Hole - Nuclear Spin Interaction in Quantum Dots

Details Hole - Nuclear Spin Interaction in Quantum Dots Hole - Nuclear Spin Interaction in Quantum Dots

2008-07-07

arxiv.org/abs/0807.0968v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

17 pages, 3 figures, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.102.146601

We have measured the carrier spin dynamics in p-doped InAs/GaAs quantum dots by pump-probe photo-induced circular dichroism and time-resolved photoluminescence experiments. We show that the hole spin dephasing is controlled by the hyperfine interaction between hole and nuclear spins. In the absence of external magnetic field, we find a characteristic hole spin dephasing time of 15 ns, in close agreement with our calculations based on dipole-dipole coupling between the hole and the quantum dot nuclei. Finally we demonstrate that a small external magnetic field, typically 10 mT instead of 200 mT for the case of electrons, quenches the hyperfine hole spin dephasing.

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