Quantum percolation in granular metals
介观与纳米尺度物理
2007-05-23 v1 无序系统与神经网络
摘要
Theory of quantum corrections to conductivity of granular metal films is developed for the realistic case of large randomly distributed tunnel conductances. Quantum fluctuations of intergrain voltages (at energies E much below bare charging energy scale E_C) suppress the mean conductance \bar{g}(E) much stronger than its standard deviation \sigma(E). At sufficiently low energies E_* any distribution becomes broad, with \sigma(E_*) ~ \bar{g}(E_*), leading to strong local fluctuations of the tunneling density of states. Percolative nature of metal-insulator transition is established by combination of analytic and numerical analysis of the matrix renormalization group equations.
引用
@article{arxiv.cond-mat/0404350,
title = {Quantum percolation in granular metals},
author = {M. V. Feigel'man and A. S. Ioselevich and M. A. Skvortsov},
journal= {arXiv preprint arXiv:cond-mat/0404350},
year = {2007}
}
备注
6 pages, 5 figures, REVTeX 4