via the AC Josephson effect

Authors: M.X. Huo, Ying Li, Z. Song and C.P. Sun

Categories: quant-ph

Comments: 5 pages, 4 figures

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

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The alternating-current (AC) Josephson effect is studied in a system

consisting of two weakly coupled Bose Hubbard models. In the framework of the

mean field theory, Gross-Pitaevskii equations show that the amplitude of the

Josephson current is proportional to the product of superfluid order

parameters. In addition, the chemical potential--current relation for a small

size system is obtained via the exact numerical computation. This allows us to

propose a feasible experimental scheme to measure the Mott lobes of the quantum

phase transition.

\\ ( http://arxiv.org/abs/0803.0059 , 454kb)

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arXiv:0803.0110

Date: Sun, 2 Mar 2008 09:27:33 GMT (484kb,D)

Title: A novel scheme for entanglement engineering in a fermionic system

Authors: Jiming Gao, Jiaxiang Wang

Categories: quant-ph

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

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We present a novel scheme to engineer the entanglement in a fermionic system,

which is modeled by a minimally three-site Hubbard model. It is found that, in

this type of system, we can have two free parameters. One is used to tune the

entanglement and the other to switch on or off the above tuning function. The

whole process is much like what happens in a traditional transistor switch,

where the main current between the emitter and collector can be turned on or

off by the base current.

\\ ( http://arxiv.org/abs/0803.0110 , 484kb)

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arXiv:0803.0155

Date: Sun, 2 Mar 2008 23:35:35 GMT (92kb)

Title: Sub-Shot-Noise Quantum Optical Interferometry: A Comparison of Entangled

State Performance within a Unified Measurement Scheme

Authors: Yang Gao and Hwang Lee

Categories: quant-ph

Comments: 5 pages, 2 figures

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

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Phase measurement using a lossless Mach-Zehnder interferometer with certain

entangled $N$-photon states can lead to a phase sensitivity of the order of

1/N, the Heisenberg limit. However, previously considered output measurement

schemes are different for different input states to achieve this limit. We show

that it is possible to achieve this limit just by the parity measurement for

all the commonly proposed entangled states. Based on the parity measurement

scheme, the reductions of the phase sensitivity in the presence of photon loss

are examined for the various input states.

\\ ( http://arxiv.org/abs/0803.0155 , 92kb)

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arXiv:0803.0183

Date: Mon, 3 Mar 2008 20:02:00 GMT (318kb)

Title: Optimal control of atom transport for quantum gates in optical lattices

Authors: G. De Chiara, T. Calarco, M. Anderlini, S. Montangero, P. J. Lee, B.

L. Brown, W. D. Phillips, and J. V. Porto

Categories: quant-ph

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

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By means of optimal control techniques we model and optimize the manipulation

of the external quantum state (center-of-mass motion) of atoms trapped in

adjustable optical potentials. We consider in detail the cases of both non

interacting and interacting atoms moving between neighboring sites in a lattice

of a double-well optical potentials. Such a lattice can perform

interaction-mediated entanglement of atom pairs and can realize two-qubit

quantum gates. The optimized control sequences for the optical potential allow

transport faster and with significantly larger fidelity than is possible with

processes based on adiabatic transport.

\\ ( http://arxiv.org/abs/0803.0183 , 318kb)

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arXiv:0803.0201

Date: Mon, 3 Mar 2008 12:55:46 GMT (246kb)

Title: F-resolved Magneto-optical Resonances at D1 Excitation of Cesium:

Experiment and Theory

Authors: Marcis Auzinsh, Ruvin Ferber, Florian Gahbauer, Andrey Jarmola, and

Linards Kalvans

Categories: physics.atom-ph

Comments: 9 pages, 6 figures

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

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Bright and dark nonlinear magneto-optical resonances associated with the

ground state Hanle effect have been studied experimentally and theoretically

for D1 excitation of atomic cesium. This system offers the advantage that the

separation between the different hyperfine levels exceeds the Doppler width,

and, hence, transitions between individual levels can be studied separately.

