DIFFUSION UNDER CROSSED LOCAL AND GLOBAL BIASES IN DISORDERED SYSTEMS

Sitangshu Bikas Santra () and William A. Seitz
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Sitangshu Bikas Santra: Department of Physics, Indian Institute of Technology, Kanpur 208016, India;
William A. Seitz: Texas A & M University at Galveston, TX553-1675, U.S.A.

International Journal of Modern Physics C (IJMPC), 2000, vol. 11, issue 07, 1357-1369

Abstract: Diffusion on 2D site percolation clusters atp = 0.7, 0.8, and 0.9 abovepcon the square lattice in the presence of two crossed bias fields, a local biasBand a global biasE, has been investigated. The global biasEis applied in a fixed global direction whereas the local biasBimposes a rotational constraint on the motion of the diffusing particle. The rms displacementRt~ tkin the presence of both biases is studied. Depending on the strength ofEandB, the behavior of the random walker changes from diffusion to drift to no-drift or trapping. There is always diffusion for finiteBwith no global bias. A crossover from drift to no-drift at a critical global biasEcis observed in the presence of local biasBfor all disordered lattices. At the crossover, value of the rms exponent changes fromk = 1tok

Keywords: Diffusion; Percolation; Crossed Bias Fields; Monte Carlo (search for similar items in EconPapers)
Date: 2000
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DOI: 10.1142/S0129183100001188

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