Transient behavior of the excitonic magnetic polarons in Cd1-xMnxTe epilayers

被引：4

作者：

Pittini, R ^{[1
]}

Shen, JX

Debnath, MC

Souma, I

Takahashi, M

Oka, Y

机构：

[1] Tohoku Univ, Sci Measurements Res Inst, Sendai, Miyagi 980, Japan

[2] JST, CREST, Kawaguchi, Saitama 332, Japan

来源：

JOURNAL OF APPLIED PHYSICS | 2000年 / 87卷 / 09期

关键词：

D O I：

10.1063/1.372736

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We present a study of the dynamics of the excitonic magnetic polarons in Cd1-xMnxTe epilayers. The transient photoluminescence measured by a streak camera under resonant excitation is analyzed with a special attention devoted to line shape of the emission signal. A nonradiative spectral region is observed in zero field and is strongly suppressed in a field of 6 T. This observation is understood to be directly related to the alignment of the Mn2+ spins and is therefore closely related to the formation of magnetic polarons. A few Mn spins are found to be aligned already within 10 ps, but the total Mn spin polarization in the sample is found to increase exponentially with a rise time of 37 ps in Cd0.73Mn0.27Te epilayers. Furthermore, the values of 19.2 and 12.4 meV were determined for the energies of the excitonic magnetic polarons in Cd0.73Mn0.27Te and Cd0.79Mn0.21Te epilayers, respectively. (C) 2000 American Institute of Physics. [S0021-8979(00)19508-8].

引用

页码：6454 / 6456

页数：3

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