REENTRANT LOCALIZATION AND A MOBILITY GAP IN SUPERLATTICE MINIBANDS

被引：26

作者：

FERTIG, HA

DASSARMA, S

机构：

[1] Center for Theoretical Physics, Department of Physics and Astronomy, University of Maryland, College Park

来源：

PHYSICAL REVIEW B | 1990年 / 42卷 / 02期

关键词：

D O I：

10.1103/PhysRevB.42.1448

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We develop a theory of the mobility edge for transport in superlattice minibands. For small W, where 2W is the bandwidth, the mobility edge Ec diverges as ln1/W, so that all states are localized in the limit W0. For large values of Wwe find Ec1/W, and the system behaves as an anisotropic conductor. For intermediate values of W, the system can develop a mobility gapa band of localized statesat the Van Hove singularity in the density of states. This reentrant localization behavior should be experimentally observable and may explain some recent experimental results. © 1990 The American Physical Society.

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页码：1448 / 1451

页数：4

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