Anomalous periodicity of magnetic interference patterns in encapsulated graphene Josephson junctions
Abstract
We investigate supercurrent interference patterns measured as a function of magnetic field in ballistic graphene Josephson junctions. At high doping, the expected -periodic “Fraunhofer” pattern is observed, indicating a uniform current distribution. Close to the Dirac point, we find anomalous interferences that are close to a 2 periodicity, similar to that predicted for topological Andreev bound states carrying a charge of e instead of 2e . This feature persists with increasing temperature, ruling out a nonsinusoidal current-phase relationship. It also persists in junctions in which sharp vacuum edges are eliminated. Our results indicate that the observed behavior may originate from an intrinsic property of ballistic graphene Josephson junctions, though the exact mechanism remains unclear.
- Publication Date:
- Research Org.:
- Duke Univ., Durham, NC (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); US Army Research Office (ARO); KAKENHI; Hong Kong Research Grants Council (ECS)
- OSTI Identifier:
- 1573431
- Alternate Identifier(s):
- OSTI ID: 1737511
- Grant/Contract Number:
- SC0002765; ECCS-1542015; 38000131; 17H01138
- Resource Type:
- Published Article
- Journal Name:
- Physical Review Research
- Additional Journal Information:
- Journal Name: Physical Review Research Journal Volume: 1 Journal Issue: 3; Journal ID: ISSN 2643-1564
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Graphene; Josephson junctions
Citation Formats
Ke, C. T., Draelos, A. W., Seredinski, A., Wei, M. T., Li, H., Hernandez-Rivera, M., Watanabe, K., Taniguchi, T., Yamamoto, M., Tarucha, S., Bomze, Y., Borzenets, I. V., Amet, F., and Finkelstein, G. Anomalous periodicity of magnetic interference patterns in encapsulated graphene Josephson junctions. United States: N. p., 2019.
Web. doi:10.1103/PhysRevResearch.1.033084.
Ke, C. T., Draelos, A. W., Seredinski, A., Wei, M. T., Li, H., Hernandez-Rivera, M., Watanabe, K., Taniguchi, T., Yamamoto, M., Tarucha, S., Bomze, Y., Borzenets, I. V., Amet, F., & Finkelstein, G. Anomalous periodicity of magnetic interference patterns in encapsulated graphene Josephson junctions. United States. https://doi.org/10.1103/PhysRevResearch.1.033084
Ke, C. T., Draelos, A. W., Seredinski, A., Wei, M. T., Li, H., Hernandez-Rivera, M., Watanabe, K., Taniguchi, T., Yamamoto, M., Tarucha, S., Bomze, Y., Borzenets, I. V., Amet, F., and Finkelstein, G. Thu .
"Anomalous periodicity of magnetic interference patterns in encapsulated graphene Josephson junctions". United States. https://doi.org/10.1103/PhysRevResearch.1.033084.
@article{osti_1573431,
title = {Anomalous periodicity of magnetic interference patterns in encapsulated graphene Josephson junctions},
author = {Ke, C. T. and Draelos, A. W. and Seredinski, A. and Wei, M. T. and Li, H. and Hernandez-Rivera, M. and Watanabe, K. and Taniguchi, T. and Yamamoto, M. and Tarucha, S. and Bomze, Y. and Borzenets, I. V. and Amet, F. and Finkelstein, G.},
abstractNote = {We investigate supercurrent interference patterns measured as a function of magnetic field in ballistic graphene Josephson junctions. At high doping, the expected Φ0 -periodic “Fraunhofer” pattern is observed, indicating a uniform current distribution. Close to the Dirac point, we find anomalous interferences that are close to a 2Φ0 periodicity, similar to that predicted for topological Andreev bound states carrying a charge of e instead of 2e . This feature persists with increasing temperature, ruling out a nonsinusoidal current-phase relationship. It also persists in junctions in which sharp vacuum edges are eliminated. Our results indicate that the observed behavior may originate from an intrinsic property of ballistic graphene Josephson junctions, though the exact mechanism remains unclear.},
doi = {10.1103/PhysRevResearch.1.033084},
journal = {Physical Review Research},
number = 3,
volume = 1,
place = {United States},
year = {2019},
month = {11}
}
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