Sixfold symmetry of excitonic transition energies in c-plane for wurtzite GaN

Abstract

The optical properties of the strained wurtzite GaN are investigated theoretically within the nearest neighbor tight-binding method. The piezoelectric effect is also taken into account. The empirical rule has been used in the strained band-structure calculation. The results show that the excitonic transition energies are anisotropic in the c -plane in a high electronic concentration system and have a 60°periodicity, which is in agreement with experiment. © 2008 American Institute of Physics.