Quantum percolation in granular metals

被引：16

作者：

Feigel'man, MV

Ioselevich, AS

Skvortsov, MA

机构：

[1] LD Landau Theoret Phys Inst, Moscow 119334, Russia

[2] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 13期

基金：

俄罗斯基础研究基金会;

关键词：

D O I：

10.1103/PhysRevLett.93.136403

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

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 the bare charging energy scale E-C) suppress the mean conductance (g) over bar (E) much more strongly than its standard deviation sigma(E). At sufficiently low energies E-* any distribution becomes broad, with sigma(E-*)similar to(g) over bar (E-*), leading to strong local fluctuations of the tunneling density of states. The percolative nature of the metal-insulator transition is established by a combination of analytic and numerical analysis of the matrix renormalization group equations.

引用

页码：136403 / 1

页数：4

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