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Band structure characterization of K8Ga8Si38 clathrates by optical measurement

We have investigated the band structure of K8Ga8Si38 clathrates by using optical reflectance measurements and first-principle calculations based on the density functional theory. The imaginary part of the dielectric function e2 was calculated from the normal reflectance spectrum via the Kramers-Kronig analysis. The experimental e2 values showed a fundamental absorption edge near 1 eV. From the analysis of the absorption spectrum, we found that the value of the absorption edge energy is approximately 1.2 eV for a K8Ga8Si38 clathrate crystal.