FEMTOSECOND SPIN-POLARIZATION SPECTROSCOPY IN DILUTED-MAGNETIC-SEMICONDUCTOR QUANTUM-WELLS

被引：68
|
作者：
FREEMAN, MR
AWSCHALOM, DD
HONG, JM
CHANG, LL
机构：
来源：
PHYSICAL REVIEW LETTERS | 1990年 / 64卷 / 20期
关键词：
D O I：
10.1103/PhysRevLett.64.2430
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Charge-carrier spin scattering in diluted-magnetic-semiconductor multiple quantum wells is directly observed through the circular polarization of luminescence in a femtosecond time-resolved measurement. This represents a new short-time regime for direct spin-relaxation studies. Separate observations of electron and hole relaxation are accomplished by varying the applied magnetic field. Surprisingly, the spin-flip scattering rates in these systems appear to be independent of the extremely strong spin-spin exchange interaction between the charge carriers and the magnetic ions. © 1990 The American Physical Society.
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页码：2430 / 2433
页数：4
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