Experimental measurements for various laser power densities and transit

relaxation times are compared with a model based on the optical Bloch

equations, which averages over the Doppler contour of the absorption line and

simultaneously takes into account all hyperfine levels, as well as mixing of

magnetic sublevels in an external magnetic field. In contrast to previous

studies, which could not resolve the hyperfine transitions because of Doppler

broadening, in this study there is excellent agreement between experiment and

theory regarding the sign (bright or dark), contrast, and width of the

resonance. The results support the traditional theoretical interpretation,

according to which these effects are related to the relative strengths of

transition probabilities between different magnetic sublevels in a given

hyperfine transition.

\\ ( http://arxiv.org/abs/0803.0201 , 246kb)

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arXiv:0803.0340

Date: Mon, 3 Mar 2008 22:46:45 GMT (467kb)

Title: Dynamical Creation of Fractionalized Vortices and Vortex Lattices

Authors: An-Chun Ji, W. M. Liu (CAS), Jun Liang Song and Fei Zhou (UBC)

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

Comments: 5 pages, 3 figures

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

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We investigate dynamic creation of fractionalized half-quantum vortices in

Bose-Einstein condensates of sodium atoms. Our simulations show that both

individual half-quantum vortices and vortex lattices can be created in rotating

optical traps when additional pulsed magnetic trapping potentials are applied.

We also find that a distinct periodically modulated spin-density-wave spatial

structure is always embedded in square half-quantum vortex lattices; this

structure can be conveniently probed by taking absorption images of

ballistically expanding cold atoms in a Stern-Gerlach field.

\\ ( http://arxiv.org/abs/0803.0340 , 467kb)

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arXiv:0803.0507

Date: Tue, 4 Mar 2008 18:17:59 GMT (593kb,D)

Title: Numerical observation of Hawking radiation from acoustic black holes in

atomic BECs

Authors: Iacopo Carusotto, Serena Fagnocchi, Alessio Recati, Roberto Balbinot,

Alessandro Fabbri

Categories: cond-mat.other gr-qc

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

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We report numerical evidence of Hawking emission of Bogoliubov phonons from a

sonic horizon in a flowing one-dimensional atomic Bose-Einstein condensate. The

presence of Hawking radiation is revealed from peculiar long-range patterns in

the density-density correlation function of the gas. Quantitative agreement

between our fully microscopic calculations and the prediction of analog models

is obtained in the hydrodynamic limit. New features are predicted and the

effect of a finite initial temperature discussed.

\\ ( http://arxiv.org/abs/0803.0507 , 593kb)

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arXiv:0803.0546

Date: Tue, 4 Mar 2008 21:01:25 GMT (158kb)

Title: Influence of the trap shape on the superfluid-Mott transition in

ultracold atomic gases

Authors: Ping Nang Ma, Kai Yu Yang, Lode Pollet, J. V. Porto, Matthias Troyer,

Fu Chun Zhang

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

Comments: 5 pages, 6 figures

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

\\

The coexistence of superfluid and Mott insulator, due to the quadratic

confinement potential in current optical lattice experiments, makes the

accurate detection of the superfluid-Mott transition difficult. Studying

alternative trapping potentials which are experimentally realizable and have a

flatter center, we find that the transition can be better resolved, but at the

cost of a more difficult tuning of the particle filling. When mapping out the

phase diagram using local probes and the local density approximation we find

that the smoother gradient of the parabolic trap is advantageous.

\\ ( http://arxiv.org/abs/0803.0546 , 158kb)

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arXiv:0803.0559

Date: Tue, 4 Mar 2008 22:08:15 GMT (511kb)

Title: Simulation of an inhomogeneous Fermi gas through the BCS-BEC crossover

Authors: R. Jauregui, R. Paredes, L. Rosales-Zarate, and G. Toledo Sanchez

Categories: cond-mat.other

Comments: 14 pages,8 figures

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

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We perform a variational quantum Monte Carlo simulation of the transition

from a Bose-Einstein condensate (BEC) to a Bardeen-Cooper-Schrieffer superfluid

(BCS) at zero temperature. The model Hamiltonian involves an attractive short

range two body interaction and the atoms number $2N =330$ is chosen so that, in

the non-interacting limit, the ground state function corresponds to a closed

shell configuration. The system is then characterized by the $s$-wave

scattering length $a$ of the two-particle collisions in the gas, which is

varied from negative to positive values, and the Fermi wave number $k_F$. Based

on an exhaustive analysis of the two-body problem, one parameter variational

many-body wave functions are proposed to describe the ground state of the

interacting Fermi gas from BCS to BEC states. We exploit properties of

antisymmetrized many-body functions to develop efficient techniques that permit

variational calculations for a large number of particles. It is shown that a

virial relation between the energy per particle and the trapping energy is

approximately valid for $-0.1<1/k_Fa<1.4$. The influence of the harmonic trap

and the interaction potential as exhibited in two-body correlation functions is

also analyzed.

