Superconductivity in the twisted bilayer transition metal dichalcogenide <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mrow><mml:mi>WSe</mml:mi></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:math>: A quantum cluster study
Mathieu Bélanger, Jérôme Fournier, David Sénéchal
Abstract
The observation of flat energy bands in transition metal dichalcogenide bilayers such as twisted ${\mathrm{WSe}}_{2}$ makes those materials interesting prospects for reproducing the behavior observed in graphene-based systems. We use an effective Hubbard model providing a description of twisted ${\mathrm{WSe}}_{2}$ to explore the presence of superconductivity, which was previously reported in experiments. Using both the variational cluster approximation and cluster dynamical mean-field theory, we predict the existence of chiral superconductivity of type $d\ifmmode\pm\else\textpm\fi{}id$ that can be tuned by the twist angle and by the application of a perpendicular displacement field in both electron- and hole-doped systems.