ELECTRONIC-STRUCTURE OF ZINCBLENDE ZNSE - THEORY AND EXPERIMENT

In this paper we present a comprehensive study of the tetrahedral semi conductor ZnSe crystallizing in the zincblende structure. The electron ic structure of ZnSe has been determined first using the ab initio sel f-consistent linear muffin-tin orbital method with a local-density for m of the exchange-correlation functional. Then it has been adjusted to reproduce the experimental energy positions of the Zn 3d bands and of the optical gap. The adjusted electronic structure, densities of stat es and interband optical properties are presented and compared with pr evious calculations. Good agreement with experimental photoemission an d bremsstrahlung isochromat measurements was found after including an energy-dependent lifetime broadening. We measured the reflectivity of ZnSe with high resolution from 4 to 30 eV and the high-energy region o f the spectra has been interpreted on the basis of the present calcula tion.