Photonic crystals of coated metallic spheresIt is shown that simple face-centered-cubic (fcc) structures of both metallic and coated metallic spheres are ideal candidates to achieve a tunable complete photonic bandgap (CPBG) for optical…Alexander Moroz·Mar 31, 2000SaveLearn
Kinetic Theory of Collective Excitations and Damping in Bose-Einstein Condensed GasesWe calculate the frequencies and damping rates of the low-lying collective modes of a Bose-Einstein condensed gas at nonzero temperature. We use a complex nonlinear Schrödinger equation to determine…U. Al Khawaja, H. T. C. Stoof·Mar 31, 2000SaveLearn
Cyclotron motion of a quantized vortex in a superfluidIn two dimensions a microscopic theory providing a basis for the naive analogy between a quantized vortex in a superfluid and an electron in a uniform magnetic field is presented. Following the…Jian-Ming Tang·Mar 30, 2000SaveLearn
Analysis of Dislocation Mechanism for Melting of ElementsThe melting of elemental solids is modelled as a dislocation-mediated transition on a lattice. Statistical mechanics of linear defects is used to obtain a new relation between melting temperature,…Leonid Burakovsky, Dean L. Preston·Mar 30, 2000SaveLearn
Crowd-anticrowd model of the Minority GameWe provide a theoretical description of the Minority Game in terms of crowd effects. The size of the fluctuations arising in the game is controlled by the interplay between crowds of like-minded…M. Hart, P. Jefferies, N. F. Johnson et al.·Mar 30, 2000SaveLearn
Damping of condensate collective modes due to equilibration with the non-condensateWe consider the damping of condensate collective modes at finite temperatures arising from lack of equilibrium between the condensate and the non-condensate atoms, an effect that is ignored in the…J. E. Williams, A. Griffin·Mar 29, 2000SaveLearn
Dynamical models for sand ripples beneath surface wavesWe introduce order parameter models for describing the dynamics of sand ripple patterns under oscillatory flow. A crucial ingredient of these models is the mass transport between adjacent ripples,…Ken Haste Andersen, Marie-Line Chabanol, Martin van Hecke·Mar 29, 2000SaveLearn
Role of Fermi-level pinning in nanotube Schottky diodesAt semiconductor-metal junctions, the Schottky barrier height is generally fixed by "Fermi-level pinning". We find that when a semiconducting carbon nanotube is end-contacted to a metal (the…Francois Leonard, J. Tersoff·Mar 28, 2000SaveLearn
A conformal field theory description of the paired and parafermionic states in the quantum Hall effectWe extend the construction of the effective conformal field theory for the Jain hierarchical fillings proposed in cond-mat/9912287 to the description of a quantum Hall fluid at non standard fillings…G. Cristofano, G. Maiella, V. Marotta·Mar 28, 2000SaveLearn
Electronic Properties of Ultra-Thin Aluminum NanowiresWe have carried out first principles electronic structure and total energy calculations for a series of ultrathin aluminum nanowires, based on structures obtained by relaxing the model wires of…F. Di Tolla, A. Dal Corso, J. A. Torres et al.·Mar 28, 2000SaveLearn
How to create Alice string (half-quantum vortex) in a vector Bose-Einstein condensateWe suggest a procedure how to prepare the vortex with N=1/2 winding number -- the counterpart of the Alice string -- in a Bose--Einstein condensate with hyperfine spin F=1. Other possible vortices in…U. Leonhardt, G. E. Volovik·Mar 27, 2000SaveLearn
Exact solution of Calogero model with competing long-range interactionsAn integrable extension of the Calogero model is proposed to study the competing effect of momentum dependent long-range interaction over the original 1 r2 interaction. The eigenvalue…B. Basu-Mallick, Anjan Kundu·Mar 27, 2000SaveLearn