\\ ( http://arxiv.org/abs/0803.0559 , 511kb)

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arXiv:0803.0651

Date: Wed, 5 Mar 2008 13:13:23 GMT (120kb)

Title: Accurate near-threshold model for ultracold KRb dimers from interisotope

Feshbach spectroscopy

Authors: A. Simoni, M. Zaccanti, C. D'Errico, M. Fattori, G. Roati, M.

Inguscio, G. Modugno

Categories: cond-mat.other

Comments: 9 pages, 7 figures

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

\\

We investigate magnetic Feshbach resonances in two different ultracold K-Rb

mixtures. Information on the K(39)-Rb(87) isotopic pair is combined with novel

and pre-existing observations of resonance patterns for K(40)-Rb(87).

Interisotope resonance spectroscopy improves significantly our near-threshold

model for scattering and bound-state calculations. Our analysis determines the

number of bound states in singlet/triplet potentials and establishes precisely

near threshold parameters for all K-Rb pairs of interest for experiments with

both atoms and molecules. In addition, the model verifies the validity of the

Born-Oppenheimer approximation at the present level of accuracy.

\\ ( http://arxiv.org/abs/0803.0651 , 120kb)

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arXiv:0803.0683

Date: Wed, 5 Mar 2008 16:16:43 GMT (112kb)

Title: Real space Bogolubov-de Gennes equations study of the boson-fermion

model

Authors: Jaromir Krzyszczak, Tadeusz Doma\'nski, Karol I. Wysoki\'nski

Categories: cond-mat.supr-con

Comments: 5 pages with 5 Postscript figures, presented at 13 Krajowa Szkola

Nadprzewodnictwa (Ladek-Zdroj 2007), will be published in APP-A, uses

appolb.cls

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

\\

The boson-fermion (BF) model has been proposed to describe superconductivity

in short coherence length superconductors. In this work we use it to study

impurity induced inhomogeneities in high temperature superconductors (HTS) as

found in numerous scanning tunnelling measurements. The model has been

formulated in real space and solved with help of Bogolubov-de Gennes approach.

Disorder in the boson or fermion subsystem is directly coupled to the

superconducting order parameter and leads to severe changes of superconducting

properties like local order parameter and density of states. We present the

results for many impurities randomly distributed over otherwise clean and

periodic two-dimensional square lattice.

\\ ( http://arxiv.org/abs/0803.0683 , 112kb)

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arXiv:0803.0733

Date: Wed, 5 Mar 2008 19:14:52 GMT (139kb)

Title: Theoretical Investigation of Fermion Pairings in Three-band Extended

Hubbard Model

Authors: Partha Goswami

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

Comments: 22pages,No figures

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

\\

The two-dimensional d-p model (or extended Hubbard model) on a square lattice

is investigated for fermion pairing by a slave boson method. The inter-site

d-fermion interaction is introduced additionally. The momentum space

counterpart of this interaction is taken to be separable and expanded in terms

of basis functions corresponding to mixed symmetry states. The investigation

leads to anomalous pairing of fermion fields only for pure d-wave symmetry. The

charge and spin ordering gaps appear in the single- particle spectrum when

d(x,y) state is taken into account.The non-Fermi liquid behavior is found to be

the prevalent one generally. The study yields a good qualitative account of the

nodal-antinodal dichotomy. Two gaps appear in the normal state spectrum; the

larger one corresponds to the sum and the smaller to the difference of spin and

charge ordering gaps. This two-gap scenario is in qualitative agreement with

recent experimental finding.

