Hopping models and ac universality

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    Abstract

    Some general relations for hopping models are established. We proceed to discuss the universality of the ac conductivity which arises in the extreme disorder limit of the random barrier model. It is shown that the relevant dimension entering into the diffusion cluster approximation (DCA) is the harmonic (fracton) dimension of the diffusion cluster. The temperature scaling of the dimensionless frequency entering into the DCA is discussed. Finally, some open problems regarding ac universality are listed.
    Original languageEnglish
    JournalIPPS physica status solidi (b)
    Volume230
    Issue number1
    Pages (from-to)5-13
    ISSN0370-1972
    Publication statusPublished - 2002

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