Biexciton spin states of diluted magnetic semiconductor quantum wells in high magnetic fields

被引：4
作者：
Mino, H
Takeyama, S
Adachi, S
Karczewski, G
Wojtowicz, T
Kossut, J
机构：
[1] Chiba Univ, Fac Sci, Dept Phys, Inage Ku, Chiba 2638522, Japan
[2] Hokkaido Univ, Grad Sch Engn, Kita Ku, Sapporo, Hokkaido 0608628, Japan
[3] Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland
来源：
PHYSICA B | 2001年 / 298卷 / 1-4期
关键词：
biexciton; spin; magnetic field; diluted magnetic semiconductor;
D O I：
10.1016/S0921-4526(01)00354-4
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
An exciton and a biexciton photoluminescence in (Cd,Mn)Te/CdTe/(Cd,Mg)Te asymmetric quantum wells were investigated under magnetic fields. A quantum beat between an exciton and a biexciton has been observed by a transient four-wave-mixing spectroscopy. The spin-energy structures have been clarified by spectra of the four-wave-mixing signals. We have observed decrease of the intensity ratio of a biexciton to an exciton on increasing magnetic field. The instability of the spin singlet biexciton state is determined by the inner effective magnetic field produced by the local Mn magnetic moments. (C) 2001 Elsevier Science B.V. All rights reserved.
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页码：421 / 425
页数：5
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