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

Date: Mon, 30 Jan 2006 14:05:44 +1000 (EST)

Date: Mon, 30 Jan 2006 14:05:44 +1000 (EST)

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

Hi everyone,

Matt's arXiv selection now has a webpage where you will find an archive of

the postings I have made, as well as a short background and instructions

on how to sign up:

http://www.physics.uq.edu.au/people/mdavis/matts_arXiv/

If you can pass this around your friends in the field it would be much

appreciated!

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/0601461 Date: Fri, 20 Jan 2006 02:04:20 GMT (43kb) Title: Pairing Symmetry in the Anisotropic Fermi Superfluid under p-wave Feshbach Resonance Authors: Chi-Ho Cheng and Sung-Kit Yip Comments: 12 pages, 7 figures Subj-class: Other; Superconductivity \\ The anisotropic Fermi superfluid of ultra-cold Fermi atoms under the p-wave Feshbach resonance is studied theoretically. The pairing symmetry of the ground state is determined by the strength of the atom-atom magnetic dipole interaction. It is $k_z$ for a strong dipole interaction; while it becomes $k_z - i \beta k_y$, up to a rotation about z, for a weak one (Here $\beta$ < 1 is a numerical coefficient). By changing the external magnetic field or the atomic gas density, a phase transition between these two states can be driven. We discuss how the pairing symmetry of the ground state can be determined in the time-of-flight experiments. \\ ( http://arXiv.org/abs/cond-mat/0601461 , 43kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0509154 replaced with revised version Fri, 20 Jan 2006 19:14:33 GMT (237kb) Title: Quasi-condensate growth on an atom chip Authors: N.P. Proukakis, J. Schmiedmayer and H.T.C. Stoof Comments: Detailed Discussion (11 Pages, 7 Fig), Classification of Accessible Regimes, Description of Experimental Techniques Subj-class: Statistical Mechanics \\ ( http://arXiv.org/abs/cond-mat/0509154 , 237kb) ------------------------------------------------------------------------------ \\ Paper (*cross-listing*): math-ph/0509060 replaced with revised version Thu, 19 Jan 2006 22:17:28 GMT (29kb) Title: Mott transition in lattice boson models Authors: Roberto Fernandez, Juerg Froehlich, Daniel Ueltschi Comments: 20 pages Subj-class: Mathematical Physics; Statistical Mechanics MSC-class: 82B10, 82B20, 82B26 \\ ( http://arXiv.org/abs/math-ph/0509060 , 29kb) ----------------------------------------------------------------------------- \\ Paper: quant-ph/0601137 Date: Fri, 20 Jan 2006 10:15:12 GMT (441kb) Title: Theoretical study of a cold atom beam splitter Authors: Naceur Gaaloul (LPM, LSAMA), Annick Suzor-Weiner (LPM), Laurence Pruvost (LAC), Mourad Telmini (LSAMA), Eric Charron (LPM) Proxy: ccsd ccsd-00017414 \\ A theoretical model is presented for the study of the dynamics of a cold atomic cloud falling in the gravity field in the presence of two crossing dipole guides. The cloud is splitted between the two branches of the guide, and we compare experimental measurements of the splitting efficiency with semi-classical simulations. We then explore the possibilities of optimization of this beam splitter. Our numerical study also gives access to detailed informations, such as the atom temperature after the splitting. It finally sets the foundation for a study of the coherence properties of the guided atoms. \\ ( http://arXiv.org/abs/quant-ph/0601137 , 441kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0601496 Date: Mon, 23 Jan 2006 12:14:53 GMT (365kb) Title: Phase separation of two species of fermionic atoms in one-dimensional optical lattice Authors: Shi-Jian Gu, Rui Fan, and Hai-Qing Lin Comments: 5 pages, 5 figures Subj-class: Strongly Correlated Electrons \\ Motivated by recent development in cold-atomic systems, we study the ground-state phase diagram of two species of fermionic atoms in one-dimensional optical lattice, as described by an asymmetric Hubbard model. The quantum phase transition from density wave to phase separation is investigated by studying both the corresponding charge order parameter and quantum entanglement. A rigorous prove, that even for the case of a single hole doping, the density wave is unstable to the phase separation in the infinite $U$ limit, is given. Therefore, our results are quite instructive for both on-going experiments on strongly correlated cold-atomic systems and traditional