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

Date: Fri, 16 Dec 2005 17:25:17 +1000 (EST)

Date: Fri, 16 Dec 2005 17:25:17 +1000 (EST)

The second week of my selection.

I am going to start sending this to a list of email addresses so that I

dont spam people who dont want it. If you would like to be on the list,

please let me know. I plan to send an email every week (probably Friday or

Monday).

Also, feel free to let others know that I am trying to get this started: a

weekly selection biased towards cold atoms and quantum stuff from

cond-mat, quant-ph, and physics archives.

Enjoy! 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/ ------------------------------------------------------------------------- ------------------------------------------------------------------------------ \\ Paper: cond-mat/0507125 replaced with revised version Fri, 9 Dec 2005 19:12:51 GMT (30kb) Title: Berry Phase Effect on Semiclassical Dynamics of Bogoliubov Quasiparticles Authors: Chuanwei Zhang, Artem M. Dudarev, and Qian Niu Comments: 5 pages, 1 figure Subj-class: Statistical Mechanics \\ ( http://arXiv.org/abs/cond-mat/0507125 , 30kb) ------------------------------------------------------------------------------ -- \\ Paper: cond-mat/0512216 Date: Sat, 10 Dec 2005 06:55:56 GMT (586kb) Title: Breaking of Chiral Symmetry and Spontaneous Rotation in a Spinor Bose-Einstein Condensate Authors: Hiroki Saito, Yuki Kawaguchi, and Masahito Ueda Comments: 5 pages, 4 figures Subj-class: Other \\ We show that a spin-1 Bose-Einstein condensate with ferromagnetic interactions spontaneously generates a topological spin texture, in which the m = \pm 1 components of the magnetic sublevels form vortices with opposite circulations. This phenomenon originates from an interplay between ferromagnetic interactions and spin conservation. \\ ( http://arXiv.org/abs/cond-mat/0512216 , 586kb) ---------------------------------------------------------------------------- -- \\ Paper: cond-mat/0512218 Date: Sat, 10 Dec 2005 10:55:53 GMT (437kb) Title: Adiabatic N-soliton interactions of Bose-Einstein condensates in external potentials Authors: V. S. Gerdjikov (Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, Bulgaria), B. B. Baizakov, M. Salerno (Dipartimento di Fisica, Universit\'a di Salerno, Italy), N. A. Kostov (Institute for Electronics, Bulgarian Academy of Sciences, Bulgaria) Comments: 13 pages, 8 figures, RevTeX Subj-class: Other \\ Perturbed version of the complex Toda chain (CTC) has been employed to describe adiabatic interactions within N-soliton train of the nonlinear Schrodinger equation (NLS). Perturbations induced by weak quadratic and periodic external potentials are studied by both analytical and numerical means. It is found that the perturbed CTC adequately models the N-soliton train dynamics for both types of potentials. As an application of the developed theory we consider the dynamics of a train of matter - wave solitons confined to a parabolic trap and optical lattice, as well as tilted periodic potentials. In the last case we demonstrate that there exist critical values of the strength of the linear potential for which one or more localized states can be extracted from a soliton train. An analytical expression for these critical strengths for expulsion is also derived. \\ ( http://arXiv.org/abs/cond-mat/0512218 , 437kb) ---------------------------------------------------------------------------- \\ Paper: cond-mat/0512232 Date: Sun, 11 Dec 2005 17:54:43 GMT (297kb) Title: Alternate solitons: Nonlinearly-managed one- and two-dimensional solitons in optical lattices Authors: Arthur Gubeskys, Boris A. Malomed, and Ilya M. Merhasin Comments: 10 pages + 16 figures Subj-class: Other Journal-ref: Studies in Applied Mathematics, Volume 115, Issue 2, Page 255-277, Aug 2005 \\ We consider a model of Bose-Einstein condensates which combines a stationary optical lattice (OL) and periodic change of the sign of the scattering length (SL) due to the Feshbach-resonance