Phase stiffness in flat-band superconductors with nodal pairing
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arXiv
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| Autori principali: | , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866911508997341184 |
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| author | Zyuzin, A. A. Zyuzin, A. Yu. |
| author_facet | Zyuzin, A. A. Zyuzin, A. Yu. |
| contents | We study Bogoliubov quasiparticle spectrum in a two-band system with momentum-dependent hybridization between a dispersive band and a flat band. The interplay between the interband mixing and intraband Cooper pairing may give rise to a parabolic node in the spectrum of flat band quasiparticles, resulting in a quadratic temperature dependence of the superconducting phase stiffness at low temperatures. We also comment that nonmagnetic disorder induces Machida-Shibata deep subgap resonances suggesting the sensitivity of flat-band superconductivity to disorder. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_11986 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Phase stiffness in flat-band superconductors with nodal pairing Zyuzin, A. A. Zyuzin, A. Yu. Superconductivity Mesoscale and Nanoscale Physics We study Bogoliubov quasiparticle spectrum in a two-band system with momentum-dependent hybridization between a dispersive band and a flat band. The interplay between the interband mixing and intraband Cooper pairing may give rise to a parabolic node in the spectrum of flat band quasiparticles, resulting in a quadratic temperature dependence of the superconducting phase stiffness at low temperatures. We also comment that nonmagnetic disorder induces Machida-Shibata deep subgap resonances suggesting the sensitivity of flat-band superconductivity to disorder. |
| title | Phase stiffness in flat-band superconductors with nodal pairing |
| topic | Superconductivity Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2603.11986 |