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Condensed Matter papers — page 274

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From the Plateau problem to periodic minimal surfaces in lipids, surfactants and diblock copolymers
We present the novel method for generation of periodic surfaces based on the simple Landau-Ginzburg model of microemulsion. We test the method on four minimal surfaces (P,D,G, and I-WP), find two new…
W. T. Gozdz, R. HolystApr 1, 1996
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Coherent transport in a normal diffusive wire between two reservoirs
We develop a detailed analysis of electron transport in normal diffusive con- ductors in the presence of proximity induced superconductivity. A rich structure of temperature and energy dependencies…
A. D. Zaikin, F. K. Wilhelm, A. A. GolubovApr 1, 1996
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Phase coherent transport in hybrid superconducting structures: the case of d-wave superconductors
We examine the effect of d-wave symmetry on zero bias anomalies in normal-superconducting tunnel junctions and phase-periodic conductances in Andreev interferometers. In the presence of d-wave…
P. M. A. Cook, R. Raimondi, C. J. LambertApr 1, 1996
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The Role of Nonequilibrium Dynamical Screening in Carrier Thermalization
We investigate the role played by nonequilibrium dynamical screening in the thermalization of carriers in a simplified two-component two-band model of a semiconductor. The main feature of our…
Girish S. Setlur, Y. C. ChangMar 31, 1996
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Mapping of the Calogero-Sutherland model to the Gaussian model
The density-density correlation function of the Calogero-Sutherland model is represented as a Fourier transformation of the correlation function of bosonic exponents in the Gaussian model on a curved…
A. M. TsvelikMar 31, 1996
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Linear and nonlinear optical characteristics of the Falicov-Kimball model
We calculate the linear and nonlinear optical properties of the Falicov-Kimball model for a mixed-valent system within the self-consistent mean-field approximation. Second-harmonic generation can…
T. Portengen, Th. Ostreich, L. J. ShamMar 31, 1996
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Giant Oscillations of Acoustoelectric Current in a Quantum Channel
A theory of d.c. electric current induced in a quantum channel by a propagating surface acoustic wave (acoustoelectric current) is worked out. The first observation of the acoustoelectric current in…
Harald Totland, Yuri GalperinMar 31, 1996
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Fragile-glass behavior of a short range p-spin model
In this paper we propose a short range generalization of the p-spin interaction spin-glass model. The model is well suited to test the idea that an entropy collapse is at the bottom-line of the…
Diego Alvarez, Silvio Franz, Felix RitortMar 31, 1996
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Evidence for Deviations from Fermi-Liquid Behaviour in (2+1)-Dimensional Quantum Electrodynamics and the Normal Phase of High-Tc Superconductors
We provide evidence that the gauge-fermion interaction in multiflavour quantum electrodynamics in (2 + 1)-dimensions is responsible for non-fermi liquid behaviour in the infrared, in the sense of…
I. J. R. Aitchison, N. E. MavromatosMar 30, 1996
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Spectral Flow and Vortex Dynamics in Superfluids, Superconductors and Ferromagnets
We discuss the nondissipative Magnus-type force acting on linear defects in Fermi systems, such as Abrikosov vortices in superconductors, singular and continuous vortices in superfluid phases of…
G. E. VolovikMar 30, 1996
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Transverse force on a quantized vortex in a superfluid
We have derived an exact expression for the total nondissipative transverse force acting on a quantized vortex moving in a uniform background. The derivation is valid for neutral boson or fermion…
D. J. Thouless, P. Ao, Q. NiuMar 30, 1996
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High Temperature Expansion Study of the Nishimori multicritical Point in Two and Four Dimensions
We study the two and four dimensional Nishimori multicritical point via high temperature expansions for the J distribution, random-bond, Ising model. In 2d we estimate the the critical…
Rajiv R. P. Singh, Joan AdlerMar 30, 1996
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Long-lived charged multiple-exciton complexes in strong magnetic fields
