Tunneling and Percolation in Metal-Insulator Composite Materials

Details Tunneling and Percolation in Metal-Insulator Composite Materials Tunneling and Percolation in Metal-Insulator Composite Materials

2003-06-03

arxiv.org/abs/cond-mat/0306059v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

12 pages, 3 figures, accepted to Phys. Rev. B. Rapid Communication

Scientific paper

10.1103/PhysRevB.68.041403

In many composites the electrical transport takes place only by tunneling between isolated particles. For a long time it was quite a puzzle how, in spite of the incompatibility of tunneling and percolation networks, these composites conform well to percolation theory. We found, by conductance atomic force microscopy measurements on granular metals, that it is the apparent cut-off of the tunneling to non-nearest neighbors that brings about this behavior. In particular, the percolation cluster is shown to consist of the nearest-neighbors sub-network of the full tunneling network.

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