Spin Reversal of a Quantum Hall Ferromagnet at a Landau Level Crossing

被引：8

作者：

Lupatini, M. ^{[1
]}

Knuppel, P. ^{[2
]}

Faelt, S. ^{[1
,2
]}

Winkler, R. ^{[3
,4
]}

Shayegan, M. ^{[1
,5
]}

Imamoglu, A. ^{[2
]}

Wegscheider, W. ^{[1
]}

机构：

[1] Swiss Fed Inst Technol, Solid State Phys Lab, CH-8093 Zurich, Switzerland

[2] Swiss Fed Inst Technol, Inst Quantum Elect, CH-8093 Zurich, Switzerland

[3] Northern Illinois Univ, Dept Phys, De Kalb, IL 60115 USA

[4] Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA

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

来源：

PHYSICAL REVIEW LETTERS | 2020年 / 125卷 / 06期

基金：

瑞士国家科学基金会;

关键词：

OPTICALLY PUMPED NMR; CYCLOTRON-RESONANCE; SKYRMIONS; HOLE; INTEGER; WELLS;

D O I：

10.1103/PhysRevLett.125.067404

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

When Landau levels (LLs) become degenerate near the Fermi energy in the quantum Hall regime, interaction effects can drastically modify the electronic ground state. We study the quantum Hall ferromagnet formed in a two-dimensional hole gas around the LL filling factor v = 1 in the vicinity of a LL crossing in the heave-hole valence band. Cavity spectroscopy in the strong-coupling regime allows us to optically extract the spin polarization of the two-dimensional hole gas. By analyzing this polarization as a function of hole density and magnetic field, we observe a spin flip of the ferromagnet. Furthermore, the depolarization away from v = 1 accelerates close to the LL crossing. This is indicative of an increase in the size of skyrmion excitations as the effective Zeeman energy vanishes at the LL crossing.

引用

页数：6

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