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Geometry and electronic band structure of surfaces: the case of Ge(111):Sn and C(111) |
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| Authors: | O Pulci M Marsili P Gori M Palummo A Cricenti F Bechstedt R Del Sole |
| Institution: | 1. European Theoretical Spectroscopy Facility (ETSF) and CNR-INFM, CNISM, Department of Physics, University of Rome ‘Tor Vergata’, Via della Ricerca Scientifica 1, 00133, Roma, Italy 2. CNR, Istituto di Struttura della Materia (ISM), Via del Fosso del Cavaliere 100, 00133, Roma, Italy 3. European Theoretical Spectroscopy Facility (ETSF) and IFTO, Friedrich Schiller Universit?t, Jena, Germany |
| Abstract: | We present an ab initio study of two semiconductor surfaces, the α phase of Sn on Ge(111) and the cleavage surface of diamond. The theoretical tools used (density functional theory (DFT) and many-body perturbation theory) are discussed in detail, and the advantages and disadvantages of the two approaches are pointed out. We show that in the case of diamond it is essential to go beyond the DFT single-particle approach, and to introduce quasiparticle effects through the GW approximation. PACS 73.20.-r; 73.20.At; 71.15.Mb |
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