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Condensed Matter papers — page 268

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Macroscopic Quantum Tunneling of a Fluxon in a Long Josephson Junction
Macroscopic quantum tunneling (MQT) for a single fluxon moving along a long Josephson junction is studied theoretically. To introduce a fluxon-pinning force, we consider inhomogeneities made by…
Takeo Kato, Masatoshi ImadaApr 26, 1996
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Transition from localized to extended eigenstates in the ensemble of power-law random banded matrices
We study statistical properties of the ensemble of large N× N random matrices whose entries Hij decrease in a power-law fashion Hij|i-j|-α. Mapping the problem onto a…
Alexander D. Mirlin, Yan V. Fyodorov, Frank-Michael Dittes et al.Apr 26, 1996
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Relaxation of frustration and gap enhancement by the lattice distortion in the Δ chain
We clarify an instability of the ground state of the Δ chain against the lattice distortion that increases a strength (λ) of a bond in each triangle. It relaxes the frustration and causes a…
Tota Nakamura, Satoshi TakadaApr 26, 1996
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Coherent patterns and self-induced diffraction of electrons on a thin nonlinear layer
Electron scattering on a thin layer where the potential depends self-consistently on the wave function has been studied. When the amplitude of the incident wave exceeds a certain threshold, a…
O. M. Bulashenko, V. A. Kochelap, L. L. BonillaApr 25, 1996
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SO(3) nonlinear σ model for a doped quantum helimagnet
A field theory describing the low-energy, long-wavelength sector of an incommensurate, spiral magnetic phase is derived from a spin-fermion model that is commonly used as a microscopic model for…
Susanne Klee, Alejandro MuramatsuApr 25, 1996
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The Ising-Kondo lattice with transverse field: an f-moment Hamiltonian for URu2Si2?
We study the phase diagram of the Ising-Kondo lattice with transverse magnetic field as a possible model for the weak-moment heavy-fermion compound URu2Si2, in terms of two low-lying f singlets in…
A. E. Sikkema, W. J. L. Buyers, I. Affleck et al.Apr 25, 1996
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Survival Probability of a Gaussian Non-Markovian Process: Application to the T=0 Dynamics of the Ising Model
We study the decay of the probability for a non-Markovian stationary Gaussian walker not to cross the origin up to time t. This result is then used to evaluate the fraction of spins that do not…
Satya N. Majumdar, Clément SireApr 24, 1996
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A Numerical Renormalization Group Study of a Kondo Hole in a One Dimensional Kondo Insulator
We have studied a Kondo hole in a one-dimensional Kondo insulator at half-filling using a density matrix formulation of the numerical renormalization group. The Kondo hole introduces midgap states.…
Clare C. YuApr 24, 1996
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Electrons, pseudoparticles, and quasiparticles in the one-dimensional many-electron problem
We generalize the concept of quasiparticle for one-dimensional (1D) interacting electronic systems. The and quasiparticles recombine the pseudoparticle colors c and s…
J. M. P. Carmelo, A. H. Castro NetoApr 24, 1996
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Topological ground-state excitations and symmetry in the many-electron one-dimensional problem
We consider the Hubbard chain in a magnetic field and chemical potential. We introduce a pseudohole basis where all states are generated from a single reference vacuum. This allows the evaluation for…
J. M. P. Carmelo, N. M. R. PeresApr 24, 1996
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Magneto-optical evidence of the percolation nature of the metal-insulator transition in the 2D electron system
We compare the results of the transport and time-resolved magneto-luminescence measurements in disordered 2D electron systems in GaAs-AlGaAs heterostructures in the extreme quantum limit, in…
I. V. Kukushkin, Vladimir I. Fal'ko, R. J. Haug et al.Apr 24, 1996
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Critical Behavior of the Flux-line Tension in Extreme Type-II Superconductors
The entropic corrections to the flux-line energy of extreme type-II superconductors are computed using a schematic dual Villain model description of the flux quanta. We find that the temperature…
J. P. RodriguezApr 24, 1996
