Robust supermoiré pattern in large-angle single-twist bilayers

doi:10.1038/s41567-025-02914-9

Robust supermoiré pattern in large-angle single-twist bilayers

2025-05-16

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Morales-Duran, Nicolas

DOI：10.1038/s41567-025-02914-9

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Forming long-wavelength moir & eacute; superlattices in van der Waals bilayers that have a small-angle twist between the two layers has been a key approach for creating moir & eacute; flat bands. However, for small twist angles, strong lattice reconstruction creates domain walls and other forms of disorder in the moir & eacute; pattern, posing considerable challenges for engineering such platforms. At large twist angles, the lattices are more rigid, but it is difficult to produce flat bands in shorter-wavelength moir & eacute; superlattices. Here we introduce an approach for tailoring robust supermoir & eacute; structures in bilayers of transition-metal dichalcogenides using only a single twist near a commensurate angle. Structurally, we show the spontaneous formation of a periodic arrangement of three inequivalent commensurate moir & eacute; stackings, where the angle deviation from the commensurate angle determines the periodicity. Electronically, we reveal a large set of van Hove singularities that indicate strong band hybridization, leading to flat bands near the valence band maximum. Our study extends the study of the interplay among band topology, quantum geometry and moir & eacute; superconductivity to the large twist angle regime.

Keywords:

ELECTRON-TUNNELING SPECTROSCOPY

UNCONVENTIONAL SUPERCONDUCTIVITY

PTYCHOGRAPHY

Robust supermoiré pattern in large-angle single-twist bilayers

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