SPIN-SELECTIVE EXCITATION SPECTROSCOPY OF EXCITONS AND BIEXCITONS IN INXGA1-XAS QUANTUM DISKS : SUPPRESSION OF THE SPIN-FLIP PROCESS IN SEMICONDUCTOR ZERO-DIMENSIONAL SYSTEMS
SPIN-SELECTIVE EXCITATION SPECTROSCOPY OF EXCITONS AND BIEXCITONS IN INXGA1-XAS QUANTUM DISKS : SUPPRESSION OF THE SPIN-FLIP PROCESS IN SEMICONDUCTOR ZERO-DIMENSIONAL SYSTEMS
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INXGA1-XAS量子盘中激子和双激子的自旋选择性激发光谱:半导体零维系统中自旋翻转过程的抑制
DOI：
10.1103/physrevb.60.5791
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发表时间：
1999
影响因子：
3.7
通讯作者：
T. Tamamura
中科院分区：
文献类型：
--
作者：
H. Kamada;H. Gotoh;H. Ando;J. Temmyo;T. Tamamura
利用显微镜光致发光实验研究了in x Ga 1−x As /A l y Ga 1−y As量子盘中光生激子在自旋选择性光激发下的自旋弛豫。将量子阱的二维能量结构完全量子化为梳状态密度，抑制了弹性自旋翻转过程，只允许同时交换能量和动量以进行自旋弛豫。这减慢了激子热化和复合过程中的自旋翻转，大大增加了自旋弛豫时间。对于某些激子激发态，自旋翻转弛豫进入另一个自旋态是有效的，从而允许第二光子吸收进入双激子状态，即使在选择性自旋激发下。
The spin relaxation of photocreated excitons in In x Ga 1− x A s/A l 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.