METALLIC PHASE OF THE QUANTUM HALL SYSTEM AT EVEN-DENOMINATOR FILLING FRACTIONS

被引：272
|
作者：
KALMEYER, V
ZHANG, SC
机构：
[1] IBM Research Division, Almaden Research Center, San Jose
来源：
PHYSICAL REVIEW B | 1992年 / 46卷 / 15期
关键词：
D O I：
10.1103/PhysRevB.46.9889
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We propose an explanation for the resistivity anomalies exhibited by the two-dimensional spin-polarized electron gas at nu = 1/2 and related even-denominator filling fractions. Landau-Ginzburg theory we argue that the inhomogeneity in the electron density, caused by the impurity potential, induces a spatially random distribution of statistical flux, and that electron localization can be suppressed by this random flux. As a result, a metallic phase appears in the phase diagram of the Hall system near nu = 1/2, leading to a temperature-independent resitivity minimum.
引用
收藏
页码：9889 / 9892
页数：4
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