Complex Entropic Forms for Gradient Pattern Analysis of Spatio-temporal DynamicsIn this paper we describe two new computational operators, called complex entropic form (CEF) and generalized complex entropic form (GEF), for pattern characterization of spatially extended systems.…Fernando M. Ramos, Reinaldo R. Rosa, Camilo Rodrigues Neto et al.·Mar 25, 2000SaveLearn
Collective oscillations of two colliding Bose-Einstein condensatesTwo 87Rb condensates (F=2, mf=2 and mf=1) are produced in highly displaced harmonic traps and the collective dynamical behaviour is investigated. The mutual interaction between the two condensates…P. Maddaloni, M. Modugno, C. Fort et al.·Mar 24, 2000SaveLearn
Magnetic Behavior of a Mixed Ising Ferrimagnetic Model in an Oscillating Magnetic FieldThe magnetic behavior of a mixed Ising ferrimagnetic system on a square lattice, in which the two interpenetrating square sublattices have spins +- 1/2 and spins +-1,0, in the presence of an…G. M. Buendia, E. Machado·Mar 24, 2000SaveLearn
Model of Hydrophobic Attraction in Two and Three DimensionsAn earlier one-dimensional lattice model of hydrophobic attraction is extended to two and three dimensions and studied by Monte Carlo simulation. The solvent-mediated contribution to the potential of…G. T. Barkema, B. Widom·Mar 24, 2000SaveLearn
Theory of the evolutionary minority gameWe present a theory which describes a recently introduced model of an evolving, adaptive system in which agents compete to be in the minority. The agents themselves are able to evolve their…T. S. Lo, P. M. Hui, N. F. Johnson·Mar 23, 2000SaveLearn
Decrumpling membranes by quantum effectsThe phase diagram of an incompressible fluid membrane subject to quantum and thermal fluctuations is calculated exactly in a large number of dimensions of configuration space. At zero temperature, a…M. E. S. Borelli, H. Kleinert·Mar 22, 2000SaveLearn
Calculation of Second Topological Moment <m2> of Two Entangled PolymersWe set up a Chern-Simons theory for the entanglement of two polymers P1 and P2, and calculate the second topological moment <m2>, where m is the linking number. The result applies approximately to…F. Ferrari, H. Kleinert, I. Lazzizzera·Mar 22, 2000SaveLearn
Collective Modes in Strongly Coupled Elecronic Bilayer LiquidsWe present the first reliable calculation of the collective mode structure of a strongly coupled electronic bilayer. The calculation is based on a classical model through the 3rd…G. Kalman, V. Valtchinov, K. I. Golden·Mar 21, 2000SaveLearn
Breakdown of universality in multi-cut matrix modelsWe solve the puzzle of the disagreement between orthogonal polynomials methods and mean field calculations for random NxN matrices with a disconnected eigenvalue support. We show that the difference…Gabrielle Bonnet, Francois David, Bertrand Eynard·Mar 20, 2000SaveLearn
Critical light scattering in liquidsWe compare theoretical results for the characteristic frequency of the Rayleigh peak calculated in one-loop order within the field theoretical method of the renormalization group theory with…G. Flossmann, R. Folk·Mar 20, 2000SaveLearn
Multifractal behavior of linear polymers in disordered mediaThe scaling behavior of linear polymers in disordered media modelled by self-avoiding random walks (SAWs) on the backbone of two- and three-dimensional percolation clusters at their critical…A. Ordemann, M. Porto, H. E. Roman et al.·Mar 20, 2000SaveLearn
Swelling-collapse transition of self-attracting walksWe study the structural properties of self-attracting walks in d dimensions using scaling arguments and Monte Carlo simulations. We find evidence for a transition analogous to the Θtransition of…A. Ordemann, G. Berkolaiko, S. Havlin et al.·Mar 20, 2000SaveLearn
Dynamic Scaling for First-order Phase TranstionsThe critical behaviour in short time dynamics for the q=6 and 7 state Potts models in two-dimensions is investigated. It is shown that dynamic finite-size scaling exists for first-order phase…Banu Ebru Özoğuz, Yiğit Gündüç, Meral Aydın·Mar 20, 2000SaveLearn