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Monte Carlo study of the growth of L12 ordered domains in fcc A3B binary alloys
A Monte Carlo study of the late time growth of L12 ordered domains on a fcc A3B binary alloy is presented. The energy of the alloy has been modeled by a nearest neighbor interaction Ising…
Carlos Frontera, Eduard Vives, Teresa Castán et al.Apr 24, 1996
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Long-range correlations in the wave functions of chaotic systems
We study correlations of the amplitudes of wave functions of a chaotic system at large distances. For this purpose, a joint distribution function of the amplitudes at two distant points in a sample…
Vladimir I. Fal'ko, K. B. EfetovApr 24, 1996
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Critical Dynamics of the Contact Process with Quenched Disorder
We study critical spreading dynamics in the two-dimensional contact process (CP) with quenched disorder in the form of random dilution. In the pure model, spreading from a single particle at the…
Adriana G. Moreira, Ronald DickmanApr 24, 1996
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Dynamics of coupled quantum spin chains
Static and dynamical properties of weakly coupled antiferromagnetic spin chains are treated using a mean--field approximation for the interchain coupling and exact results for the resulting effective…
H. J. SchulzApr 23, 1996
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Is Heteropolymer Freezing Well Described by the Random Energy Model?
It is widely held that the Random Energy Model (REM) describes the freezing transition of a variety of types of heteropolymers. We demonstrate that the hallmark property of REM, statistical…
Vijay S. Pande, Alexander Yu. Grosberg, Chris Joerg et al.Apr 23, 1996
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Dephasing time of composite fermions
We study the dephasing of fermions interacting with a fluctuating transverse gauge field. The divergence of the imaginary part of the fermion self energy at finite temperatures is shown to result…
Patrick A. Lee, Eduardo R. Mucciolo, Henrik SmithApr 23, 1996
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Two-dimensional S=1/2 antiferromagnet on a plaquette lattice
We consider a simplified model of the magnetic structure of the two-dimensional compound CaV4O9 in terms of interacting square plaquettes of spins with two distinct antiferromagnetic exchange…
S. V. Meshkov, D. FoersterApr 23, 1996
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Exact solution and spectral flow for twisted Haldane-Shastry model
The exact solution of the spin chain model with 1/r2 exchange is found for twisted boundary conditions. The spectrum thus obtained can be reproduced by the asymptotic Bethe ansatz. The spectral…
T. Fukui, N. KawakamiApr 23, 1996
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Correlations of Eigenfunctions in Disordered Systems
Correlations of eigenfunctions, |ψk(r1)|2|ψl(r2)|2, in a disordered system are investigated. We derive general formulae expressing these correlation functions in terms of the…
Ya. M. Blanter, A. D. MirlinApr 22, 1996
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Spin-Peierls states of quantum antiferromagnets on the Ca V4 O9 lattice
We discuss the quantum paramagnetic phases of Heisenberg antiferromagnets on the 1/5-depleted square lattice found in Ca V4 O9. The possible phases of the quantum dimer model on this lattice are…
Subir Sachdev, N. ReadApr 22, 1996
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Coherent State path-integral simulation of many particle systems
The coherent state path integral formulation of certain many particle systems allows for their non perturbative study by the techniques of lattice field theory. In this paper we exploit this strategy…
M. Beccaria, B. Alles, F. FarchioniApr 22, 1996
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Fractal formation and ordering in random sequential adsorption
We reveal the fractal nature of patterns arising in random sequential adsorption of particles with continuum power-law size distribution, P(R) Rα-1, R R max. We find that the…
N. V. Brilliantov, Yu. A. Andrienko, P. L. Krapivsky et al.Apr 22, 1996
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Can fractal-like spectra be experimentally observed in aperiodic superlattices?
We numerically investigate the effects of inhomogeneities in the energy spectrum of aperiodic semiconductor superlattices, focusing our attention on Thue-Morse and Fibonacci sequences. In the absence…
Enrique Macia, Francisco Dominguez-AdameApr 22, 1996
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