Proposed Quantum Twisting Scanning Probe Microscope over Twisted Bilayer Graphene

Proposed Quantum Twisting Scanning Probe Microscope over Twisted Bilayer Graphene

Twisted bilayer graphene (TBG) has the natural merits of tunable flat bands and localized states distributed as a triangular lattice. However, the application of this state remains obscure. By density functional theory (DFT) and p z orbital tight-binding model calculations, we investigate the tip-sh...

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Veröffentlicht in:Nano letters 2024-04, Vol.24 (15), p.4433-4438
Hauptverfasser: Ke, Yifan, Wan, Lingyun, Qin, Xinming, Hu, Wei, Yang, Jinlong
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Wan, Lingyun
Qin, Xinming
Hu, Wei
Yang, Jinlong
description Twisted bilayer graphene (TBG) has the natural merits of tunable flat bands and localized states distributed as a triangular lattice. However, the application of this state remains obscure. By density functional theory (DFT) and p z orbital tight-binding model calculations, we investigate the tip-shaped electrostatic potential of top valence electrons of TBG at half filling. Adsorption energy scanning of molecules above the TBG reveals that this tip efficiently attracts molecules selectively to AA-stacked or AB-stacked regions. Tip shapes can be controlled by their underlying electronic structure, with electrons of low bandwidth exhibiting a more localized feature. Our results indicate that TBG tips offer applications in noninvasive and nonpolluting measurements in scanning probe microscopy and theoretical guidance for 2D material-based probes.
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title Proposed Quantum Twisting Scanning Probe Microscope over Twisted Bilayer Graphene
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