management. Ordinary solitons and ones of the gap type being possible, respectively, in the model with constant negative and positive SL, an issue of interest is to find solitons alternating, in the case of the low-frequency modulation, between shapes of both types, across the zero-SL point. We find such \textit{alternate solitons} and identify their stability regions in the 2D and 1D models. Three types of the dynamical regimes are distinguished: stable, unstable, and semi-stable. In the latter case, the soliton sheds off a conspicuous part of its initial norm before relaxing to a stable regime. In the 2D case, the threshold (minimum number of atoms) necessary for the existence of the alternate solitons is essentially higher than its counterparts for the ordinary and gap solitons in the static model. In the 1D model, the alternate solitons are also found only above a certain threshold, while the static 1D models have no threshold. In the 1D case, stable antisymmetric alternate solitons are found too. Additionally, we consider a possibility to apply the variational approximation (VA) to the description of stationary gap solitons, in the case of constant positive SL. It predicts the solitons in the first finite bandgap very accurately, and does it reasonably well in the second gap too. In higher bands, the VA predicts a border between tightly and loosely bound solitons. \\ ( http://arXiv.org/abs/cond-mat/0512232 , 297kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0512241 Date: Mon, 12 Dec 2005 19:00:03 GMT (75kb) Title: Quantum degenerate Bose-Fermi mixtures on 1-D optical lattices Authors: Pinaki Sengupta, and Leonid P. Pryadko Comments: 4 pages, 4 figures Subj-class: Strongly Correlated Electrons \\ We combine model mapping, exact spectral bounds, and a quantum Monte Carlo method to study the ground state phases of a mixture of ultracold bosons and spin-polarized fermions in a one-dimensional optical lattice. The exact boundary of the boson-demixing transition is obtained from the Bethe Ansatz solution of the standard Hubbard model. We prove that along a symmetry plane in the parameter space, the boson-fermion mixed phase is stable at all densities. This phase is a two-component Luttinger liquid for weak couplings or for incommensurate total density, otherwise it has a charge gap but retains a gapless mode of mixture composition fluctuations. The static density correlations are studied in these two limits and shown to have markedly different features. \\ ( http://arXiv.org/abs/cond-mat/0512241 , 75kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0512243 Date: Mon, 12 Dec 2005 09:15:14 GMT (216kb) Title: Phase diagram of Bose-Fermi mixtures in one-dimensional optical lattices Authors: Lode Pollet, Matthias Troyer, Kris Van Houcke, Stefan M. A. Rombouts Comments: 5 pages, 5 figures Subj-class: Statistical Mechanics \\ The ground state phase diagram of the one-dimensional Bose-Fermi Hubbard model is studied in the canonical ensemble using a quantum Monte Carlo method. We focus on the case where both species have half filling in order to maximize the pairing correlations between the bosons and the fermions. In case of equal hopping we distinguish between phase separation, a Luttinger liquid phase and a phase characterized by strong singlet pairing between the species. True long-range density waves exist with unequal hopping amplitudes. \\ ( http://arXiv.org/abs/cond-mat/0512243 , 216kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0506098 replaced with revised version Sun, 11 Dec 2005 17:43:08 GMT (40kb) Title: Phase diagram of spin-1 bosons on one-dimensional lattices Authors: Matteo Rizzi, Davide Rossini, Gabriele De Chiara, Simone Montangero, and Rosario Fazio Comments: 5 pages, 4 figures, published version Subj-class: Other Journal-ref: Phys Rev. Lett. 95, 240404 (2005) DOI: 10.1103/PhysRevLett.95.240404 \\ ( http://arXiv.org/abs/cond-mat/0506098 , 40kb) ------------------------------------------------------------------------------ \\ Paper: quant-ph/0507091 replaced with revised version Mon, 12 Dec 2005 19:56:16 GMT (419kb) Title: Entangled light pulses from single cold atoms Authors: Giovanna Morigi, Juergen Eschner, Stefano Mancini, and David Vitali Comments: 4 pages, 3 figures, revised version (new scheme for generation of subsequent pairs of entangled pulses included). Accepted for publication in Phys. Rev. Lett \\ ( http://arXiv.org/abs/quant-ph/0507091 , 419kb) ------------------------------------------------------------------------------ \\ Paper: physics/0510101 replaced with revised version Mon, 12 Dec 2005 10:20:23 GMT (193kb) Title: A new determination of the fine structure constant based on Bloch oscillations of ultracold atoms in a vertical optical lattic Authors: Pierre Clad\'{e} (LKB - Jussieu), Estefania De Mirandes (LKB - Jussieu), Malo Cadoret (LKB - Jussieu), Sa\"{i}da Guellati-Kh\'{e}lifa (BNM-INM), Catherine Schwob (LKB - Jussieu), Fran\c{c}ois Nez (LKB - Jussieu), Lucile Julien (LKB - Jussieu), Fran\c{c}ois Biraben (LKB - Jussieu) Proxy: ccsd ccsd-00011150 Subj-class: Atomic Physics \\ ( http://arXiv.org/abs/physics/0510101 , 193kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0512243 replaced with revised version Tue, 13 Dec 2005 08:41:11 GMT (216kb) Title: Phase diagram of Bose-Fermi mixtures in one-dimensional optical lattices Authors: Lode Pollet, Matthias Troyer, Kris Van Houcke, Stefan M. A. Rombouts Comments: 5 pages, 5 figures, updated references Subj-class: Statistical Mechanics \\ ( http://arXiv.org/abs/cond-mat/0512243 , 216kb) ------------------------------------------------------------------------------ \\ Paper: physics/0512107 Date: Mon, 12 Dec 2005 22:01:20 GMT (35kb) Title: Dynamic Manipulation of Bose-Einstein Condensates With a Spatial Light Modulator Authors: V. Boyer, R. M. Godun, G. Smirne, D. Cassettari, C. M. Chandrashekar, A. B. Deb, Z. J. Laczik, and C. J. Foot Comments: 4 pages, 4 figures Subj-class: Atomic Physics; Optics \\ We manipulate a Bose-Einstein condensate using the optical trap created by the diffraction of a laser beam on a fast ferro-electric liquid crystal spatial light modulator. The modulator acts as a phase grating which can generate arbitrary diffraction patterns and be rapidly reconfigured at rates up to 1 kHz to create smooth, time-varying optical potentials. The flexibility of the device is demonstrated with our experimental results for splitting a Bose-Einstein condensate and independently transporting the separate parts of the atomic cloud. \\ ( http://arXiv.org/abs/physics/0512107 , 35kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0512294 Date: Wed, 14 Dec 2005 07:55:20 GMT (22kb) Title: Goldstone Theorem, Hugenholtz-Pines Theorem and Ward-Takahashi Relation in Finite Volume Bose-Einstein Condensed Gases Authors: Hiroaki Enomoto, Masahiko Okumura and Yoshiya Yamanaka Comments: 35pages Subj-class: Strongly Correlated Electrons \\ We construct an approximate scheme based on the concept of the spontaneous symmetry breakdown, satisfying the Goldstone theorem, for finite volume Bose-Einstein condensed gases in both zero and finite temperature case. In this paper, we discuss the Bose-Einstein condensation in a box with periodic boundary condition and do not assume the thermodynamic limit. When energy spectrum is discrete, we found that it is necessary to deal with the Nambu-Goldstone mode explicitly without the Bogoliubov's prescription, in which zero-mode creation- and annihilation-operators are replaced with a {\it c}-number by hand, for satisfying the Goldstone theorem. Furthermore, we confirm that the unitary inequivalence of vacua in the spontaneous symmetry breakdown is true for the finite volume system. \\ ( http://arXiv.org/abs/cond-mat/0512294 , 22kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0506118 replaced with revised version Wed, 14 Dec 2005 06:57:03 GMT (132kb) Title: Vortex Lattice in the Planar Bose-Einstein Condensates with Dipolar Interactions Authors: Jian Zhang and Hui