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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/16689
Title: Diffusion Coefficient of Particles in Lattices with Random-Barriers and Wide Distribution of Transition Rates
???metadata.dc.contributor.*???: Prof. K. W. Kehr
Baye, Hailemariamam
Issue Date: Jun-1995
Publisher: Addis Ababa University
Abstract: We have investigated the mean-square displacements of particles that perform random walks in two and three-dimensional lattices with random barriers with uniform distributions of activation energies. The lattice we considered is a mathematical lattice. For the same model Avramov, Milchev, and Argyrakis [phys.rev.E 47 2303 (1993)] discussed the crossover between anomalous and normal diffusion, but they did not Analyze the behavior of the mean-square dispalcements at long times where normal diffusion occurs. We point out that the asymptotic diffusion coefficients are well described by the effective-medium theory in the range of parameters investigated; they are in disagreement with the predictions of critical-path arguments in dimension d=3.
Description: A Thesis Presented to the School of Graduate Studies and the Faculty of Science Addis Ababa University in Partial Fulfillment of the Requirements for the Degree Master of Science in Physics
URI: http://hdl.handle.net/123456789/16689
Appears in Collections:Thesis - Physics

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