Symmetry-induced anisotropy of two-photon absorption spectra in zinc-blende semiconductors
Symmetry-induced anisotropy of two-photon absorption spectra in zinc-blende semiconductors
复制标题
闪锌矿半导体中双光子吸收光谱的对称性诱导各向异性
DOI：
10.1103/physrevb.55.9628
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
T. Nakayama
中科院分区：
文献类型：
--
作者：
M. Murayama;T. Nakayama
利用局部密度近似下的从头算全带结构和微观响应理论，计算了各种锌-闪锌矿化合物半导体简并双光子吸收光谱的各向异性。本文注意到e1吸收区的各向异性，并根据从头计算结果讨论了各向异性的成因。e1吸收区的各向异性大小几乎是恒定的（~ 0.5），这与e0吸收区的各向异性表现出强烈的材料依赖性有很大的不同。通过k⋅p摄动法定性分析，解释了这种各向异性行为的发生是由于波函数对称，即由于在布里渊区发生双光子跃迁的位置。
The anisotropy of degenerate two-photon absorption spectra is calculated for various zinc-blende compound semiconductors by using ab initio full band structures in the local-density approximation and the microscopic response theory. Anisotropy in the E 1 absorption region is noted in the present paper, the origin of which is discussed based on the ab initio calculational results. The anisotropy magnitude in the E 1 absorption region has a nearly constant value (∼ 0.5) hardly depending on material kinds, which is quite different from the case in the E 0 absorption region where the anisotropy shows the strong material dependence. By a qualitative analysis using the k⋅ p perturbation method, this behavior of anisotropy is explained to occur due to the wave-function symmetry, ie, due to where in the Brillouin zone the two-photon transitions occur.