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Condensed Matter papers — page 191

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Study of the disordered one-dimensional contact process
New theoretical and numerical analysis of the one-dimensional contact process with quenched disorder are presented. We derive new scaling relations, different from their counterparts in the pure…
Raffaele Cafiero, Andrea Gabrielli, Miguel A. MuñozDec 16, 1997
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Resistivity in the spin-gap state of the t-J model
Being motivated by recent experimental data on YBaCuO, we calculate dc resistivity in the spin-gap state of charge- spin-separated t-J model by using a massive gauge theory of holons and spinons.The…
M. onoda, I. Ichinose, T. MatsuiDec 16, 1997
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Spin Tunneling in Conducting Oxides
Direct tunneling in ferromagnetic junctions is compared with impurity-assisted, surface state assisted, and inelastic contributions to a tunneling magnetoresistance (TMR). Theoretically calculated…
Alexander BratkovskyDec 16, 1997
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Geometric phase for a dimerized disordered continuum: Topological shot noise
Geometric phase shift associated with an electron propagating through a dimerized-disordered continuum is shown to be 0, or π (modulo 2π), according as the associated circuit traversed in the…
Prabhakar Pradhan, N. KumarDec 15, 1997
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Transverse force on a quantized vortex in a superconductor
The total transverse force acting on a quantized vortex in a type-II superconductor determines the Hall response in the mixed state, yet a consensus as to its correct form is still lacking. In this…
Michael R. Geller, Carlos Wexler, David J. ThoulessDec 15, 1997
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A dipole interpretation of the ν=1/2 state
We consider the problem of Bosonic particles interacting repulsively in a strong magnetic field at the filling factor ν=1. We project the system in the Lowest Landau Level and set up a formalism to…
V. Pasquier, F. D. M. HaldaneDec 15, 1997
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Electronic shell structure of large metallic clusters in the modified harmonic oscillator
Shell structure in the single particle spectrum of deformed harmonic oscillator potentials when a term proportional to ( L)2 is added is analyzed for a large particle number. A scaling law…
W. D. Heiss, R. G. NazmitdinovDec 15, 1997
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A Hierarchical Model of Slow Constrained Dynamics
We introduce a new simple hierarchically constrained model of slow relaxation. The configurational energy has a simple form as there is no coupling among the spins defining the system; the associated…
M. A. Muñoz, A. Gabrielli, H. Inaoka et al.Dec 15, 1997
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Effect of dephasing on mesoscopic conductance fluctuations in quantum dots with single channel leads
We consider the distribution of conductance fluctuations in disordered quantum dots with single channel leads. Using a perturbative diagrammatic approach, valid for continuous level spectra, we…
Edward McCann, Igor V. LernerDec 15, 1997
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On the nature of different types of absorbing states
We present a comparison of three different types of Langevin equation exhibiting absorbing states: the Langevin equation defining the Reggeon field theory, one with multiplicative noise, and a third…
Miguel A. MuñozDec 15, 1997
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Shape anisotropy and magnetic domain structures in striped monolayers
We study the effect of dipolar interactions on a magnetic striped monolayer with a microscopic unit cell of square symmetry, and of size (Nx× Ny) spins. Even if the aspect ratio r=Nx/Ny…
Paolo Politi, Maria Gloria PiniDec 15, 1997
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Nonequilibrium transitions induced by multiplicative noise
A new simple model exhibiting a noise-induced ordering transition (NIOT) and a noise-induced disordering transition (NIDT), in which the noise is purely multiplicative, is presented. Both transitions…
Walter Genovese, Miguel A. Muñoz, J. M. SanchoDec 15, 1997
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Gyrotropic Percolation
Spiral (gyrotropic) percolation which is related to the behavior of an electron system in strong magnetic fields is studied. It is shown that the scaling behavior area near the percolation threshold…