heavy fermion systems. \\ ( http://arXiv.org/abs/cond-mat/0601496 , 365kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0601500 Date: Sun, 22 Jan 2006 22:16:06 GMT (17kb) Title: Thermodynamically activated vortex-dipole formation in a two-dimensional Bose-Einstein condensate Authors: Daniel Schumayer and David A. W. Hutchinson Comments: 5 pages, 3 figures Subj-class: Statistical Mechanics \\ Three distinct types of behaviour have recently been identified in the two-dimensional trapped bosonic gas, namely Bose-Einstein condensate, Berezinskii-Kosterlitz-Thouless-type (BKT) superfluid and normal gas phases in order of increasing temperature. In the BKT phase above a critical temperature $T_{\mathrm{c}}$, the system favours the formation of vortex-antivortex pairs, since the free energy is lowered by this topological defect. We calculate how the minima of free energy vary as a function of the distance between the vortex-antivortex excitation and the condensate centre for various particle numbers. We also examine the formation of the minima in the free energy as a function of temperature to gain insight into the thermodynamic stability of these phases. Our results qualitatively agree with the findings of classical field simulations. \\ ( http://arXiv.org/abs/cond-mat/0601500 , 17kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0601512 Date: Mon, 23 Jan 2006 11:47:39 GMT (16kb) Title: Optimal trap shape for a Bose gas with attractive interactions Authors: V.I. Yukalov and E.P. Yukalova Comments: Latex file, 21 pages Subj-class: Mesoscopic Systems and Quantum Hall Effect; Statistical Mechanics Journal-ref: Phys. Rev. A 72 (2005) 063611-10 \\ Dilute Bose gas with attractive interactions is considered at zero temperature, when practically all atoms are in Bose-Einstein condensate. The problem is addressed aiming at answering the question: What is the optimal trap shape allowing for the condensation of the maximal number of atoms with negative scattering lengths? Simple and accurate analytical formulas are derived allowing for an easy analysis of the optimal trap shapes. These analytical formulas are the main result of the paper. \\ ( http://arXiv.org/abs/cond-mat/0601512 , 16kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0407075 replaced with revised version Mon, 23 Jan 2006 13:51:31 GMT (32kb) Title: Effects of finite temperature on the Mott insulator state Authors: Guido Pupillo, Carl J. Williams and Nikolay V. Prokof'ev Comments: 6 pages, 5 figures; Final version, published in PRA Subj-class: Other; Quantum Physics Journal-ref: Phys. Rev. A 73, 013408 (2006) \\ ( http://arXiv.org/abs/cond-mat/0407075 , 32kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0511341 replaced with revised version Mon, 23 Jan 2006 09:47:24 GMT (20kb) Title: Surface-atom force out of thermal equilibrium and its effect on ultra-cold atoms Authors: Mauro Antezza Comments: Submitted to JPA Special Issue QFEXT'05 Subj-class: Statistical Mechanics; Soft Condensed Matter; Atomic Physics \\ ( http://arXiv.org/abs/cond-mat/0511341 , 20kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0601140 replaced with revised version Sat, 21 Jan 2006 16:18:39 GMT (7kb) Title: Relaxation of the molecular state in atomic Fermi gases near a Feshbach resonance Authors: V. S. Babichenko Comments: RevTex4, 4 pages, corrected typos Subj-class: Other \\ ( http://arXiv.org/abs/cond-mat/0601140 , 7kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0601416 replaced with revised version Sun, 22 Jan 2006 17:32:17 GMT (11kb) Title: Unconventional strongly interacting Bose-Einstein condensates in optical lattices Authors: A. B. Kuklov Comments: Corrected and significantly revised version. Discussion of how Feynman's argument for nodeless ground states of bosons changes in the presence of the non-s-wave Feschbach resonance is added Subj-class: Other \\ ( http://arXiv.org/abs/cond-mat/0601416 , 11kb) ------------------------------------------------------------------------------ \\ Paper: physics/0601073 replaced with revised version Mon, 23 Jan 2006 12:27:31 GMT (70kb) Title: Properties of quasi-one-dimensional molecules with Feshbach resonance interaction Authors: V. A. Yurovsky (Tel Aviv University) Comments: 7 pages, 5 figures Subj-class: Atomic Physics; Soft Condensed Matter \\ ( http://arXiv.org/abs/physics/0601073 , 70kb) ------------------------------------------------------------------------------ \\ Paper: quant-ph/0601153 Date: Mon, 23 Jan 2006 09:54:39 GMT (477kb) Title: Detuned Electromagnetically Induced Transparency in an $N$-type Atom Authors: Bin Luo and Hong Guo Comments: 5 pages, 5 figures Report-no: CREAM/MS-2006-PRL-LG \\ The electromagnetically induced transparency (EIT) in an $N$ configuration is studied under both resonant and off-resonant conditions. In a certain off-resonant condition the dark state of the four-level system, which is almost the same as the resonant dark state in $\Lambda$ configuration, is rebuilt. The actual system with damping is also examined, both numerically and analytically. Based on the double dark states with frequency shifts some new potential applications, such as multi-pulse storage, can be hopefully realized. \\ ( http://arXiv.org/abs/quant-ph/0601153 , 477kb) ------------------------------------------------------------------------------ \\ Paper: quant-ph/0601154 Date: Mon, 23 Jan 2006 11:24:40 GMT (75kb) Title: Simultaneous optical trapping and detection of atoms by microdisk resonators Authors: Michael Rosenblit, Yonathan Japha, Peter Horak, Ron Folman Comments: 13 pages, 16 figures \\ We propose a scheme for simultaneously trapping and detecting single atoms near the surface of a substrate using whispering gallery modes of a microdisk resonator. For efficient atom-mode coupling the atom should be placed within approximately 150 nm from the disk. We show that a combination of red and blue detuned modes can form an optical trap at such distances while the back-action of the atom on the field modes can simultaneously be used for atom detection. We investigate these trapping potentials including van-der-Waals and Casimir-Polder forces and discuss corresponding atom detection efficiencies, depending on a variety of system parameters. Finally, we analyze the feasibility of non-destructive detection. \\ ( http://arXiv.org/abs/quant-ph/0601154 , 75kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0601539 Date: Tue, 24 Jan 2006 11:27:36 GMT (473kb) Title: Vortex structure in spinor F=2 Bose-Einstein condensates Authors: W. V. Pogosov, R. Kawate, T. Mizushima, K. Machida Comments: 6 pages, 3 figures Subj-class: Other Journal-ref: Phys. Rev. A 72, 063605 (2005) \\ Extended Gross-Pitaevskii equations for the rotating F=2 condensate in a harmonic trap are solved both numerically and variationally using trial functions for each component of the wave function. Axially-symmetric vortex solutions are analyzed and energies of polar and cyclic states are calculated. The equilibrium transitions between different phases with changing of the magnetization are studied. We show that at high magnetization the ground state of the system is determined by interaction in "density" channel, and at low magnetization spin interactions play a dominant role. Although there are five hyperfine states, all the particles are always condensed in one, two or three states. Two novel types of vortex structures are also discussed. \\ ( http://arXiv.org/abs/cond-mat/0601539 , 473kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0601542 Date: Tue, 24 Jan 2006 12:27:03 GMT (51kb) Title: A two-channel R-matrix analysis of magnetic field induced Feshbach resonances Authors: Nicolai Nygaard, Barry I. Schneider and Paul S. Julienne Comments: 11 pages, 6 figures. For additional information see http://www.phys.au.dk/quantop/Feshbach/Feshbach.shtm Subj-class: Other \\ A Feshbach resonance arises in cold atom scattering due to the complex interplay between several coupled channels. However, the essential physics of the resonance may be encapsulated in a simplified model consisting of just two coupled channels. In this paper we describe in detail how such an effective Feshbach model can be constructed from knowledge of a few key parameters, characterizing the atomic Born-Oppenheimer potentials and the low energy scattering near the resonance. These parameters may be obtained either from experiment or full coupled channels calculations. Using R-matrix theory we analyze the bound state spectrum and the scattering properties of the two-channel model, and find it to be in good agreement with exact calculations. \\ ( http://arXiv.org/abs/cond-mat/0601542 , 51kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0601550 Date: Tue, 24 Jan 2006 16:19:09 GMT (35kb) Title: Parafermionic states in rotating Bose-Einstein