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

Date: Fri, 9 Dec 2005 17:19:33 +1000 (EST)

Date: Fri, 9 Dec 2005 17:19:33 +1000 (EST)

Hi everyone,

I'm going to try and start a new service: a filtering of recent papers

from arxiv.org, mainly in the area of ultracold quantum gases (but also

anything else that takes my fancy) from the recent submissions to the

cond-mat, quant-ph, and physics arxivs. Hopefully I will send it on a

weekly basis. I will probably start a mailing list for this: in the

meantime BECjournal will do.

Enjoy,

Matt.

-- ------------------------------------------------------------------------- Dr M. J. Davis, 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/0512007 Date: Thu, 1 Dec 2005 17:06:34 GMT (114kb) Title: Instability of a superfluid Bose gas induced by a locked thermal gas in an optical lattice Authors: Satoru Konabe and Tetsuro Nikuni Comments: 10 pages, 1 figure Subj-class: Other \\ We use a dissipative Gross-Petaevskii equation derived from the Bose-Hubbard Hamiltonian to study the effect of the thermal component on the stability of a current-carrying superfluid state of a Bose gas in an optical lattice potential. We explicitly show that the superfluid state becomes unstable at certain quasi-momentum of the condensate due to a thermal component which is locked by an optical lattice potential. It is shown that this instability coincides with the Landau instability derived from the GP equation. \\ ( http://arXiv.org/abs/cond-mat/0512007 , 114kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0512010 Date: Thu, 1 Dec 2005 19:11:02 GMT (421kb) Title: Sound velocity and dimensional crossover in a superfluid Fermi gas in an optical lattice Authors: T. Koponen, J.-P. Martikainen, J. Kinnunen, and P. Torma Comments: 16 pages, 9 figures Subj-class: Superconductivity \\ We study the density response and the sound velocity in isotropic and anisotropic three-dimensional optical lattices. We show how the van Hove singularity of the free Fermi gas is smoothened by interactions and eventually vanishes when interactions are strong enough. For anisotropic lattices, we show that the speed of sound shows clear signatures of dimensional crossover both in the 1D and 2D limits. \\ ( http://arXiv.org/abs/cond-mat/0512010 , 421kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0512018 Date: Thu, 1 Dec 2005 14:19:51 GMT (587kb) Title: Fourier Synthesis of Conservative Atom Potentials Authors: Gunnar Ritt, Carsten Geckeler, Tobias Salger, Giovanni Cennini, Martin Weitz Comments: 4 pages, 4 figures Subj-class: Other \\ We demonstrate a scheme for the Fourier synthesis of conservative optical potentials for atoms. An atomic Bose-Einstein condensate is exposed to either symmetric or sawtooth-like asymmetric potentials by superimposing a conventional standing wave potential of $\lambda / 2$ spatial periodicity with a fourth-order lattice potential of $\lambda / 4$ periodicity. The high periodicity lattice is realized with a Doppler-sensitive multiphoton Raman process. A suitable combination of laser frequencies suppresses unwanted standing wave effects. Future applications of the demonstrated scheme could include dissipationless atomic quantum ratchets. \\ ( http://arXiv.org/abs/cond-mat/0512018 , 587kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0512023 Date: Thu, 1 Dec 2005 15:59:23 GMT (217kb) Title: Bose-Einstein condensation vs. localization of bosonic quasiparticles in disordered weakly-coupled dimer antiferromagnets Authors: Tommaso Roscilde, Stephan Haas Comments: 12 pages, 4 figures. Contribution to the BEC Cortona Workshop 2005 Subj-class: Strongly Correlated Electrons; Disordered Systems and Neural Networks \\ We investigate the field-induced insulator-to-superfluid transition of bosonic quasiparticles in $S=1/2$ weakly-coupled dimer antiferromagnets. In presence of realistic disorder due to site dilution of the magnetic lattice, we show that the system displays an extended