Spin dynamics in a diluted magnetic semiconductor quantum well studied by pump-probe absorption spectroscopy: Magnetic-field-induced suppression of electron-spin relaxation
Spin dynamics in a diluted magnetic semiconductor quantum well studied by pump-probe absorption spectroscopy: Magnetic-field-induced suppression of electron-spin relaxation
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DOI：
10.1063/1.2216111
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发表时间：
2006-06
影响因子：
4
通讯作者：
A. Murayama;K. Seo;K. Nishibayashi;I. Souma;Y. Oka
中科院分区：
文献类型：
--
作者：
A. Murayama;K. Seo;K. Nishibayashi;I. Souma;Y. Oka
利用泵浦-探测吸收光谱研究了磁场作用下稀磁半导体量子阱Cd_（0.95）Mn_（0.05）Te中激子的自旋动力学。高能量和低能量自旋态的重空穴（hh）激子的饱和吸收的时间依赖性澄清了以下的激子自旋弛豫过程中的磁场：超快的hh自旋弛豫与暗激子的形成和随后的电子自旋弛豫。由于涉及Mn自旋的s-d交换机制的电子自旋弛豫在高磁场中通过Mn自旋的场致钉扎被抑制。
Exciton spin dynamics is studied in a diluted magnetic semiconductor quantum well of Cd0.95Mn0.05Te by pump-probe absorption spectroscopy under magnetic fields. The time dependences of the saturated absorbance for the higher- and lower-energy spin states of heavy-hole (hh) excitons clarify the following exciton-spin relaxation process in magnetic fields: ultrafast hh-spin relaxation with the formation of dark excitons and subsequent electron-spin relaxation. The electron-spin relaxation due to the s-d exchange mechanism involving Mn spins is suppressed in a high magnetic field by field-induced pinning of the Mn spins.