Transport Signatures of Radial Rashba Spin-Orbit Coupling at Ferromagnet/Superconductor Interfaces
| Autor: | Costa, Andreas, Fabian, Jaroslav |
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| Rok vydání: | 2024 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | Spin-orbit coupling (SOC) emerging at the interfaces of superconducting magnetic tunnel junctions is at the heart of multiple unprecedented physical phenomena, covering triplet proximity effects induced by unconventional (spin-flip) Andreev reflections, giant transport magnetoansiotropies, sizable tunneling anomalous Hall effects, and electrically controlled current-reversing $ 0 $--$ \pi $(-like) transitions in Josephson contacts. Recent first-principles calculations proposed that the Rashba spin-orbit fields in twisted graphene/transition-metal dichalcogenide and van-der-Waals multilayers can -- owing to broken mirror symmetries -- exhibit an unconventional radial component (with spin parallel to the electron's momentum), which can be quantified by the Rashba angle $ \theta_\mathrm{R} $. We theoretically explore the ramifications of radial Rashba SOC at the interfaces of vertical ferromagnet/superconductor tunnel junctions with a focus on the magnetoanisotropies of the tunneling and tunneling-anomalous-Hall-effect conductances. Our results demonstrate that $ \theta_\mathrm{R} $ can be experimentally extracted from respective magnetization-angle shifts, providing a practical way to probe the radial Rashba SOC induced by twisted multilayers that are placed as tunneling barrier between ferromagnetic and superconducting electrodes. Comment: 9 pages, 6 figures |
| Databáze: | arXiv |
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