The temperature-dependent electron spin relaxation of positively charged excitons in a single InAs quantum dot (QD) was measured by time-resolved photoluminescence spectroscopy at zero applied magnetic fields. The experimental results show that the electron-spin relaxation is clearly divided into two different temperature regimes: (i) T < 50 K, spin relaxation depends on the dynamical nuclear spin polarization (DNSP) and is approximately temperature-independent, as predicted by Merkulov et al. (ii) T > about 50 K, spin relaxation speeds up with increasing temperature. A model of two LO phonon scattering process coupled with hyperfine interaction is proposed to account for the accelerated electron spin relaxation at higher temperatures.
@article{arxiv.1201.1125,
title = {Temperature dependence of electron-spin relaxation in a single InAs quantum dot at zero applied magnetic field},
author = {X. M. Dou and B. Q. Sun and D. S. Jiang and H. Q. Ni and Z. C. Niu},
journal= {arXiv preprint arXiv:1201.1125},
year = {2015}
}