Spin-selective excitation spectroscopy of excitons and biexcitons in InxGa1-xAs quantum disks:: Suppression of the spin-flip process in semiconductor zero-dimensional systems

被引:19
作者
Kamada, H
Gotoh, H
Ando, H
Temmyo, J
Tamamura, T
机构
[1] Nippon Telegraph & Tel Corp, Basic Res Labs, Atsugi, Kanagawa 2430198, Japan
[2] Nippon Telegraph & Tel Corp, Optoelect Labs, Atsugi, Kanagawa 2430198, Japan
关键词
D O I
10.1103/PhysRevB.60.5791
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The spin relaxation of photocreated excitons in InxGa1-xAs/Al(y)Ga(1-y)AS quantum disks is investigated by microscope photoluminescence experiments under spin-selective optical excitation. Complete quantization of the two-dimensional energy structure of the quantum well into comb-shaped density of states results in inhibition of the elastic spin-flip processes, allowing only a simultaneous exchange of energy and momentum for spin relaxation. This slows down the spin flip in both the thermalization and recombination of exciton and substantially increases the spin-relaxation time. For some exciton excited states, the spin-flip relaxation into another spin state is efficient, thereby allowing the second photon absorption into a biexciton state even under the selective-spin excitation. [S0163-1829(99)00732-8].
引用
收藏
页码:5791 / 5796
页数:6
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