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

被引：56
|
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.
引用
收藏
页码：13269 / 13273
页数：5
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