（Cd，Mn）Te/（Cd，Mn，Mg）Te量子阱中空穴磁极化子的光学取向
Optical orientation of hole magnetic polarons in (Cd,Mn)Te/(Cd,Mn,Mg)Te quantum wells
摘要：
利用皮秒抽运-探测克尔旋转效应研究了（Cd，Mn）Te/（Cd，Mn，Mg）Te稀磁半导体量子阱中的光致自旋极化。在1.8 K的温度下，除了振荡信号从光激发的电子和锰自旋进动约外部磁场，一个令人惊讶的长寿命（高达60 ns）非振荡自旋极化检测。这种极化与涉及常驻空穴的平衡磁极化子的光学取向有关。平衡磁极化子的光学取向的建议机制表明，检测到的极化子动力学起源于未激发的磁极化子。极化子自旋动力学由重空穴的各向异性自旋结构控制，导致极化子磁矩冻结在沿结构生长轴取向的两个稳定状态之一中。这些状态之间的自旋弛豫被势垒所禁止，势垒取决于温度和磁场。在磁场中，磁极化子的弛豫随温度的升高而加速。
英文摘要：
The optically induced spin polarization in (Cd,Mn)Te/(Cd,Mn,Mg)Te diluted-magnetic-semiconductor quantum wells is investigated by means of picosecond pump-probe Kerr rotation. At 1.8 K temperature, additionally to the oscillatory signals from photoexcited electrons and Manganese spins precessing about an external magnetic field, a surprisingly long-lived (up to 60 ns) nonoscillating spin polarization is detected. This polarization is related to optical orientation of equilibrium magnetic polarons involving resident holes. The suggested mechanism for the optical orientation of the equilibrium magnetic polarons indicates that the detected polaron dynamics originates from unexcited magnetic polarons. The polaron spin dynamics is controlled by the anisotropic spin structure of the heavy-hole resulting in a freezing of the polaron magnetic moment in one of the two stable states oriented along the structure growth axis. Spin relaxation between these states is prohibited by a potential barrier, which depends on temperature and magnetic field. The magnetic polaron relaxation is accelerated with increasing temperature and in magnetic field.
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