Spectroscopy of excitonic Zeeman levels in single quantum dots

被引：4
|
作者：
Schaller, A [1 ]
Zrenner, A [1 ]
Abstreiter, G [1 ]
Bohm, G [1 ]
机构：
[1] Tech Univ Munich, Walter Schottky Inst, D-85748 Garching, Germany
来源：
PHYSICA E | 1998年 / 2卷 / 1-4期
关键词：
quantum dots; coupled quantum wells; Zeeman effect; g-factor;
D O I：
10.1016/S1386-9477(98)00124-6
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Fully confined excitons are investigated in natural quantum dots, which are formed by well-width fluctuations in GaAs/AlAs coupled quantum-well structures. In magnetooptic experiments a population inversion of the Zeeman split levels in the quantum dots is found under the condition of charge injection from the AlAs X-point state. This new phenomenon is explained in terms of spin thermalization in the intermediate indirect exciton state and subsequent tunnelling into the direct quantum-dot state. Population inversion is thereby caused by the associated sign reversal of the effective exciton g-factor. (C) 1998 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：609 / 613
页数：5
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