Anderson localization in correlated fermionic mixtures

被引：5

作者：

Fialko, O. ^{[1
]}

Ziegler, K. ^{[1
]}

机构：

[1] Univ Augsburg, Inst Phys, D-86135 Augsburg, Germany

来源：

EPL | 2009年 / 85卷 / 06期

关键词：

FALICOV-KIMBALL MODEL; SCALING THEORY; MOBILITY EDGE; ATOMS; TRANSITION; DIFFUSION; ELECTRONS; DISORDER; LATTICES; ABSENCE;

D O I：

10.1209/0295-5075/85/60003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A mixture of two fermionic species with different masses is studied in an optical lattice. The heavy fermions are subject only to thermal fluctuations, the light fermions also to quantum fluctuations. We derive the Ising-like distribution for the heavy atoms and study the localization properties of the light fermions numerically by a transfer-matrix method. In a two-dimensional system one-parameter scaling of the localization length is found with a transition from delocalized states at low temperatures to localized states at high temperature. The critical exponent of the localization length is v approximate to 0.88. Copyright (C) EPLA, 2009

引用

页数：5

共 24 条

[1] SCALING THEORY OF LOCALIZATION - ABSENCE OF QUANTUM DIFFUSION IN 2 DIMENSIONS [J].