Temperature insensitive optical alignment of the exciton in nanowire   embedded GaN Quantum Dots
  We report on the exciton spin dynamics of nanowire embedded GaN/AlN Quantum Dots (QDs) investigated by time-resolved photoluminescence spectroscopy. Under a linearly polarized quasiresonant excitation we evidence the quenching of the exciton spin relaxation and a temperature insensitive degree of the exciton linear polarization, demonstrating the robustness of the optical alignment of the exciton spin in these nanowire embedded QDs. A detailed examination of the luminescence polarization angular dependence shows orthogonal linear exciton eigenstates with no preferential crystallographic orientation. 
A. Balocchi, J. Renard, C. T. Nguyen, B. Gayral, T. Amand, H.   Mariette, B. Daudin, G. Tourbot, and X. Marie
cond-mat.mtrl-sci