Zhai Comments: 4 pages, 3 figures, published version Subj-class: Other Journal-ref: Physical Review Letters, 95, 200403 (2005) \\ ( http://arXiv.org/abs/cond-mat/0506118 , 132kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0506331 replaced with revised version Wed, 14 Dec 2005 20:03:13 GMT (24kb) Title: Breathing mode of rapidly rotating Bose-Einstein condensates Authors: Gentaro Watanabe Comments: 10 pages, 3 figures. Extended discussion. see also cond-mat/0512317. Accepted for publication in Phys. Rev. A Report-no: NORDITA-2005-40 Subj-class: Other \\ ( http://arXiv.org/abs/cond-mat/0506331 , 24kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0511501 replaced with revised version Wed, 14 Dec 2005 18:59:45 GMT (558kb) Title: Phase Transitions in Small Systems: Microcanonical vs. Canonical Ensembles Authors: J\"orn Dunkel and Stefan Hilbert Comments: tex-style changed, minor additions in the text, references added Subj-class: Statistical Mechanics \\ ( http://arXiv.org/abs/cond-mat/0511501 , 558kb) ------------------------------------------------------------------------------ \\ Paper (*cross-listing*): quant-ph/0511035 replaced with revised version Wed, 14 Dec 2005 14:40:26 GMT (14kb) Title: Dephasing in matter-wave interferometry Authors: Fernando C. Lombardo and Paula I. Villar Comments: 9 pages, 1 eps-figure. To appear in J. Phys. A: Math. Gen Subj-class: Quantum Physics; Other \\ ( http://arXiv.org/abs/quant-ph/0511035 , 14kb) ------------------------------------------------------------------------------ \\ Paper: quant-ph/0512105 Date: Tue, 13 Dec 2005 22:03:00 GMT (6kb) Title: Deriving Landauer's erasure principle from statistical mechanics Authors: Kurt Jacobs Comments: 3 pages, revtex4. Comments appreciated \\ We present a concise derivation of Landauer's erasure principle from the postulates of statistical mechanics, along with a small number of additional but uncontroversial axioms. \\ ( http://arXiv.org/abs/quant-ph/0512105 , 6kb) ------------------------------------------------------------------------------ \\ Paper: physics/0512126 Date: Wed, 14 Dec 2005 16:06:25 GMT (419kb) Title: Sagnac Interferometry in a Slow-Light Medium Authors: Graham T. Purves, Charles S. Adams and Ifan G. Hughes Comments: 4 pages and 4 figures Subj-class: Atomic Physics; Optics \\ We use a Sagnac interferometer to measure the dispersive and absorptive properties of room temperature Rubidium vapor on the D_2 line at 780.2 nm. We apply a pump beam such that the resulting Lambda system exhibits Electromagnetically Induced Transparency. Using a "biased alignment" technique we demonstrate a direct and robust method of measuring the rapid variation in the refractive index. Such a "slow-light" Sagnac interferometer is ideally suited to precision measurement applications such as magnetometry and inertial sensing. \\ ( http://arXiv.org/abs/physics/0512126 , 419kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0512344 Date: Thu, 15 Dec 2005 14:56:41 GMT (117kb) Title: Vortex state in Bose-Fermi mixture with attraction between bosons and fermions Authors: N.M. Chtchelkatchev, S.-T. Chui, V. N. Ryzhov Comments: 7 pages, 8 figures Subj-class: Statistical Mechanics \\ Vortex states in the mixture of ultracold atomic clouds of bosons and fermions are investigated using the effective Hamiltonian for the Bose subsystem. A stability of the Bose system in the case of attractive interaction between components is studied in the framework of variational Bose wave function and Thomas-Fermi approximation. It is shown that the critical number of bosons increases in the presence of the vortex. \\ ( http://arXiv.org/abs/cond-mat/0512344 , 117kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0512354 Date: Thu, 15 Dec 2005 17:05:20 GMT (29kb) Title: Trapped fermions with density imbalance in the BEC limit Authors: P. Pieri and G.C. Strinati Comments: 5 pages, 4 figures Subj-class: Superconductivity; Other \\ We analyze the effects of imbalancing the populations of two-component