pAET: 3D Imaging of 6,648 Individual Carbon Atoms in Graphene

Nature Nanotechnology

Overview

Researchers have demonstrated ptychographic atomic electron tomography (pAET) to achieve 3D localization of 6,648 carbon atoms with a precision of 0.12<0xE2><0x80><0x89>Å. Using twisted bilayer graphene as a model, the method reveals stacking-dependent interlayer spacing and chiral lattice distortions. This establishes a route to link the 3D atomic structure of light-element materials with their physical properties.

In Depth

Key Findings

The study demonstrates the use of ptychographic atomic electron tomography (pAET) to achieve the 3D localization of 6,648 individual carbon atoms. The researchers achieved a localization precision of 0.12<0xE2><0x80><0x89>Å using twisted bilayer graphene as a model moiré system. The resulting 3D structure reveals corrugation across the moiré supercell and stacking-dependent interlayer spacing.

Technical Details

The research identifies chiral lattice distortions characterized by anti-skyrmion-like, meron-like, and anti-meron-like textures. To validate the experimental results, the team employed density functional theory (DFT) calculations based on the derived structure. These calculations predict a gap at the K point and electronic band narrowing when compared to a relaxed model. Additionally, multislice pAET simulations indicate that this imaging method can be extended to amorphous carbon and diamond containing a nitrogen–vacancy centre.

Background & Context

Ptychography is a computational microscopy method that combines iterative phase retrieval with coherent diffraction to unify microscopy and crystallography. While multislice electron ptychography can achieve deep-sub-ångström lateral resolution, its depth resolution has typically been limited to the nanometre scale. pAET was developed to enable 3D atomic structure determination in nanomaterials, addressing the specific challenge of reliably resolving individual light atoms.

Significance & Outlook

By establishing pAET for the 3D imaging of individual carbon atoms, this work provides a methodology to connect the 3D atomic arrangement of light-element materials directly to their properties. The ability to resolve light atoms in three dimensions opens new possibilities for analyzing the structural nuances of carbon-based nanomaterials and other light-element systems.

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