Models for the integer quantum Hall effect: the network model, the Dirac equation, and a tight-binding HamiltonianWe consider models for the plateau transition in the integer quantum Hall effect. Starting from the network model, we construct a mapping to the Dirac Hamiltonian in two dimensions. In the general…C. -M. Ho, J. T. Chalker·May 12, 1996SaveLearn
Rapid Suppression of the Spin Gap in Zn-doped CuGeO3 and SrCu2O3The influence of non-magnetic impurities on the spectrum and dynamical spin structure factor of a model for CuGeO3 is studied. A simple extension to Zn-doped Sr Cu2 O3 is also discussed.…George Martins, Elbio Dagotto, José Riera·May 11, 1996SaveLearn
Airline Crew Scheduling with Potts NeuronsA Potts feedback neural network approach for finding good solutions to resource allocation problems with a non-fixed topology is presented. As a target application the airline crew scheduling problem…M. Lagerholm, C. Peterson, B. Söderberg·May 11, 1996SaveLearn
The end of c=1 CFTConformal field theory (CFT) with the central charge c=1 is important both in the field theory and in the condensed matter physics, since it has the continuous internal symmetry (U(1) or SU(2)) and a…Kiyohide Nomura·May 11, 1996SaveLearn
Plasma resonance and remaining Josephson coupling in the ``decoupled vortex liquid phase'' in layered superconductorsWe relate the frequency of the plasma resonance in layered superconductors with the frequency dependent superconducting response along the c-direction. We demonstrate that the sharp resonance can…A. E. Koshelev·May 10, 1996SaveLearn
A Monte Carlo Study of Correlations in Quantum Spin LaddersWe study antiferromagnetic spin--1/2 Heisenberg ladders, comprised of nc chains (2 ≤ nc ≤ 6) with ratio J/J\| of inter-- to intra--chain couplings. From measurements of the…M. Greven, R. J. Birgeneau, U. -J. Wiese·May 10, 1996SaveLearn
Some distribution functions of the Laguerre ensembleIn this paper we revisit the smallest-eigenvalue distribution of the Laguerre ensembles by presenting in closed form certain integrals obtained previously. With this information we compute, using…Y Chen, S M Manning·May 10, 1996SaveLearn
Cohesive energies of cubic III-V semiconductorsCohesive energies for twelve cubic III-V semiconductors with zincblende structure have been determined using an ab-initio scheme. Correlation contributions, in particular, have been evaluated using…Beate Paulus, Peter Fulde, Hermann Stoll·May 10, 1996SaveLearn
Enhancement of the Kondo temperature of magnetic impurities in metallic point contacts due to the fluctuations of the local density of statesThe effect of local density of states (LDOS) fluctuations on the dynamics of a Kondo impurities in a small metallic point contact (PC) is studied. To estimate the spatial and energy dependent LDOS…G. Zarand L. Udvardi·May 10, 1996SaveLearn
Critical dynamics and multifractal exponents at the Anderson transition in 3d disordered systemsWe investigate the dynamics of electrons in the vicinity of the Anderson transition in d=3 dimensions. Using the exact eigenstates from a numerical diagonalization, a number of quantities related…Tobias Brandes, Bodo Huckestein, Ludwig Schweitzer·May 10, 1996SaveLearn
Eliashberg-type equations for correlated superconductorsThe derivation of the Eliashberg -- type equations for a superconductor with strong correlations and electron--phonon interaction has been presented. The proper account of short range Coulomb…Karol I. Wysokinski·May 9, 1996SaveLearn
Spontaneous coherence and the quantum Hall Effect in triple-layer electron systemsWe investigate spontaneous interlayer phase coherence and the occurrence of the quantum Hall effect in triple-layer electron systems. Our work is based on a simple tight-binding model that greatly…C. B. Hanna, A. H. MacDonald·May 9, 1996SaveLearn
