Large-scale electronic structure calculations of vacancies in 4H-SiC   using the Heyd-Scuseria-Ernzerhof screened hybrid density functional
  Large-scale and gap error free calculations of the electronic structure of vacancies in 4H-SiC have been carried out using a hybrid density functional (HSE06) and an accurate charge correction scheme. Based on the results the carbon vacancy is proposed to be responsible for the Z1/2 and EH6/7 DLTS centers 
Tamas Hornos, Adam Gali and Bengt G. Svensson
cond-mat.mtrl-sci