Abstract
Simulations of the random barrier model show that ac currents at extreme disorder are carried almost entirely by the percolating cluster slightly above threshold; thus contributions from isolated low activation-energy clusters are negligible. The effective medium approximation in conjunction with the Alexander-Orbach conjecture lead to an excellent analytical fit to the universal ac conductivity with no nontrivial fitting parameters.
Originalsprog | Engelsk |
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Tidsskrift | Physical Review Letters |
Vol/bind | 101 |
Udgave nummer | 2 |
Sider (fra-til) | 025901-1-025901-4 |
Antal sider | 4 |
ISSN | 0031-9007 |
DOI | |
Status | Udgivet - 2008 |