Potts model: Duality, Uniformization and the Seiberg-Witten modulusThe introduction of a modulus z(K), analogous to u=<tr phi2> in the N=2 SUSY SU(2) gauge theory solved by Seiberg and Witten, and whose defining property is the invariance under the symmetry and…Gaetano Bertoldi·Dec 14, 1999SaveLearn
Effect of Time Reversal Symmetry Breaking on the Density of States in Small Superconducting GrainsWe show that in ultra-small superconducting grains any concentration of magnetic impurities or infinitely small orbital effect of magnetic field leads to destruction of the hard gap in the tunneling…I. S. Beloborodov, B. N. Narozhny, I. L. Aleiner·Dec 13, 1999SaveLearn
Comment on ``Friedel phases and phases of transmission amplitudes in quantum scattering systems" by T. Taniguchi and M. BuettikerWe take a modified boundary condition at the dead end of a stub to simulate transmission zeroes being replaced by minima and then the discontinuous phase slip (or decrease) at the transmission zeroes…P. Singha Deo·Dec 13, 1999SaveLearn
Re-examination of electronic transports through a quantum wire coupled to a quantum dotIn this paper we re-examine the problem of electronic transports through a system consisting of a quantum dot which has well-defined discrete energy levels connected to an infinite quantum wire,…Yu-Liang Liu, T. K. Ng·Dec 11, 1999SaveLearn
Probing the statistical properties of Bose-Einstein condensates with lightA scattering of short, weak, nonresonant laser pulses on a Bose-Einstein condensate is proposed as a tool for studying its statistical properties. We show in particular that the variance of the…Z. Idziaszek, K. Rzazewski, M. Lewenstein·Dec 10, 1999SaveLearn
Delocalization of states in two component superlattices with correlated disorderElectron and phonon states in two different models of intentionally disordered superlattices are studied analytically as well as numerically. The localization length is calculated exactly and we…T. Hakobyan, D. Sedrakyan, A. Sedrakyan et al.·Dec 10, 1999SaveLearn
Diffusion Monte Carlo study of circular quantum dotsWe present ground and excited state energies obtained from Diffusion Monte Carlo (DMC) calculations, using accurate multiconfiguration wave functions, for N electrons (N13) confined to a…F. Pederiva, C. J. Umrigar, E. Lipparini·Dec 9, 1999SaveLearn
Theory of solitons, polarons and multipolarons in one dimension: An alternative formulationWe develop an alternative formulation of the theory of solitons, polarons and multipolarons in quasi-one-dimensional degenerate and non-degenerate conducting polymers, starting from the continuum…Kihong Kim, Dong-Hun Lee·Dec 9, 1999SaveLearn
Impurity scattering in metallic carbon nanotubes with superconducting pair potentialsEffects of the superconducting pair potential on the impurity scattering processes in metallic carbon nanotubes are studied theoretically. The backward scattering of electrons vanishes in the normal…Kikuo Harigaya·Dec 8, 1999SaveLearn
Study of Pairing Correlations in the Attractive Hubbard Model on Chains, Ladders, and SquaresWe report the results of zero temperature quantum Monte Carlo simulations and zero temperature mean-field calculations of the attractive Hubbard model on chains, ladders, and square lattices. We…M. Guerrero, G. Ortiz, J. E. Gubernatis·Dec 7, 1999SaveLearn
Anomalous Quantum Diffusion and Conductivity of QuasicrystalsA phenomenological diffusion law L(t) tβ, where L(t) measures the spreading of a wave-packet in a time t, is assumed for perfect quasicrystals. We show that it affects their conductivity…Didier Mayou·Dec 7, 1999SaveLearn
Dynamic structure factor and momentum distribution of a trapped Bose gasThe dynamic structure factor of a trapped Bose-Einstein condensed gas is investigated at zero temperature in the framework of Bogoliubov theory. Different values of momentum transfer are considered,…F. Zambelli, L. P. Pitaevskii, D. M. Stamper-Kurn et al.·Dec 6, 1999SaveLearn
