  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.
