Characterization of the nitrogen split interstitial defect in wurtzite   aluminum nitride using density functional theory
  We carried out Heyd-Scuseria-Ernzerhof hybrid density functional theory plane wave supercell calculations in wurtzite aluminum nitride in order to characterize the geometry, formation energies, transition levels and hyperfine tensors of the nitrogen split interstitial defect. The calculated hyperfine tensors may provide useful fingerprint of this defect for electron paramagnetic resonance measurement. 
A. Sz\'all\'as, K. Sz\'asz, X. T. Trinh, N. T. Son, E. Janz\'en and A.   Gali
cond-mat.mtrl-sci