Room temperature Optical Orientation of Exciton Spin in cubic GaN/AlN quantum dots

TL;DR

This study demonstrates that exciton spin polarization in cubic GaN/AlN quantum dots remains robust at room temperature, with decay times exceeding 10 nanoseconds, indicating potential for spintronic applications.

Contribution

It provides the first evidence of long-lived exciton spin polarization at room temperature in cubic GaN/AlN quantum dots using time-resolved photoluminescence.

Findings

No temporal decay of luminescence linear polarization at room temperature

Exciton spin polarization decay times longer than 10 ns

Robustness of exciton spin polarization in cubic nitride nanostructures

Abstract

The optical orientation of the exciton spin in an ensemble of self-organized cubic GaN/AlN quantum dots is studied by time-resolved photoluminescence. Under a polarized quasi-resonant excitation, the luminescence linear polarization exhibits no temporal decay, even at room temperature. This demonstrates the robustness of the exciton spin polarization in these cubic nitride nanostructures, with characteristic decay times longer than 10 ns.