Direct measurement of the hole-nuclear spin interaction in single quantum dots

Abstract

We use photoluminescence spectroscopy of ''bright'' and ''dark'' exciton states in single InP/GaInP quantum dots to measure hyperfine interaction of the valence band hole with nuclear spins polarized along the sample growth axis. The ratio of the hyperfine constants for the hole (C) and electron (A) is found to be C/A~-0.11. In InP dots the contribution of spin 1/2 phosphorus nuclei to the hole-nuclear interaction is weak, which enables us to determine experimentally the value of C for spin 9/2 indium nuclei as C_In~-5 micro-eV. This high value of C is in good agreement with recent theoretical predictions and suggests that the hole-nuclear spin interaction has to be taken into account when considering spin qubits based on holes.

to be submitted to Phys Rev Lett

References in corpus (10)

• Quantum Computation with Quantum Dots
• Spins in few-electron quantum dots
• Electron spin decoherence in quantum dots due to interaction with nuclei
• Spin decoherence of a heavy hole coupled to nuclear spins in a quantum dot
• Observation of extremely slow hole spin relaxation in self-assembled quantum dots
• Hole - Nuclear Spin Interaction in Quantum Dots
• Hole spin dephasing time associated to hyperfine interaction in quantum dots
• Pumping of nuclear spins by the optical solid effect in a quantum dot
• Overhauser effect in individual InP/GaInP dots
• Polarization freezing of 10000 optically-cooled nuclear spins by coupling to a single electron

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