The splitting patterns of point defect energy levels in wurtzite crystals under uni-axial stress were derived for stress applied along an arbitrary crystal direction. The non-symmorphic wurtzite crystal had a hexagonal point group C6v, while point defects in the crystal belong to one of either the trigonal (C3v and C3), monoclinic (C1h), or triclinic (C1) symmetry classes. Trigonal defects may possess both intrinsic and orientational degeneracies (apart from time-reversal degeneracy), while the monoclinic and triclinic defects possess only orientational degeneracy (again neglecting time-reversal degeneracy). The splitting patterns of the energy levels of defects belonging to these classes were derived for uni-axial stress along arbitrary directions and the contributions to the various stress-split components from the different inequivalent orientations were indicated. The results of the theoretical analyses were compared with a selection of experimental results from the literature and good agreement was found in all cases. The general equations provided here should prove to be very valuable for the interpretation of uni-axial stress data for all wurtzite crystals.

Splitting of Point Defect Energy Levels in Wurtzite Crystals Under Uniaxial Stresses Applied Along Arbitrary Directions. E.McGlynn, M.O.Henry: Physical Review B, 2007, 76[18], 184109 (11pp)