Ab initio Calculation of optical properties of II-VI semiconductor surfaces

In this work we present some {\it ab initio} calculations of reflectance anisotropy spectra (RAS) of VI-II semiconductor surfaces having different surface reconstructions. We use an $ab$ $initio$ pseudopotential formalism in the framework of the density functional theory and within the local density approximation (DFT-LDA). We study the (001) polar surface of cadmium telluride (CdTe) and zinc telluride ZnTe with differents reconstructions. Also we obtain RAS using a microscopic formulation based on a semi-empirical tight binding (SETB) approach which includes spin-orbit (SO) interactions [1]. We show RAS of each surface reconstruction and compare both theoretical results with experimental results [2]. We find a good agreement between experimental and theoretical spectra. \\[3pt] [1] R.A. V\'azquez-Nava, B.S. Mendoza and C. Castillo, Phys. Rev. B {\bf 70}, 165306 (2004). \\[0pt] [2] R. E. Balderas-Navarro, K. Hingerl, W. Hilber, D. Stifter, A. Bonanni and H. Sitter, J. Vac. Sci. Technol. B {\bf 18}, 2224 (2000).