The following message was sent to the matts_arxiv list by Matthew Davis <mdavis_at_physics.uq.edu.au>
Hello all,
This list has now reached 75 subscribers. Please continue to spread the word:
http://www.physics.uq.edu.au/people/mdavis/matts_arXiv/
Look out for Ulf Leonhardt's paper on invisibility devices... not exactly
ultracold gases I know, but it caught my eye!
Cheers,
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/0602245 Date: Thu, 9 Feb 2006 21:04:40 GMT (65kb) Title: Competing Orders in two-dimensional Bose-Fermi mixtures Authors: L. Mathey, S-W. Tsai, A.H. Castro Neto Comments: 4 pages, 3 figures Subj-class: Other \\ Using a functional renormalization group approach we study the zero temperature phase diagram of two-dimensional Bose-Fermi mixtures of ultra-cold atoms in optical lattices, in the limit when the velocity of bosonic fluctuations are much larger than the Fermi velocity. For spin-1/2 fermions we obtain a phase diagram, which shows a competition of pairing phases of various orbital symmetry ($s$, $p$, and $d$) and antiferromagnetic order. We determine the value of the gaps of various phases close to half-filling, and identify subdominant orders as well as short-range fluctuations from the RG flow. For spinless fermions we find that p-wave pairing dominates the phase diagram. \\ ( http://arXiv.org/abs/cond-mat/0602245 , 65kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0602274 Date: Fri, 10 Feb 2006 19:02:13 GMT (25kb) Title: Induced P-wave Superfluidity in Asymmetric Fermi Gases Authors: Aurel Bulgac, Michael McNeil Forbes, Achim Schwenk Comments: 4 pages, 2 figures Subj-class: Other; Superconductivity \\ We show that two new intra-species P-wave superfluid phases appear in two-component asymmetric Fermi systems with short-range S-wave interactions. In the BEC limit, phonons of the molecular BEC induce P-wave superfluidity in the excess fermions. In the BCS limit, density fluctuations induce P-wave superfluidity in both the majority and the minority species. These phases may be realized in experiments with spin-polarized Fermi gases. \\ ( http://arXiv.org/abs/cond-mat/0602274 , 25kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0511547 replaced with revised version Fri, 10 Feb 2006 14:59:03 GMT (201kb) Title: Low lying twisting and acoustic modes of a rotating Bose-Einstein condensate Authors: Fr\'{e}d\'{e}ric Chevy (LKB - Lhomond) Comments: 4 pages, 2 figures Proxy: ccsd ccsd-00014252 Subj-class: Mesoscopic Systems and Quantum Hall Effect \\ ( http://arXiv.org/abs/cond-mat/0511547 , 201kb) ------------------------------------------------------------------------------ \\ Paper: quant-ph/0602090 Date: Fri, 10 Feb 2006 09:42:28 GMT (253kb) Title: Dynamical generation of spin-spin entanglement via spin-independent scattering of two identical s=1/2 fermions Authors: Lucas Lamata and Juan Leon Comments: 4 pages and 3 figures. Submitted for publication \\ We consider the spin-spin entanglement between two identical fermions generated in spin-independent scattering. The spatial degrees of freedom act as ancillas for the creation of entanglement to a degree that depends on the scattering angle, $\theta$. The number of Slater determinants generated in the process is greater than 1, corresponding to genuine quantum correlations between the identical fermions. The maximal entanglement attainable of 1 e-bit is reached at $\theta=\pi/2$. We also analyze a simple $\theta$ dependent Bell's inequality, which is violated for $\pi/4<\theta\leq\pi/2$. This phenomenon is unrelated to the symmetrization postulate but does not appear for unequal particles. \\ ( http://arXiv.org/abs/quant-ph/0602090 , 253kb) ------------------------------------------------------------------------------ \\ Paper: physics/0602075 Date: Fri, 10 Feb 2006 16:54:04 GMT (275kb) Title: Self-driven nonlinear dynamics in magneto-optical traps Authors: T. Pohl, G. Labeyrie and R. Kaiser Subj-class: Atomic Physics \\ We present a theoretical model describing recently observed collective effects in large magneto-optically