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

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

2007-04-27

arxiv.org/abs/0704.3684v1

Phys. Rev. Lett. 99, 056804 (2007)

Physics

Optics

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.99.056804

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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