Enhancement of the interband Stark effects in strained CdxZn1−xTe/ZnTe coupled double quantum wells
Enhancement of the interband Stark effects in strained CdxZn1−xTe/ZnTe coupled double quantum wells
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DOI：
10.1063/1.122202
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发表时间：
1998-09
影响因子：
4
通讯作者：
Tae Whan Kim;K. H. Lee;H. Park
中科院分区：
文献类型：
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作者：
Tae Whan Kim;K. H. Lee;H. Park
从理论和实验上研究了电场对CdxZn 1 −xTe/ZnTe耦合双量子威尔斯阱带间跃迁的影响。利用光致发光（PL）技术研究了CdxZn 1 −xTe/ZnTe耦合双量子威尔斯阱中的激子跃迁.透射电子显微镜图像显示，35-A的Cd0.18Zn0.82Te量子阱和50-A的Cd0.18Zn0.82Te量子阱被35-A的Cd0.1Zn0.9Te势垒分开。在300 K的PL谱显示激子跃迁。当外加电场作用于耦合双量子阱时，CdxZn 1 −xTe/ZnTe耦合双量子阱威尔斯的带间跃迁能的Stark位移比Cd0.1Zn0.9Te/ZnTe单量子阱威尔斯的带间跃迁能的Stark位移对外加电场更为敏感.在考虑应变效应的包络函数近似下，计算了量子威尔斯阱中的电子子带能量和能量波函数。这些结果…
The effects of an electric field on the interband transitions in CdxZn1−xTe/ZnTe coupled double quantum wells have been investigated both experimentally and theoretically. Photoluminescence (PL) measurements have been performed to investigate the excitonic transitions in CdxZn1−xTe/ZnTe coupled double quantum wells. Transmission electron microscopy images show that a 35-A Cd0.18Zn0.82Te quantum well and a 50-A Cd0.18Zn0.82Te quantum well are separated by a 35-A Cd0.1Zn0.9Te potential barrier. PL spectra at 300 K show the excitonic transitions. When an electric field is applied to a coupled double quantum well, the Stark shift of the interband transition energy in the CdxZn1−xTe/ZnTe coupled double quantum wells is much more sensitive to the applied electric field than that of the Cd0.1Zn0.9Te/ZnTe single quantum wells. The electronic subband energies and energy wave functions in the quantum wells are calculated by an envelope function approximation, which takes into account the strain effects. These resul...