trapped atomic ensembles. Based on a kinetic description we develop an efficient test particle method, which in addition to the single atom light pressure accounts for other relevant effects such as laser attenuation and forces due to multiply scattered light with position dependent absorption cross sections. Our calculations confirm the existence of a dynamical instability and provide deeper insights into the observed system dynamics. \\ ( http://arXiv.org/abs/physics/0602075 , 275kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0602278 Date: Sun, 12 Feb 2006 22:26:27 GMT (169kb) Title: Vortex-Peierls States in Optical Lattices Authors: A.A. Burkov, Eugene Demler Comments: 5 pages, 4 figures Subj-class: Strongly Correlated Electrons; Superconductivity \\ We show that vortices, induced in cold atom superfluids in optical lattices, may order in a novel vortex-Peierls ground state. In such a state vortices do not form a simple lattice but arrange themselves in clusters, within which the vortices are partially delocalized, tunneling between classically degenerate configurations. We demonstrate that this exotic quantum many-body state is selected by an order-from-disorder mechanism for a special combination of the vortex filling and lattice geometry that has a macroscopic number of classically degenerate ground states. \\ ( http://arXiv.org/abs/cond-mat/0602278 , 169kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0602283 Date: Sat, 11 Feb 2006 00:58:41 GMT (118kb) Title: Time of flight observables and the formation of Mott domains of fermions and bosons on optical lattices Authors: M. Rigol, R. T. Scalettar, P. Sengupta, and G. G. Batrouni Comments: 4 pages, 6 figures, to appear in PRB(R) Subj-class: Strongly Correlated Electrons; Superconductivity \\ We study, using quantum Monte-Carlo simulations, the energetics of the formation of Mott domains of fermions and bosons trapped on one-dimensional lattices. We show that, in both cases, the sum of kinetic and interaction energies exhibits minima when Mott domains appear in the trap. In addition, we examine the derivatives of the kinetic and interaction energies, and of their sum, which display clear signatures of the Mott transition. We discuss the relevance of these findings to time of flight experiments that could allow the detection of the metal--Mott-insulator transition in confined fermions on optical lattices, and support established results on the superfluid--Mott-insulator transition in confined bosons on optical lattices. \\ ( http://arXiv.org/abs/cond-mat/0602283 , 118kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0602299 Date: Mon, 13 Feb 2006 10:10:34 GMT (167kb) Title: Entanglement production with multimode Bose-Einstein condensates in optical lattices Authors: V.I. Yukalov and E.P. Yukalova Comments: Latex file, 16 pages, 7 figures Subj-class: Mesoscopic Systems and Quantum Hall Effect; Statistical Mechanics Journal-ref: Laser Phys. 16 (2006) 354-359 \\ Deep optical lattices are considered, in each site of which there are many Bose-condensed atoms. By the resonant modulation of trapping potentials it is possible to transfer a macroscopic portion of atoms to the collective nonlinear states corresponding to topological coherent modes. Entanglement can be generated between these modes. By varying the resonant modulating field it is possible to effectively regulate entanglement production in this multimode multitrap system of Bose condensates. \\ ( http://arXiv.org/abs/cond-mat/0602299 , 167kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0511036 replaced with revised version Sat, 11 Feb 2006 21:43:00 GMT (27kb) Title: Coupled-channel pseudo-potential description of the Feshbach resonance in two dimensions Authors: K. Kanjilal and D. Blume Comments: 4 pages, 3 figures Subj-class: Other \\ ( http://arXiv.org/abs/cond-mat/0511036 , 27kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0511746 replaced with revised version Sun, 12 Feb 2006 11:16:47 GMT (352kb) Title: Strongly correlated Fermi-Bose mixtures in