\\ ( http://arxiv.org/abs/0803.0733 , 139kb)

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arXiv:0803.0282 (*cross-listing*)

Date: Mon, 3 Mar 2008 16:51:51 GMT (167kb)

Title: On a new definition of quantum entropy

Authors: Michele Campisi

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

Comments: 4 pages, 3 figures

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

\\

It is proved here that, as a consequence of the unitary quantum evolution,

the expectation value of a properly defined quantum entropy operator (as

opposed to the non-evolving von Neumann entropy) can only increase during non

adiabatic transformations and remains constant during adiabatic ones. Thus

Clausius formulation of the second law is established as a theorem in quantum

mechanics, in a way that is equivalent to the previously established

formulation in terms of minimal work principle [A. E. Allahverdyan and T. M.

Nieuwenhuizen, Phys. Rev. E 71, 046107 (2005)]. The corresponding Quantum

Mechanical Principle of Entropy Increase is then illustrated with an exactly

solvable example, namely the driven harmonic oscillator. Attention is paid to

both microcanonical and canonical initial condition. The results are compared

to their classical counterparts.

\\ ( http://arxiv.org/abs/0803.0282 , 167kb)

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arXiv:0803.0617

Date: Wed, 5 Mar 2008 10:02:53 GMT (519kb)

Title: Quantum dynamics of one and two bosonic atoms in a combined

tight-binding periodic and weak parabolic potential

Authors: Manuel Valiente and David Petrosyan

Categories: quant-ph

Comments: 6 pages, 6 figures

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

\\

Strongly interacting bosonic particles in a tight-binding periodic potential

superimposed by a weak parabolic trap is a paradigm for many cold atom

experiments. Here, after revisiting the single particle problem, we study

interaction-bound dimers of bosonic atoms in the combined lattice and parabolic

potential. We consider both repulsively- and attractively-bound dimers and find

pronounced differences in their behaviour. We identify conditions under which

attractive and repulsive dimers exhibit analogous dynamics. Our studies reveal

that coherent transport and periodic oscillations of appropriately prepared

one- and two-atom wavepackets can be achieved, which may facilitate information

transfer in optical lattice based quantum computation schemes.

\\ ( http://arxiv.org/abs/0803.0617 , 519kb)

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arXiv:0803.0650

Date: Wed, 5 Mar 2008 13:01:29 GMT (859kb,D)

Title: Alternating gradient focusing and deceleration of large molecules

Authors: Kirstin Wohlfart, Fabian Gr\"atz, Frank Filsinger, Henrik Haak, Gerard

Meijer, and Jochen K\"upper

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

Comments: 5 pages, 4 figures, revtex4

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

\\

We have focused and decelerated benzonitrile (C$_7$H$_5$N) molecules from a

molecular beam, using an array of time-varying inhomogeneous electric fields in

alternating gradient configuration. Benzonitrile is prototypical for large

asymmetric top molecules that exhibit rich rotational structure and a high

density of states. At the rotational temperature of 3.5 K in the pulsed

molecular beam, many rotational states are populated. Benzonitrile molecules in

their absolute ground state are decelerated from 320 m/s to 289 m/s, and

similar changes in velocity are obtained for excited rotational states. All

measurements agree well with the outcome of trajectory calculations. These

experiments demonstrate that such large polyatomic molecules are amenable to

the powerful method of Stark deceleration.

\\ ( http://arxiv.org/abs/0803.0650 , 859kb)

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\\

arXiv:0803.0841

Date: Thu, 6 Mar 2008 11:55:55 GMT (5kb)

Title: Generalized Virial Theorem and Pressure Relation for a strongly

correlated Fermi gas

Authors: Shina Tan

Categories: cond-mat.stat-mech

Comments: 5 pages

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

\\

For a two-component Fermi gas in the unitarity limit (ie, with infinite

scattering length), there is a well-known virial theorem, first shown by J. E.

Thomas et al, Phys. Rev. Lett. 95, 120402 (2005). A few people rederived this

result, and extended it to few-body systems, but their results are all

restricted to the unitarity limit. Here I show that there is a generalized

virial theorem for FINITE scattering lengths. I also generalize an exact result

concerning the pressure, first shown in cond-mat/0508320, to the case of

imbalanced populations.

