Absence of localization on the 2d model with long-range correlated off-diagonal disorder

被引：15

作者：

de Moura, F. A. B. F. ^{[1
]}

机构：

[1] Univ Fed Alagoas, Inst Fis, BR-57072970 Maceio Al, Brazil

来源：

EUROPEAN PHYSICAL JOURNAL B | 2010年 / 78卷 / 03期

关键词：

METAL-INSULATOR-TRANSITION; RANDOM-DIMER MODEL; ANDERSON MODEL; DELOCALIZATION TRANSITION; MOBILITY EDGE; SUPERLATTICES; FLUCTUATIONS; TRANSPORT; CHAINS; MEDIA;

D O I：

10.1140/epjb/e2010-10579-8

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We study the one-electron eigenstates in a two-dimensional (2d) Anderson model with long-range correlated off-diagonal disorder, generated by a 2d discrete Fourier method. The dynamics of an initially localized wave packet is investigated by numerically solving the 2d time-dependent Schrodinger equation. In additional the participation number and its scaling behavior was obtained through direct diagonalization. Our numerical data suggest that the system exhibits a ballistic dynamics in the strongly correlated disorder regime. Moreover, the scaling analysis of mean participation number around the band center also indicates the presence of extended states for high degree of correlations.

引用

页码：335 / 339

页数：5

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