trapped fermions, in the BEC limit of the attractive interaction between different fermions. Starting from the gap equation with two fermionic chemical potentials, we derive a set of coupled equations that describe composite bosons and excess fermions. We include in these equations the processes leading to the correct dimer-dimer and dimer-fermion scattering lengths. The coupled equations are then solved in the Thomas-Fermi approximation to obtain the density profiles for composite bosons and excess fermions, which are relevant to the recent experiments with trapped fermionic atoms \\ ( http://arXiv.org/abs/cond-mat/0512354 , 29kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0512356 Date: Thu, 15 Dec 2005 17:36:36 GMT (21kb) Title: The XY Model and the Berezinskii-Kosterlitz-Thouless Phase Transition Authors: Ralph Kenna Comments: 5 pages, 1 figure. Short review prepared for the Annals of the Marie Curie Fellowships Subj-class: Statistical Mechanics \\ In statistical physics, the XY model in two dimensions provides the paradigmatic example of phase transitions mediated by topological defects (vortices). Over the years, a variety of analytical and numerical methods have been deployed in an attempt to fully understand the nature of its transition, which is of the Berezinskii-Kosterlitz-Thouless type. These met with only limited success until it was realized that subtle effects (logarithmic corrections) that modify leading behaviour must be taken into account. This realization prompted renewed activity in the field and significant progress has been made. This paper contains a review of the importance of such subtleties, the role played by vortices and of recent and current research in this area. Directions for desirable future research endeavours are outlined. \\ ( http://arXiv.org/abs/cond-mat/0512356 , 21kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0512359 Date: Thu, 15 Dec 2005 19:17:25 GMT (6kb) Title: Images of a Bose-Einstein condensate in position and momentum space Authors: Jacek Dziarmaga and Krzysztof Sacha Comments: 4 pages; Talk given at the Laser Physics Workshop, July 2005, Kyoto, Japan Subj-class: Other \\ In the Bogoliubov theory a condensate initially prepared in its ground state described by stationary Bogoliubov vacuum and later perturbed by a time-dependent potential or interaction strength evolves into a time-dependent excited state which is dynamical Bogoliubov vacuum. The dynamical vacuum has a simple diagonal form in a time-dependent orthonormal basis of single particle modes. This diagonal representation leads to a gaussian probability distribution for possible outcomes of density measurements in position and momentum space. In these notes we also discuss relations with the U(1) symmetry breaking version of the Bogoliubov theory and give two equivalent gaussian integral representations of the dynamical vacuum state. \\ ( http://arXiv.org/abs/cond-mat/0512359 , 6kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0509373 replaced with revised version Thu, 15 Dec 2005 09:17:01 GMT (35kb) Title: Dynamics of a trapped Fermi gas in the BCS phase Authors: M. Urban and P. Schuck Comments: 15 pages, 4 figures; v2: discussion and references added Subj-class: Other; Nuclear Theory \\ ( http://arXiv.org/abs/cond-mat/0509373 , 35kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0510634 replaced with revised version Thu, 15 Dec 2005 15:43:01 GMT (61kb) Title: Spin-3 Chromium Bose-Einstein Condensates Authors: L. Santos and T. Pfau Comments: 4 pages, 3 eps figures. Error in the previous version corrected Subj-class: Other \\ ( http://arXiv.org/abs/cond-mat/0510634 , 61kb) ------------------------------------------------------------------------------ \\ Paper: quant-ph/0512119 Date: Thu, 15 Dec 2005 15:36:41 GMT (17kb) Title: On the Generators of Quantum Stochastic Master Equation Authors: V. P. Belavkin Comments: 14 pages. See also relevant papers at http://www.maths.nott.ac.uk/personal/vpb/research/evo_equ.html and