Bose-glass phase characterized by the localization of the hard-core quasiparticles. \\ ( http://arXiv.org/abs/cond-mat/0512023 , 217kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0512031 Date: Thu, 1 Dec 2005 20:07:04 GMT (70kb) Title: Interaction-Induced Localization of an Impurity in a Trapped Bose Condensate Authors: Ryan M. Kalas and D. Blume Comments: 6 pages, 4 figures Subj-class: Other \\ We study the ground state properties of a trapped Bose condensate with a neutral impurity. By varying the strength of the attractive atom-impurity interactions the degree of localization of the impurity at the trap center can be controlled. As the impurity becomes more strongly localized the peak condensate density, which can be monitored experimentally, grows markedly. For strong enough attraction, the impurity can make the condensate unstable by strongly deforming the atom density in the neighborhood of the impurity. This "collapse" can possibly be investigated in bosenova-type experiments. \\ ( http://arXiv.org/abs/cond-mat/0512031 , 70kb) ------------------------------------------------------------------------------ \\ Paper (*cross-listing*): physics/0511239 Date: Mon, 28 Nov 2005 21:27:09 GMT (287kb) Date (revised v2): Wed, 30 Nov 2005 15:39:08 GMT (287kb) Title: Coupled dynamics of atoms and radiation pressure driven interferometers Authors: D. Meiser and P. Meystre Comments: 11 pages Subj-class: Atomic Physics; Optics; Other \\ We consider the motion of the end mirror of a cavity in whose standing wave mode pattern atoms are trapped. The atoms and the light field strongly couple to each other because the atoms form a distributed Bragg mirror with a reflectivity that can be fairly high. We analyze how the dipole potential in which the atoms move is modified due to this backaction of the atoms. We show that the position of the atoms can become bistable. These results are of a more general nature and can be applied to any situation where atoms are trapped in an optical lattice inside a cavity and where the backaction of the atoms on the light field cannot be neglected. We analyze the dynamics of the coupled system in the adiabatic limit where the light field adjusts to the position of the atoms and the light field instantaneously and where the atoms move much faster than the mirror. We calculate the side band spectrum of the light transmitted through the cavity and show that these spectra can be used to detect the coupled motion of the atoms and the mirror. \\ ( http://arXiv.org/abs/physics/0511239 , 287kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0509776 replaced with revised version Thu, 1 Dec 2005 18:34:17 GMT (151kb) Title: The Population Oscillation of Multicomponent Spinor Bose-Einstein Condensate Induced by Nonadiabatic Transitions Authors: Xiuquan Ma, Lin Xia, Fang Yang, Xiaoji Zhou, Yiqiu Wang, Hong Guo, and Xuzong Chen Comments: 6 pages, 5 figures Subj-class: Other \\ ( http://arXiv.org/abs/cond-mat/0509776 , 151kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0508195 replaced with revised version Thu, 1 Dec 2005 18:23:47 GMT (59kb) Title: Velocity of vortices in inhomogeneous Bose-Einstein condensates Authors: Halvor M. Nilsen, Gordon Baym, and C. J. Pethick Comments: 4 pages, one .eps figure Change of title. Improved presentation of physics Report-no: NORDITA-2005-51 Subj-class: Other \\ ( http://arXiv.org/abs/cond-mat/0508195 , 59kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0512048 Date: Fri, 2 Dec 2005 12:32:52 GMT (77kb) Title: Molecular signatures in the structure factor of an interacting Fermi gas Authors: R. Combescot, S. Giorgini, S. Stringari Comments: 4 pages, 4 figures Subj-class: Other \\ The static and dynamic structure factors of an interacting Fermi gas along the BCS-BEC crossover are calculated at momentum transfer $\hbar{\bf k}$ higher than the Fermi momentum. The spin structure factor is found to be very sensitive to the correlations associated with the formation