Valley polarization and susceptibility of composite fermions around a filling factor v = 3/2

被引：68

作者：

Bishop, N. C. ^{[1
]}

Padmanabhan, M. ^{[1
]}

Vakili, K. ^{[1
]}

Shkolnikov, Y. P. ^{[1
]}

De Poortere, E. P. ^{[1
]}

Shayegan, M. ^{[1
]}

机构：

[1] Princeton Univ, Dept Elect Engn, Princeton, NJ 08544 USA

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 98卷 / 26期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.98.266404

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report magnetotransport measurements of fractional quantum Hall states in an AlAs quantum well around a Landau level filling factor nu = 3/2, demonstrating that the quasiparticles are composite fermions (CFs) with a valley degree of freedom. By monitoring the valley level crossings for these states as a function of applied symmetry-breaking strain, we determine the CF valley susceptibility and polarization. The data can be explained well by a simple Landau level fan diagram for CFs, and are in nearly quantitative agreement with the results reported for CF spin polarization.

引用

页数：4

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