Coherent spin dynamics in diluted-magnetic quantum wellsSpins of charge carriers, paramagnetic centers, and nuclei in semiconductor structures are known to be oriented if circular-polarized light is shined upon the structure. This is due to transfer of…Kirill Kavokin·Dec 6, 1999SaveLearn
Towards a Field Theory of the Plateau TransitionWe suggest a procedure for calculating correlation functions of the local densities of states (DOS) at the plateau transitions in the Integer Quantum Hall effect (IQHE). We argue that their…M. J. Bhaseen, I. I. Kogan, O. A. Soloviev et al.·Dec 3, 1999SaveLearn
RF coupling of a Bose-Einstein condensate in a TOP trapA radio frequency (RF) transition is used to convert a pure F=2,mF=2 87Rb Bose-Einstein condensate confined in a TOP trap to a mixture of F=2,mF=2 and F=2,mF=1 states. We show that the nature of this…J. L. Martin, C. R. McKenzie, N. R. Thomas et al.·Dec 3, 1999SaveLearn
Distribution of repetitions of ancestors in genealogical treesWe calculate the probability distribution of repetitions of ancestors in a genealogical tree for simple neutral models of a closed population with sexual reproduction and non-overlapping generations.…B. Derrida, S. C. Manrubia, D. H. Zanette·Dec 3, 1999SaveLearn
Very long transients in globally coupled mapsVery long transients are found in the partially ordered phase of type II of globally coupled logistic maps. The transients always lead the system in this phase to a state with a few synchronous…S. C. Manrubia, A. S. Mikhailov·Dec 3, 1999SaveLearn
Smectic-Nematic Phase Transition as Wrinkling Transition in a Stack of MembranesWe point out that the smectic-nematic phase transition may considered as a transition of a stack of membranes in 2+ε dimensions, in which the layers become so wrinkled that they interpenetrate each…H. Kleinert·Dec 2, 1999SaveLearn
Dynamical Properties of Chiral-Glass Order in Ceramic High-Tc SuperconductorsThere recently accumulated growing numerical and experimental evidence that a novel glassy zero-field phase characterized by the spontaneously broken time-reversal symmetry, a chiral-glass phase, is…Hikaru Kawamura·Dec 2, 1999SaveLearn
Magnetic ordering in GaAlAs:Mn double well structureThe magnetic order in the diluted magnetic semiconductor barrier of double AlAs/GaAs: Mn quantum well structures is investigated by Monte Carlo simulations. A confinement adapted RKKY mechanism is…M. A. Boselli, I. C. da Cunha Lima, A. Ghazali·Dec 1, 1999SaveLearn
Impurity relaxation mechanism for dynamic magnetization reversal in a single domain grainThe interaction of coherent magnetization rotation with a system of two-level impurities is studied. Two different, but not contradictory mechanisms, the `slow-relaxing ion' and the…Vladimir L. Safonov, H. Neal Bertram·Dec 1, 1999SaveLearn
Monopoles and fractional vortices in chiral superconductorsWe discuss two exotic objects, which must be experimentally identified in chiral superfluids and superconductors. These are (i) the vortex with fractional quantum number (N=1/2 in chiral superfluids,…G. E. Volovik·Nov 30, 1999SaveLearn
Diffusional growth of wetting dropletsThe diffusional growth of wetting droplets on the boundary wall of a semi-infinite system is considered in different regions of a first-order wetting phase diagram. In a quasistationary approximation…R. Burghaus·Nov 30, 1999SaveLearn
Super lattice formation of an array of volatile wetting dropletsFor an ordered array of critical volatile wetting droplets the formation of a super lattice by an Ostwald-ripening like competition process is considered. The underlying diffusion problem is treated…R. Burghaus·Nov 29, 1999SaveLearn
Thermal behavior of Quantum Cellular Automaton wiresWe investigate the effect of a finite temperature on the behavior of logic circuits based on the principle of Quantum Cellular Automata (QCA) and of ground state computation. In particular, we focus…C. Ungarelli, S. Francaviglia, M. Macucci et al.·Nov 29, 1999SaveLearn