title: Many-body effects in the excitation spectrum of a defect in SiC.
abstract: We show that electron correlations control the photophysics of defects in SiC through both renormalization of the quasiparticle band structure and excitonic effects. We consider the carbon vacancy with two possible excitation channels that involve conduction and valence bands. Corrections to the Kohn-Sham ionization levels strongly depend on the defect charge state. Excitonic effects introduce a redshift of 0.23 eV. The analysis reassigns excitation mechanism at the thresholds in photoinduced paramagnetic resonance measurements [J. Dashdorj, J. Appl. Phys. 104, 113707 (2008)].
authors.affiliation: Nano-Bio Spectroscopy Group and ETSF Scientific Development Centre, Departamento Física de Materiales, Universidad del País Vasco, Centro de Física de Materiales CSIC-UPV/EHU-MPC and DIPC, Avenida Tolosa 72, E-20018 San Sebastián, Spain.
authors.forename: Michel
authors.initials: M
authors.lastname: Bockstedte
authors.forename: Andrea
authors.initials: A
authors.lastname: Marini
authors.forename: Oleg
authors.initials: O
authors.lastname: Pankratov
authors.forename: Angel
authors.initials: A
authors.lastname: Rubio