Temperature insensitive optical alignment of the exciton in nanowire embedded GaN Quantum Dots

Abstract

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.

arXiv comment13 pages, 5 figures

References in corpus (5)

• Spin orbit coupling in bulk ZnO and GaN
• Temperature dependence of polarization relaxation in semiconductor quantum dots
• Theory of excitons in cubic III-V semiconductor GaAs, InAs and GaN quantum dots: fine structure and spin relaxation
• Room temperature Optical Orientation of Exciton Spin in cubic GaN/AlN quantum dots
• Unique Electron Spin Relaxation Induced by Confined Phonons in Nanowire-Based Quantum Dots