disordered optical lattices Authors: L. Sanchez-Palencia (LCFIO), V. Ahufinger, A. Kantian, Jakub Zakrzewski, A. Sanpera, M. Lewenstein Comments: Proceedings of the 3rd International Workshop on `Theory of Quantum Gases and Quantum Coherence' Proxy: ccsd ccsd-00014953 Subj-class: Other \\ ( http://arXiv.org/abs/cond-mat/0511746 , 352kb) ------------------------------------------------------------------------------ \\ Paper: quant-ph/0505074 replaced with revised version Mon, 13 Feb 2006 07:28:22 GMT (9kb) Title: Ultimate decoherence border for matter-wave interferometry Authors: Brahim Lamine (LKB - Jussieu), R\'{e}my Herv\'{e} (LKB - Jussieu), Astrid Lambrecht (LKB - Jussieu), Serge Reynaud (LKB - Jussieu) Comments: 4 pages Proxy: ccsd ccsd-00004899 Journal-ref: Physical Review Letters 96 (2006) 050405 DOI: 10.1103/PhysRevLett.96.050405 \\ ( http://arXiv.org/abs/quant-ph/0505074 , 9kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0602319 Date: Mon, 13 Feb 2006 22:45:37 GMT (99kb) Title: Searching for a Supersolid in Cold Atom Optical Lattices and More Authors: V.W. Scarola, E. Demler, and S. Das Sarma Comments: 5 pages, 4 figures Subj-class: Other \\ We suggest a technique for the observation of a predicted supersolid phase in extended Bose-Hubbard models which are potentially realizable in cold atom optical lattice systems. In particular, we discuss important subtleties arising from the existence of the trapping potential which leads to an externally imposed (as opposed to spontaneous) breaking of translational invariance. We show, by carefully including the trapping potential in our theoretical formalism, that noise correlations could prove instrumental in identifying the supersolid and density wave phases. We also find that the noise correlation peak shape allows for a determination of the relative size of trapped Mott domains. \\ ( http://arXiv.org/abs/cond-mat/0602319 , 99kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0602334 Date: Tue, 14 Feb 2006 13:52:07 GMT (102kb) Title: Hysteresis effects in rotating Bose-Einstein condensates Authors: B. Jackson and C. F. Barenghi Comments: 6 pages, 7 figures Subj-class: Statistical Mechanics \\ We consider the formation of vortices in a dilute Bose-Einstein condensate confined in a rotating anisotropic trap. We find that the number of vortices and angular momentum attained by the condensate depends upon the rotation history of the trap and on the number of vortices present in the condensate initially. We discuss this effect in terms of the resonant frequency of the quadrupole mode, which shifts according to the rotation velocity of the condensate. Differences between the spin-up and spin-down response of the condensate are found, demonstrating hysteresis phenomena in this system. \\ ( http://arXiv.org/abs/cond-mat/0602334 , 102kb) ------------------------------------------------------------------------------ \\ Paper: quant-ph/0511070 Date: Tue, 8 Nov 2005 06:11:50 GMT (60kb) Date (revised v2): Sun, 12 Feb 2006 20:25:16 GMT (202kb) Title: Classical simulation of quantum many-body systems with a tree tensor network Authors: Yaoyun Shi and Luming Duan and Guifre Vidal Comments: 4 pages,7 figures Subj-class: Quantum Physics; Strongly Correlated Electrons \\ We show how to efficiently simulate a quantum many-body system with tree structure when its entanglement is bounded for any bipartite split along an edge of the tree. This is achieved by expanding the {\em time-evolving block decimation} simulation algorithm for time evolution from a one dimensional lattice to a tree graph, while replacing a {\em matrix product state} with a {\em tree tensor network}. As an application, we show that any one-way quantum computation on a tree graph can be efficiently simulated with a classical computer. \\ ( http://arXiv.org/abs/quant-ph/0511070 , 202kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0503264 replaced with revised version Tue, 14 Feb 2006 05:25:07 GMT (69kb) Title: Finite Temperature Excitations of an anisotropically trapped Bose gas : A diffusion