QUANTUM MAGNETOTRANSPORT IN A 2-DIMENSIONAL SQUARE ARRAY OF SCATTERERS

被引:5
作者
GUMBS, G
HUANG, DH
机构
[1] Department of Physics and Astronomy, Hunter College City University of New York, New York, NY 10021
关键词
D O I
10.1006/spmi.1993.1096
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
The longitudinal (ρxx) and Hall (ρxy) resistivities are calculated for a two-dimensional square array of scatterers, which are simulated by an array of positive delta-functions. We find that when the potential is strong, ρxy can be negative and quenched and ρxx shows commensurate oscillations. Similar features have been observed experimentally for antidots in both the quasiclassical and the quantum regimes. The quenching of ρxy is explained by the collimated states formed by electrons scattering resonantly off the lattice sites in a magnetic field when the magnetic translational period and reciprocal lattice vector become commensurate. Impurities do not qualitatively change ρxy but they can quantitatively change ρxx. Numerical results are presented to show how the lattice, impurity scattering, and the electron density affect the quenching of the Hall effect and the commensurate oscillations. © 1993 Academic Press. All rights reserved.
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页码:1 / 14
页数:14
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