Hole - Nuclear Spin Interaction in Quantum Dots

Abstract

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.

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

References in corpus (12)

• Quantum Computation with Quantum Dots
• Spins in few-electron quantum dots
• Electron spin relaxation by nuclei in semiconductor quantum dots
• Electron spin decoherence in quantum dots due to interaction with nuclei
• Triplet-Singlet Spin Relaxation via Nuclei in a Double Quantum Dot
• Spin decoherence of a heavy hole coupled to nuclear spins in a quantum dot
• Spin relaxation and decoherence of holes in quantum dots
• Electron spin evolution induced by interaction with nuclei in a quantum dot
• Observation of extremely slow hole spin relaxation in self-assembled quantum dots
• Optical control of spin coherence in singly charged (In,Ga)As/GaAs quantum dots
• Dynamics of Quantum Dot Nuclear Spin Polarization Controlled by a Single Electron
• Effect of external magnetic field on electron spin dephasing induced by hyperfine interaction in quantum dots

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• Direct measurement of the hole-nuclear spin interaction in single quantum dots
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• Atomistic theory of spin relaxation in self-assembled In${}_{1-x}$Ga${}_x$As/GaAs quantum dots at zero magnetic field
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