Observation of extremely slow hole spin relaxation in self-assembled quantum dots
By D. Heiss, S. Schaeck, H. Huebl, Martin Bichler, G. Abstreiter, J. J. F. D. V. Bulaev, Daniel Loss Paul Scherrer Institut, T. U. Munchen, D. Physics, Astronomy and 1 more. 2007
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We report the measurement of extremely slow hole spin relaxation dynamics in small ensembles of self-assembled InGaAs quantum dots. Individual spin oriented holes are optically created in the lowest orbital state of each dot and read out after a defined storage time using spin memory devices. The resulting luminescence signal exhibits a pronounced polarization memory effect that vanishes for long storage times. The hole spin relaxation dynamics are measured as a function of external magnetic field and lattice temperature. We show that hole spin relaxation can occur over remarkably long time scales in strongly confined quantum dots (up to similar to 270 mu s), as predicted by recent theory. Our findings are supported by calculations that reproduce both the observed magnetic field and temperature dependencies. The results suggest that hole spin relaxation in strongly confined quantum dots is due to spin-orbit-mediated phonon scattering between Zeeman levels, in marked contrast to higher-dimensional nanostructures where it is limited by valence band mixing.
Subfields: Atomic and Molecular Physics, and Optics, Electrical and Electronic Engineering
View Paper: https://www.semanticscholar.org/paper/75895a865120003c7f6352f14fc0be4036603e5e
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In Atomic and Molecular Physics, and Optics
In Electrical and Electronic Engineering
Citations in the corpus
- Nuclear spin physics in quantum dots: an optical investigation (2012, background): “In QDs the hole spin is much more robust than in bulk or quantum well structures because of the discrete energy states (Flissikowski et al., 2003; Heiss et al., 2007; Laurent et al., 2005) and significant effects linked to the holenuclear spin interaction have been revealed.”
- Decoherence in solid-state qubits (2008, result): “This observation has also been confirmed experimentally [68], where the spin relaxation rate for heavy holes has shown to be comparable to that of electrons.”