\\ ( http://arxiv.org/abs/0803.0841 , 5kb)

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arXiv:0803.0846

Date: Thu, 6 Mar 2008 12:33:03 GMT (520kb)

Title: Ground State Properties of a Tonks-Girardeau Gas in a Split Trap

Authors: J. Goold and Th. Busch

Categories: cond-mat.other

Comments: 7 pages, 9 figures

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

\\

We determine the exact many-body properties of a bosonic Tonks-Girardeau gas

confined in a harmonic potential with a tunable $\delta$-function barrier at

the trap center. This is done by calculating the reduced single particle

density matrix, the pair-distribution function, and momentum distribution of

the gas as a function of barrier strength and particle number. With increasing

barrier height we find that the ground state occupation in a diagonal basis

diverges from the $\sqrt N$ behavior that is expected for the case of a simple

harmonic trap. In fact, the scaling of the occupation number depends on whether

one has an even or odd number of particles. Since this quantity is a measure of

the coherence of our sample we show how the odd-even effect manifests itself in

both the momentum distribution of the Bose gas and interference fringe

visibility during free temporal evolution.

\\ ( http://arxiv.org/abs/0803.0846 , 520kb)

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\\

arXiv:0803.0884

Date: Thu, 6 Mar 2008 15:10:05 GMT (16kb)

Title: Condensation of Classical Nonlinear Waves in a Two-Component System

Authors: Hayder Salman and Natalia G. Berloff

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

Comments: 4 pages, 1 figure

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

\\

We study the formation of large-scale coherent structures (a condensate) for

a system of two weakly interacting classical waves. Using the coupled

defocusing nonlinear Schr\"odinger (NLS) equations as a representative model,

we focus on condensation in the phase mixing regime. We employ weak turbulence

theory to provide a complete thermodynamic description of the classical

condensation process. We show that the temperature and the condensate mass

fractions are fully determined by the total number of particles in each

component and the initial total energy. Moreover, we find that, at higher

energies, condensation can occur in only one component. The theory presented

provides excellent agreement with results of numerical simulations obtained by

directly integrating the dynamical model.

\\ ( http://arxiv.org/abs/0803.0884 , 16kb)

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arXiv:0803.0760

Date: Wed, 5 Mar 2008 23:33:29 GMT (306kb,D)

Title: Phase transitions, entanglement and quantum noise interferometry in cold

atoms

Authors: Florian Mintert, Ana Maria Rey, Indubala I. Satija, Charles W. Clark

Categories: quant-ph

Comments: 4 pages 4 figures

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

\\

We show that entanglement monotones can characterize the pronounced

enhancement of entanglement at a quantum phase transition if they are sensitive

to long-range high order correlations. These monotones are found to develop a

sharp peak at the critical point and to exhibit universal scaling. We

demonstrate that similar features are shared by noise correlations and verify

that these experimentally accessible quantities indeed encode entanglement

information and probe separability.

\\ ( http://arxiv.org/abs/0803.0760 , 306kb)

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\\

arXiv:0803.0769

Date: Thu, 6 Mar 2008 00:18:44 GMT (117kb)

Title: Entanglement in a hardcore-boson Hubbard model

Authors: Xiang Hao, Shiqun Zhu

Categories: quant-ph

Comments: 10 pages, 3 figures

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

\\

The entanglement in a Hubbard chain of hardcore bosons is investigated. The

analytic expression of the global entanglement in ground state is derived. The

divergence of the derivative of the global entanglement shows the quantum

criticality of the ground state. For the thermal equilibrium state, the

bipartite and the multipartite entanglement are evaluated. The entanglement

decreases to zero at a certain temperature. The thermal entanglement is rapidly

decreasing with the increase of the number of sites in the lattice. The

bipartite thermal entanglement approaches a constant value at a certain number

of sites while the multipartite entanglement eventually vanishes.