Monte Carlo study Authors: S. Datta Comments: 27pages,15 figures Subj-class: Other \\ ( http://arXiv.org/abs/cond-mat/0503264 , 69kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0503511 replaced with revised version Tue, 14 Feb 2006 12:58:46 GMT (36kb) Title: Dynamics of a Quantum Phase Transition Authors: Wojciech H. Zurek, Uwe Dorner, Peter Zoller Comments: 4 pages, 3 figures. Replaced by revised version Subj-class: Statistical Mechanics Journal-ref: Phys. Rev. Lett. 95, 105701 (2005) DOI: 10.1103/PhysRevLett.95.105701 \\ ( http://arXiv.org/abs/cond-mat/0503511 , 36kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0508430 replaced with revised version Tue, 14 Feb 2006 20:56:58 GMT (62kb) Title: BEC-BCS crossover in "magnetized" Feshbach-resonantly paired superfluids Authors: Daniel E. Sheehy, Leo Radzihovsky (University of Colorado) Comments: 4 RevTeX pages, 2 figures. Minor changes from previous version Subj-class: Superconductivity; Statistical Mechanics Journal-ref: PRL 96, 060401 (2006) \\ ( http://arXiv.org/abs/cond-mat/0508430 , 62kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0602055 replaced with revised version Tue, 14 Feb 2006 05:03:25 GMT (28kb) Title: Bose Einstein Condensation of incommensurate solid 4He Authors: D. E. Galli and L. Reatto Comments: 5 pages, 2 figures Subj-class: Other; Statistical Mechanics \\ ( http://arXiv.org/abs/cond-mat/0602055 , 28kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0602305 Date: Mon, 13 Feb 2006 16:52:42 GMT (20kb) Title: Numerical methods for time evolution of Matrix Product States Authors: Juan Jose Garcia-Ripoll Subj-class: Strongly Correlated Electrons \\ In this work we develop several new simulation algorithms for 1D many-body quantum mechanical systems combining the Matrix Product State variational ansatz with Taylor, Pade and Arnoldi approximations to the evolution operator. By comparing all methods with previous techniques based on Trotter decompositions we demonstrate that the Arnoldi method is the best one, reaching extremely good accuracy with moderate resources. Finally we apply this algorithm to studying the formation of molecules in an optical lattices when crossing a Feschbach resonance with a cloud of two-species hard-core bosons. \\ ( http://arXiv.org/abs/cond-mat/0602305 , 20kb) ------------------------------------------------------------------------------ \\ Paper: physics/0602092 Date: Tue, 14 Feb 2006 10:34:07 GMT (333kb) Title: Optical Conformal Mapping and Dielectric Invisibility Devices Authors: Ulf Leonhardt Comments: I decline commenting to journalists about this paper before it is accepted by peer review Subj-class: Optics \\ An invisibility device should guide light around an object as if nothing were there, regardless where the light comes from. Ideal invisibility devices are impossible due to the wave nature of light. This paper develops a general recipe for the design of media that create perfect invisibility within the accuracy of geometrical optics. Here the imperfections of invisibility can be made arbitrarily small to hide objects that are much larger than the wavelength. Using modern metamaterials, practical demonstrations of such devices seem possible. The method developed here can be also applied to escape from detection by other forms of waves such as sound. \\ ( http://arXiv.org/abs/physics/0602092 , 333kb) ------------------------------------------------------------------------------ \\ Paper: physics/0510268 replaced with revised version Tue, 14 Feb 2006 20:15:46 GMT (100kb) Title: Predictions of laser-cooling temperatures for multilevel atoms in three-dimensional polarization-gradient fields Authors: Josh W. Dunn and Chris H. Greene Comments: 21 pages, 4 figures, LaTeX; minor revisions, shortened appendix Subj-class: Atomic Physics \\ ( http://arXiv.org/abs/physics/0510268 , 100kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0602343 Date: Tue, 14 Feb 2006 22:56:04 GMT (153kb) Title: Theory of Raman superradiance imaging of condensed Bose gases Authors: H. Uys and P. Meystre