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

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arxiv 1008.4604 v1 pith:5YZML2ON submitted 2010-08-26 cond-mat.mes-hall

E. A. Chekhovich , A. B. Krysa , M. S. Skolnick , A. I. Tartakovskii This is my paper · ORCID
classification cond-mat.mes-hall
keywords spininteractiondotshole-nuclearholehyperfinenucleiquantum
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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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