AC response near the percolation threshold: Transfer-matrix results in two and three dimensions

A. L.R. Bug, Gary S. Grest, Morrel H. Cohen, Itzhak Webman

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

The complex admittivities of two- and three-dimensional networks of resistors and capacitors are calculated at pc using a transfer matrix. As predicted by scaling theories, the loss tangent becomes frequency independent in a critical range of frequencies. In three dimensions, for the usual model of unit conductors and capacitors at pc for the conductors, the dynamical exponents t and s are found to have values consistent with previous dc numerical studies. Similarly, the two-dimensional square site lattice and a bond lattice of superconductors and normal capacitors are both found to display dynamical scaling with universal (two-dimensional) exponents. Finally, two-dimensional networks with unit capacitors, but a power-law distribution of conductors, p()-± for ±<0 (and zero otherwise), are studied for the two cases ±=0 and 0.6. Dynamical scaling behavior is also seen on these lattices. In both cases, the bulk conductivities inferred from the dynamical scaling display nonuniversal values of the exponent t, while the exponent s remains at its universal value.

Original languageEnglish (US)
Pages (from-to)3675-3682
Number of pages8
JournalPhysical Review B
Volume36
Issue number7
DOIs
StatePublished - Jan 1 1987
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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