Ultraflatbands and Shear Solitons in Moiré Patterns of Twisted Bilayer Transition Metal Dichalcogenides

Mit H. Naik and Manish Jain
Phys. Rev. Lett. 121, 266401 – Published 28 December 2018
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Abstract

Ultraflatbands in twisted bilayers of two-dimensional materials have the potential to host strong correlations, including the Mott-insulating phase at half-filling of the band. Using first-principles density functional theory calculations, we show the emergence of ultraflatbands at the valence band edge in twisted bilayer MoS2, a prototypical transition metal dichalcogenide. The computed band widths, 5 and 23 meV for 56.5° and 3.5° twist angles, respectively, are comparable to that of twisted bilayer graphene near “magic” angles. Large structural transformations in the moiré patterns lead to formation of shear solitons at stacking boundaries and strongly influence the electronic structure. We extend our analysis for twisted bilayer MoS2 to show that flatbands can occur at the valence band edge of twisted bilayer WS2, MoSe2, and WSe2 as well.

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  • Received 29 March 2018
  • Revised 26 July 2018

DOI:https://doi.org/10.1103/PhysRevLett.121.266401

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Mit H. Naik and Manish Jain*

  • Center for Condensed Matter Theory, Department of Physics, Indian Institute of Science, Bangalore 560012, India

  • *mjain@iisc.ac.in

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Issue

Vol. 121, Iss. 26 — 28 December 2018

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