Electroreflectance and wavelength‐modulated reflectivity spectra of Zn1−xMnxSe alloys
Electroreflectance and wavelength‐modulated reflectivity spectra of Zn1−xMnxSe alloys
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Zn1−xMnxSe 合金的电反射率和波长调制反射率光谱
DOI：
10.1063/1.340817
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发表时间：
1988
影响因子：
3.2
通讯作者：
J. R. Fermin
中科院分区：
文献类型：
--
作者：
J. Stankiewicz;J. R. Fermin
在Zn1− xMnxSe单晶的整个组成范围内（0≤x≤0.57），获得了低场电反射（ER）和波长调制反射（WMR）谱。对ER数据的分析使我们能够确定基本能隙对温度（8 K≤T≤300 K）和Mn摩尔分数x的依赖性。在以纤锌矿结构结晶的x≥0.35的样品中，在WMR谱和一些ER谱中观察到两个或三个温度依赖性特征。我们将这些峰与六方晶系Zn1−x Mnx Se中不同价带的基态激子相鉴别。对于x=0.39，观察到的晶场分裂为1020 meV，并且随着Mn含量的增加而减小。
Low‐field electroreflectance (ER) and wavelength‐modulated reflectivity (WMR) spectra have been obtained on Zn1−x Mnx Se single crystals in the whole range of composition, 0≤x≤0.57. An analysis of the ER data enabled us to determine the dependence of the fundamental energy gap on temperature (8 K≤T≤300 K) and Mn molar fraction x. In samples with x≥0.35, which crystallize in a wurtzite structure, two or three temperature‐dependent features are observed in WMR spectra and in some ER spectra. We identify these peaks with the ground‐state excitons for different valence bands in hexagonal Zn1−x Mnx Se. The observed crystal‐field splitting is ∼20 meV for x=0.39 and decreases with increasing Mn content.