of molecules. On the BEC side of the crossover, even close to unitarity, clear evidence is found for a molecular excitation at $\hbar^2 k^2 /4m$, where $m$ is the atomic mass. Both quantum Monte Carlo and dynamic mean-field results are presented. \\ ( http://arXiv.org/abs/cond-mat/0512048 , 77kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0511641 replaced with revised version Fri, 2 Dec 2005 19:49:45 GMT (40kb) Title: Quantum criticality of a Fermi gas with a spherical dispersion minimum Authors: Kun Yang and Subir Sachdev Comments: 4 pages, 1 figure; (v2) added clarifications in response to comments Subj-class: Strongly Correlated Electrons; Superconductivity \\ ( http://arXiv.org/abs/cond-mat/0511641 , 40kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0512082 Date: Mon, 5 Dec 2005 11:11:29 GMT (392kb) Title: Elastic scattering losses from colliding BEC's Authors: Pawel Zin, Jan Chwedenczuk and Marek Trippenbach Comments: 10 pages, 9 figures Subj-class: Other \\ Bragg diffraction divides a Bose-Einstein condensate into two overlapping components, moving with respect to each other with high momentum. Elastic collisions between atoms from distinct wave packets can significantly deplete the condensate. Recently Zi\'{n} {\it et al.} (Phys. Rev. Lett. {\bf 94}, 200401 (2005)) have introduced a model of two counter-propagating atomic Gaussian wavepackets incorporating dynamics of the incoherent scattering processes. Here we study the properties of this model in detail, including the nature of the transition from spontaneous to stimulated scattering. Within the first order approximation we derive analytical expressions for the density matrix and anomalous density which provides excellent insight into correlation properties of scattered atoms. \\ ( http://arXiv.org/abs/cond-mat/0512082 , 392kb) ------------------------------------------------------------------------------ \\ Paper: quant-ph/0512006 Date: Thu, 1 Dec 2005 11:29:25 GMT (366kb) Title: Time-resolved and state-selective detection of single freely falling atoms Authors: Torsten Bondo, Markus Hennrich, Thomas Legero, Gerhard Rempe, and Axel Kuhn Comments: 6 pages, 7 figures \\ We report on the detection of single, slowly moving Rubidium atoms using laser-induced fluorescence. The atoms move at 3 m/s while they are detected with a time resolution of 60 microseconds. The detection scheme employs a near-resonant laser beam that drives a cycling atomic transition, and a highly efficient mirror setup to focus a large fraction of the fluorescence photons to a photomultiplier tube. It counts on average 20 photons per atom. \\ ( http://arXiv.org/abs/quant-ph/0512006 , 366kb) ------------------------------------------------------------------------------ \\ Paper (*cross-listing*): nlin.CD/0512002 Date: Thu, 1 Dec 2005 14:14:49 GMT (504kb) Title: Can quantum fractal fluctuations be observed in an atom-optics kicked rotor experiment? Authors: Andrea Tomadin, Riccardo Mannella, and Sandro Wimberger Comments: 18 pp, 7 figs., 1 table Subj-class: Chaotic Dynamics \\ We investigate the parametric fluctuations in the quantum survival probability of an open version of the delta-kicked rotor model in the deep quantum regime. Spectral arguments [Guarneri I and Terraneo M 2001 Phys. Rev. E vol. 65 015203(R)] predict the existence of parametric fractal fluctuations owing to the strong dynamical localisation of the eigenstates of the kicked rotor. We discuss the possibility of observing such dynamically-induced fractality in the quantum survival probability as a function of the kicking period for the atom-optics realisation of the kicked rotor. The influence of the atoms' initial momentum distribution is studied as well as the dependence of the expected fractal dimension on finite-size effects of the experiment, such as finite detection windows and short measurement times. Our results show that clear signatures of fractality could be observed in experiments with cold atoms