Optimal superconductivity in twisted bilayer WSe$_2$ where the Van Hove singularity crosses half-filling
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| Main Authors: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866908610022342656 |
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| author | Zegrodnik, Michał Akbar, Waseem Biborski, Andrzej Rademaker, Louk |
| author_facet | Zegrodnik, Michał Akbar, Waseem Biborski, Andrzej Rademaker, Louk |
| contents | The recent discovery of unconventional superconductivity has pointed to twisted WSe$_2$ bilayer as a versatile platform for studying the correlated and topological phases of matter. Here we analyze the effect of the displacement field and electron interactions on the formation of a topological paired state in twisted WSe$_2$. Our approach is based on the effective single band $t$-$J$-$U$ model supplemented with intersite Coulomb interaction term and treated within the Gutzwiller approximation. We show that the superconducting phase is stabilized in a small range of displacement fields where the Van Hove singularity crosses half-filling, which is in qualitative agreement with recent experimental data. According to our analysis, such a circumstance comes as a result of a subtle interplay between the large density of states of the Van Hove singularity, in combination with the renormalization effects that appear in the weak-to-moderate correlations regime. The two factors create favorable conditions for the SC pairing only in a small area of the phase diagram. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2510_21384 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Optimal superconductivity in twisted bilayer WSe$_2$ where the Van Hove singularity crosses half-filling Zegrodnik, Michał Akbar, Waseem Biborski, Andrzej Rademaker, Louk Superconductivity Strongly Correlated Electrons The recent discovery of unconventional superconductivity has pointed to twisted WSe$_2$ bilayer as a versatile platform for studying the correlated and topological phases of matter. Here we analyze the effect of the displacement field and electron interactions on the formation of a topological paired state in twisted WSe$_2$. Our approach is based on the effective single band $t$-$J$-$U$ model supplemented with intersite Coulomb interaction term and treated within the Gutzwiller approximation. We show that the superconducting phase is stabilized in a small range of displacement fields where the Van Hove singularity crosses half-filling, which is in qualitative agreement with recent experimental data. According to our analysis, such a circumstance comes as a result of a subtle interplay between the large density of states of the Van Hove singularity, in combination with the renormalization effects that appear in the weak-to-moderate correlations regime. The two factors create favorable conditions for the SC pairing only in a small area of the phase diagram. |
| title | Optimal superconductivity in twisted bilayer WSe$_2$ where the Van Hove singularity crosses half-filling |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2510.21384 |