Phase-dependent microwave response of a graphene Josephson junction
Abstract
Gate-tunable Josephson junctions embedded in a microwave environment provide a promising platform to in situ engineer and optimize novel superconducting quantum circuits. The key quantity for the circuit design is the phase-dependent complex admittance of the junction, which can be probed by sensing a radio frequency SQUID with a tank circuit. Here, we investigate a graphene-based Josephson junction as a prototype gate-tunable element enclosed in a SQUID loop that is inductively coupled to a superconducting resonator operating at 3 GHz. With a concise circuit model that describes the dispersive and dissipative response of the coupled system, we extract the phase-dependent junction admittance corrected for self-screening of the SQUID loop. We decompose the admittance into the current-phase relation and the phase-dependent loss, and as these quantities are dictated by the spectrum and population dynamics of the supercurrent-carrying Andreev bound states, we gain insight to the underlying microscopic transport mechanisms in the junction. We theoretically reproduce the experimental results by considering a short, diffusive junction model that takes into account the interaction between the Andreev spectrum and the electromagnetic environment, from which we estimate lifetimes on the order of ∼10 ps for nonequilibrium populations.
Main Authors
Format
Articles
Research article
Published
2022
Series
Subjects
Publication in research information system
Publisher
American Physical Society (APS)
The permanent address of the publication
https://urn.fi/URN:NBN:fi:jyu-202206213536Use this for linking
Review status
Peer reviewed
ISSN
2643-1564
DOI
https://doi.org/10.1103/PhysRevResearch.4.013198
Language
English
Published in
Physical Review Research
Citation
- Haller, R., Fülöp, G., Indolese, D., Ridderbos, J., Kraft, R., Cheung, L. Y., Ungerer, J. H., Watanabe, K., Taniguchi, T., Beckmann, D., Danneau, R., Virtanen, P., & Schönenberger, C. (2022). Phase-dependent microwave response of a graphene Josephson junction. Physical Review Research, 4(1), Article 013198. https://doi.org/10.1103/PhysRevResearch.4.013198
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Funder(s)
European Commission
Research Council of Finland
Funding program(s)
FET Future and Emerging Technologies, H2020
Academy Project, AoF
FET Future and Emerging Technologies, H2020
Akatemiahanke, SA
Funded by the European Union. Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Education and Culture Executive Agency (EACEA). Neither the European Union nor EACEA can be held responsible for them.
Additional information about funding
This research was supported by the Swiss National Science Foundation through (a) Grants No. 172638 and No. 192027, (b) the National Centre of Competence in Research Quantum Science and Technology (QSIT), and (c) the QuantEra project SuperTop; the János Bolyai Research Scholarship of the Hungarian Academy of Sciences, the National Research Development and Innovation Office (NKFIH) through the OTKA Grants No. FK 132146 and No. NN127903 (FlagERA Topograph), and the National Research, Development and Innovation Fund of Hungary within the Quantum Technology National Excellence Program (Project No. 2017-1.2.1-NKP-2017-00001), the Quantum Information National Laboratory of Hungary and the ÚNKP-20-5 New National Excellence Program. We further acknowledge funding from the European Unions Horizon 2020 research and innovation programme, specifically (a) from the European Research Council (ERC) Grant Agreement No. 787414, ERC-Adv TopSupra, and (b) Grant Agreement No. 828948, FET-open project AndQC. This work was partly supported by Helmholtz society through program STN and the DFG via the projects DA 1280/3-1, DA 1280/7-1, and BE 4422/4-1. K. Watanabe and T. Taniguchi acknowledge support from the Elemental Strategy Initiative conducted by the MEXT, Japan, Grant No. JPMXP0112101001, JSPS KAKENHI Grant No. JP20H00354 and the CREST(JPMJCR15F3), JST and P. Virtanen acknowledges support from Academy of Finland Project 317118 and the European Union's Horizon 2020 Research and Innovation Framework Programme under Grant No. 800923 (SUPERTED).
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