\\ ( http://arxiv.org/abs/0803.0769 , 117kb)

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\\

arXiv:0803.0791

Date: Thu, 6 Mar 2008 04:56:45 GMT (19kb)

Title: Stimulated Raman adiabatic passage in a multi-level atom

Authors: A. D. Boozer

Categories: quant-ph

Comments: 14 pages, 2 figures

Journal-ref: Phys. Rev. A 77, 023411 (2008)

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

\\

We present a general formalism for describing stimulated Raman adiabatic

passage in a multi-level atom. The atom is assumed to have two ground state

manifolds a and b and an excited state manifold e, and the adiabatic passage is

carried out by resonantly driving the a-e and b-e transitions with

time-dependent fields. Our formalism gives a complete description of the

adiabatic passage process, and can be applied to systems with arbitrary numbers

of degenerate states in each manifold and arbitrary couplings of the a-e and

b-e transitions. We illustrate the formalism by applying it to both a simple

toy model and to adiabatic passage in the Cesium atom.

\\ ( http://arxiv.org/abs/0803.0791 , 19kb)

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\\

arXiv:0803.0890

Date: Thu, 6 Mar 2008 15:29:45 GMT (342kb)

Title: Locality of dynamics in general harmonic quantum systems

Authors: M. Cramer, A. Serafini, J. Eisert

Categories: quant-ph

Comments: 19 pages latex, contribution to proceedings of "Quantum Information

and Many-Body Quantum Systems" Workshop, 26-31 Mar 2007, Pisa

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

\\

The Lieb-Robinson theorem states that locality is approximately preserved in

the dynamics of quantum lattice systems. Whenever one has finite-dimensional

constituents, observables evolving in time under a local Hamiltonian will

essentially grow linearly in their support, up to exponentially suppressed

corrections. In this work, we formulate Lieb-Robinson bounds for general

harmonic systems on general lattices, for which the constituents are

infinite-dimensional, as systems representing discrete versions of free fields

or the harmonic approximation to the Bose-Hubbard model. We consider both local

interactions as well as infinite-ranged interactions, showing how corrections

to locality are inherited from the locality of the Hamiltonian: Local

interactions result in stronger than exponentially suppressed corrections,

while non-local algebraic interactions result in algebraic suppression. We

derive bounds for canonical operators, Weyl operators and outline

generalization to arbitrary operators. As an example, we discuss the

Klein-Gordon field, and see how the approximate locality in the lattice model

becomes the exact causality in the field limit. We discuss the applicability of

these results to quenched lattice systems far from equilibrium, and the

dynamics of quantum phase transitions.

\\ ( http://arxiv.org/abs/0803.0890 , 342kb)

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\\

arXiv:0803.0790

Date: Thu, 6 Mar 2008 04:48:16 GMT (254kb)

Title: Proposing for decelerating a cw filtering out molecular beam with a

quasi-cw semi-Gaussian laser beam

Authors: Yaling Yin, Yong Xia, and Jianping Yin

Categories: physics.atom-ph

Comments: 14 pages, 4 figures

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

\\

We propose a promising scheme to decelerate a cw filtering out molecular beam

using a red-detuned quasi-cw semi-Gaussian laser beam. By using Monte-Carlo

simulation method, we demonstrate this optical Stark deceleration scheme, and

study its decelerated dynamic process for a cw ND3 molecular beam as well as

the dependence of the deceleration effect on the border width of the

semi-Gaussian beam. Our study shows that the proposed scheme can be used to

efficiently slow a cw ND3 molecular beam, and obtain a relative average

kinetic-energy loss of 9.33% by using a single semi-Gaussian beam with a well

depth of 7.3 mK.

\\ ( http://arxiv.org/abs/0803.0790 , 254kb)

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\\

arXiv:0803.0940

Date: Thu, 6 Mar 2008 19:13:16 GMT (321kb)

Title: A Smooth, Inductively Coupled Ring Trap for Atoms

Authors: P. F. Griffin, E. Riis, and A. S. Arnold

Categories: physics.atom-ph

Comments: 4 pages, 5 figures

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

\\

We propose and numerically investigate a scalable ring trap for cold atoms

that surmounts problems of roughness of the potential and end--effects of trap

wires. A stable trapping potential is formed about an electrically isolated,

conducting loop in an ac magnetic field by time averaging the superposition of

the external and induced magnetic fields. We investigate the use of additional

fields to eliminate Majorana spin flip losses and to create novel trapping

geometries. The possibility of micro--fabrication of these ring traps offers

the prospect of developing Sagnac atom interferometry in atom--chip devices.