condensates Authors: N. Regnault, Th. Jolicoeur Comments: 23 pages, 10 figures Subj-class: Mesoscopic Systems and Quantum Hall Effect \\ We investigate possible parafermionic states in rapidly rotating ultracold bosonic atomic gases at lowest Landau level filling factor nu=k/2. We study how the system size and interactions act upon the overlap between the true ground state and a candidate Read-Rezayi state. We also consider the quasihole states which are expected to display non-Abelian statistics. We numerically evaluate the degeneracy of these states and show agreement with a formula given by E. Ardonne. We compute the overlaps between low-lying exact eigenstates and quasihole candidate wavefunctions. We discuss the validity of the parafermion description as a function of the filling factor. \\ ( http://arXiv.org/abs/cond-mat/0601550 , 35kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0509211 replaced with revised version Tue, 24 Jan 2006 10:11:20 GMT (303kb) Title: Molecules of Fermionic Atoms in an Optical Lattice Authors: Thilo St\"oferle, Henning Moritz, Kenneth G\"unter, Michael K\"ohl, Tilman Esslinger Comments: 4 pages Subj-class: Strongly Correlated Electrons Journal-ref: Phys. Rev. Lett. 96, 030401 (2006) DOI: 10.1103/PhysRevLett.96.030401 \\ ( http://arXiv.org/abs/cond-mat/0509211 , 303kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0601314 replaced with revised version Tue, 24 Jan 2006 18:59:12 GMT (447kb) Title: Density profiles of an imbalance trapped Fermi gas near a Feshbach resonance Authors: Theja N. De Silva, Erich J. Mueller Comments: 4 pages, 5 Figures Subj-class: Other \\ ( http://arXiv.org/abs/cond-mat/0601314 , 447kb) ------------------------------------------------------------------------------ \\ Paper: quant-ph/0601163 Date: Tue, 24 Jan 2006 14:36:07 GMT (561kb) Title: Trapping atoms on a transparent permanent-magnet atom chip Authors: A. Shevchenko, M. Heilio, T. Lindvall, A. Jaakkola, I. Tittonen, M. Kaivola, T. Pfau Comments: 5 pages \\ We describe experiments on trapping of atoms in microscopic magneto-optical traps on an optically transparent permanent-magnet atom chip. The chip is made of magnetically hard ferrite-garnet material deposited on a dielectric substrate. The confining magnetic fields are produced by miniature magnetized patterns recorded in the film by magneto-optical techniques. We trap Rb atoms on these structures by applying three crossed pairs of counter-propagating laser beams in the conventional magneto-optical trapping (MOT) geometry. We demonstrate the flexibility of the concept in creation and in-situ modification of the trapping geometries through several experiments. \\ ( http://arXiv.org/abs/quant-ph/0601163 , 561kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0510214 replaced with revised version Tue, 24 Jan 2006 21:34:11 GMT (21kb) Title: Worm Algorithm for Continuous-space Path Integral Monte Carlo Simulations Authors: M. Boninsegni, N. Prokof'ev and B. Svistunov Comments: Accepted for publication in Phys. Rev. Lett Subj-class: Statistical Mechanics \\ ( http://arXiv.org/abs/cond-mat/0510214 , 21kb) ------------------------------------------------------------------------------ \\ Paper: quant-ph/0601170 Date: Wed, 25 Jan 2006 14:15:17 GMT (307kb) Title: Decomposing a pulsed optical parametric amplifier into independent squeezers Authors: A. I. Lvovsky, W. Wasilewski, and K. Banaszek Comments: 12 pages, 5 figures, REVTeX. Submitted to the proceedings of the Conference Quantum Optics VI, published as a Special Issue of Jounal of Modern Optics \\ We discuss the concept of characteristic squeezing modes applied to a travelling-wave optical parametric amplifier pumped by an ultrashort pulse. The characteristic modes undergo decoupled single-mode squeezing transformations, and therefore they form a useful basis to describe the evolution of the entire multimode system. This provides an elegant and intuitive picture of quantum statistical properties of parametric fluorescence. We analyse the efficiency of detecting quadrature squeezing, and present results of numerical calculations for a realistic nonlinear medium. \\ ( http://arXiv.org/abs/quant-ph/0601170 , 307kb) ------------------------------------------------------------------------------ \\ Paper: quant-ph/0601171 Date: Wed, 25 Jan 2006 16:12:40 GMT (149kb) Title: Transmittivity measurements by means of squeezed