Altermon: a magnetic-field-free parity protected qubit based on a narrow altermagnet Josephson junction
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866909869452296192 |
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| author | Vosoughi-nia, Sakineh Nowak, Michał P. |
| author_facet | Vosoughi-nia, Sakineh Nowak, Michał P. |
| contents | Altermagnets provide a new route to engineer superconducting circuits without magnetic fields. We theoretically study the Andreev bound state (ABS) spectrum of a finite-width altrmagnet-based Josephson junction and show how the $d$-wave altermagnetic symmetry and geometric confinement shape its low-energy excitations. We find a clear distinction between the two $d$-wave symmetries: $d_{x^2-y^2}$ order produces spin splitting, whereas $d_{xy}$ order preserves spin degeneracy and exhibits splitting of the ABS spectrum induced by intermode hybridization. Leveraging these novel features, we propose applying a transverse electric field to tune the system and realize a magnetic-field-free, parity-protected superconducting qubit that we call altermon. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_18145 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Altermon: a magnetic-field-free parity protected qubit based on a narrow altermagnet Josephson junction Vosoughi-nia, Sakineh Nowak, Michał P. Mesoscale and Nanoscale Physics Superconductivity Altermagnets provide a new route to engineer superconducting circuits without magnetic fields. We theoretically study the Andreev bound state (ABS) spectrum of a finite-width altrmagnet-based Josephson junction and show how the $d$-wave altermagnetic symmetry and geometric confinement shape its low-energy excitations. We find a clear distinction between the two $d$-wave symmetries: $d_{x^2-y^2}$ order produces spin splitting, whereas $d_{xy}$ order preserves spin degeneracy and exhibits splitting of the ABS spectrum induced by intermode hybridization. Leveraging these novel features, we propose applying a transverse electric field to tune the system and realize a magnetic-field-free, parity-protected superconducting qubit that we call altermon. |
| title | Altermon: a magnetic-field-free parity protected qubit based on a narrow altermagnet Josephson junction |
| topic | Mesoscale and Nanoscale Physics Superconductivity |
| url | https://arxiv.org/abs/2510.18145 |