Spin-flip rate of excitonic magnetic polarons in Cd1−xMnxTe/Cd1−yMgyTe quantum wells
Spin-flip rate of excitonic magnetic polarons in Cd1−xMnxTe/Cd1−yMgyTe quantum wells
复制标题
Cd1−xMnxTe/Cd1−yMgyTe 量子阱中激子磁极化子的自旋翻转率
DOI：
10.1063/1.372737
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发表时间：
2000
影响因子：
3.2
通讯作者：
Y. Oka
中科院分区：
文献类型：
--
作者：
M. Debnath;Jinxi Shen;E. Shirado;I. Souma;T. Satō;R. Pittini;Y. Oka
通过时间分辨光致发光光谱研究了 Cd1−xMnxTe/Cd1−yMgyTe 单量子阱中激子的寿命。暗激子和亮激子之间的自旋翻转显着改变了激子寿命，导致光致发光强度发生两倍指数衰减。两个衰减时间的温度依赖性表明自旋翻转速率强烈依赖于激子磁极化子的形成。通过形成极化子，极化Mn离子的自旋势垒有效降低了从暗激子到亮激子的自旋翻转速率，从而显着延长了发光衰减时间。
The lifetime of excitons in Cd1−xMnxTe/Cd1−yMgyTe single quantum wells was investigated by time-resolved photoluminescence spectroscopy. Spin-flips between dark and bright excitons remarkably change the excitonic lifetime yielding a two-exponential decay in the photoluminescence intensity. The temperature dependence of the two decay times shows that the spin-flip rate depends strongly on the formation of excitonic magnetic polarons. By forming polarons, the spin-flip rate from dark excitons to bright excitons is reduced effectively by the spin- barriers of the polarized Mn ions, which extends significantly the luminescence decay time.