Possibility of Geometric Description of Quasiparticles in SolidsNew phenomenological approach for the description of elementary collective excitations is proposed. The crystal is considered to be an anisotropic space-time vacuum with a prescribed metric tensor in…Yu. A. Danilov, A. V. Rozhkov, V. L. Safonov·May 9, 1996SaveLearn
Weak first-order transition in the quasi-one-dimensional frustrated XY antiferromagnetThe results of finite-size scaling analysis of histogram Monte-Carlo simulations on the stacked triangular XY antiferromagnet with anisotropic near-neighbor exchange interactions are presented. With…M. L. Plumer, A. Mailhot·May 9, 1996SaveLearn
Momentum Distribution for Bosons with Positive Scattering Length in a TrapThe coordinate-momentum double distribution function ρ( r, p) d3rd3p is calculated in the local density approximation for bosons with positive scattering length a in a trap. The…T. T. Chou, Chen Ning Yang, L. H. Yu·May 9, 1996SaveLearn
Two dimensional Ising spin glasses with non-zero ordering temperaturesWe demonstrate numerically that for Ising spins on square lattices with ferromagnetic second neighbour interactions and random near neighbour interactions, two dimensional Ising spin glass order with…N. Lemke, I. A. Campbell·May 9, 1996SaveLearn
Two-magnon Raman scattering in a spin density wave antiferromagnetWe present the results for a model calculation of resonant two-magnon Raman scattering in a spin density wave (SDW) antiferromagnet. The resonant enhancement of the two-magnon intensity is obtained…Friedhelm Schoenfeld, Arno P. Kampf, Erwin Mueller-Hartmann·May 9, 1996SaveLearn
Exhaustive search for low autocorrelation binary sequencesBinary sequences with low autocorrelations are important in communication engineering and in statistical mechanics as groundstates of the Bernasconi-model. Computer searches are the main tool to…S. Mertens·May 8, 1996SaveLearn
Gap formation probability of a one-dimensional gas modelWe investigate the gap formation probability of the effective one dimensional gas model proposed the energy level statistics for disordered solids.Y Chen, S M Manning·May 8, 1996SaveLearn
Critical Exponents of the Metal-Insulator Transition in the Two-Dimensional Hubbard ModelWe study the filling-controlled metal-insulator transition in the two-dimensional Hubbard model near half-filling with the use of zero temperature quantum Monte Carlo methods. In the metallic phase,…Nobuo Furukawa, Fakher F. Assaad, Masatoshi Imada·May 8, 1996SaveLearn
Phonon Emission from a 2D Electron Gas: Evidence of Transition to the Hydrodynamic RegimeUsing as a thermometer the temperature dependent magneto-transport of a two-dimensional electron gas, we find that effective temperature scales with current as T e Ia, where $a=0.4 …Edmond Chow, H. P. Wei, S. M. Girvin et al.·May 8, 1996SaveLearn
Many skyrmion wave functions and skyrmion statistics in quantum Hall ferromagnetsWe determine the charge and statistical angle of skyrmions in quantum Hall ferromagnets by performing Berry phase calculations based on the microscopic variational wave functions for many-skyrmion…Kun Yang, S. L. Sondhi·May 8, 1996SaveLearn
Vortex Dynamics and Defects in Simulated Flux FlowWe present the results of molecular dynamic simulations of a two-dimensional vortex array driven by a uniform current through random pinning centers at zero temperature. We identify two types of flow…M. C. Faleski, M. C. Marchetti, A. A. Middleton·May 8, 1996SaveLearn
Current-dependent exchange-correlation potential for dynamical linear response theoryThe frequency-dependent exchange-correlation potential, which appears in the usual Kohn-Sham formulation of a time-dependent linear response problem, is a strongly nonlocal functional of the density,…G. Vignale, Walter Kohn·May 8, 1996SaveLearn
Magnetoresistance and Hall Constant of Composite FermionsWe consider both disorder and interaction effects on the magnetoresistance and Hall constant of composite fermions in the vicinity of half filled Landau level. By contrast to the standard case of…D. V. Khveshchenko·May 8, 1996SaveLearn