Temperature dependence of polarization relaxation in semiconductor quantum dots

TL;DR

This paper investigates how temperature affects the polarization relaxation times in semiconductor quantum dots, showing that phonon interactions lead to relaxation times of tens of picoseconds at around 100K, aligning with experimental data.

Contribution

It provides a theoretical calculation of polarization decay times considering quasielastic phonon interactions, highlighting that the phonon bottleneck does not significantly hinder relaxation.

Findings

Decay times are on the order of tens of picoseconds at 100K.

Phonon bottleneck does not prevent relaxation.

Results agree with recent experimental observations.

Abstract

The decay time of the linear polarization degree of the luminescence in strongly confined semiconductor quantum dots with asymmetrical shape is calculated in the frame of second-order quasielastic interaction between quantum dot charge carriers and LO phonons. The phonon bottleneck does not prevent significantly the relaxation processes and the calculated decay times can be of the order of a few tens picoseconds at temperature $T \simeq 100$K, consistent with recent experiments by Paillard et al. [Phys. Rev. Lett. {\bf86}, 1634 (2001)].