Proposed Quantum Twisting Scanning Probe Microscope over Twisted Bilayer Graphene.
Yifan KeLingyun WanXinming QinWei HuJinglong YangPublished in: Nano letters (2024)
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.
Keyphrases
- density functional theory
- molecular dynamics
- high resolution
- electron microscopy
- living cells
- single molecule
- quantum dots
- machine learning
- deep learning
- carbon nanotubes
- small molecule
- blood brain barrier
- molecular dynamics simulations
- walled carbon nanotubes
- high throughput
- mass spectrometry
- neural network
- climate change
- dna binding
- molecular docking
- fluorescence imaging
- human health
- nucleic acid
- single cell