Chiral and topological superconductivity in isospin polarized multilayer graphene
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866929509553405952 |
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| author | Geier, Max Davydova, Margarita Fu, Liang |
| author_facet | Geier, Max Davydova, Margarita Fu, Liang |
| contents | A microscopic mechanism for chiral superconductivity from Coulomb repulsion is proposed for spin- and valley-polarized state of rhombohedral multilayer graphene. The superconducting state occurs at low density, has chiral $p$-wave pairing symmetry, and exhibits highest $T_c$ close to a Lifshitz transition from annular to simply-connected Fermi sea. This Lifshitz transition also marks a topological phase transition from a trivial to a topological superconducting phase hosting Majorana fermions. The chirality of the superconducting order parameter is selected by the chirality of the valley-polarized Bloch electrons. Our results are in reasonable agreement with observations in a recent experiment on tetralayer graphene [arXiv:2408.15233] |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2409_13829 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Chiral and topological superconductivity in isospin polarized multilayer graphene Geier, Max Davydova, Margarita Fu, Liang Superconductivity Mesoscale and Nanoscale Physics A microscopic mechanism for chiral superconductivity from Coulomb repulsion is proposed for spin- and valley-polarized state of rhombohedral multilayer graphene. The superconducting state occurs at low density, has chiral $p$-wave pairing symmetry, and exhibits highest $T_c$ close to a Lifshitz transition from annular to simply-connected Fermi sea. This Lifshitz transition also marks a topological phase transition from a trivial to a topological superconducting phase hosting Majorana fermions. The chirality of the superconducting order parameter is selected by the chirality of the valley-polarized Bloch electrons. Our results are in reasonable agreement with observations in a recent experiment on tetralayer graphene [arXiv:2408.15233] |
| title | Chiral and topological superconductivity in isospin polarized multilayer graphene |
| topic | Superconductivity Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2409.13829 |