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arXiv · 0704.3684

Dynamics of Quantum Dot Nuclear Spin Polarization Controlled by a Single Electron

P. Maletinsky·A. Badolato·A. Imamoglu
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Abstract

We present an experimental study of the dynamics underlying the buildup and decay of dynamical nuclear spin polarization in a single semiconductor quantum dot. Our experiment shows that the nuclei can be polarized on a time scale of a few milliseconds, while their decay dynamics depends drastically on external parameters. We show that a single electron can very efficiently depolarize the nuclear spins and discuss two processes that can cause this depolarization. Conversely, in the absence of a quantum dot electron, the lifetime of nuclear spin polarization is on the time scale of a second, most likely limited by the non-secular terms of the nuclear dipole-dipole interaction. We can further suppress this depolarization rate by 1-2 orders of magnitude by applying an external magnetic field exceeding 1 mT.

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P. Maletinsky, A. Badolato, A. Imamoglu. 2007-04-27. Dynamics of Quantum Dot Nuclear Spin Polarization Controlled by a Single Electron. https://doi.org/10.1103/physrevlett.99.056804

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