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

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

2010-08-26

arxiv.org/abs/1008.4604v1

Phys. Rev. Lett 106, 027402 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

to be submitted to Phys Rev Lett

Scientific paper

10.1103/PhysRevLett.106.027402

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.

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