Anomalous periodicity of magnetic interference patterns in encapsulated graphene Josephson junctions
We investigate supercurrent interference patterns measured as a function of magnetic field in ballistic graphene Josephson junctions. At high doping, the expected Φ_{0}-periodic “Fraunhofer” pattern is observed, indicating a uniform current distribution. Close to the Dirac point, we find anomalous i...
| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2019-11-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.1.033084 |
| _version_ | 1797211680817545216 |
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| author | C. T. Ke A. W. Draelos A. Seredinski M. T. Wei H. Li M. Hernandez-Rivera K. Watanabe T. Taniguchi M. Yamamoto S. Tarucha Y. Bomze I. V. Borzenets F. Amet G. Finkelstein |
| author_facet | C. T. Ke A. W. Draelos A. Seredinski M. T. Wei H. Li M. Hernandez-Rivera K. Watanabe T. Taniguchi M. Yamamoto S. Tarucha Y. Bomze I. V. Borzenets F. Amet G. Finkelstein |
| author_sort | C. T. Ke |
| collection | DOAJ |
| description | We investigate supercurrent interference patterns measured as a function of magnetic field in ballistic graphene Josephson junctions. At high doping, the expected Φ_{0}-periodic “Fraunhofer” pattern is observed, indicating a uniform current distribution. Close to the Dirac point, we find anomalous interferences that are close to a 2Φ_{0} 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. |
| first_indexed | 2024-04-24T10:30:21Z |
| format | Article |
| id | doaj.art-824c54874c3a451cb5f0728dbb714c16 |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:30:21Z |
| publishDate | 2019-11-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-824c54874c3a451cb5f0728dbb714c162024-04-12T16:46:45ZengAmerican Physical SocietyPhysical Review Research2643-15642019-11-011303308410.1103/PhysRevResearch.1.033084Anomalous periodicity of magnetic interference patterns in encapsulated graphene Josephson junctionsC. T. KeA. W. DraelosA. SeredinskiM. T. WeiH. LiM. Hernandez-RiveraK. WatanabeT. TaniguchiM. YamamotoS. TaruchaY. BomzeI. V. BorzenetsF. AmetG. FinkelsteinWe investigate supercurrent interference patterns measured as a function of magnetic field in ballistic graphene Josephson junctions. At high doping, the expected Φ_{0}-periodic “Fraunhofer” pattern is observed, indicating a uniform current distribution. Close to the Dirac point, we find anomalous interferences that are close to a 2Φ_{0} 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.http://doi.org/10.1103/PhysRevResearch.1.033084 |
| spellingShingle | C. T. Ke A. W. Draelos A. Seredinski M. T. Wei H. Li M. Hernandez-Rivera K. Watanabe T. Taniguchi M. Yamamoto S. Tarucha Y. Bomze I. V. Borzenets F. Amet G. Finkelstein Anomalous periodicity of magnetic interference patterns in encapsulated graphene Josephson junctions Physical Review Research |
| title | Anomalous periodicity of magnetic interference patterns in encapsulated graphene Josephson junctions |
| title_full | Anomalous periodicity of magnetic interference patterns in encapsulated graphene Josephson junctions |
| title_fullStr | Anomalous periodicity of magnetic interference patterns in encapsulated graphene Josephson junctions |
| title_full_unstemmed | Anomalous periodicity of magnetic interference patterns in encapsulated graphene Josephson junctions |
| title_short | Anomalous periodicity of magnetic interference patterns in encapsulated graphene Josephson junctions |
| title_sort | anomalous periodicity of magnetic interference patterns in encapsulated graphene josephson junctions |
| url | http://doi.org/10.1103/PhysRevResearch.1.033084 |
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