Excitonic magnetic polaron dynamics of MBE grown CdTe/Cd1 − xMnxTe, Cd1 − xMnxTe/Cd1 − vMgyTe single quantum wells in magneti fields
Excitonic magnetic polaron dynamics of MBE grown CdTe/Cd1 − xMnxTe, Cd1 − xMnxTe/Cd1 − vMgyTe single quantum wells in magneti fields
复制标题
磁场中MBE生长的CdTe/Cd1−xMnxTe、Cd1−xMnxTe/Cd1−vMgyTe单量子阱的激子磁极化子动力学
DOI：
10.1006/spmi.1998.0663
复制
发表时间：
1999
影响因子：
3.1
通讯作者：
Y. Oka
中科院分区：
文献类型：
--
作者：
M. Debnath;I. Souma;E. Shirado;T. Satō;J. Shen;Y. Oka
研究了不同阱宽和Mn、Mg组分的Cd 1 − xMnUe 2 Te、Cd 1 − xMgxTe外延层和CdTe/Cd 1 − xMnxTe、Cd 1 − xMnxTe/Cd 1 − vMgyTe单量子威尔斯中激子的寿命。激子的寿命被发现，通过施加外部磁场与巨大的塞曼分裂的样品急剧减少。所观察到的现象被解释在PL衰减时间的贡献，从长寿命的暗激子，可以转换为激子的自旋翻转过程的重组。我们把寿命的减少归因于暗激子的耗尽，因为它们跨越了磁场中偶极允许跃迁的激子能量。
Abstract Excitonic lifetimes in Cd1 − xMnUe2Te, Cd1 − xMgxTe epilayers and CdTe/Cd1 − xMnxTe, Cd1 − xMnxTe/Cd1 − vMgyTe single quantum wells with different well widths and Mn, Mg compositions are investigated. The excitonic lifetimes are found to reduce drastically by applying external magnetic fields to samples with giant Zeeman splittings. The observed phenomenon is interpreted in terms of the PL decay time contribution from the long-life dark excitons which can convert to excitons for recombinations by a spin-flip process. We attribute the lifetime reduction to the depletion of dark excitons due to their crossing over the exciton energies for dipole allowed transitions in magnetic fields.