Superradiant-like dynamics by electron shuttling on a nuclear-spin island
arXiv:2002.01219 · doi:10.1103/PhysRevB.103.155301
Abstract
We investigate superradiant-like dynamics of the nuclear-spin bath in a single-electron quantum dot, by considering electrons cyclically shuttling on/off an isotopically enriched `nuclear-spin island'. Assuming a uniform hyperfine interaction, we discuss in detail the nuclear spin evolution under shuttling and its relation to superradiance. We derive the minimum shuttling time which allows to escape the adiabatic spin evolution. Furthermore, we discuss slow/fast shuttling under the inhomogeneous field of a nearby micromagnet. Finally, by comparing our scheme to a model with stationary quantum dot, we stress the important role played by non-adiabatic shuttling in lifting the Coulomb blockade and thus establishing the superradiant-like behavior.
arXiv comment14 pages, 12 figures
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