Valley crossed Andreev reflection in graphene periodic line defect superlattice junctions
Abstract We study the crossed Andreev reflection and the nonlocal transport in the staggered graphene/superconductor/periodic line defect superlattice (LDGSL) junctions. The staggered pseudospin potential in the left graphene electrode suppress the local Andreev reflection, while the elastic cotunne...
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Nature Portfolio
2025-05-01
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| Online Access: | https://doi.org/10.1038/s41598-025-01019-w |
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| author | Chongdan Ren Minglei Sun Hongyu Tian Sake Wang |
| author_facet | Chongdan Ren Minglei Sun Hongyu Tian Sake Wang |
| author_sort | Chongdan Ren |
| collection | DOAJ |
| description | Abstract We study the crossed Andreev reflection and the nonlocal transport in the staggered graphene/superconductor/periodic line defect superlattice (LDGSL) junctions. The staggered pseudospin potential in the left graphene electrode suppress the local Andreev reflection, while the elastic cotunneling of K′ valley electrons is inhibited due to the exclusive rightward motion of K valley electrons in the right LDGSL electrode, thereby enabling the realization of dominant intravalley crossed Andreev reflection for incident electrons from the K′ valley. Meanwhile, the intravalley elastic cotunneling occurs while both local Andreev reflection and crossed Andreev reflection are completely eliminated for incident electrons in the K valley. Furthermore, the probability of intervalley crossed Andreev reflection scattering is significantly lower than that of intravalley CAR scattering across a broad range of incident angles and electron energies. Our results are helpful for designing the flexible and high-efficiency Cooper pair splitter based on the valley degree of freedom. |
| format | Article |
| id | doaj-art-4be31cd0f9664efe828552ac041dc144 |
| institution | OA Journals |
| issn | 2045-2322 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj-art-4be31cd0f9664efe828552ac041dc1442025-08-20T01:49:47ZengNature PortfolioScientific Reports2045-23222025-05-011511810.1038/s41598-025-01019-wValley crossed Andreev reflection in graphene periodic line defect superlattice junctionsChongdan Ren0Minglei Sun1Hongyu Tian2Sake Wang3Département de physique, Université normale de ZunyiDepartment of Physics, NANOlab Center of Excellence, University of AntwerpSchool of Physics and Electronic Engineering, Linyi UniversityCollege of Science, Jinling Institute of TechnologyAbstract We study the crossed Andreev reflection and the nonlocal transport in the staggered graphene/superconductor/periodic line defect superlattice (LDGSL) junctions. The staggered pseudospin potential in the left graphene electrode suppress the local Andreev reflection, while the elastic cotunneling of K′ valley electrons is inhibited due to the exclusive rightward motion of K valley electrons in the right LDGSL electrode, thereby enabling the realization of dominant intravalley crossed Andreev reflection for incident electrons from the K′ valley. Meanwhile, the intravalley elastic cotunneling occurs while both local Andreev reflection and crossed Andreev reflection are completely eliminated for incident electrons in the K valley. Furthermore, the probability of intervalley crossed Andreev reflection scattering is significantly lower than that of intravalley CAR scattering across a broad range of incident angles and electron energies. Our results are helpful for designing the flexible and high-efficiency Cooper pair splitter based on the valley degree of freedom.https://doi.org/10.1038/s41598-025-01019-wcrossed Andreev reflectionperiodic line defect superlatticeelastic cotunneling |
| spellingShingle | Chongdan Ren Minglei Sun Hongyu Tian Sake Wang Valley crossed Andreev reflection in graphene periodic line defect superlattice junctions Scientific Reports crossed Andreev reflection periodic line defect superlattice elastic cotunneling |
| title | Valley crossed Andreev reflection in graphene periodic line defect superlattice junctions |
| title_full | Valley crossed Andreev reflection in graphene periodic line defect superlattice junctions |
| title_fullStr | Valley crossed Andreev reflection in graphene periodic line defect superlattice junctions |
| title_full_unstemmed | Valley crossed Andreev reflection in graphene periodic line defect superlattice junctions |
| title_short | Valley crossed Andreev reflection in graphene periodic line defect superlattice junctions |
| title_sort | valley crossed andreev reflection in graphene periodic line defect superlattice junctions |
| topic | crossed Andreev reflection periodic line defect superlattice elastic cotunneling |
| url | https://doi.org/10.1038/s41598-025-01019-w |
| work_keys_str_mv | AT chongdanren valleycrossedandreevreflectioningrapheneperiodiclinedefectsuperlatticejunctions AT mingleisun valleycrossedandreevreflectioningrapheneperiodiclinedefectsuperlatticejunctions AT hongyutian valleycrossedandreevreflectioningrapheneperiodiclinedefectsuperlatticejunctions AT sakewang valleycrossedandreevreflectioningrapheneperiodiclinedefectsuperlatticejunctions |