Isotope sensitive measurement of the hole-nuclear spin interaction in quantum dots

Details Isotope sensitive measurement of the hole-nuclear spin interaction in quantum dots Isotope sensitive measurement of the hole-nuclear spin interaction in quantum dots

2011-09-04

arxiv.org/abs/1109.0733v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

Decoherence caused by the hyperfine interaction with nuclear spins is known to be the main obstacle on the way to realization of quantum computation using single electron spins, which led to proposals to use valence band holes having a weaker hyperfine coupling. Although the hole hyperfine interaction has been addressed recently both theoretically and experimentally, full understanding of the the underlying physics is still lacking. Here we report on experimental measurements of the hole hyperfine interaction strength in three different material systems: unstrained GaAs/AlGaAs quantum dots (QDs), and self-assembled InGaAs/GaAs and InP/GaInP QDs. In contrast to previous studies we use resonant radio frequency (rf) excitation to achieve selective measurement of the hole hyperfine constant for individual isotopes. This allows to avoid the ambiguity of previous measurements relying on detection of the total Overhauser shifts including contributions of all isotopes. We find that the hole hyperfine constant (normalized by the electron hyperfine constant) changes sign for different isotopes and ranges from -15% for indium to +15% for arsenic, revealing strong anisotropy of the dipole-dipole hyperfine interaction. Moreover, the hole hyperfine constant varies for the same isotope in different materials opening the way for better understanding and possible optimization of the hyperfine interaction for applications using single hole spins.

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