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  • Letter
  • Open Access

Optimal superconductivity in twisted bilayer WSe2 where the Van Hove singularity crosses half-filling

Michał Zegrodnik1,*, Waseem Akbar1, Andrzej Biborski1, and Louk Rademaker2,3

  • 1Academic Centre for Materials and Nanotechnology, AGH University of Krakow, Al. Mickiewicza 30, 30-059 Krakow, Poland
  • 2Department of Theoretical Physics, University of Geneva, CH-1211 Geneva, Switzerland
  • 3Institute-Lorentz for Theoretical Physics, Leiden University, P.O. Box 9506, Leiden NL-2300, The Netherlands

  • *Contact author: michal.zegrodnik@agh.edu.pl
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Phys. Rev. Research 8, L012070 – Published 25 March, 2026

DOI: https://doi.org/10.1103/pkf3-fkv4

Abstract

The recent discovery of unconventional superconductivity has pointed to twisted WSe2 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 WSe2. 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 correlation regime. The two factors create favorable conditions for the superconducting pairing only in a small area of the phase diagram.

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Phys. Rev. Research 8, L012070– Published 25 March, 2026
  • Received 2 June 2025
  • Accepted 28 January 2026
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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