Ac hopping conduction at extreme disorder takes place on the percolating cluster

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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.
OriginalsprogEngelsk
TidsskriftPhysical Review Letters
Vol/bind101
Udgave nummer2
Sider (fra-til)025901-1-025901-4
Antal sider4
ISSN0031-9007
DOI
StatusUdgivet - 2008

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