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Josephson ϕ0-junction in nanowire quantum dots

Abstract : The Josephson effect describes supercurrent flowing through a junction connecting two superconducting leads by a thin barrier 1 . This current is driven by a superconducting phase difference φ between the leads. In the presence of chiral and time-reversal symmetry of the Cooper pair tunnelling process 2 , the current is strictly zero when φ vanishes. Only if these underlying symmetries are broken can the supercurrent for φ = 0 be finite 3–5 . This corresponds to a ground state of the junction being offset by a phase φ 0 , different from 0 or π . Here, we report such a Josephson φ 0 -junction based on a nanowire quantum dot. We use a quantum interferometer device to investigate phase offsets and demonstrate that φ 0 can be controlled by electrostatic gating. Our results may have far-reaching implications for superconducting flux- and phase-defined quantum bits as well as for exploring topological superconductivity in quantum dot systems.
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https://hal.laas.fr/hal-01713069
Contributor : Sébastien Plissard <>
Submitted on : Tuesday, February 20, 2018 - 10:37:46 AM
Last modification on : Thursday, June 10, 2021 - 3:01:19 AM

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D. Szombati, S. Nadj-Perge, Diane Car, S.R. Plissard, E. Bakkers, et al.. Josephson ϕ0-junction in nanowire quantum dots. Nature Physics, Nature Publishing Group, 2016, 12 (6), pp.568 - 572. ⟨10.1038/nphys3742⟩. ⟨hal-01713069⟩

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