subjected to periodically flashed optical lattices, which offer an excellent control on interaction times and the initial atomic ensemble. \\ ( http://arXiv.org/abs/nlin/0512002 , 504kb) ------------------------------------------------------------------------------ \\ Paper: quant-ph/0512043 Date: Tue, 6 Dec 2005 12:53:21 GMT (36kb) Title: Exploring surface interactions with atom chips Authors: Carsten Henkel Comments: to be submitted to Rev Mod Phys; comments and additions are welcome! \\ We review the current status of the field of atom-surface interactions, with an emphasis on the regimes specific to atom chips. Recent developments in theory and experiment are highlighted. In particular, atom-surface interactions define physical limits for miniaturization and coherent operation. This implies constraints for applications in quantum information processing or matter wave interferometry. We focus on atom-surface interaction potentials induced by vacuum fluctuations (Van der Waals and Casimir-Polder forces), and on transitions between atomic quantum states that are induced by thermally excited magnetic near fields. Open questions and current challenges are sketched. \\ ( http://arXiv.org/abs/quant-ph/0512043 , 36kb) ------------------------------------------------------------------------------ \\ Paper: physics/0512041 Date: Tue, 6 Dec 2005 08:07:44 GMT (41kb) Title: Self-sustained oscillations in a Large Magneto-Optical Trap Authors: Guillaume Labeyrie (INLN), Franck Michaud (INLN), Robin Kaiser (INLN) Comments: submitted to Phys. Rev. Lett. 4 pages, 3 figures Proxy: ccsd ccsd-00015277 Subj-class: Atomic Physics; Plasma Physics \\ We have observed self-sustained radial oscillations in a large magneto-optical trap (MOT), containing up to $10^{10}$ Rb$^{85}$ atoms. This instability is due to the competition between the confining force of the MOT and the repulsive interaction associated with multiple scattering of light inside the cold atomic cloud. A simple analytical model allows us to formulate a criterion for the instability threshold, in fair agreement with our observations. This criterion shows that large numbers of trapped atoms $N>10^9$ are required to observe this unstable behavior. \\ ( http://arXiv.org/abs/physics/0512041 , 41kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0512134 Date: Wed, 7 Dec 2005 00:08:01 GMT (31kb) Title: Acoustic attenuation probe for fermion superfluidity in ultracold atom gases Authors: Sergio Gaudio (1)(2), B. Mihaila (2), K. B. Blagoev (2), K. S. Bedell (1), Eddy Timmermans (2) (1) (Department of Physics, Boston College) (2) (Theoretical Division, Los Alamos Natl Labs) Comments: 5 pages, 2 figures. submitted to PRL Report-no: LAUR-05-3432 Subj-class: Other \\ Dilute gas Bose-Einstein condensates (BEC's), currently used to cool fermionic atoms in atom traps, can also probe the superfluidity of these fermions. The damping rate of BEC-acoustic excitations (phonon modes), measured in the middle of the trap as a function of the phonon momentum, yields an unambiguous signature of BCS-like superfluidity, provides a measurement of the superfluid gap parameter and gives an estimate of the size of the Cooper-pairs in the BEC-BCS crossover regime. We also predict kinks in the momentum dependence of the damping rate which can reveal detailed information about the fermion quasi-particle dispersion relation. \\ ( http://arXiv.org/abs/cond-mat/0512134 , 31kb) ------------------------------------------------------------------------------ \\ Paper (*cross-listing*): physics/0512033 Date: Mon, 5 Dec 2005 16:13:07 GMT (33kb) Title: One-dimensional Bose chemistry: effects of non-integrability Authors: V. A. Yurovsky (1), A. Ben-Reuven (1) and M. Olshanii (2) ((1) Tel-Aviv University, (2)University of Southern California) Comments: 5 pages, 4 figures Subj-class: Atomic Physics; Soft Condensed Matter \\ Three-body collisions of ultracold identical Bose atoms under tight cylindrical confinement are