The atomic and electronic core structures of the c-edge basal dislocation in wurtzite were modelled within the framework of ab initio tight-binding methods. This dislocation was found to have 4 core configurations which displayed 5/8/5- or 4/8-atom ring structures. All of these configurations introduced unfilled deep states into the top half of the band-gap.

Ab initio Tight-Binding Study of the Core Structures of the c-Edge Dislocation in Wurtzite GaN. I.Belabbas, J.Chen, M.A.Belkhir, P.Ruterana, G.Nouet: Physica Status Solidi A, 2006, 203[9], 2167-71