Measurements of a fast nuclear spin dynamics in a single InAs quantum dot with positively charged exciton

Details Measurements of a fast nuclear spin dynamics in a single InAs quantum dot with positively charged exciton Measurements of a fast nuclear spin dynamics in a single InAs quantum dot with positively charged exciton

2012-01-05

arxiv.org/abs/1201.1123v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures

Scientific paper

By using highly time-resolved spectroscopy with an alternative {\sigma}+/{\sigma} - laser pulse modulation technique, we are able to measure the fast buildup and decay times of the dynamical nuclear spin polarization (DNSP) at 5 K for a single InAs quantum dot (QD) with positively charged exciton. It is shown that the nuclear dipole-dipole interaction can efficiently depolarize DNSP with a typical time constant of 500 {\mu}s in the absence of external magnetic field. By using an external field of 8 mT to suppress the nuclear dipolar interaction, the decay time turns to be mainly induced by interaction with unpaired electron and extends to about 5 ms. In addition, it is found that the time constant of hole-induced depolarization of nuclear spin is about 112 ms.

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