analyzed. A Feshbach resonance in two-body collisions is described by a two-channel zero-range interaction. Elimination of the closed channel in the three-body problem reduces the interaction to a one-channel zero-range one with an energy dependent strength. The related problem with an energy independent strength (the Lieb-Liniger-McGuire model) has an exact solution and forbids all chemical processes, such as three-atom association and diatom dissociation, as well as reflection in atom-diatom collisions. The resonant case is analyzed by a numerical solution of the Faddeev-Lovelace equations. The results demonstrate that as the internal symmetry of the Lieb-Liniger-McGuire model is lifted, the reflection and chemical reactions become allowed and may be observed in experiments. \\ ( http://arXiv.org/abs/physics/0512033 , 33kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0505697 replaced with revised version Wed, 7 Dec 2005 06:42:52 GMT (94kb) Title: Enhanced Quantum Reflection of Matter-Wave Solitons Authors: Chaohong Lee and Joachim Brand Comments: 7 pages, 3 figures, to be published in Europhys. Lett Subj-class: Other; Pattern Formation and Solitons \\ ( http://arXiv.org/abs/cond-mat/0505697 , 94kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0506419 replaced with revised version Wed, 7 Dec 2005 00:26:39 GMT (93kb) Title: Finite-temperature properties of hard-core bosons confined on one-dimensional optical lattices Authors: Marcos Rigol Comments: RevTex file, 12 pages, 16 figures, published version Subj-class: Statistical Mechanics; Other Journal-ref: Phys. Rev. A 72, 063607 (2005) DOI: 10.1103/PhysRevA.72.063607 \\ ( http://arXiv.org/abs/cond-mat/0506419 , 93kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0507391 replaced with revised version Wed, 7 Dec 2005 10:07:27 GMT (31kb) Title: Expansion of the Gibbs potential for quantum many-body systems: General formalism with applications to the spin glass and the weakly non-ideal Bose gas Authors: T. Plefka Comments: 17 pages, 0 figures; revised version accepted by Phys Rev E Subj-class: Statistical Mechanics; Disordered Systems and Neural Networks \\ ( http://arXiv.org/abs/cond-mat/0507391 , 31kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0509560 replaced with revised version Tue, 6 Dec 2005 21:59:27 GMT (64kb) Title: Phase coherence, visibility, and the superfluid--Mott-insulator transition on one-dimensional optical lattices Authors: P. Sengupta, M. Rigol, G. G. Batrouni, P. J. H. Denteneer, R. T. Scalettar Comments: 4 pages, 5 figures Subj-class: Other Journal-ref: Phys. Rev. Lett. 95, 220402 (2005) \\ ( http://arXiv.org/abs/cond-mat/0509560 , 64kb) ------------------------------------------------------------------------------ \\ Paper: quant-ph/0512056 Date: Wed, 7 Dec 2005 12:17:22 GMT (102kb) Title: Paramagnetic Faraday rotation with spin-polarized ytterbium atoms Authors: M. Takeuchi, T. Takano, S. Ichihara, Y. Takasu, M. Kumakura, T. Yabuzaki and Y. Takahashi Comments: 8 pages, 20 figures \\ We report observation of the paramagnetic Faraday rotation of spin-polarized ytterbium (Yb) atoms. As the sample of the atoms, we used atomic beam, released atom from magneto-optical trap (MOT), and trapped atoms in far-off-resonant trap (FORT). Since Yb is diamagnetic and has spin-1/2 isotope, it is an ideal sample for the spin physics, such as quantum non-demolition measurement of spin (spin QND), for example. From the results of the rotation angle, we confirmed that the atoms were almost perfectly polarized. \\ ( http://arXiv.org/abs/quant-ph/0512056 , 102kb) ------------------------------------------------------------------------------ \\ Paper: physics/0512065 Date: Wed, 7 Dec 2005 20:54:18 GMT (71kb) Title: Laser cooling of new atomic and molecular species with ultrafast pulses Authors: D. Kielpinski Comments: revision of quant-ph/0306099, submitted to PRA Subj-class: Atomic Physics \\ We propose a new laser cooling method for atomic species whose