vacuum light Authors: V. D'Auria, C. de Lisio, A. Porzio, S. Solimeno, M. G. A. Paris Comments: 14 pages, 8 figures \\ A method for measuring the transmittivity of optical samples by using squeezed--vacuum radiation is illustrated. A squeezed vacuum field generated by a below--threshold optical parametric oscillator is propagated through a nondispersive medium and detected by a homodyne apparatus. The variance of the detected quadrature is used for measuring the transmittivity. With this method it is drastically reduced the number of photons passing through the sample during the measurement interval. The results of some tests are reported. \\ ( http://arXiv.org/abs/quant-ph/0601171 , 149kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0601604 Date: Thu, 26 Jan 2006 04:23:40 GMT (71kb) Title: Thermal fluctuations of vortex clusters in two-dimensional BEC Authors: W. V. Pogosov and K. Machida Comments: 8 pages, 2 figures Subj-class: Statistical Mechanics; Other \\ We study the thermal fluctuations of vortex positions in small vortex clusters in a harmonically trapped rotating BEC. It is shown that the order-disorder transition of two-shells clusters occurs via decoupling of shells with respect to each other due to strong fluctuations of the phase of the order parameter. The corresponding "melting" temperature depends strongly on the commensurability between numbers of vortices in shells. We derive scaling laws for average angle between shells in terms of number of particles in the system and temperature and calculate these angles for some particular values of the coupling constant and rotation speed. We show that "melting" can be achieved at experimentally attainable parameters. Also studied is the effect of thermal fluctuations on vortices in an anisotropic trap with small quadrupole deformation. We show that thermal fluctuations lead to the decoupling of a vortex cluster from the pinning potential induced by this deformation. The decoupling temperatures are calculated. It is demonstrated that pinning energy and average deviation angle of the vortex cluster from the equilibrium have different asymptotic behaviour for different vortex configurations, when the trap anisotropy tends to zero, revealing strong commensurability effects. \\ ( http://arXiv.org/abs/cond-mat/0601604 , 71kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0601605 Date: Thu, 26 Jan 2006 04:28:12 GMT (160kb) Title: Vortex nucleation in rotating BEC: the role of the boundary condition for the order parameter Authors: W. V. Pogosov and K. Machida Comments: 6 pages, 2 figures Subj-class: Statistical Mechanics; Other \\ We study the process of vortex nucleation in rotating two-dimensional BEC confined in a harmonic trap. We show that, within the Gross-Pitaevskii theory with the boundary condition of vanishing of the order parameter at infinity, topological defects nucleation occurs via the creation of vortex-antivortex pairs far from the cloud center, where the modulus of the order parameter is small. Then, vortices move towards the center of the cloud and antivortices move in the opposite direction but never disappear. We also discuss the role of surface modes in this process. \\ ( http://arXiv.org/abs/cond-mat/0601605 , 160kb) ------------------------------------------------------------------------------ \\ Paper: quant-ph/0601177 Date: Thu, 26 Jan 2006 16:42:42 GMT (19kb) Title: Entanglement generation via scattering of two particles with hard-core repulsion Authors: Frank Schm\"user and Dominik Janzing Comments: 2 figures \\ We analyse the entanglement generation in a one dimensional scattering process. The two colliding particles have a Gaussian wave function and interact by hard--core repulsion.In our analysis results on the entanglement of two mode Gaussian states are used. The produced entanglement depends in a non-obvious way on the parameters ratio of masses and initial widths. The asymptotic wavefunction of the two particles and its associated ellipse yield additional geometric insight into these conditions. The difference to the quantitative analysis of the amount of entanglement generated by beam splitters with squeezed light is discussed. \\ ( http://arXiv.org/abs/quant-ph/0601177 , 19kb) ------------------------------------------------------------------------------Received on Mon Jan 30 2006 - 14:05:44 EST

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