Abstract
The temperature-dependent electron spin relaxation of positively charged excitons in a single InAs quantum dot 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) at T < 50 K, spin relaxation depends on the dynamical nuclear spin polarization and is approximately temperature-independent, as predicted by Merkulov et al. [Phys. Rev. B 65, 205309 (2002)] (ii) T > about 50 K, spin relaxation speeds up with increasing temperature. A model of a two longitudinal optical phonon scattering process coupled with hyperfine interaction is proposed to account for the accelerated electron spin relaxation at higher temperatures.
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