level structure makes traditional laser cooling difficult. For instance, laser cooling of hydrogen requires single-frequency vacuum-ultraviolet light, while multielectron atoms need single-frequency light at many widely separated frequencies. These restrictions can be eased by laser cooling on two-photon transitions with ultrafast pulse trains. Laser cooling of hydrogen, antihydrogen, and many other species appears feasible, and extension of the technique to molecules may be possible. \\ ( http://arXiv.org/abs/physics/0512065 , 71kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0512169 Date: Thu, 8 Dec 2005 08:50:23 GMT (453kb) Title: A new class of exact solitary wave solutions of one dimensional Gross-Pitaevskii equation Authors: Rajneesh Atre, Prasanta K. Panigrahi and G.S. Agarwal Comments: 4 pages, 4 eps figures Subj-class: Other \\ We present a large family of {\it{exact}} solitary wave solutions of the one dimensional Gross-Pitaevskii equation, with time-varying scattering length and gain/loss, in both expulsive and regular parabolic confinement regimes. The consistency condition governing the soliton profiles is shown to map on to a {\it{linear}} Schr\"odinger eigenvalue problem, thereby enabling one to find analytically the effect of a wide variety of temporal variations in the control parameters, which are experimentally realizable. Corresponding to each solvable quantum mechanical system, one can identify a soliton configuration. These include soliton trains in close analogy to experimental observations of Strecker {\it{et al.,}} [Nature {\bf{{417}}{150}{2002}], spatio-temporal dynamics, solitons undergoing rapid amplification, collapse and revival of condensates and analytical expression of two-soliton bound states, to name a few. \\ ( http://arXiv.org/abs/cond-mat/0512169 , 453kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0508326 replaced with revised version Wed, 7 Dec 2005 22:24:29 GMT (407kb) Title: Bragg Spectroscopy of Vortex Lattices in Bose-Einstein condensates Authors: S. R. Muniz, D. S. Naik and C. Raman Comments: 5 pages, 5 Figures, A movie built from the CM data is available in our Webpage: http://www.physics.gatech.edu/chandra/index.htm; added Fig.5 presents new data, showing signatures of the microscopic vortex structure in the diffracted cloud Subj-class: Other \\ ( http://arXiv.org/abs/cond-mat/0508326 , 407kb) ------------------------------------------------------------------------------ \\ Paper: quant-ph/0512061 Date: Thu, 8 Dec 2005 08:18:32 GMT (178kb) Title: Highly versatile atomic micro traps generated by multifrequency magnetic field modulation Authors: Ph.W. Courteille, B. Deh, J. Fort\'agh, A. G\"unther, S. Kraft, C. Marzok, S. Slama, and C. Zimmermann Comments: 12 pages, 6 figures \\ We propose the realization of custom-designed adiabatic potentials for cold atoms based on multimode radio frequency radiation in combination with static inhomogeneous magnetic fields. For example, the use of radio frequency combs gives rise to periodic potentials acting as gratings for cold atoms. In strong magnetic field gradients the lattice constant can be well below 1 micrometer. By changing the frequencies of the comb in time the gratings can easily be propagated in space, which may prove useful for Bragg scattering atomic matter waves. Furthermore, almost arbitrarily shaped potential are possible such as disordered potentials on a scale of several 100 nm or lattices with a spatially varying lattice constant. The potentials can be made state selective and, in the case of atomic mixtures, also species selective. This opens new perspectives for generating tailored quantum systems based on ultra cold single atoms or degenerate atomic and molecular quantum gases. \\ ( http://arXiv.org/abs/quant-ph/0512061 , 178kb) ------------------------------------------------------------------------------Received on Fri Dec 09 2005 - 17:19:33 EST

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