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

Date: Mon, 27 Feb 2006 10:12:49 +1000 (EST)

Date: Mon, 27 Feb 2006 10:12:49 +1000 (EST)

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

For archives of this mailing list see:

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Have a good week,

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 (*cross-listing*): nucl-th/0602050 Date: Thu, 16 Feb 2006 20:20:01 GMT (16kb) Title: Density functional theory for fermions close to the unitary regime Authors: Anirban Bhattacharyya and T. Papenbrock Comments: 4 pages, 2 figures Subj-class: Nuclear Theory; Strongly Correlated Electrons; Atomic Physics \\ We consider interacting Fermi systems close to the unitary regime and compute the corrections to the energy density that are due to a large scattering length and a small effective range. Our approach exploits the universality of the density functional and determines the corrections from the analyical results for the harmonically trapped two-body system. The corrections due to the finite scattering length compare well with the result of Monte Carlo simulations. We also apply our results to symmetric neutron matter. \\ ( http://arXiv.org/abs/nucl-th/0602050 , 16kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0507460 replaced with revised version Fri, 17 Feb 2006 16:21:36 GMT (323kb) Title: Stability of Bosonic atomic and molecular condensates near a Feshbach resonance Authors: Sourish Basu, Erich J. Mueller Comments: 4 pages, 2 figures Subj-class: Other \\ ( http://arXiv.org/abs/cond-mat/0507460 , 323kb) ------------------------------------------------------------------------------ \\ Paper: quant-ph/0602148 Date: Fri, 17 Feb 2006 11:06:03 GMT (29kb) Title: One-step generation of high-quality squeezed and EPR states in cavity QED Authors: C. J. Villas-Boas and M. H. Y. Moussa Journal-ref: The European Physical Journal D 32, 147 (2005) \\ We show how to generate bilinear (quadratic) Hamiltonians in cavity quantum electrodynamics (QED) through the interaction of a single driven three-level atom with two (one) cavity modes. With this scheme it is possible to generate one-mode mesoscopic squeezed superpositions, two-mode entanglements, and two-mode squeezed vacuum states (such the original EPR state), without the need for Ramsey zones and external parametric amplification. The degree of squeezing achieved is up to 99% with currently feasible experimental parameters and the errors due to dissipative mechanisms become practically negligible. \\ ( http://arXiv.org/abs/quant-ph/0602148 , 29kb) ------------------------------------------------------------------------------ \\ Paper: quant-ph/0602149 Date: Fri, 17 Feb 2006 14:58:18 GMT (25kb) Title: Damped quantum harmonic oscillator Authors: A. Isar, A. Sandulescu Comments: 36 pages, review article Journal-ref: Romanian J. Phys., Vol. 37, No. 7 (1992), p. 643 \\ In the framework of the Lindblad theory for open quantum systems the damping of the harmonic oscillator is studied. A generalization of the fundamental constraints on quantum mechanical diffusion coefficients which appear in the master equation for the damped quantum oscillator is presented; the Schr\"odinger and Heisenberg representations of the Lindblad equation are given explicitly. On the basis of these representations it is shown that various master equations for the damped quantum oscillator used in the literature are particular cases of the Lindblad equation and that the majority of these equations are not satisfying the constraints on quantum mechanical diffusion coefficients. Analytical expressions for the first two moments of coordinate and momentum are also obtained by using the characteristic function of the Lindblad master equation. The master equation is transformed into Fokker-Planck equations for quasiprobability distributions. A comparative study is made for the Glauber $P$ representation, the antinormal ordering $Q$ representation and the Wigner $W$ representation. It is proven that the variances for the damped harmonic oscillator found with these representations are the same. By solving the Fokker-Planck equations in the