Phase-dependent microwave response of a graphene Josephson junction
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...
| Main Authors: | , , , , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2022-03-01
|
| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.4.013198 |
| _version_ | 1797210777975783424 |
|---|---|
| author | R. Haller G. Fülöp D. Indolese J. Ridderbos R. Kraft L. Y. Cheung J. H. Ungerer K. Watanabe T. Taniguchi D. Beckmann R. Danneau P. Virtanen C. Schönenberger |
| author_facet | R. Haller G. Fülöp D. Indolese J. Ridderbos R. Kraft L. Y. Cheung J. H. Ungerer K. Watanabe T. Taniguchi D. Beckmann R. Danneau P. Virtanen C. Schönenberger |
| author_sort | R. Haller |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-24T10:16:00Z |
| format | Article |
| id | doaj.art-464628e50fbe4ec5b6798b6ca4be98b6 |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:16:00Z |
| publishDate | 2022-03-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-464628e50fbe4ec5b6798b6ca4be98b62024-04-12T17:18:55ZengAmerican Physical SocietyPhysical Review Research2643-15642022-03-014101319810.1103/PhysRevResearch.4.013198Phase-dependent microwave response of a graphene Josephson junctionR. HallerG. FülöpD. IndoleseJ. RidderbosR. KraftL. Y. CheungJ. H. UngererK. WatanabeT. TaniguchiD. BeckmannR. DanneauP. VirtanenC. SchönenbergerGate-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.http://doi.org/10.1103/PhysRevResearch.4.013198 |
| spellingShingle | R. Haller G. Fülöp D. Indolese J. Ridderbos R. Kraft L. Y. Cheung J. H. Ungerer K. Watanabe T. Taniguchi D. Beckmann R. Danneau P. Virtanen C. Schönenberger Phase-dependent microwave response of a graphene Josephson junction Physical Review Research |
| title | Phase-dependent microwave response of a graphene Josephson junction |
| title_full | Phase-dependent microwave response of a graphene Josephson junction |
| title_fullStr | Phase-dependent microwave response of a graphene Josephson junction |
| title_full_unstemmed | Phase-dependent microwave response of a graphene Josephson junction |
| title_short | Phase-dependent microwave response of a graphene Josephson junction |
| title_sort | phase dependent microwave response of a graphene josephson junction |
| url | http://doi.org/10.1103/PhysRevResearch.4.013198 |
| work_keys_str_mv | AT rhaller phasedependentmicrowaveresponseofagraphenejosephsonjunction AT gfulop phasedependentmicrowaveresponseofagraphenejosephsonjunction AT dindolese phasedependentmicrowaveresponseofagraphenejosephsonjunction AT jridderbos phasedependentmicrowaveresponseofagraphenejosephsonjunction AT rkraft phasedependentmicrowaveresponseofagraphenejosephsonjunction AT lycheung phasedependentmicrowaveresponseofagraphenejosephsonjunction AT jhungerer phasedependentmicrowaveresponseofagraphenejosephsonjunction AT kwatanabe phasedependentmicrowaveresponseofagraphenejosephsonjunction AT ttaniguchi phasedependentmicrowaveresponseofagraphenejosephsonjunction AT dbeckmann phasedependentmicrowaveresponseofagraphenejosephsonjunction AT rdanneau phasedependentmicrowaveresponseofagraphenejosephsonjunction AT pvirtanen phasedependentmicrowaveresponseofagraphenejosephsonjunction AT cschonenberger phasedependentmicrowaveresponseofagraphenejosephsonjunction |