Abstract
Granular systems, at temperatures where charging effects are important, are studied by means of an effective medium approximation. The intragrain charging energy leads to insulating behavior at low temperatures, with a well defined Coulomb gap. Nonequilibrium effects can give rise to a zero-temperature transition between a metallic, gapless phase, and an insulating phase.
- Received 29 November 2002
DOI:https://doi.org/10.1103/PhysRevB.68.085306
©2003 American Physical Society