\\ ( http://arxiv.org/abs/0803.0940 , 321kb)

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\\

arXiv:0803.0967

Date: Thu, 6 Mar 2008 20:26:41 GMT (991kb,D)

Title: Preparation and manipulation of molecules for fundamental physics tests

Authors: M.R. Tarbutt, J.J. Hudson, B.E. Sauer, and E.A. Hinds

Categories: physics.atom-ph

Comments: 22 pages, 18 figures

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

\\

This paper is a chapter from an upcoming book on cold molecule physics. In it

we describe techniques for the preparation and manipulation of cold molecules.

We further describe techniques for applying said cold molecules to tests of

fundamental physics.

\\ ( http://arxiv.org/abs/0803.0967 , 991kb)

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The replacements:

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arXiv:cond-mat/0702669

replaced with revised version Fri, 29 Feb 2008 03:35:49 GMT (14kb)

Title: On the Hydrodynamic Boundary Condition for Superfluid Flow

Authors: Yves Pomeau and David C. Roberts

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

Comments: Accepted to Phys. Rev. B. v2: greatly expanded discussion; clarified

unclear areas and corrected misleading statements

\\ ( http://arxiv.org/abs/cond-mat/0702669 , 14kb)

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\\

arXiv:0705.1661

replaced with revised version Fri, 29 Feb 2008 15:16:54 GMT (87kb)

Title: Functional renormalization for quantum phase transitions with

non-relativistic bosons

Authors: C.Wetterich

Categories: cond-mat.supr-con astro-ph cond-mat.str-el hep-th

Comments: 31 pages, new references

\\ ( http://arxiv.org/abs/0705.1661 , 87kb)

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\\

arXiv:0710.4052

replaced with revised version Fri, 29 Feb 2008 20:29:33 GMT (313kb)

Title: Metastable Feshbach Molecules in High Rotational States

Authors: S. Knoop, M. Mark, F. Ferlaino, J.G. Danzl, T. Kraemer, H.-C. Naegerl,

R. Grimm

Categories: cond-mat.other

Comments: 4 pages, 5 figures

Journal-ref: Phys. Rev. Lett. 100, 083002 (2008)

DOI: 10.1103/PhysRevLett.100.083002

\\ ( http://arxiv.org/abs/0710.4052 , 313kb)

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\\

arXiv:0710.5187

replaced with revised version Fri, 29 Feb 2008 17:40:44 GMT (534kb,D)

Title: Phase Coherence and Superfluid-Insulator Transition in a Disordered

Bose-Einstein Condensate

Authors: Yong P. Chen, J. Hitchcock, D. Dries, M. Junker, C. Welford, R. G.

Hulet

Categories: cond-mat.other

Comments: 4 pages, 5 figures, distortions in figures 1 and 4 have been fixed in

version 3. This paper has been accepted to PRA

\\ ( http://arxiv.org/abs/0710.5187 , 534kb)

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\\

arXiv:cond-mat/0609604

replaced with revised version Mon, 3 Mar 2008 06:04:56 GMT (24kb)

Title: Mixture of bosonic and spin-polarized fermionic atoms in an optical

lattice

Authors: Lode Pollet, Corinna Kollath, Ulrich Schollwoeck, Matthias Troyer

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

Comments: 4 pages, 5 figures

Journal-ref: Phys. Rev. A 77, 023608 (2008)

DOI: 10.1103/PhysRevA.77.023608

\\ ( http://arxiv.org/abs/cond-mat/0609604 , 24kb)

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\\

arXiv:0710.1575

replaced with revised version Mon, 3 Mar 2008 09:25:53 GMT (847kb)

Title: Probing quantum and thermal noise in an interacting many-body system

Authors: S. Hofferberth, I. Lesanovsky, T. Schumm, A. Imambekov, V. Gritsev, E.

