Experimental studies of scaling behavior of a quantum Hall system with a tunable Landau level mixing

被引：11

作者：

Zhao, Y. J. ^{[1
]}

Tu, T. ^{[1
]}

Hao, X. J. ^{[1
]}

Guo, G. C. ^{[1
]}

Jiang, H. W. ^{[2
]}

Guo, G. P. ^{[1
]}

机构：

[1] Univ Sci & Technol China, Chinese Acad Sci, Key Lab Quantum Informat, Hefei 230026, Peoples R China

[2] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA

来源：

PHYSICAL REVIEW B | 2008年 / 78卷 / 23期

基金：

美国国家科学基金会; 中国国家自然科学基金;

关键词：

hopping conduction; Landau levels; localised states; quantum Hall effect;

D O I：

10.1103/PhysRevB.78.233301

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Temperature dependence of the longitudinal and Hall resistances is studied in the regime of localization-delocalization transition. We carry out measurements of scaling exponent kappa in the Landau level mixing region at several filling factors. The localization exponent gamma is extracted using an approach based on the variable-range hopping theory. The values of gamma and kappa are found to be universal and independent of the filling factor in our sample. We can conclude that although Landau level mixing can change the degeneracy of a quantum Hall state, the value of the scaling exponent remains the same for a given sample that contains a fixed disorder profile.

引用

页数：4

共 19 条

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