steady state, it is shown that the quasiprobability distributions are two-dimensional Gaussians with widths determined by the diffusion coefficients. The density matrix is represented via a generating function, which is obtained by solving a time-dependent linear partial differential equation derived from the master equation. Illustrative examples for specific initial conditions of the density matrix are provided. \\ ( http://arXiv.org/abs/quant-ph/0602149 , 25kb) ------------------------------------------------------------------------------ \\ Paper: quant-ph/0602150 Date: Fri, 17 Feb 2006 12:13:02 GMT (356kb) Title: Tomographic test of quantum nonlocality for a time-delocalized single photon Authors: Milena D'Angelo, Alessandro Zavatta, Valentina Parigi, and Marco Bellini Comments: 5 pages, 3 figures \\ We study the nonlocal nature of a temporally-delocalized single photon by performing the first tomographic test of Bell's inequality. Balanced homodyne detection is performed on two well-separated temporal modes carrying a single photon. The reconstructed two-mode Wigner function is employed to test Bell's inequality in the form theoretically proposed by Banaszek and Wodkiewicz [1]. A clear violation of the predictions of local hidden-variable theories is found, provided some auxiliary assumptions are made. Our experiment is a proof-of-principle demonstration of single-photon nonlocality, and indicates the meaningfulness of extending the concepts of entanglement and nonlocality to a coherently delocalized single photon. Furthermore, we show that the tomographic approach to Bell's inequality may open the way towards completely loophole-free tests of Bell's inequality. \\ ( http://arXiv.org/abs/quant-ph/0602150 , 356kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0602437 Date: Sat, 18 Feb 2006 08:01:00 GMT (186kb) Title: Phase diagrams of one-dimensional Bose-Fermi mixtures of ultra-cold atoms Authors: L. Mathey, D.-W. Wang Comments: 16 pages, 8 figures Subj-class: Other \\ We study the quantum phase diagrams of Bose-Fermi mixtures of ultracold atoms confined to one dimension in an optical lattice. For systems with incommensurate densities, various quantum phases, e.g. charge/spin density waves, pairing, phase separation, and the Wigner crystal, are found to be dominant in different parameter regimes within a bosonization approach. The structure of the phase diagram leads us to propose that the system is best understood as a Luttinger liquid of polarons (i.e. atoms of one species surrounded by screening clouds of the other species). Special fillings, half-filling for fermions and unit filling for bosons, and the resulting gapped phases are also discussed, as well as the properties of the polarons and the experimental realization of these phases. \\ ( http://arXiv.org/abs/cond-mat/0602437 , 186kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0510624 replaced with revised version Sat, 18 Feb 2006 16:44:02 GMT (496kb) Title: The role of interactions, tunneling and harmonic confinement on the adiabatic loading of bosons in an optical lattice Authors: Ana Maria Rey, Guido Pupillo, and J. V. Porto Comments: 9 pages and 6 figures Subj-class: Statistical Mechanics Journal-ref: Phys. Rev. A 73, 023608 (2006) \\ ( http://arXiv.org/abs/cond-mat/0510624 , 496kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0511512 replaced with revised version Mon, 20 Feb 2006 12:00:14 GMT (735kb) Title: Tkachenko modes and structural phase transitions of the vortex lattice of a two component Bose-Einstein condensate Authors: M. Keceli, M.O. Oktel Comments: 24 pages, 13 figures, typos corrected, references added, final version Subj-class: Other Journal-ref: Phys. Rev. A 73, 023611 (2006) DOI: 10.1103/PhysRevA.73.023611 \\ ( http://arXiv.org/abs/cond-mat/0511512 , 735kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0511641 replaced with revised version Mon, 20 Feb 2006 05:51:30 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: quant-ph/0602163 Date: Mon, 20 Feb 2006 15:44:45 GMT (156kb) Title: Towards a Landau-Zener formula for an interacting Bose-Einstein condensate Authors: D. Witthaut, E. M. Graefe, and