Nuclear spin dynamics in [001] AlAs quantum well in the regime of integer and fractional quantum Hall effect

被引：1

作者：

Shchepetilnikov, A., V ^{[1
]}

Frolov, D. D. ^{[1
]}

Nefyodov, Yu A. ^{[1
]}

Kulik, L., V ^{[1
]}

Kukushkin, I., V ^{[1
]}

Tiemann, L. ^{[2
]}

Reichl, C. ^{[3
]}

Dietsche, W. ^{[3
]}

Wegscheider, W. ^{[3
]}

机构：

[1] RAS, Inst Solid State Phys, Moscow 142432, Russia

[2] Univ Hamburg, Ctr Hybrid Nanostruct CHyN, Luruper Chaussee 149, D-22607 Hamburg, Germany

[3] Swiss Fed Inst Technol, Solid State Phys Lab, Schafmattstr 16, CH-8093 Zurich, Switzerland

来源：

SOLID STATE COMMUNICATIONS | 2019年 / 291卷

基金：

俄罗斯科学基金会;

关键词：

Spin dynamics; Electron paramagnetic resonance; Quantum wells; Quantum Hall effect; MAGNETIC-RESONANCE;

D O I：

10.1016/j.ssc.2019.01.007

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Relaxation of nuclear spins located in the vicinity of 2D electron system confined in a 16 nm [001] AlAs/AlGaAs quantum well was studied with the aid of electron spin resonance (ESR) in the regime of integer and fractional quantum Hall effect. Nuclear spin-lattice relaxation time tau was measured from the time decay of the Overhauser shift near different filling factors of the electron system. The resultant dependence of tau on filling factor turned out to be nontrivial. At the temperature 1.5 K tau reached its maximal value at the exact filling nu = 1 and decreased when nu was altered, yet this maximum vanished when the system was cooled down to 0.5 K. The fractional quantum Hall effect state at the filling of 2/3 was formed at the temperature of 0.5 K, and the development of this state was accompanied by the slowing of the nuclear spin relaxation. This observation suggests the enhancement of energy gap in the spin excitation spectrum of two-dimensional electrons at 2/3 state.

引用

页码：21 / 23

页数：3

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