Theory of topological superconductivity and antiferromagnetic correlated insulators in twisted bilayer WSe2

Chuyi Tuo, Ming-Rui Li, Zhengzhi Wu, Wen Sun and Hong Yao ()
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Chuyi Tuo: Tsinghua University
Ming-Rui Li: Tsinghua University
Zhengzhi Wu: Tsinghua University
Wen Sun: Tsinghua University
Hong Yao: Tsinghua University

Nature Communications, 2025, vol. 16, issue 1, 1-9

Abstract: Abstract Since the very recent discovery of unconventional superconductivity in twisted WSe2 homobilayers at filling ν = − 1, considerable interest has arisen in revealing its mechanism. In this paper, we developed a three-band tight-binding model with non-trivial band topology by direct Wannierization of the low-energy continuum model. Incorporating both onsite Hubbard repulsion and next-nearest-neighbor attraction, we then performed a mean-field analysis of the microscopic model and obtained a phase diagram qualitatively consistent with the experiment results. For zero or weak displacement field, the ground state is a Chern number C = ± 2 topological superconductor in the Altland-Zirnbauer A-class (breaking time-reversal but preserving total Sz symmetry) with inter-valley pairing dominant in $${d}_{xy}\pm i{d}_{{x}^{2}-{y}^{2}}$$ d x y ± i d x 2 − y 2 –wave (mixing with a subdominant px ∓ ipy-wave) component. For a relatively strong displacement field, the ground state is a correlated insulator with the 120° antiferromagnetic order. Our results provide new insights into the nature of the twisted WSe2 systems and suggest the need for further theoretical and experimental explorations.

Date: 2025
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DOI: 10.1038/s41467-025-64519-3

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