http://www.maths.nott.ac.uk/personal/vpb/research/fil_con.html Journal-ref: Theoretical and Mathematical Physics, 110 (1997) No 1, 46--60 \\ A characterisation of the stochastic bounded generators of quantum irreversible Master equations is given. This suggests the general form of quantum stochastic evolution with respect to the Poisson (jumps), Wiener (diffusion) or general Quantum Noise. The corresponding irreversible Heisenberg evolution in terms of stochastic completely positive (CP) maps is found and the general form of the stochastic completely dissipative (CD) operator equation is discovered. \\ ( http://arXiv.org/abs/quant-ph/0512119 , 17kb) ------------------------------------------------------------------------------ \\ Paper: quant-ph/0512121 Date: Thu, 15 Dec 2005 16:23:28 GMT (256kb) Title: Normal mode splitting and mechanical effects of an optical lattice in a ring cavity Authors: Julian Klinner, Malik Lindholdt, Boris Nagorny, and Andreas Hemmerich Comments: 4 pages, 3 figures \\ A novel regime of atom-cavity physics is explored, arising when large atom samples dispersively interact with high-finesse optical cavities. A stable far detuned optical lattice of several million rubidium atoms is formed inside an optical ring resonator by coupling equal amounts of laser light to each propagation direction of a longitudinal cavity mode. An adjacent longitudinal mode, detunedby about 3 GHz, is used to perform probe transmission spectroscopy of the system. The atom-cavity coupling for the lattice beams and the probe is dispersive and dissipation results only from the finite photon-storage time. The observation of two well-resolved normal modes demonstrates the regime of strong cooperative coupling. The details of the normal mode spectrum reveal mechanical effects associated with the retroaction of the probe upon the optical lattice. \\ ( http://arXiv.org/abs/quant-ph/0512121 , 256kb) ------------------------------------------------------------------------------ \\ Paper: physics/0512141 Date: Thu, 15 Dec 2005 16:59:46 GMT (548kb) Title: Single-impulse magnetic focusing of launched cold atoms Authors: Matthew J Pritchard, Aidan S Arnold, David A Smith and Ifan G Hughes Comments: 16 pages, 7 figures Subj-class: Atomic Physics; Optics Journal-ref: J. Phys. B, 37 4435 (2004) \\ We have theoretically investigated the focusing of a launched cloud of cold atoms. Time-dependent spatially-varying magnetic fields are used to impart impulses leading to a three-dimensional focus of the launched cloud. We discuss possible coil arrangements for a new focusing regime: isotropic 3D focusing of atoms with a single-impulse magnetic lens. We investigate focusing aberrations and find that, for typical experimental parameters, the widely used assumption of a purely harmonic lens is often inaccurate. The baseball lens offers the best possibility for isotropically focusing a cloud of weak-field-seeking atoms in 3D. \\ ( http://arXiv.org/abs/physics/0512141 , 548kb) ------------------------------------------------------------------------------ \\ Paper: physics/0408088 replaced with revised version Thu, 15 Dec 2005 14:26:16 GMT (45kb) Title: Classical diffusion in double-delta-kicked particles Authors: M. Stocklin and T.S. Monteiro Comments: 8 pages, 2 figures, typo corrected Subj-class: Atomic Physics \\ ( http://arXiv.org/abs/physics/0408088 , 45kb) ------------------------------------------------------------------------------ \\ Paper: physics/0411113 replaced with revised version Thu, 15 Dec 2005 13:56:54 GMT (71kb) Title: Manipulation of ultracold atomic mixtures using microwave techniques Authors: D. Ciampini, E. Courtade, C. Sias, D. Cossart, G. Carelli, F. Mango, O. Morsch and E. Arimondo Comments: 9 pages, 6 figures Subj-class: Atomic Physics \\ ( http://arXiv.org/abs/physics/0411113 , 71kb) ------------------------------------------------------------------------------Received on Fri Dec 16 2005 - 17:25:17 EST

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