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• W3172319325 abstract "We study theoretically spin relaxation during phonon-assisted tunneling of a single electron in self-assembled InAs/GaAs quantum-dot molecules formed by vertically stacked dots. We find that the spin-flip tunneling rate may be as high as 1% of the spin-conserving one. By studying the dependence of spin relaxation rate on external fields, we show that the process is active at a considerable rate even without the magnetic field, and scales with the latter differently than the relaxation in a Zeeman doublet. Utilizing a multiband $boldsymbol{k}cdotboldsymbol{p}$ theory, we selectively investigate the impact of various spin-mixing terms in the electron energy and carrier-phonon interaction Hamiltonians. As a result, we identify the main contribution to come from the Dresselhaus spin-orbit interaction, which is responsible for the zero-field effect. At magnetic fields above $sim$ 15 T, this is surpassed by other contributions due to the structural shear strain. We also study the impact of the sample morphology and determine that the misalignment of the dots may enhance relaxation rate by over an order of magnitude. Finally, via virtual tunneling at nonzero temperature, the process in question also affects stationary electrons in tunnel-coupled structures and provides a Zeeman-doublet spin relaxation channel even without the magnetic field." @default.
• W3172319325 created "2021-06-22" @default.
• W3172319325 creator A5006034270 @default.
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• W3172319325 date "2021-06-16" @default.
• W3172319325 modified "2023-10-10" @default.
• W3172319325 title "Tunneling-related electron spin relaxation in self-assembled quantum-dot molecules" @default.
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• W3172319325 doi "https://doi.org/10.1103/physrevb.103.245422" @default.
• W3172319325 hasPublicationYear "2021" @default.
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