Optical Absorption to Probe the Quantum Hall Ferromagnet at Filling Factor ν=1

被引：35

作者：

Plochocka, P. ^{[1
]}

Schneider, J. M. ^{[1
]}

Maude, D. K. ^{[1
]}

Potemski, M. ^{[1
]}

Rappaport, M. ^{[2
]}

Umansky, V. ^{[2
]}

Bar-Joseph, I. ^{[2
]}

Groshaus, J. G. ^{[3
]}

Gallais, Y. ^{[3
]}

Pinczuk, A. ^{[3
]}

机构：

[1] Grenoble High Magnet Field Lab, CNRS, Lab Natl Champs Magnet Intenses, F-38042 Grenoble, France

[2] Weizmann Inst Sci, Dept Condensed Matter Phys, IL-76100 Rehovot, Israel

[3] Columbia Univ, Dept Phys & Appl Phys & Appl Math, New York, NY 10027 USA

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 12期

基金：

美国国家科学基金会;

关键词：

2-DIMENSIONAL ELECTRON-GAS; COMPOSITE FERMIONS; EXCITATIONS; SKYRMIONS; WELLS; INTEGER;

D O I：

10.1103/PhysRevLett.102.126806

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Optical absorption measurements are used to probe the spin polarization in the integer and fractional quantum Hall effect regimes. The system is fully spin polarized only at filling factor nu=1 and at very low temperatures (similar to 40 mK). A small change in filling factor (delta nu approximate to +/- 0.01) leads to a significant depolarization. This suggests that the itinerant quantum Hall ferromagnet at nu=1 is surprisingly fragile against increasing temperature, or against small changes in filling factor.

引用

页数：4

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