Abstract
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 ${\mathrm{E}}_{1}$ 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 ${\mathrm{E}}_{1}$ absorption region has a nearly constant value (\ensuremath{\sim}0.5) hardly depending on material kinds, which is quite different from the case in the ${\mathrm{E}}_{0}$ absorption region where the anisotropy shows the strong material dependence. By a qualitative analysis using the k\ensuremath{\cdot}p perturbation method, this behavior of anisotropy is explained to occur due to the wave-function symmetry, i.e., due to where in the Brillouin zone the two-photon transitions occur.
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