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Strain fields in twisted bilayer graphene

These results establish the reconstruction mechanics underpinning the twist-angle-dependent electronic behaviour of twisted bilayer graphene and provide a framework for directly visualizing structural relaxation, disorder and strain in moiré materials.
Springer Nature (opens in a new tab)

py4DSTEM: A Software Package for Four-Dimensional Scanning Transmission Electron Microscopy Data Analysis

Abstract Scanning transmission electron microscopy (STEM) allows for imaging, diffraction, and spectroscopy of materials on length scales ranging from microns to atoms. By using a high-speed, direct…
Cambridge Press (opens in a new tab)

Supplementary Information for Multiple generations of grain aggregation in different environments preceded solar system body formation

Patterned probes for high precision 4D-STEM bragg measurements.

This work imprints a "bullseye" pattern onto the probe, by using a binary mask in the probe-forming aperture, to improve the robustness of the peak finding algorithm to intensity modulations inside the diffracted disks, and shows that this imprinting leads to substantially improved strain-mapping precision at the expense of a slight decrease in spatial resolution.
PubMed (opens in a new tab)

4D-STEM of Beam-Sensitive Materials

ConspectusScanning electron nanobeam diffraction, or 4D-STEM (four-dimensional scanning transmission electron microscopy), is a flexible and powerful approach to elucidate structure from "soft"…
Cambridge Press (opens in a new tab)

Search for meteoritic GEMS I: Comparison of amorphous silicates in Paris and Acfer 094 chondrite matrices and in anhydrous chondritic interplanetary dust particles

Abstract Amorphous silicates in meteoritic samples are significant as potential surviving interstellar dust from the formation of the Solar System. Amorphous silicate-rich grains called GEMS, glass…
Publisher (opens in a new tab)

Measuring temperature-dependent thermal diffuse scattering using scanning transmission electron microscopy

Scanning transmission electron microscopy (STEM) thermometry techniques offer the potential for mapping temperature (T) with high spatial resolution. Existing STEM thermometry methods based on…
Publisher (opens in a new tab)

In Situ TEM Study of the Degradation of PbSe Nanocrystals in Air

PbSe nanocrystals have attracted widespread attention due to a variety of potential applications. However, the practical utility of these nanocrystals has been hindered by their poor air stability,…
Publisher (opens in a new tab)

Direct imaging of short-range order and its impact on deformation in Ti-6Al

The domain structure of short-range order is directly observed in an aged Ti-6Al alloy and the destruction of these domains by dislocation planar slip is observed after ex situ and in situ TEM mechanical testing, confirming the impact of SRO in Ti-Al alloys on the scale of angstroms.
AAAS (opens in a new tab)

Unveiling Corrosion Pathways of Sn Nanocrystals through High-Resolution Liquid Cell Electron Microscopy

Unveiling materials’ corrosion pathways is significant for understanding the corrosion mechanisms and designing corrosion-resistant materials. Here, we investigate the corrosion behavior of Sn@Ni3Sn4…
PubMed (opens in a new tab)
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