Type of Document	Master's Thesis
Author	Thies, Michael
Author's Email Address	m.thies@tu-bs.de
URN	etd-81198-19472
Title	Scaling of Steady States in a Simple Driven Three-State Lattice Gas
Degree	Master of Science
Department	Physics
Advisory Committee	Advisor Name Title Schmittmann, Beate Committee Chair Heflin, James R. Committee Member Zia, Royce K. P. Committee Member
Keywords	Mean-Field Theo ry Driven Lattice Gas Monte Carlo Simulation Scaling
Date of Defense	1998-09-09
Availability	unrestricted
Abstract Phase segregated states in a simple three-state stochastic lattice gas are investigated. A two dimensional finite lattice with periodic boundary conditions is filled with one hole and two oppositely "charged" species of particles, subject to an excluded volume constraint. Starting from a completely disordered initial configuration, a sufficiently large external "electric" field E induces the phase segregation, by separating the charges into two strips and "trapping" the hole at an interface between them. Focusing on the steady state, the scaling properties of an appropriate order parameter, depending on drive and system size, are investigated by mean-field theory and Monte Carlo methods. Density profiles of the two interfaces in the ordered system are studied with the help of Monte Carlo simulations and are found to scale in the field-dependent variable, e = 2 tanh E /2), for E less than or greater to 0.8. For larger values of E, independent approximations of the interfacial profiles, obtained within the framework of mean-field theory, exhibit significant deviations from the Monte Carlo data. Interestingly, the deviations can be reduced significantly by a slight modification of the mean-field theory.
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