Magic in twisted transition metal dichalcogenide bilayers

Abstract

The long wavelength moiré superlattices in twisted 2D structures have emerged as a highly tunable platform for strongly correlated electron physics. We study the moiré bands in twisted transition metal dichalcogenide homobilayers, focusing on WSe${}_2$, at small twist angles using a combination of first principles density functional theory, continuum modeling, and Hartree-Fock approximation. We reveal the rich physics at small twist angles $\theta <4^{\circ }$, and identify a particular magic angle at which the top valence moiré band achieves almost perfect flatness. In the vicinity of this magic angle, we predict the realization of a generalized Kane-Mele model with a topological flat band, interaction-driven Haldane insulator, and Mott insulators at the filling of one hole per moiré unit cell. The combination of flat dispersion and uniformity of Berry curvature near the magic angle holds promise for realizing fractional quantum anomalous Hall effect at fractional filling. We also identify twist angles favorable for quantum spin Hall insulators and interaction-induced quantum anomalous Hall insulators at other integer fillings.

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Cited by in corpus (42)

• Quantum anomalous Hall effect from intertwined moiré bands
• Anomalous Hall metal and fractional Chern insulator in twisted transition metal dichalcogenides
• Tunable bilayer Hubbard model physics in twisted WSe2
• Topological and stacked flat bands in bilayer graphene with a superlattice potential
• Transferable E(3) equivariant parameterization for Hamiltonian of molecules and solids
• Topological Phases in AB-Stacked MoTe${}_2$/WSe${}_2$: ${\mathbb{Z}}_2$ Topological Insulators, Chern Insulators, and Topological Charge Density Waves
• Quantum anomalous Hall effect from inverted charge transfer gap
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