Nonadiabatic dynamics in strongly driven diffusive Josephson junctions
Basset, J., Kuzmanović, M., Virtanen, P., Heikkilä, T.T., Estève, J., Gabelli, J., Strunk, C., & Aprili, M. (2019). Nonadiabatic dynamics in strongly driven diffusive Josephson junctions. Physical Review Research, 1(3), Article 032009. https://doi.org/10.1103/PhysRevResearch.1.032009
Published inPhysical Review Research
© The Authors, 2019.
By measuring the Josephson emission of a diffusive superconductor–normal metal–superconductor (SNS) junction we access the harmonic content of the current-phase relation (CPR). We experimentally identify a nonadiabatic regime in which the CPR is modified by high frequency microwave irradiation. This observation is explained by the excitation of quasiparticles in the normal wire induced by the electromagnetic field. The distortion of the CPR originates from the phase-dependent out-of-equilibrium distribution function which is strongly affected by the ac response of the spectral supercurrent. For a phase difference approaching π, transitions across the minigap are dynamically favored, leading to a supercurrent reduction. This finding is supported by a comparison with the quasiclassical Green's function theory of superconductivity in diffusive SNS junctions under microwave irradiation.
PublisherAmerican Physical Society
Publication in research information system
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Related funder(s)Academy of Finland; European Commission
Funding program(s)Academy Project, AoF
The content of the publication reflects only the author’s view. The funder is not responsible for any use that may be made of the information it contains.
Additional information about fundingThis work has partially been funded by the EuropeanUnion’s Horizon 2020 research and innovation programmeunder Grant Agreement No. 800923, and the Academy ofFinland Grant No. 317118. C.S.
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