Effects of valence band mixing on hole spin coherence via hole-nuclei hyperfine interaction in InAlAs quantum dots
Effects of valence band mixing on hole spin coherence via hole-nuclei hyperfine interaction in InAlAs quantum dots
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DOI：
10.1063/1.4807901
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发表时间：
2013-05
影响因子：
3.2
通讯作者：
R. Kaji;S. Ohno;T. Hozumi;S. Adachi
中科院分区：
文献类型：
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作者：
R. Kaji;S. Ohno;T. Hozumi;S. Adachi
研究了价带混合对自组装InAlAs量子点中空穴自旋相干性的影响。价带混合不仅在量子点发射中引起光学各向异性，还通过与晶格核的超精细相互作用导致重空穴自旋退相。我们通过实验评估了多个In₀.₇₅Al₀.₂₅As/Al₀.₃Ga₀.₇As量子点的价带混合程度。价带混合的幅度与光致发光能量没有明显的依赖关系，在我们的样品中其小于0.25。尽管现阶段尚未通过实验方法进行直接测量，但通过计算详细讨论了价带混合对空穴自旋相干性的影响。
The effects of valence band mixing on the hole spin coherence in self-assembled InAlAs quantum dots are investigated. The valence band mixing induces not only optical anisotropy in the quantum dot emissions but also heavy hole spin dephasing via the hyperfine interaction with the lattice nuclei. We evaluated the degree of valence band mixing for a number of In0.75Al0.25As/Al0.3Ga0.7As quantum dots from experiments. The magnitude of valence band mixing does not show a clear dependence on the photoluminescence energy, and it is less than 0.25 in our sample. Although the direct measurement with experimental methods has not been carried out at this stage, the effect of valence band mixing on the hole spin coherence is discussed in detail by the calculations.