Charge Transport in the Dense Two-Dimensional Coulomb Gas
arXiv:cond-mat/9704196 · doi:10.1103/PhysRevLett.78.4324
Abstract
The dynamics of a globally neutral system of diffusing Coulomb charges in two dimensions, driven by an applied electric field, is studied in a wide temperature range around the Berezinskii-Kosterlitz-Thouless transition. I argue that the commonly accepted ``free particle drift'' mechanism of charge transport in this system is limited to relatively low particle densities. For higher densities, I propose a modified picture involving collective ``partner transfer'' between bound pairs. The new picture provides a natural explanation for recent experimental and numerical findings which deviate from standard theory. It also clarifies the origin of dynamical scaling in this context.
4 pages, RevTeX, 2 eps figures included; some typos corrected, final version to be published in Phys. Rev. Lett
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