MAGNETOTRANSPORT OF A 2-DIMENSIONAL ELECTRON-GAS IN A SPATIALLY RANDOM MAGNETIC-FIELD

被引：57

作者：

MANCOFF, FB

CLARKE, RM

MARCUS, CM

ZHANG, SC

CAMPMAN, K

GOSSARD, AC

机构：

[1] IBM CORP,DIV RES,ALMADEN RES CTR,SAN JOSE,CA 95120

[2] UNIV CALIF SANTA BARBARA,DEPT MAT,SANTA BARBARA,CA 93106

来源：

PHYSICAL REVIEW B | 1995年 / 51卷 / 19期

关键词：

D O I：

10.1103/PhysRevB.51.13269

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study magnetotransport of a two-dimensional electron gas (2DEG) subject to a random magnetic field produced by a demagnetized NdFeB magnet. A large, positive, ssV-shaped magnetoresistance is observed in a perpendicular applied external field. This effect is interpreted classically in terms of a nonuniform local Hall resistivity. Depleting the 2DEG with a gate beneath the random magnet yields a crossover from positive to negative magnetoresistance at a sheet resistance h/e2. © 1995 The American Physical Society.

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页码：13269 / 13273

页数：5

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