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Estrada Saldaña, J C; Vekris, A; Steffensen, G; Žitko, R; Krogstrup, P; Paaske, J; Grove-Rasmussen, K; Nygård, J
Physical review letters, 2018-Dec-21, Volume: 121, Issue: 25Journal Article
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.
