Temperature dependence of electron-spin relaxation in a single InAs quantum dot at zero applied magnetic field

Details Temperature dependence of electron-spin relaxation in a single InAs quantum dot at zero applied magnetic field Temperature dependence of electron-spin relaxation in a single InAs quantum dot at zero applied magnetic field

2012-01-05

arxiv.org/abs/1201.1125v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 4 figures

Scientific paper

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.

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