Intrinsic nonmagnetic ϕ_{0} Josephson junctions in twisted bilayer graphene
Recent experiments have demonstrated the possibility to design highly controllable junctions on magic angle twisted bilayer graphene, enabling the test of its superconducting transport properties. We show that the presence of chiral pairing in such devices manifests in the appearance of an anomalous...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2023-09-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.5.L032033 |
| _version_ | 1797210394839744512 |
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| author | M. Alvarado P. Burset A. Levy Yeyati |
| author_facet | M. Alvarado P. Burset A. Levy Yeyati |
| author_sort | M. Alvarado |
| collection | DOAJ |
| description | Recent experiments have demonstrated the possibility to design highly controllable junctions on magic angle twisted bilayer graphene, enabling the test of its superconducting transport properties. We show that the presence of chiral pairing in such devices manifests in the appearance of an anomalous Josephson effect (ϕ_{0} behavior) even in the case of symmetric junctions and without requiring any magnetic materials or fields. Such behavior arises from a combination of chiral pairing and nontrivial topology of the twisted bilayer graphene band structure that can effectively break inversion symmetry. Moreover, we show that the ϕ_{0} effect could be experimentally enhanced and controlled by electrostatic tuning of the junction transmission properties. |
| first_indexed | 2024-04-24T10:09:54Z |
| format | Article |
| id | doaj.art-b19c61705518427d991a75acf2a9b310 |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:09:54Z |
| publishDate | 2023-09-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-b19c61705518427d991a75acf2a9b3102024-04-12T17:33:57ZengAmerican Physical SocietyPhysical Review Research2643-15642023-09-0153L03203310.1103/PhysRevResearch.5.L032033Intrinsic nonmagnetic ϕ_{0} Josephson junctions in twisted bilayer grapheneM. AlvaradoP. BursetA. Levy YeyatiRecent experiments have demonstrated the possibility to design highly controllable junctions on magic angle twisted bilayer graphene, enabling the test of its superconducting transport properties. We show that the presence of chiral pairing in such devices manifests in the appearance of an anomalous Josephson effect (ϕ_{0} behavior) even in the case of symmetric junctions and without requiring any magnetic materials or fields. Such behavior arises from a combination of chiral pairing and nontrivial topology of the twisted bilayer graphene band structure that can effectively break inversion symmetry. Moreover, we show that the ϕ_{0} effect could be experimentally enhanced and controlled by electrostatic tuning of the junction transmission properties.http://doi.org/10.1103/PhysRevResearch.5.L032033 |
| spellingShingle | M. Alvarado P. Burset A. Levy Yeyati Intrinsic nonmagnetic ϕ_{0} Josephson junctions in twisted bilayer graphene Physical Review Research |
| title | Intrinsic nonmagnetic ϕ_{0} Josephson junctions in twisted bilayer graphene |
| title_full | Intrinsic nonmagnetic ϕ_{0} Josephson junctions in twisted bilayer graphene |
| title_fullStr | Intrinsic nonmagnetic ϕ_{0} Josephson junctions in twisted bilayer graphene |
| title_full_unstemmed | Intrinsic nonmagnetic ϕ_{0} Josephson junctions in twisted bilayer graphene |
| title_short | Intrinsic nonmagnetic ϕ_{0} Josephson junctions in twisted bilayer graphene |
| title_sort | intrinsic nonmagnetic ϕ 0 josephson junctions in twisted bilayer graphene |
| url | http://doi.org/10.1103/PhysRevResearch.5.L032033 |
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