Spin transport dynamics of excitons in CdTe/Cd1−xMnxTe quantum wells
Spin transport dynamics of excitons in CdTe/Cd1−xMnxTe quantum wells
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CdTe/Cd1−xMnxTe 量子阱中激子的自旋输运动力学
DOI：
10.1063/1.1357850
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发表时间：
2001
影响因子：
3.2
通讯作者：
Y. Oka
中科院分区：
文献类型：
--
作者：
K. Kayanuma;E. Shirado;M. Debnath;I. Souma;Z. Chen;Y. Oka
研究了Cd0.95Mn0.05Te和CdTe阱组成的双量子阱系统中自旋极化激子的输运特性。磁场中时间分辨激子光致发光的圆偏振度表明，自旋极化激子从磁性量子阱中扩散出来，并通过自旋守恒注入到非磁性量子阱中。注入非磁性阱的自旋极化激子达到非磁性阱激子的18%。根据圆偏振度和磁量子阱激子的寿命，确定Cd0.95Mn0.05Te 阱中激子的自旋弛豫时间为275-10 ps，具体取决于磁场强度。
Transport properties of spin-polarized excitons were studied in the double quantum well system composed of Cd0.95Mn0.05Te and CdTe wells. Circular polarization degrees of the time resolved exciton photoluminescence in magnetic field showed that the spin-polarized excitons diffused from the magnetic quantum well and injected to the non-magnetic quantum well by conserving their spins. The spin-polarized excitons injected into the nonmagnetic well reaches 18% of the nonmagnetic well excitons. From the circular polarization degree and the lifetime of the magnetic quantum well excitons, the spin relaxation time of the excitons in the Cd0.95Mn0.05Te well was determined as 275–10 ps depending on the magnetic field strength.