Comments: 9 pages, 9 figures Subj-class: Other \\ We investigate the off-resonant superradiant Raman scattering of light from a cigar-shaped atomic Bose-Einstein condensate. Superradiant emission has been proposed as applied to the imaging of quantum-degenerate atomic system, as it yields a stronger image contrast than conventional incoherent scattering. Our multimode theory is in good agreement with the time-dependent spatial features observed in superradiant absorption imaging, and the inclusion of quantum fluctuations in the initial stages of the superradiant emission account well for shot-to-shot fluctuations observed in experiments. \\ ( http://arXiv.org/abs/cond-mat/0602343 , 153kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0602346 Date: Wed, 15 Feb 2006 08:31:52 GMT (729kb) Title: Measurement of Phase Coherence during the Growth of an Elongated Condensate Authors: Mathilde Hugbart (LCFIO), Jocelyn A. Retter (LCFIO), Andres Var\`{o}n (LCFIO), Philippe Bouyer (LCFIO), Alain Aspect (LCFIO) Proxy: ccsd ccsd-00018350 Subj-class: Other \\ We study the growth of an elongated condensate from a non-equilibrium thermal cloud obtained by shock-cooling. Quantitative measurements using momentum Bragg spectroscopy reveal the evolution of the phase coherence length as the condensate grows to equilibrium. A broadening of the momentum distribution compared to that expected at equilibrium is observed at early times. This broadening is compatible with damped quadrupole oscillations. \\ ( http://arXiv.org/abs/cond-mat/0602346 , 729kb) ------------------------------------------------------------------------------ \\ Paper: quant-ph/0602118 Date: Tue, 14 Feb 2006 23:54:28 GMT (98kb) Title: Highly nonclassical photon statistics in parametric down conversion Authors: Edo Waks, Barry Sanders, Eleni Diamanti, and Yoshihisa Yamamoto \\ We use photon counters to obtain the joint photon counting statistics from twin-beam non-degenerate parametric down conversion, and we demonstrate directly, and with no auxiliary assumptions, that these twin beams are nonclassical. \\ ( http://arXiv.org/abs/quant-ph/0602118 , 98kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0602319 Date: Mon, 13 Feb 2006 22:45:37 GMT (99kb) Title: Searching for a Supersolid in Cold Atom Optical Lattices and More Authors: V.W. Scarola, E. Demler, and S. Das Sarma Comments: 5 pages, 4 figures Subj-class: Other \\ We suggest a technique for the observation of a predicted supersolid phase in extended Bose-Hubbard models which are potentially realizable in cold atom optical lattice systems. In particular, we discuss important subtleties arising from the existence of the trapping potential which leads to an externally imposed (as opposed to spontaneous) breaking of translational invariance. We show, by carefully including the trapping potential in our theoretical formalism, that noise correlations could prove instrumental in identifying the supersolid and density wave phases. We also find that the noise correlation peak shape allows for a determination of the relative size of trapped Mott domains. \\ ( http://arXiv.org/abs/cond-mat/0602319 , 99kb) ------------------------------------------------------------------------------ \\ Paper: quant-ph/0602131 Date: Wed, 15 Feb 2006 21:15:20 GMT (304kb) Title: Slow light in paraffin-coated Rb vapor cells Authors: M. Klein, I. Novikova, D.F. Phillips, R.L. Walsworth (Harvard-Smithsonian Center for Astrophysics) Comments: 6 pages, 6 figures, submitted to Journal of Modern Optics \\ We present preliminary results from an experimental study of slow light in anti-relaxation-coated Rb vapor cells, and describe the construction and testing of such cells. The slow ground state decoherence rate allowed by coated cell walls leads to a dual-structured electromagnetically induced transparency (EIT) spectrum with a very narrow (<100 Hz) transparency peak on top of a broad pedestal. Such dual-structure EIT permits optical probe pulses to propagate with greatly reduced group velocity on two time scales. We discuss