Non-linear conductivity in Coulomb glasses

被引：3

作者：

Caravaca, M. ^{[1
]}

Vojeje, A. ^{[2
]}

Bergli, J. ^{[2
]}

Ortuno, M. ^{[1
]}

Somoza, A. M. ^{[1
]}

机构：

[1] Univ Murcia, Dept Fis, CIO&N, E-30071 Murcia, Spain

[2] Univ Oslo, Dept Phys, N-0316 Oslo, Norway

来源：

ANNALEN DER PHYSIK | 2009年 / 18卷 / 12期

关键词：

Coulomb glass; nonlinear conductivity; hopping; Monte Carlo; SYSTEMS; ALGORITHM;

D O I：

10.1002/andp.200910377

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have studied the nonlinear conductivity of two-dimensional Coulomb glasses. We have used a Monte Carlo algorithm to simulate the dynamic of the system under an applied electric field E. We have compared results for two different models: a regular square lattice with only diagonal disorder and a random array of sites with diagonal and off-diagonal disorder. We have found that for moderate fields the logarithm of the conductivity is proportional to root E/T-2, reproducing experimental results. We have also found that in the nonlinear regime the site occupancy in the Coulomb gap follows a Fermi-Dirac distribution with an effective temperature T-eff higher than the phonon bath temperature T. (C) 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

引用

页码：873 / 876

页数：4

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