Magic in twisted transition metal dichalcogenide bilayers

Devakul, Trithep; Crépel, Valentin; Zhang, Yang; Fu, Liang

doi:10.1038/s41467-021-27042-9

Title: Magic in twisted transition metal dichalcogenide bilayers

Journal Article · Thu Nov 18 00:00:00 EST 2021 · Nature Communications

DOI:https://doi.org/10.1038/s41467-021-27042-9· OSTI ID:1904375

^[1]; Crépel, Valentin ^[1];

^[1];

^[1]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

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 WSe₂, 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 θ < 4°, 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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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); Simons Foundation; David and Lucile Packard Foundation

Grant/Contract Number:: SC0018945; SC0020149

OSTI ID:: 1904375

Journal Information:: Nature Communications, Vol. 12, Issue 1; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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