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Monday, July 14, 2025

Kagome digital states in gradient-strained untwisted graphene bilayers


Moiré superlattices in twisted homo-bilayers have revealed unique digital states, together with unconventional superconductivity and correlated insulating phases. Nonetheless, their fabrication course of usually introduces moiré problems, hindering reproducibility and experimental management. Right here, we suggest another method utilizing gradient pressure to assemble moiré superlattices in untwisted bilayer graphene (gs-BLG). Via force-field and first-principles calculations, we present that gs-BLG displays kagome-like interlayer-spacing distributions and strain-tunable kagome digital bands. The competitors between interlayer coupling and in-plane pressure rest results in distinct structural deformations, giving rise to 3 types of diatomic kagome lattices: delicate, pronounced, and distorted. Kagome digital bands are recognized close to the Fermi stage of their band constructions. Modulating pressure gradients allows tailoring bandwidths and indicators of hopping parameters of those kagome bands, offering a flexible platform for finding out unique digital phases. Our findings set up gradient pressure as an alternative choice to twist engineering, opening an avenue for exploring emergent digital phases in graphene-based techniques.

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