H. J. Korsch Comments: RevTeX, 8 pages, 9 figures \\ We consider the Landau-Zener problem for a Bose-Einstein condensate in a linearly varying two-level system, for the full many-particle system as well and in the mean-field approximation. The many-particle problem can be solved approximately within an independent crossings approximation, which yields an explicit Landau-Zener formula. \\ ( http://arXiv.org/abs/quant-ph/0602163 , 156kb) ------------------------------------------------------------------------------ \\ Paper: physics/0602135 Date: Mon, 20 Feb 2006 18:36:28 GMT (152kb) Title: Narrow Line Photoassociation in an Optical Lattice Authors: T. Zelevinsky, M. M. Boyd, A. D. Ludlow, T. Ido, J. Ye, R. Ciurylo, P. Naidon, P. S. Julienne Comments: 4 pages, 4 figures Subj-class: Atomic Physics; Optics \\ With ultracold $^{88}$Sr in a 1D magic wavelength optical lattice, we performed narrow line photoassociation spectroscopy near the $^1$S$_0 - ^3$P$_1$ intercombination transition. Nine least-bound vibrational molecular levels associated with the long-range $0_u$ and $1_u$ potential energy surfaces were measured and identified. A simple theoretical model accurately describes the level positions and treats the effects of the lattice confinement on the line shapes. The measured resonance strengths show that optical tuning of the ground state scattering length should be possible without significant atom loss. \\ ( http://arXiv.org/abs/physics/0602135 , 152kb) ------------------------------------------------------------------------------ \\ Paper: physics/0512184 replaced with revised version Mon, 20 Feb 2006 09:04:47 GMT (132kb) Title: Coupled atomic-molecular condensates in a double-well potential: decaying molecular oscillations Authors: Hui Jing, Sihong Gu and Mingsheng Zhan Comments: 6 pages, 4 figures, submitted Subj-class: Atomic Physics \\ ( http://arXiv.org/abs/physics/0512184 , 132kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0602468 Date: Mon, 20 Feb 2006 22:35:46 GMT (444kb) Title: Three-body local correlation function in the Lieb-Liniger model: bosonization approach Authors: Vadim V. Cheianov, H. Smith, M. B. Zvonarev Comments: 40 pages, 2 figures Subj-class: Other \\ We develop a method for the calculation of vacuum expectation values of local operators in the Lieb-Liniger model. This method is based on a set of new identities obtained using integrability and effective theory (``bosonization'') description. We use this method to get an explicit expression for the three-body local correlation function, measured in a recent experiment [1]. \\ ( http://arXiv.org/abs/cond-mat/0602468 , 444kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0602475 Date: Tue, 21 Feb 2006 01:17:25 GMT (63kb) Title: Full counting statistics of interference experiments between interacting one dimensional Bose liquids Authors: Vladimir Gritsev, Ehud Altman, Eugene Demler, Anatoli Polkovnikov Comments: 5 pages, 4 figures Subj-class: Strongly Correlated Electrons; Mesoscopic Systems and Quantum Hall Effect \\ We analyze the full counting statistics of the amplitude of interference fringes for bosons released from two independent one dimensional condensates at zero temperature. We show that the distribution function of fringe amplitudes is related to the partition function for a quantum impurity in a one-dimensional Luttinger liquid and can be calculated explicitly using methods of conformal field theory. We point out interesting relations between these distribution functions and transfer matrices of conformal field theories. This establishes a connection between BEC interference experiments and a variety of statistical models ranging from stochastic growth models to two dimensional quantum gravity. \\ ( http://arXiv.org/abs/cond-mat/0602475 , 63kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0602483 Date: Tue, 21 Feb 2006 09:58:17 GMT (79kb) Title: Exact ground state properties of finite ultracold Bose gases in a hard-wall trap Authors: Yajiang Hao, Yunbo Zhang, J.