Hyperfine coupling of hole and nuclear spins in symmetric GaAs quantum dots

Abstract

In self assembled III-V semiconductor quantum dots, valence holes have longer spin coherence times than the conduction electrons, due to their weaker coupling to nuclear spin bath fluctuations. Prolonging hole spin stability relies on a better understanding of the hole to nuclear spin hyperfine coupling which we address both in experiment and theory in the symmetric (111) GaAs/AlGaAs droplet dots. In magnetic fields applied along the growth axis, we create a strong nuclear spin polarization detected through the positively charged trion X${}^{+}$ Zeeman and Overhauser splittings. The observation of four clearly resolved photoluminescence lines - a unique property of the (111) nanosystems - allows us to measure separately the electron and hole contribution to the Overhauser shift. The hyperfine interaction for holes is found to be about five times weaker than that for electrons. Our theory shows that this ratio depends not only on intrinsic material properties but also on the dot shape and carrier confinement through the heavy-hole mixing, an opportunity for engineering the hole-nuclear spin interaction by tuning dot size and shape.

arXiv comment4 pages, 2 figures, supplement

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• Quantum model for mode locking in pulsed semiconductor quantum dots
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• Hole spin-flip transitions in a self-assembled quantum dot
• Optical spin control and coherence properties of acceptor bound holes in strained GaAs
• Electrically tunable dynamic nuclear spin polarization in GaAs quantum dots at zero magnetic field
• Photodriven germanium hole qubit
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• Nuclear spin polaron-formation: anisotropy effects and quantum phase transition
• Hyperfine interaction in atomically thin transition metal dichalcogenides