Anomalous Josephson coupling and high-harmonics in non-centrosymmetric superconductors with S-wave spin-triplet pairing
Abstract We study the Josephson effects arising in junctions made of non-centrosymmetric superconductors with spin-triplet pairing having s-wave orbital-singlet symmetry. We demonstrate that the orbital dependent character of the spin-triplet order parameter determines its non-trivial texture in the...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2022-09-01
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| Series: | npj Quantum Materials |
| Online Access: | https://doi.org/10.1038/s41535-022-00509-8 |
| _version_ | 1811200840051982336 |
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| author | Yuri Fukaya Yukio Tanaka Paola Gentile Keiji Yada Mario Cuoco |
| author_facet | Yuri Fukaya Yukio Tanaka Paola Gentile Keiji Yada Mario Cuoco |
| author_sort | Yuri Fukaya |
| collection | DOAJ |
| description | Abstract We study the Josephson effects arising in junctions made of non-centrosymmetric superconductors with spin-triplet pairing having s-wave orbital-singlet symmetry. We demonstrate that the orbital dependent character of the spin-triplet order parameter determines its non-trivial texture in the momentum space due to the inversion symmetry breaking and spin-orbit interactions. The emergence of this pattern is responsible for the occurrence of an anomalous Josephson coupling and a dominance of high-harmonics in the current phase relation. Remarkably, due to the spin-orbital couplings, variations in the electronic structure across the heterostructure can generally turn the ground state of the junction from 0- to a generic value of the Josephson phase, thus realizing the so-called φ-junction. Hallmarks of the resulting Josephson behavior, apart from non-standard current-phase relation, are provided by an unconventional temperature and magnetic field dependence of the critical current. These findings indicate the path for the design of superconducting orbitronics devices and account for several observed anomalies of the supercurrent in oxide interface superconductors. |
| first_indexed | 2024-04-12T02:10:30Z |
| format | Article |
| id | doaj.art-baa60c34b4f6496888102643d5b1653e |
| institution | Directory Open Access Journal |
| issn | 2397-4648 |
| language | English |
| last_indexed | 2024-04-12T02:10:30Z |
| publishDate | 2022-09-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | npj Quantum Materials |
| spelling | doaj.art-baa60c34b4f6496888102643d5b1653e2022-12-22T03:52:24ZengNature Portfolionpj Quantum Materials2397-46482022-09-01711810.1038/s41535-022-00509-8Anomalous Josephson coupling and high-harmonics in non-centrosymmetric superconductors with S-wave spin-triplet pairingYuri Fukaya0Yukio Tanaka1Paola Gentile2Keiji Yada3Mario Cuoco4CNR-SPIN, c/o Universitá di SalernoDepartment of Applied Physics, Nagoya UniversityCNR-SPIN, c/o Universitá di SalernoDepartment of Applied Physics, Nagoya UniversityCNR-SPIN, c/o Universitá di SalernoAbstract We study the Josephson effects arising in junctions made of non-centrosymmetric superconductors with spin-triplet pairing having s-wave orbital-singlet symmetry. We demonstrate that the orbital dependent character of the spin-triplet order parameter determines its non-trivial texture in the momentum space due to the inversion symmetry breaking and spin-orbit interactions. The emergence of this pattern is responsible for the occurrence of an anomalous Josephson coupling and a dominance of high-harmonics in the current phase relation. Remarkably, due to the spin-orbital couplings, variations in the electronic structure across the heterostructure can generally turn the ground state of the junction from 0- to a generic value of the Josephson phase, thus realizing the so-called φ-junction. Hallmarks of the resulting Josephson behavior, apart from non-standard current-phase relation, are provided by an unconventional temperature and magnetic field dependence of the critical current. These findings indicate the path for the design of superconducting orbitronics devices and account for several observed anomalies of the supercurrent in oxide interface superconductors.https://doi.org/10.1038/s41535-022-00509-8 |
| spellingShingle | Yuri Fukaya Yukio Tanaka Paola Gentile Keiji Yada Mario Cuoco Anomalous Josephson coupling and high-harmonics in non-centrosymmetric superconductors with S-wave spin-triplet pairing npj Quantum Materials |
| title | Anomalous Josephson coupling and high-harmonics in non-centrosymmetric superconductors with S-wave spin-triplet pairing |
| title_full | Anomalous Josephson coupling and high-harmonics in non-centrosymmetric superconductors with S-wave spin-triplet pairing |
| title_fullStr | Anomalous Josephson coupling and high-harmonics in non-centrosymmetric superconductors with S-wave spin-triplet pairing |
| title_full_unstemmed | Anomalous Josephson coupling and high-harmonics in non-centrosymmetric superconductors with S-wave spin-triplet pairing |
| title_short | Anomalous Josephson coupling and high-harmonics in non-centrosymmetric superconductors with S-wave spin-triplet pairing |
| title_sort | anomalous josephson coupling and high harmonics in non centrosymmetric superconductors with s wave spin triplet pairing |
| url | https://doi.org/10.1038/s41535-022-00509-8 |
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