Artificial topological insulator realized in a two-terminal Josephson junction with Rashba spin-orbit interaction
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arXiv
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| Hauptverfasser: | , , |
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| Format: | Preprint |
| Veröffentlicht: |
2024
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| _version_ | 1866929715147702272 |
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| author | Medic, Luka Ramšak, Anton Rejec, Tomaž |
| author_facet | Medic, Luka Ramšak, Anton Rejec, Tomaž |
| contents | We study a two-terminal Josephson junction with conventional superconductors and a normal region with Rashba spin-orbit interaction, characterized by two Aharonov-Casher (AC) fluxes. When the superconducting phase difference equals $π$, the Andreev subgap spectrum may host zero-energy Weyl singularities associated with a vanishing normal-state reflection eigenvalue. With one of the AC fluxes playing the role of a quasimomentum, the junction can be viewed as an artificial one-dimensional chiral topological insulator. Its topological phase can be tuned by crossing a Weyl singularity by means of varying the remaining AC flux. By associating an additional component of the quasimomentum with the superconducting phase difference, an artificial Chern insulator is realized. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_05209 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Artificial topological insulator realized in a two-terminal Josephson junction with Rashba spin-orbit interaction Medic, Luka Ramšak, Anton Rejec, Tomaž Mesoscale and Nanoscale Physics Superconductivity We study a two-terminal Josephson junction with conventional superconductors and a normal region with Rashba spin-orbit interaction, characterized by two Aharonov-Casher (AC) fluxes. When the superconducting phase difference equals $π$, the Andreev subgap spectrum may host zero-energy Weyl singularities associated with a vanishing normal-state reflection eigenvalue. With one of the AC fluxes playing the role of a quasimomentum, the junction can be viewed as an artificial one-dimensional chiral topological insulator. Its topological phase can be tuned by crossing a Weyl singularity by means of varying the remaining AC flux. By associating an additional component of the quasimomentum with the superconducting phase difference, an artificial Chern insulator is realized. |
| title | Artificial topological insulator realized in a two-terminal Josephson junction with Rashba spin-orbit interaction |
| topic | Mesoscale and Nanoscale Physics Superconductivity |
| url | https://arxiv.org/abs/2412.05209 |