Magnetic anisotropy in quantum Hall ferromagnets

被引：74

作者：

Jungwirth, T ^{[1
]}

Shukla, SP

Smrcka, L

Shayegan, M

MacDonald, AH

机构：

[1] Indiana Univ, Dept Phys, Bloomington, IN 47405 USA

[2] Inst Phys ASCR, Prague 16200 6, Czech Republic

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

来源：

PHYSICAL REVIEW LETTERS | 1998年 / 81卷 / 11期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.81.2328

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We show that the sign of magnetic anisotropy energy in quantum Hall ferromagnets is determined by a competition between electrostatic and exchange energies. Easy-axis ferromagnets tend to occur when Landau levels whose states have similar spatial profiles cross. We report measurements of integer quantum Hall effect (QHE) evolution with magnetic-field tilt. Reentrant behavior observed for the v = 4 QHE at high tilt angles is attributed to easy-axis anisotropy. This interpretation is supported by a detailed calculation of the magnetic anisotropy energy.

引用

页码：2328 / 2331

页数：4

共 30 条

[1] ENERGY-SPECTRUM AND CHARGE-DENSITY-WAVE INSTABILITY OF A DOUBLE QUANTUM-WELL IN A MAGNETIC-FIELD [J].