We consider the charged exciton complexes of an ideal two-dimensional electron-hole system in the limit of strong magnetic fields. A series of charged multiple-exciton states is identified and…
J. J. Palacios, D. Yoshioka, A. H. MacDonaldMar 29, 1996
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Two-dimensional oriented self-avoiding walks with parallel contacts
Oriented self-avoiding walks (OSAWs) on a square lattice are studied, with binding energies between steps that are oriented parallel across a face of the lattice. By means of exact enumeration and…
G. T. Barkema, S. FlesiaMar 29, 1996
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Edge State Transport in Separately Contacted Double-Layer Quantum Hall Systems
We develop a theory of edge state transport in separately contacted double-layer quantum Hall systems which are tuned close to the resonance condition for tunneling between the layers. When applied…
D. Yoshioka, A. H. MacDonaldMar 29, 1996
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Fractional Aharonov-Bohm effect in mesoscopic rings
We study the effects of correlations on a one dimensional ring threaded by a uniform magnetic flux. In order to describe the interaction between particles, we work in the framework of the U ∞…
V. Ferrari, G. ChiappeMar 29, 1996
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The Four-Dimensional XY Spin Glass
The nearest-neighbour XY spin glass on a hypercubic lattice in four dimensions is studied by Monte Carlo simulations. A finite- size scaling analysis of the data leads to a finite temperature spin…
S. JainMar 29, 1996
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Density waves in dry granular media falling through a vertical pipe
We report experimental measurements of density waves in granular materials flowing down in a capillary tube. The density wave regime occurs at intermediate flow rates between a low density free fall…
T. Raafat, J. P. Hulin, H. J. HerrmannMar 29, 1996
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Effect of Quantum Fluctuations on Magnetic Ordering in CaV3O7
We present a theoretical model for CaV3O7: the 1/4-depleted square spin-1/2 Heisenberg model which includes both the nearest-neighbor coupling (J) and the next-nearest-neighbor coupling…
Hiroshi Kontani, M. E. Zhitomirsky, Kazuo UedaMar 29, 1996
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Quantum Breathers in a Nonlinear Lattice
We study nonlinear phonon excitations in a one-dimensional quantum nonlinear lattice model using numerical exact diagonalization. We find that multi-phonon bound states exist as eigenstates which are…
W. Z. Wang, J. Tinka Gammel, A. R. Bishop et al.Mar 29, 1996
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Plasmons in simple-metal slabs: a semiclassical approach
Collective excitations in simple metal systems can be described successfully in terms of a local one-body excitation operator Q, due to the long range nature of the coulomb interaction. For the…
S. Leseduarte, J. Sellares, A. TravessetMar 29, 1996
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Majorana Fermion Representation For An Antiferromagnetic Spin-1/2 Chain
We study the 1-dimensional Heisenberg antiferromagnet with s=1/2 using a Majorana representation of the s=1/2 spins. A simple Hartree-Fock approximation of the resulting model gives a bilinear…
B. Sriram Shastry, Diptiman SenMar 28, 1996
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Absence of Persistent Magnetic Oscillations in Type-II Superconductors
We report on a numerical study intended to examine the possibility that magnetic oscillations persist in type II superconductors beyond the point where the pairing self-energy exceeds the normal…
M. R. Norman, A. H. MacDonaldMar 28, 1996
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New phase diagram of Zn-doped CuGeO3
A series of high-quality single crystals of Cu1-xZnxGeO3 have been examined by neutron scattering techniques. An antiferromagnetic (AF) ordering is confirmed for samples with x≥ 0.02,…
Y. Sasago, N. Koide, K. Uchinokura et al.Mar 28, 1996
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Intrinsic mechanism of phase locking in two-dimensional Josephson junction networks in presence of an external magnetic field
We present numerical simulations of the dynamics of two-dimensional Josephson junction arrays to study the mechanism of mutual phase locking. We show that in the presence of an external magnetic…
W. Krech, K. Yu. PlatovMar 28, 1996
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