-Q. Liang and Shu Chen Comments: 5 pages, 5 figures Subj-class: Strongly Correlated Electrons \\ We investigate the ground state of the system of $N$ bosons enclosed in a hard-wall trap interacting via a repulsive or attractive $\delta $ -function potential. Based on the Bethe ansatz method, the explicit wave function is derived and is decided by numerically solving the Bethe ansatz equations for the full physical regimes ($-\infty <c<+\infty $). The ground state density profiles for finite systems with both the repulsive and attractive interactions are obtained by evaluating the one body density matrix. \\ ( http://arXiv.org/abs/cond-mat/0602483 , 79kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0504612 replaced with revised version Tue, 21 Feb 2006 13:14:01 GMT (531kb) Title: Formation of a vortex lattice in a rotating BCS Fermi gas Authors: Giulia Tonini (INFN), F\'{e}lix Werner (LKB - Lhomond), Yvan Castin (LKB - Lhomond) Comments: 14 pages Proxy: ccsd ccsd-00004798 Subj-class: Other \\ ( http://arXiv.org/abs/cond-mat/0504612 , 531kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0602245 replaced with revised version Tue, 21 Feb 2006 03:42:45 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, minor corrections Subj-class: Other \\ ( http://arXiv.org/abs/cond-mat/0602245 , 65kb) ------------------------------------------------------------------------------ \\ Paper: quant-ph/0602170 Date: Tue, 21 Feb 2006 04:40:16 GMT (373kb) Title: Low-lying bifurcations in cavity quantum electrodynamics Authors: Michael A. Armen and Hideo Mabuchi Comments: 13 pages, 10 figures, submitted to PRA \\ The interplay of quantum fluctuations with nonlinear dynamics is a central topic in the study of open quantum systems, connected to fundamental issues (such as decoherence and the quantum-classical transition) and practical applications (such as coherent information processing and the development of mesoscopic sensors/amplifiers). With this context in mind, we here present a computational study of some elementary bifurcations that occur in a driven and damped cavity quantum electrodynamics (cavity QED) model at low intracavity photon number. In particular, we utilize the single-atom cavity QED Master Equation and associated Stochastic Schrodinger Equations to characterize the equilibrium distribution and dynamical behavior of the quantized intracavity optical field in parameter regimes near points in the semiclassical (mean-field, Maxwell-Bloch) bifurcation set. Our numerical results show that the semiclassical limit sets are qualitatively preserved in the quantum stationary states, although quantum fluctuations apparently induce phase diffusion within periodic orbits and stochastic transitions between attractors. We restrict our attention to an experimentally realistic parameter regime. \\ ( http://arXiv.org/abs/quant-ph/0602170 , 373kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0602504 Date: Tue, 21 Feb 2006 21:01:27 GMT (150kb) Title: Disorder-enhanced phase coherence in trapped bosons on optical lattices Authors: Pinaki Sengupta, Aditya Raghavan, Stephan Haas Comments: 4 pages, 4 figures Subj-class: Other \\ The consequences of disorder on interacting bosons trapped in optical lattices are investigated by quantum Monte Carlo simulations. At small to moderate strengths of potential disorder a unique effect is observed: if there is a Mott plateau at the center of the trap in the clean limit, phase coherence {\it increases} as a result of disorder. The localization effects due to correlation and disorder compete against each other, resulting in a partial delocalization of the particles in the Mott region, which in turn leads to increased phase coherence. In the absence of a Mott plateau, this effect is absent. A detailed analysis of the uniform system without a trap shows that the disordered states participate in a Bose glass phase. \\ ( http://arXiv.org/abs/cond-mat/0602504 , 150kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0602525 Date: Wed, 22 Feb 2006 20:12:11 GMT (429kb) Title: Superfluid phases of the three-species fermion gas Authors: Paulo F. Bedaque, Jos\'e P. D'Incao Comments: 4 pages, 1 figure Subj-class: Other \\ We discuss the zero temperature phase diagram of a dilute gas with three fermionic species. We make use of