S. N. DorogovtsevDec 15, 1997
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On a Connection Between Nonlinear Response to an External Field and Equilibrium Properties of Systems with Interaction: Comment on cond-mat/9711226 by Kopietz and Voelker
We demonstrate the danger of a naive identification of kinetic coefficients in the free-electron response expansion in powers of an external electric field and coefficients in the expansion of the…
V. E. Kravtsov, V. I. YudsonDec 14, 1997
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Giant Thermomechanical Effect in Normal Liquid He-3
Measurements are presented of the thermomechanical coefficient of normal liquid He-3 confined in a porous plug pre-plated with four monoloyers of He-4. These non-magnetic monolayers displace the…
D. L. Sawkey, D. Deptuck, D. Greenwood et al.Dec 12, 1997
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Magnetic Properties of the low dimensional spin system (VO)2P2O7: ESR and susceptibility
Experimental results on magnetic resonance (ESR) and magnetic susceptibility are given for single crystalline (VO)2P2O7. The crystal growth procedure is briefly discussed. The…
A. V. Prokofiev, F. Büllesfeld, W. Assmus et al.Dec 12, 1997
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DMRG study of the spin gap in a one dimensional Hubbard model: effect of the distant transfer and exchange coupling
The spin gap of a one-dimensional repulsive Hubbard model is numerically calculated with the density matrix renormalization group, with a special emphasis on the effect of a next-nearest neighbor…
Ryotaro Arita, Kazuhiko Kuroki, Hideo Aoki et al.Dec 12, 1997
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Dynamical Spin Response Functions for Heisenberg Ladders
We present the results of a numerical study of the 2 by L spin 1/2 Heisenberg ladder. Ground state energies and the singlet-triplet energy gaps for L = (4-14) and equal rung and leg interaction…
Danny Yang, Wick HaxtonDec 12, 1997
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Geometric Laws of Vortex Quantum Tunneling
In the semiclassical domain the exponent of vortex quantum tunneling is dominated by a volume which is associated with the path the vortex line traces out during its escape from the metastable well.…
Uwe R. FischerDec 11, 1997
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Charge redistribution at Pd surfaces: ab initio grounds for tight-binding interatomic potentials
A simplified tight-binding description of the electronic structure is often necessary for complex studies of surfaces of transition metal compounds. This requires a self-consistent parametrization of…
S. Sawaya, J. Goniakowski, C. Mottet et al.Dec 11, 1997
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Excitation spectrum in a cylindrical Bose-Einstein gas
Whole excitation spectrum is calculated within the Popov approximation of the Bogoliubov theory for a cylindrical symmetric Bose-Einstein gas trapped radially by a harmonic potential. The full…
Tomoya Isoshima, Kazushige MachidaDec 11, 1997
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Exact two-spin dynamic structure factor of the one-dimensional s=1/2 Heisenberg-Ising antiferromagnet
The exact 2-spinon part of the dynamic spin structure factor Sxx(Q,ω) for the one-dimensional s=1/2 XXZ model at T=0 in the antiferromagnetically ordered phase is calculated using recent…
A. Hamid Bougourzi, Michael Karbach, Gerhard MüllerDec 9, 1997
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Phase diagram of disordered spin-Peierls systems
We study the competition between the spin-Peierls and the antiferromagnetic ordering in disordered quasi-one-dimensional spin systems. We obtain the temperature vs disorder-strength phase diagram,…
Maxim Mostovoy, Daniel Khomskii, Jasper KnoesterDec 9, 1997
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Softening of Phase Transition in 2D Potts Model Under Quenched Bond Randomness
We have simulated, by using cluster algorithm, the q=8 state Potts model in two-dimension with varying amount of quenched bond randomness. We have shown that there exist a finite size dependent…
Fatih Yaşar, Yiğit Gündüç, Tarık ÇelikDec 9, 1997
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Dynamical Behavior of the Dissipative Two-State System
We investigate the dynamical correlation function of a quantum-mechanical two-state system which is coupled to a bosonic heat bath, utilizing the equivalence between the spin-boson Hamiltonian and…
Klaus VoelkerDec 8, 1997
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