Anisotropic thermally activated diffusion in percolation systems

被引:2
作者
Bustingorry, S [1 ]
Insua, GL
机构
[1] Ctr Atom Bariloche, Consejo Nacl Invest Cient & Tecn, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina
[2] Univ Nacl Comahue, Dept Fis, RA-8300 Neuquen, Argentina
来源
PHYSICAL REVIEW E | 2003年 / 68卷 / 01期
关键词
D O I
10.1103/PhysRevE.68.012101
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
We present a study of static and frequency-dependent diffusion with anisotropic thermally activated transition rates in a two-dimensional bond percolation system. The approach accounts for temperature effects on diffusion coefficients in disordered anisotropic systems. Static diffusion shows an Arrhenius behavior for low temperatures with an activation energy given by the highest energy barrier of the system. From the frequency-dependent diffusion coefficients, we calculate a characteristic frequency omega(c)similar to1/t(c), related to the time t(c) needed to overcome a characteristic barrier. We find that omega(c) follows an Arrhenius behavior with different activation energies in each direction.
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页数:4
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