Intra-unit-cell singlet pairing mediated by altermagnetic fluctuations
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866909958993346560 |
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| author | Wu, Yi-Ming Wang, Yuxuan Fernandes, Rafael M. |
| author_facet | Wu, Yi-Ming Wang, Yuxuan Fernandes, Rafael M. |
| contents | We investigate the superconducting instabilities induced by altermagnetic fluctuations. Because of the non-trivial sublattice structure of the altermagnetic order, shorter-range and longer-range fluctuations favor qualitatively different types of pairing states. Specifically, while the latter stabilize a standard spin-triplet $p$-wave state, just like ferromagnetic fluctuations, the former leads to intra-unit-cell pairing, in which the Cooper pairs are formed by electrons from different sublattices. The symmetry of the intra-unit-cell gap function can be not only $p$-wave, but also spin-singlet $s$-wave and $d$-wave, depending on the shape of the Fermi surface. We also show that coexistence with altermagnetic order promotes intrinsic non-trivial topology, such as protected Bogoliubov Fermi surfaces and higher-order topological superconductivity. Our work establishes the key role played by sublattice degrees of freedom in altermagnetic-fluctuation mediated interactions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_04356 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Intra-unit-cell singlet pairing mediated by altermagnetic fluctuations Wu, Yi-Ming Wang, Yuxuan Fernandes, Rafael M. Superconductivity We investigate the superconducting instabilities induced by altermagnetic fluctuations. Because of the non-trivial sublattice structure of the altermagnetic order, shorter-range and longer-range fluctuations favor qualitatively different types of pairing states. Specifically, while the latter stabilize a standard spin-triplet $p$-wave state, just like ferromagnetic fluctuations, the former leads to intra-unit-cell pairing, in which the Cooper pairs are formed by electrons from different sublattices. The symmetry of the intra-unit-cell gap function can be not only $p$-wave, but also spin-singlet $s$-wave and $d$-wave, depending on the shape of the Fermi surface. We also show that coexistence with altermagnetic order promotes intrinsic non-trivial topology, such as protected Bogoliubov Fermi surfaces and higher-order topological superconductivity. Our work establishes the key role played by sublattice degrees of freedom in altermagnetic-fluctuation mediated interactions. |
| title | Intra-unit-cell singlet pairing mediated by altermagnetic fluctuations |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2506.04356 |