Authors
Rony Granek, Abraham Nitzan
Publication date
1989/4/1
Journal
The Journal of Chemical Physics
Volume
90
Issue
7
Pages
3784-3794
Publisher
AIP Publishing
Description
We study the diffusion (and conductivity) associated with the random walk of non interacting particles on a disordered lattice characterized by bond disorder, temporal rearrangement, and spatial correlations. This paper extends previous works on dynamic bond percolation processes to situations where spatial correlations in the rearrangement process are important. Many bond effective-medium theory is used to obtain the effective diffusion coefficient Delf (w) in such systems. The resulting D elf (w) depends on the frequency through combinations of the form w-i/Tj where Tj are characteristic relaxation times associated with the rearrangement process. We analyze in detail a model combining single bond renewal with a two bond exchange process. The resulting DC (w= 0) diffusion coefficient shows a new percolation threshold for the bond exchange model (in the absence of single bond renewal which eliminates the …
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