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Supercurrent in a Double Quantum Dot

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We demonstrate the Josephson effect in a serial double quantum dot defined in a nanowire with epitaxial superconducting leads. The supercurrent stability diagram adopts a honeycomb pattern. We observe sharp discontinuities in the magnitude of the critical current, $I_c$, as a function of dot occupation, related to doublet to singlet ground state transitions. Detuning of the energy levels offers a tuning knob for $I_c$, which attains a maximum at zero detuning. The consistency between experiment and theory indicates that our device is a faithful realization of the two-impurity Anderson model.
OriginalsprogEngelsk
Artikelnummer112010
TidsskriftPhysical Review Letters
Vol/bind121
Udgave nummer25
Antal sider6
ISSN0031-9007
DOI
StatusUdgivet - 20 dec. 2018

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