Direct Measurement of a sin(2φ) Current Phase Relation in a Graphene Superconducting Quantum Interference Device,Physical Review Letters

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Direct Measurement of a sin(2φ) Current Phase Relation in a Graphene Superconducting Quantum Interference Device
Physical Review Letters ( IF 8.1 ) Pub Date : 2024-09-05 , DOI: 10.1103/physrevlett.133.106001
Simon Messelot ₁ , Nicolas Aparicio ₁ , Elie de Seze ₁ , Eric Eyraud ₁ , Johann Coraux ₁ , Kenji Watanabe ₂ , Takashi Taniguchi ₂ , Julien Renard ₁

Affiliation

In a Josephson junction, the current phase relation relates the phase variation of the superconducting order parameter

φ

, between the two superconducting leads connected through a weak link, to the dissipationless current. This relation is the fingerprint of the junction. It is usually dominated by a

\sin (φ)

harmonic, however, its precise knowledge is necessary to design superconducting quantum circuits with tailored properties. Here, we directly measure the current phase relation of a superconducting quantum interference device made with gate-tunable graphene Josephson junctions and we show that it can behave as a