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Condensed Matter papers — page 243

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The approach to scaling in phase-ordering kinetics
The influence of the initial fluctuations on the onset of scaling in the quench to zero temperature of a two dimensional system with conserved order parameter, is analyzed in detail with and without…
Claudio Castellano, Marco ZannettiJul 26, 1996
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Fluctuations in a Spin Glass model with 1RSB
We discuss Gaussian fluctuations in a spin glass model with one replica symmetry breaking. We show how non-perturbative fluctuations of the break-point parameter can be included in the longitudinal…
M. E. Ferrero, G. Parisi, P. RanieriJul 26, 1996
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Quasiperiodic Modulated-Spring Model
We study the classical vibration problem of a chain with spring constants which are modulated in a quasiperiodic manner, i. e., a model in which the elastic energy is $Σj kj(…
H. Hiramoto, Mahito KohmotoJul 26, 1996
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Pinning and Tribology of Tethered Monolayers on Disordered Substrates
We study the statistical mechanics and dynamics of crystalline films with a fixed internal connectivity on a random substrate. Defect free triangular lattices exhibit a sharp transition to a low…
Carlo Carraro, David R. NelsonJul 25, 1996
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Magnetic Properties of the Skyrmion Gas in Two Dimensions
The classical ferromagnet is analyzed in two dimensions via a mean-field treatment of the CP1 model valid in the limit of low temperature and of weak magnetic field. At high skyrmion densities, we…
J. P. RodriguezJul 25, 1996
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Loop models, Marginally Rough Interfaces, and the Coulomb Gas
We develop a coarse-graining procedure for two-dimensional models of fluctuating loops by mapping them to interface models. The result is an effective field theory for the scaling limit of loop…
Jane' KondevJul 25, 1996
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Field Theories for Learning Probability Distributions
Imagine being shown N samples of random variables drawn independently from the same distribution. What can you say about the distribution? In general, of course, the answer is nothing, unless we…
William Bialek, Curtis G. Callan, S. P. StrongJul 25, 1996
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Polaronic optical absorption of the Holstein and Su-Schrieffer-Heeger models
The optical conductivity of a polaronic charge carrier in the intermediate and strong-coupling regimes is calculated for a tight-binding electron using exact diagonalization. Two different simple…
M. Capone, W. StephanJul 25, 1996
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Charge and Spin Response of the Spin--Polarized Electron Gas
The charge and spin response of a spin--polarized electron gas is investigated including terms beyond the random phase approximation. We evaluate the charge response, the longitudinal and transverse…
Kyung-Soo Yi, J. J. QuinnJul 25, 1996
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Plasmon Modes and Correlation Functions in Quantum Wires and Hall Bars
We present microscopic derivations of the one-dimensional low-energy boson effective Hamiltonians of quantum wire and quantum Hall bar systems. The quantum Hall system is distinguished by its spatial…
U. Zuelicke, A. H. MacDonaldJul 24, 1996
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Variational study of a dilute Bose condensate in a harmonic trap
A two-parameter trial condensate wave function is used to find an approximate variational solution to the Gross-Pitaevskii equation for N0 condensed bosons in an isotropic harmonic trap with…
Alexander L. FetterJul 24, 1996
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Evolution on a smooth landscape
We study in detail a recently proposed simple discrete model for evolution on smooth landscapes. An asymptotic solution of this model for long times is constructed. We find that the dynamics of the…
David A. Kessler, Herbert Levine, Douglas Ridgway et al.Jul 24, 1996
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Low Temperature Upper Critical Field Anomalies in Clean Superconductors
We interpret the upper-critical-field anomalies observed in some high- temperature superconductors as resulting from the proximity to a zero-temperature quantum critical point. We estimate the shape…
Gabriel Kotliar, Chandra VarmaJul 24, 1996
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Grand Canonical Partition Function for Unidimensional Systems: Application to Hubbard Model up to Order beta3
We exploit the grassmannian nature of the variables involved in the path integral expression of the grand canonical partition function for self--interacting fermionic models to show, in one-space…
I. C. Charret, S. M. de Souza, M. T. Thomaz et al.Jul 24, 1996
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Analytic calculations of trial wave functions of the fractional quantum Hall effect on the sphere
We present a framework for the analytic calculations of the hierarchical wave functions and the composite fermion wave functions in the fractional quantum Hall effect on the sphere by using…
Carmem Lucia de Souza Batista, Dingping LiJul 24, 1996
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Collision-induced friction in the motion of a particle on a bumpy inclined plane
By means of Molecular Dynamics simulations, we investigate the elementary process of avalanches and size segregation by surface flow in 2 dimensions: a single ball confined to moving along an…
S. Dippel, G. G. Batrouni, D. E. WolfJul 24, 1996
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Long Wavelength Anomalous Diffusion Mode in the 2D XY Dipole Magnet
In 2D XY ferromagnet the dipole force induces a strong interaction between spin-waves in the long-wavelength limit. The major effect of this interaction is the transformation of a propagating…
Ar. Abanov, A. Kashuba, V. L. PokrovskyJul 24, 1996
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Towards granular hydrodynamics in two-dimensions
We study steady-state properties of inelastic gases in two-dimensions in the presence of an energy source. We generalize previous hydrodynamic treatments to situations where high and low density…
E. L. Grossman, T. Zhou, E. Ben-NaimJul 23, 1996
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Renormalisation group approach to reaction-diffusion problems
This is the text of a talk given at the conference in memory of Claude Itzykson at Saclay in June 1996. It contains an introductory survey and an account of recent developments in the field theoretic…
John CardyJul 23, 1996
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Confinement in a Double Barrier Structure in the Presence of an Electric Field
The effect of electric field on the electron resonant tunnelling into a double barrier structure is studied. We show for particular field strengths an increase of the tunnelling time which leads us…
S. M. A. Nimour, N. Zekri, R. OuastiJul 23, 1996
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Low temperature equilibrium correlation functions in dissipative quantum systems
We introduce a new theoretical approach to dissipative quantum systems. By means of a continuous sequence of infinitesimal unitary transformations, we decouple the small quantum system that one is…
Stefan K. Kehrein, Andreas MielkeJul 23, 1996
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Activated resistivities in the integer quantum Hall effect
We have determined the off-diagonal and diagonal conductivities for a quantum Hall effect system at exactly integer filling at finite temperatures and in the presence of weak short ranged disorder…
Sudhansu S. Mandal, V. RavishankarJul 23, 1996
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Deterministic Soluble Model of Coarsening
We investigate a 3-phase deterministic one-dimensional phase ordering model in which interfaces move ballistically and annihilate upon colliding. We determine analytically the autocorrelation…
L. Frachebourg, P. L. KrapivskyJul 23, 1996
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Dynamics of compressible edge and bosonization
We work out the dynamics of the compressible edge of the quantum Hall system based on the electrostatic model of Chklovskii et al.. We introduce a generalized version of Wen's hydrodynamic…
J. H. Han, D. J. ThoulessJul 23, 1996
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Effective Field Theory of ideal-fluid Hydrodynamics
Starting from a standard description of an ideal, isentropic fluid, we derive the effective theory governing a gapless non-relativistic mode---the sound mode. The theory, which is dictated by the…
Adriaan M. J. SchakelJul 23, 1996
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