solvable limits to conjecture the behavior of the system in the ``unitary'' regions. The physics of the Thomas-Efimov effect plays a role in these considerations. We find a rich phase diagram with superfluid, gapless superfluid and inhomogeneous phases with different symmetry breaking patterns. We then discuss one particular possible experimental implementation in a system of ^6Li atoms and the possible phases arising in this system as an external magnetic field is varied across three overlaping Feshbach resonances. We also suggest how to experimentally distinguish the different phases. \\ ( http://arXiv.org/abs/cond-mat/0602525 , 429kb) ------------------------------------------------------------------------------ \\ Paper: quant-ph/0602180 Date: Wed, 22 Feb 2006 13:41:06 GMT (12kb) Title: Single phonon detection scheme in dilute Bose-Einstein condensates Authors: Ralf Sch\"utzhold Comments: 4 pages \\ Based on doubly detuned Raman transitions between (meta) stable hyperfine states and recently developed atom counting techniques, a detection scheme for sound waves in dilute Bose-Einstein condensates with an accuracy down to the single-phonon level is proposed. This scheme would open up a new range of applications including the experimental observation of quantum radiation phenomena such as the Hawking effect in sonic black-hole analogues. PACS: 03.75.Kk, 04.70.Dy, 42.65.Dr. \\ ( http://arXiv.org/abs/quant-ph/0602180 , 12kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0602549 Date: Thu, 23 Feb 2006 12:54:47 GMT (28kb) Title: The four-boson scale near a Feshbach resonance Authors: M. T. Yamashita, Lauro Tomio, A. Delfino and T. Frederico Comments: 4 pages, 1 figure Subj-class: Soft Condensed Matter \\ We show that an independent four-body momentum scale $\mu_{(4)}$ drives the tetramer binding energy for fixed trimer energy (or three-body scale $\mu_{(3)}$) and large scattering length ($a$). The three- and four-body forces from the one-channel reduction of the atomic interaction near a Feshbach resonance disentangle $\mu_{(4)}$ and $\mu_{(3)}$. The four-body independent scale is also manifested through a family of Tjon-lines, with slope given by $\mu_{(4)}/\mu_{(3)}$ for $a^{-1}=0$. A new renormalization group limit cycle is expected to appear due to the new scale. \\ ( http://arXiv.org/abs/cond-mat/0602549 , 28kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0602568 Date: Thu, 23 Feb 2006 20:34:17 GMT (291kb) Title: Homogeneous Fermion Superfluid with Unequal Spin Populations Authors: Tin-Lun Ho and Hui Zhai Comments: 4 pages, 3 figures Subj-class: Superconductivity \\ For decades, the conventional view is that an s-wave BCS superfluid can not support uniform spin polarization due to a gap $\Delta$ in the quasiparticle excitation spectrum. We show that this is an artifact of the dismissal of quasiparticle interactions $V_{qp}^{}$ in the conventional approach at the outset. Such interactions can cause triplet fluctuations in the ground state and hence non-zero spin polarization at "magnetic field" $h<\Delta$. The resulting ground state is a pairing state of quasiparticles on the ``BCS vacuum". For sufficiently large $V_{qp}$, the spin polarization of at unitarity has the simple form $m\propto \mu^{1/2}$. Our study is motivated by the recent experiments at Rice which found evidence of a homogenous superfluid state with uniform spin polarization. \\ ( http://arXiv.org/abs/cond-mat/0602568 , 291kb) ------------------------------------------------------------------------------ \\ Paper: cond-mat/0601650 replaced with revised version Thu, 23 Feb 2006 16:08:23 GMT (34kb) Title: Dynamics of the Bose-Hubbard model: transition from Mott insulator to superfluid Authors: Fernando M. Cucchietti, Bogdan Damski, Jacek Dziarmaga, and Wojciech H. Zurek Comments: 4 pages & 3 figures, some improvements in presentation with respect to former version Report-no: LAUR-06-0477 Subj-class: Other \\ ( http://arXiv.org/abs/cond-mat/0601650 , 34kb) ------------------------------------------------------------------------------Received on Mon Feb 27 2006 - 10:12:49 EST

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