Density dependence of valley polarization energy for composite fermions

被引：33

作者：

Padmanabhan, Medini ^{[1
]}

Gokmen, T. ^{[1
]}

Shayegan, M. ^{[1
]}

机构：

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

来源：

PHYSICAL REVIEW B | 2009年 / 80卷 / 03期

关键词：

ELECTRON-SPIN POLARIZATION; PHASE-DIAGRAM; TRANSITION; NU=1/2; SYSTEM; NU=2/3;

D O I：

10.1103/PhysRevB.80.035423

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In two-dimensional electron systems confined to wide AlAs quantum wells, composite fermions around the filling factor nu = 3/2 are fully spin polarized but possess a valley degree of freedom. Here we measure the energy needed to completely valley polarize these composite fermions as a function of electron density. Comparing our results to the existing theory, we find overall good quantitative agreement but there is an unexpected trend: the measured composite fermion valley polarization energy, normalized to the Coulomb energy, decreases with decreasing density.

引用

页数：5

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