Unraveling the 3D atomic structure of a suspended graphene/hBN van der Waals heterostructure
arXiv:1702.02836 · doi:10.1021/acs.nanolett.6b04360
Abstract
In this work we demonstrate that a free-standing van der Waals heterostructure, usually regarded as a flat object, can exhibit an intrinsic buckled atomic structure resulting from the interaction between two layers with a small lattice mismatch. We studied a freely suspended membrane of well aligned graphene on a hexagonal boron nitride (hBN) monolayer by transmission electron microscopy (TEM) and scanning TEM (STEM). We developed a detection method in the STEM that is capable of recording the direction of the scattered electron beam and that is extremely sensitive to the local stacking of atoms. Comparison between experimental data and simulated models shows that the heterostructure effectively bends in the out-of-plane direction, producing an undulated structure having a periodicity that matches the moiré wavelength. We attribute this rippling to the interlayer interaction and also show how this affects the intralayer strain in each layer.
arXiv comment21 pages, 5 figures
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- Large phosphorene in-plane contraction induced by interlayer interactions in graphene-phosphorene heterostructures
- Stacking in incommensurate graphene/hexagonal-boron-nitride heterostructures based on ab initio study of interlayer interaction
- Convergent beam electron holography for analysis of van der Waals heterostructures
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- Structural, electronic, and optical properties of periodic graphene/h-BN van der Waals heterostructures
- Interferometric 4D-STEM for Lattice Distortion and Interlayer Spacing Measurements in Bilayer and Trilayer Two-dimensional Materials
- Van der Waals interlayer potential of graphitic structures: from Lennard-Jones to Kolmogorov-Crespy and Lebedeva models
- Universal description of potential energy surface of interlayer interaction in two-dimensional materials by first spatial Fourier harmonics
- High-Performance All-Optical Modulator Based on Graphene-hBN Heterostructures
- Strong gate-tunability of flat bands in bilayer graphene due to moiré encapsulation between hBN monolayers
- Hexagonal boron-carbon fullerene heterostructures; Stable two-dimensional semiconductors with remarkable stiffness, low thermal conductivity and flat bands
- Semimetallic and semiconducting graphene-hBN multilayers with parallel or reverse stacking
- Electronic and Spin-Orbit Properties of hBN Encapsulated Bilayer Graphene