Topological superconductivity and superconducting diode effect mediated via unconventional magnet and Ising spin-orbit coupling
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arXiv
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| Autores principales: | , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866909040796237824 |
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| author | Pal, Amartya Mondal, Debashish Nag, Tanay Saha, Arijit |
| author_facet | Pal, Amartya Mondal, Debashish Nag, Tanay Saha, Arijit |
| contents | We propose a theoretical framework in which a one-dimensional (1D) tight-binding model incorporating unconventional magnetic order together with Rashba and Ising spin-orbit couplings are considered to realize two key phenomena in condensed matter systems: topological superconductivity and the superconducting diode effect (SDE). We first elucidate the underlying band topology of the normal-state Hamiltonian and subsequently introduce an on-site attractive Hubbard interaction. Performing a a self-consistent mean-field analysis, we establish superconducting order parameters in both the conventional Bardeen-Cooper-Schrieffer (BCS) and finite-momentum Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) pairing channels. Intriguingly, both pairing states can support topological superconductivity, characterized by a nontrivial winding number, and lead to the emergence of four zero-energy Majorana modes localized at the ends of the 1D chain. The FFLO state further gives rise to an intrinsic field-free SDE, manifested as a nonreciprocal supercurrent and quantified by the diode efficiency $η$. Notably, our model yields a large diode efficiency $η\sim 65\%$, highlighting its potential for realising topological superconductivity and highly efficient superconducting devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_01266 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Topological superconductivity and superconducting diode effect mediated via unconventional magnet and Ising spin-orbit coupling Pal, Amartya Mondal, Debashish Nag, Tanay Saha, Arijit Mesoscale and Nanoscale Physics Superconductivity We propose a theoretical framework in which a one-dimensional (1D) tight-binding model incorporating unconventional magnetic order together with Rashba and Ising spin-orbit couplings are considered to realize two key phenomena in condensed matter systems: topological superconductivity and the superconducting diode effect (SDE). We first elucidate the underlying band topology of the normal-state Hamiltonian and subsequently introduce an on-site attractive Hubbard interaction. Performing a a self-consistent mean-field analysis, we establish superconducting order parameters in both the conventional Bardeen-Cooper-Schrieffer (BCS) and finite-momentum Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) pairing channels. Intriguingly, both pairing states can support topological superconductivity, characterized by a nontrivial winding number, and lead to the emergence of four zero-energy Majorana modes localized at the ends of the 1D chain. The FFLO state further gives rise to an intrinsic field-free SDE, manifested as a nonreciprocal supercurrent and quantified by the diode efficiency $η$. Notably, our model yields a large diode efficiency $η\sim 65\%$, highlighting its potential for realising topological superconductivity and highly efficient superconducting devices. |
| title | Topological superconductivity and superconducting diode effect mediated via unconventional magnet and Ising spin-orbit coupling |
| topic | Mesoscale and Nanoscale Physics Superconductivity |
| url | https://arxiv.org/abs/2512.01266 |