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

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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.
Original languageEnglish
JournalPhysical Review Letters
Issue number2
Pages (from-to)025901-1-025901-4
Number of pages4
Publication statusPublished - 2008

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