Nematic, chiral and topological superconductivity in transition metal dichalcogenides
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arXiv
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| Format: | Preprint |
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2021
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| _version_ | 1866912291100819456 |
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| author | Schrade, Constantin Fu, Liang |
| author_facet | Schrade, Constantin Fu, Liang |
| contents | We introduce and study a realistic model for superconductivity in twisted bilayer WSe$_{2}$, where electron pairing arises from spin-valley fluctuations in the weak-coupling regime. Our model comprises both the full continuum model moiré bandstructure and a short-ranged repulsive interaction. By calculating the spin-valley susceptibility, we identify a Fermi surface nesting feature near half-filling of the top-most moiré band, which induces significantly enhanced spin-valley fluctuations. We then analyze the dominant Kohn-Luttinger pairing instabilities due to these spin-valley fluctuations and show that the leading instability corresponds to a two-component order parameter, which can give rise to nematic, chiral and topological superconductivity. As our findings are asymptotically exact for small interaction strengths, they provide a viable starting point for future studies of superconductivity in twisted transition metal dichalcogenide bilayers. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2110_10172 |
| institution | arXiv |
| publishDate | 2021 |
| record_format | arxiv |
| spellingShingle | Nematic, chiral and topological superconductivity in transition metal dichalcogenides Schrade, Constantin Fu, Liang Superconductivity Strongly Correlated Electrons We introduce and study a realistic model for superconductivity in twisted bilayer WSe$_{2}$, where electron pairing arises from spin-valley fluctuations in the weak-coupling regime. Our model comprises both the full continuum model moiré bandstructure and a short-ranged repulsive interaction. By calculating the spin-valley susceptibility, we identify a Fermi surface nesting feature near half-filling of the top-most moiré band, which induces significantly enhanced spin-valley fluctuations. We then analyze the dominant Kohn-Luttinger pairing instabilities due to these spin-valley fluctuations and show that the leading instability corresponds to a two-component order parameter, which can give rise to nematic, chiral and topological superconductivity. As our findings are asymptotically exact for small interaction strengths, they provide a viable starting point for future studies of superconductivity in twisted transition metal dichalcogenide bilayers. |
| title | Nematic, chiral and topological superconductivity in transition metal dichalcogenides |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2110.10172 |