A study of the relative strengths of spin-pseudospin phases in a strongly coupled double quantum well system

被引：0

作者：

Barnes, CHW ^{[1
]}

Davies, AG ^{[1
]}

Zolleis, KR ^{[1
]}

Simmons, MY ^{[1
]}

Ritchie, DA ^{[1
]}

机构：

[1] Univ Cambridge, Cavendish Lab, Semicond Phys Grp, Cambridge CB3 0HE, England

来源：

PHYSICA B-CONDENSED MATTER | 1998年 / 256卷

基金：

英国工程与自然科学研究理事会;

关键词：

bi-layer systems; quantum Hall effect; spin exchange;

D O I：

10.1016/S0921-4526(98)00542-0

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We perform an experimental and theoretical investigation of the rich phase diagram of quantum Hall paramagnetic and ferromagnetic ground states in a double quantum well (DQW) system, and investigate how the structure of this diagram results from the inter-play between spin and pseudospin exchange energies. We use a comparison with a DQW quantum Hall Hartree calculation to identify the nature of these different phases and assess the effect of exchange and correlation energies. We find that the strengths of different phases and the nature of crossings between them can be understood by the dependence of spin and pseudospin exchange energies on subband wave function delocalisation which we tune in the DQW system by a surface gate bias. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：130 / 135

页数：6

共 46 条

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