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Condensed Matter papers — page 147

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Single-vehicle data of highway traffic - a statistical analysis
In the present paper single-vehicle data of highway traffic are analyzed in great detail. By using the single-vehicle data directly empirical time-headway distributions and speed-distance relations…
L. Neubert, L. Santen, A. Schadschneider et al.May 14, 1999
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Is there an Optimal Substrate Geometry for Wetting ?
We consider the problem of the Winterbottom's construction and Young's equation in the presence of a rough substate and establish their microscopic validity within a 1+1-dimensional SOS type…
Joel De Coninck, Salvador Miracle-Sole, Jean RuizMay 14, 1999
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Dynamics of the Measurement of Nuclear Spins in a Solid-State Quantum Computer
We study numerically the process of nuclear spin measurement in a solid-state quantum computer of the type proposed by Kane by modeling the quantum dynamics of two coupled nuclear spins on 31P…
Gennady P. Berman, David K. Campbell, Gary D. Doolen et al.May 13, 1999
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Numerical signs for a transition in the 2d Random Field Ising Model at T=0
Intensive numerical studies of exact ground states of the 2-d ferromagnetic random field Ising model at T=0 with gaussian distribution of fields are presented. Standard finite size scaling analysis…
Carlos Frontera, Eduard VivesMay 13, 1999
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Phonon-mediated thermal conductance of mesoscopic wires with rough edges
We present an analysis of acoustic phonon propagation through long, free-standing, insulating wires with rough surfaces. Due to a crossover from ballistic propagation of the lowest-frequency phonon…
A. Kambili, G. Fagas, Vladimir I. Fal'ko et al.May 12, 1999
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Vacancy-assisted domain-growth in asymmetric binary alloys: a Monte Carlo study
A Monte Carlo simulation study of the vacancy-assisted domain-growth in asymmetric binary alloys is presented. The system is modeled using a three-state ABV Hamiltonian which includes an asymmetry…
Marcel Porta, Eduard Vives, Teresa CastanMay 12, 1999
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Failure time and microcrack nucleation
The failure time of samples of heterogeneous materials (wood, fiberglass) is studied as a function of the applied stress. It is shown that in these materials the failure time is predicted with a good…
A. Guarino, S. Ciliberto, A. GarcimartinMay 12, 1999
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Collective oscillations of an interacting trapped Fermi gas
We calculate the effects of two-body interactions on the low frequency oscillations of a normal Fermi gas confined in a harmonic trap. The mean field contribution to the collective frequencies is…
L. Vichi, S. StringariMay 12, 1999
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Thermodynamic functions within the van Hove BCS model: Symmetry mixing effects
All the new layer perovskite superconductors seem to show a phenomenon of symmetry mixing with repect to the order parameter. An analysis of the different alternative of mixing and how far could them…
D. Quesada, R. Peña, C. Trallero-GinerMay 10, 1999
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Model for nucleation in GaAs homoepitaxy derived from first principles
The initial steps of MBE growth of GaAs on beta 2-reconstructed GaAs(001) are investigated by performing total energy and electronic structure calculations using density functional theory and a…
P. Kratzer, C. G. Morgan, M. SchefflerMay 10, 1999
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On the Structure of the Bose-Einstein Condensate Ground State
We construct a macroscopic wave function that describes the Bose-Einstein condensate and weakly excited states, using the su(1,1) structure of the mean-field hamiltonian, and compare this state with…
A. I. Solomon, Y. Feng, V. PennaMay 7, 1999
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Pseudo-Gap Phase, the Quantum-Critical Point and superconductivity in Copper-Oxide Metals
A systematic solution of a general model for Copper-Oxides reveals a line of transitions T = Tp (x) for x, the doping away from half-filling less than a critical value, to a phase with broken…
C. M. VarmaMay 7, 1999
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Constant rate linear interface depinning and self organized criticality
The precise determination of the universality classes in self-organized critical phenomena (SOC) is still an unsolved problem. Different SOC models like sandpile, linear interface depinning, and the…
Alexei Vazquez, Oscar Sotolongo-CostaMay 7, 1999
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Quantum Kinetic Theory V: Quantum kinetic master equation for mutual interaction of condensate and noncondensate
A detailed quantum kinetic master equation is developed which couples the kinetics of a trapped condensate to the vapor of non-condensed particles. This generalizes previous work which treated the…
C. W. Gardiner, P. ZollerMay 7, 1999
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A measure of conductivity for lattice fermions at finite density
We study the linear response to an external electric field of a system of fermions in a lattice at zero temperature. This allows to measure numerically the Euclidean conductivity which turns out to…
J. L. Alonso, L. A. Fernandez, V. Martin-MayorMay 6, 1999
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Mutual synchronization and clustering in randomly coupled chaotic dynamical networks
We introduce and study systems of randomly coupled maps (RCM) where the relevant parameter is the degree of connectivity in the system. Global (almost-) synchronized states are found (equivalent to…
Susanna C. Manrubia, Alexander S. MikhailovMay 6, 1999
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Analysis of the approximations used in the van Hove-BCS theory
An analysis of the different approaches used within the van Hove BCS model for the high temperature superconductors has been done. How far the employment of an asymptotic expression for the density…
D. Quesada, A. Rubio-Ponce, R. Pena et al.May 6, 1999
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Correlated Fermions in a one-dimensional quasiperiodic potential
We study analytically one-dimensional interacting spinless fermions in a Fibonacci potential. We show that the effects of the quasiperiodic modulation are intermediate between those of a commensurate…
J. Vidal, D. Mouhanna, T. GiamarchiMay 6, 1999
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Magic Islands and Barriers to Attachment: A Si/Si(111)7x7 Growth Model
Surface reconstructions can drastically modify growth kinetics during initial stages of epitaxial growth as well as during the process of surface equilibration after termination of growth. We…
J. Myslivecek, T. Jarolimek, P. Smilauer et al.May 6, 1999
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Evolutionary dynamics in the Bak-Sneppen model on small-world networks
We study the dynamics of the Bak-Sneppen model on small-world networks. For each site in the network, we define a ``connectance,'' which measures the distance to all other sites. We find…
R. V. Kulkarni, E. Almaas, D. StroudMay 6, 1999
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Trapped Bose-Einstein Condensates: Role of Dimensionality
We analyse systematically, from the viewpoint of the nonlinear physics of solitary waves, the effect of the spatial dimension (D = 1,2,3) on the structure and stability of the Bose-Einstein…
Yuri S. Kivshar, Tristram J. AlexanderMay 5, 1999
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Heavy-Fermions in a Transition-Metal Compound: LiV2O4
The recent discovery of heavy-Fermion properties in Lithium Vanadate and the enormous difference in its properties from the properties of Lithium Titanate as well as of the manganite compounds raise…
C. M. VarmaMay 4, 1999
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Universality in quantum parametric correlations
We investigate the universality of correlation functions of chaotic and disordered quantum systems as an external parameter is varied. A new, general scaling procedure is introduced which makes the…
P. Leboeuf, M. SieberMay 3, 1999
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Phase Diagram Of The Biham-Middleton-Levine Traffic Model In Three Dimensions
We study numerically the behavior of the Biham-Middleton-Levine traffic model in three dimensions. Our extensive numerical simulations show that the phase diagram for this model in three dimensions…
H. F. Chau, K. Y. WanMay 3, 1999
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A new quantum phase in two dimensions
For intermediate Coulomb energy to Fermi energy ratios rs, spinless fermions in a random potential form a new quantum phase which is different from the Fermi glass and the Wigner crystal. From a…
Giuliano Benenti, Xavier Waintal, Jean-Louis PichardMay 3, 1999
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