ongoing efforts to optimize the pulse delay in such coated cell systems. \\ ( http://arXiv.org/abs/quant-ph/0602131 , 304kb) ------------------------------------------------------------------------------ \\ Paper: quant-ph/0602132 Date: Thu, 16 Feb 2006 00:02:21 GMT (512kb) Title: A quantum study of multi-bit phase coding for optical storage Authors: Magnus T.L. Hsu, Vincent Delaubert, Warwick P. Bowen, Claude Fabre, Hans-A. Bachor and Ping Koy Lam Comments: 8 pages, 7 figures (Please email author for a PDF file if the manuscript does not turn out properly) \\ We propose a scheme which encodes information in both the longitudinal and spatial transverse phases of a continuous-wave optical beam. A split detector-based interferometric scheme is then introduced to optimally detect both encoded phase signals. In contrast to present-day optical storage devices, our phase coding scheme has an information storage capacity which scales with the power of the read-out optical beam. We analyse the maximum number of encoding possibilities at the shot noise limit. In addition, we show that using squeezed light, the shot noise limit can be overcome and the number of encoding possibilities increased. We discuss a possible application of our phase coding scheme for increasing the capacities of optical storage devices. \\ ( http://arXiv.org/abs/quant-ph/0602132 , 512kb) ------------------------------------------------------------------------------ \\ Paper: physics/0602108 Date: Wed, 15 Feb 2006 22:08:04 GMT (516kb) Title: All-optical generation and photoassociative probing of sodium Bose-Einstein condensates Authors: R. Dumke, M. Johanning, E. Gomez, J. D. Weinstein, K. M. Jones and P. D. Lett Comments: 8 pages, 10 figures Subj-class: Atomic Physics \\ We demonsatrate an all optical technique to evaporatively produce sodium Bose-Einstein condensates (BEC). We use a crossed-dipole trap formed from light near 1060 nm, and a simple ramp of the intensity to force evaporation. In addition, we introduce photoassociation as diagnostic of the trap loading process, and show that it can be used to detect the onset of Bose-Einstein condensation. Finally, we demonstrate the straightforward production of multiple traps with condensates using this technique, and that some control over the spinor state of the BEC is achieved by positioning the trap as well. \\ ( http://arXiv.org/abs/physics/0602108 , 516kb) ------------------------------------------------------------------------------ \\ Paper: physics/0602109 Date: Wed, 15 Feb 2006 22:22:38 GMT (193kb) Title: Nonlinear magneto-optical rotation with frequency-modulated light in the geophysical field range Authors: V. Acosta, M. P. Ledbetter, S. M. Rochester, D. Budker, D. F. Jackson-Kimball, D. C. Hovde, W. Gawlik, S. Pustelny, J. Zachorowski Comments: 8 pages, 8 figures Subj-class: Atomic Physics \\ Recent work investigating resonant nonlinear magneto-optical rotation (NMOR) related to long-lived ($\tau\ts{rel} \sim 1~{\rm s}$) ground-state atomic coherences has demonstrated potential magnetometric sensitivities exceeding $10^{-11}~{\rm G/\sqrt{Hz}}$ for small ($\lesssim 1~{\rm \mu G}$) magnetic fields. In the present work, NMOR using frequency-modulated light (FM NMOR) is studied in the regime where the longitudinal magnetic field is in the geophysical range ($\sim 500~{\rm mG}$), of particular interest for many applications. In this regime a splitting of the FM NMOR resonance due to the nonlinear Zeeman effect is observed. At sufficiently high light intensities, there is also a splitting of the FM NMOR resonances due to ac Stark shifts induced by the optical field, as well as evidence of alignment-to-orientation conversion type processes. The consequences of these effects for FM-NMOR-based atomic magnetometry in the geophysical field range are considered. \\ ( http://arXiv.org/abs/physics/0602109 , 193kb) ------------------------------------------------------------------------------Received on Mon Feb 20 2006 - 08:49:15 EST
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