Electronic and optical properties of group IV two-dimensional materials

• Published in: Physica status solidi. A, Applications and materials science Applications and materials science, 2010-02, Vol.207 (2), p.291-299
• Main Authors: Pulci, O., Gori, P., Marsili, M., Garbuio, V., Seitsonen, A. P., Bechstedt, F., Cricenti, A., Del Sole, R.
• Format: Article
• Language: English
• Subjects: 71.15.Mb; 71.15.Qe; 71.15.−m; 71.20.−b; 78.20.Bh; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Electron states and collective excitations in thin films, multilayers, quantum wells, mesoscopic and nanoscale systems; Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures; Electronic structure of nanoscale materials : clusters, nanoparticles, nanotubes, and nanocrystals; Exact sciences and technology; Physics
• ISSN: 1862-6300; 1862-6319
• DOI: 10.1002/pssa.200982503

The microscopic study of complex systems has reached a high level of accuracy that allows for a deep understanding of their structure, electronic properties, and optical spectra. The theoretical investigation of surfaces is nowadays routinely done within density functional theory, for ground state properties, and, with a larger computational load, within many‐body perturbation theory, for excited states properties. In this paper we present and discuss examples of calculations for group IV two‐dimensional systems such as a clean silicon surface, a tin–germanium interface, graphene, and graphane, pointing out the importance of a pertinent treatment of many‐body effects.