Transport properties of composite solid films with rough self-affine surfaces

Ehsan Nedaaee Oskoee and Muhammad Sahimi
Phys. Rev. B 74, 045413 – Published 13 July 2006

Abstract

We develop a method for computing the ac and dc conductivity σe of composite films, composed of two types of particles. The films are grown by integrating the Kardar-Parisi-Zhang and the Ginzburg-Landau equations that govern their height and the order parameter. σe is computed as a function of the film’s thickness, frequency, and several relevant morphological parameters. Simulations indicate that the surface roughness strongly affects the films’ conductivity. In particular, while σe exhibits universality if the films’ surface is smooth, the universality breaks down with a rough surface. The results also indicate the consistency of the trends in the conductivities with the morphological transitions in the films.

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  • Received 12 May 2006

DOI:https://doi.org/10.1103/PhysRevB.74.045413

©2006 American Physical Society

Authors & Affiliations

Ehsan Nedaaee Oskoee1 and Muhammad Sahimi2,*

  • 1Institute for Advanced Studies in Basic Sciences, Gava Zang, Zanjan 45195-1159, Iran
  • 2Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, California 90089-1211

  • *Electronic address: moe@iran.usc.edu

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Issue

Vol. 74, Iss. 4 — 15 July 2006

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