Microwave photoassisted dissipation and supercurrent of a phase-biased graphene-superconductor ring
Dou, Z., Wakamura, T., Virtanen, P., Wu, N.-J., Deblock, R., Autier-Laurent, S., Watanabe, K., Taniguchi, T., Guéron, S., Bouchiat, H., & Ferrier, M. (2021). Microwave photoassisted dissipation and supercurrent of a phase-biased graphene-superconductor ring. Physical Review Research, 3(3), Article L032009. https://doi.org/10.1103/PhysRevResearch.3.L032009
Published inPhysical Review Research
DisciplineNanoscience CenterNanoscience Center
© Authors, 2021
Irradiating normal-superconducting junctions with microwave photons produce spectacular effects, such as Shapiro steps and photoinduced modifications of the dc supercurrent. Moreover, microwave irradiation can also have other, hitherto unexplored consequences, such as a photoassisted dissipation which is phase dependent. Here we present a finite-frequency measurement of both the dissipation and the supercurrent of a phase-biased graphene-superconductor junction in response to microwave photons. We find that, while the supercurrent response is well described by existing theory, the dissipation exhibits unexpected effects which need new theoretical elucidation. Especially with high frequency photons, the dissipation is enhanced at phase zero, where it is minimum without irradiation. We attribute this enhancement to Andreev level transitions, made possible by microwave-induced nonequilibrium population of Andreev bound states. Our results demonstrate that dissipation is a more sensitive probe of microwave photons than is the supercurrent, and reveal the potential of measuring dissipation to improve superconducting photodetectors and investigate photoassisted physics in hybrid superconducting systems. ...
PublisherAmerican Physical Society (APS)
ISSN Search the Publication Forum2643-1564
Publication in research information system
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Additional information about fundingWe also acknowledge financial support from ERC Ballistop (ERC Grant No. 833350), Japan Society for the Promotion of Science (Grant No. 2017-684), LabEx PALM (Grant No. ANR-10-LABX-0039-PALM), and ANR JETS (Grant No. ANR-16-CE30-0029-01).
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