Multiterminal Josephson Effect
We report a probable observation of the dc Josephson effect in mesoscopic junctions of three and four superconductors. The devices are fabricated in a top-down fashion from a hybrid semiconductor-superconductor InAs/Al epitaxial heterostructure. In general, the critical current of an N-terminal junc...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2020-09-01
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| Series: | Physical Review X |
| Online Access: | http://doi.org/10.1103/PhysRevX.10.031051 |
| _version_ | 1818840910838890496 |
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| author | Natalia Pankratova Hanho Lee Roman Kuzmin Kaushini Wickramasinghe William Mayer Joseph Yuan Maxim G. Vavilov Javad Shabani Vladimir E. Manucharyan |
| author_facet | Natalia Pankratova Hanho Lee Roman Kuzmin Kaushini Wickramasinghe William Mayer Joseph Yuan Maxim G. Vavilov Javad Shabani Vladimir E. Manucharyan |
| author_sort | Natalia Pankratova |
| collection | DOAJ |
| description | We report a probable observation of the dc Josephson effect in mesoscopic junctions of three and four superconductors. The devices are fabricated in a top-down fashion from a hybrid semiconductor-superconductor InAs/Al epitaxial heterostructure. In general, the critical current of an N-terminal junction is an (N-1)-dimensional hypersurface in the space of bias currents, which can be reduced to a set of critical current contours. The geometry of critical current contours exhibits nontrivial responses to electrical gating, magnetic field, and phase bias, and it can be reproduced by the scattering formulation of the Josephson effect generalized to the case of N>2. Besides establishing solid ground beneath a host of recent theory proposals, our experiment accomplishes an important step toward creating trijunctions of topological superconductors, essential for braiding operations. |
| first_indexed | 2024-12-19T04:17:42Z |
| format | Article |
| id | doaj.art-7f6f228d7fc1498c80ad7441fbf8dccb |
| institution | Directory Open Access Journal |
| issn | 2160-3308 |
| language | English |
| last_indexed | 2024-12-19T04:17:42Z |
| publishDate | 2020-09-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review X |
| spelling | doaj.art-7f6f228d7fc1498c80ad7441fbf8dccb2022-12-21T20:36:15ZengAmerican Physical SocietyPhysical Review X2160-33082020-09-0110303105110.1103/PhysRevX.10.031051Multiterminal Josephson EffectNatalia PankratovaHanho LeeRoman KuzminKaushini WickramasingheWilliam MayerJoseph YuanMaxim G. VavilovJavad ShabaniVladimir E. ManucharyanWe report a probable observation of the dc Josephson effect in mesoscopic junctions of three and four superconductors. The devices are fabricated in a top-down fashion from a hybrid semiconductor-superconductor InAs/Al epitaxial heterostructure. In general, the critical current of an N-terminal junction is an (N-1)-dimensional hypersurface in the space of bias currents, which can be reduced to a set of critical current contours. The geometry of critical current contours exhibits nontrivial responses to electrical gating, magnetic field, and phase bias, and it can be reproduced by the scattering formulation of the Josephson effect generalized to the case of N>2. Besides establishing solid ground beneath a host of recent theory proposals, our experiment accomplishes an important step toward creating trijunctions of topological superconductors, essential for braiding operations.http://doi.org/10.1103/PhysRevX.10.031051 |
| spellingShingle | Natalia Pankratova Hanho Lee Roman Kuzmin Kaushini Wickramasinghe William Mayer Joseph Yuan Maxim G. Vavilov Javad Shabani Vladimir E. Manucharyan Multiterminal Josephson Effect Physical Review X |
| title | Multiterminal Josephson Effect |
| title_full | Multiterminal Josephson Effect |
| title_fullStr | Multiterminal Josephson Effect |
| title_full_unstemmed | Multiterminal Josephson Effect |
| title_short | Multiterminal Josephson Effect |
| title_sort | multiterminal josephson effect |
| url | http://doi.org/10.1103/PhysRevX.10.031051 |
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