Demler, J. Schmiedmayer

Categories: cond-mat.other

\\ ( http://arxiv.org/abs/0710.1575 , 847kb)

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arXiv:0712.3851

replaced with revised version Fri, 29 Feb 2008 12:17:13 GMT (30kb)

Title: Nonlinear behavior of bosons in anisotropic optical lattices

Authors: A. Cetoli, E. Lundh

Categories: cond-mat.other

Comments: 5 pages, 4 figures, discussion revised after referee comments

\\ ( http://arxiv.org/abs/0712.3851 , 30kb)

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\\

arXiv:0802.3163

replaced with revised version Mon, 3 Mar 2008 17:04:48 GMT (657kb,D)

Title: Creation, manipulation, and detection of anyons in optical lattices

Authors: M. Aguado, G. K. Brennen, F. Verstraete, J. I. Cirac

Categories: quant-ph cond-mat.other

Comments: 8 pages, 4 pdf figures; v2: reference added, typos fixed

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

\\ ( http://arxiv.org/abs/0802.3163 , 657kb)

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\\

arXiv:cond-mat/0703585

replaced with revised version Tue, 4 Mar 2008 07:21:29 GMT (15kb)

Title: Finite Temperature Scaling Theory for the Collapse of BEC

Authors: Shyamal Biswas

Categories: cond-mat.stat-mech

Comments: 3 pages, 2 figures

\\ ( http://arxiv.org/abs/cond-mat/0703585 , 15kb)

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\\

arXiv:0707.4119

replaced with revised version Tue, 4 Mar 2008 18:09:57 GMT (9kb)

Title: Supersymmetry and Goldstino Mode in Bose-Fermi Mixtures

Authors: Yue Yu and Kun Yang

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

Comments: 4 pages. V2: published version

Journal-ref: Phys. Rev. Lett. 100, 090404 (2008)

DOI: 10.1103/PhysRevLett.100.090404

\\ ( http://arxiv.org/abs/0707.4119 , 9kb)

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\\

arXiv:0709.3158

replaced with revised version Tue, 4 Mar 2008 11:17:37 GMT (110kb)

Title: Twin peaks in rf spectra of Fermi gases at unitarity

Authors: P. Massignan, G. M. Bruun and H. T. C. Stoof

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

Comments: v3: version accepted for publication as a Rapid Communication in PRA.

With respect to v2, minor changes in the text and in the inset of Fig. 2

Journal-ref: Phys. Rev. A 77, 031601(R) (2008)

DOI: 10.1103/PhysRevA.77.031601

\\ ( http://arxiv.org/abs/0709.3158 , 110kb)

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\\

arXiv:0707.4520

replaced with revised version Tue, 4 Mar 2008 02:59:38 GMT (21kb)

Title: Correlation Functions of One-Dimensional Lieb-Liniger Anyons

Authors: Ovidiu I. Patu, Vladimir E. Korepin, Dmitri V. Averin

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

Comments: 19 pages, RevTeX 4

Journal-ref: J. Phys. A: Math. Theor. 40 (2007) 14963-14984

\\ ( http://arxiv.org/abs/0707.4520 , 21kb)

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\\

arXiv:0707.2963

replaced with revised version Wed, 5 Mar 2008 20:54:09 GMT (496kb)

Title: Two-body transients in coupled atomic-molecular BECs

Authors: Pascal Naidon, Eite Tiesinga and Paul S. Julienne

Categories: physics.atom-ph

Comments: 4 pages, 3 figures - typos corrected in formulae

\\ ( http://arxiv.org/abs/0707.2963 , 496kb)

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\\

arXiv:cond-mat/0505200

replaced with revised version Thu, 6 Mar 2008 04:11:45 GMT (28kb)

Title: Energetics of a strongly correlated Fermi gas

Authors: Shina Tan

Categories: cond-mat.stat-mech

Comments: 28 pages, 1 figure

\\ ( http://arxiv.org/abs/cond-mat/0505200 , 28kb)

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\\

arXiv:0712.1518

replaced with revised version Thu, 6 Mar 2008 07:24:18 GMT (201kb)

Title: Phase diagram of anisotropic boson t-J model

Authors: M. Boninsegni and N. V. Prokof'ev

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

Comments: Replaced with published version

Journal-ref: Phys. Rev. B 77, 092502 (2008)

DOI: 10.1103/PhysRevB.77.092502

\\ ( http://arxiv.org/abs/0712.1518 , 201kb)

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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 Wed Apr 02 2008 - 09:39:35 EST

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