Four-dimensional scanning transmission electron microscopy (4D-STEM): From scanning nanodiffraction to ptychography and beyond

C Ophus - Microscopy and Microanalysis, 2019 - cambridge.org
Scanning transmission electron microscopy (STEM) is widely used for imaging, diffraction,
and spectroscopy of materials down to atomic resolution. Recent advances in detector …

py4DSTEM: A software package for four-dimensional scanning transmission electron microscopy data analysis

BH Savitzky, SE Zeltmann, LA Hughes… - Microscopy and …, 2021 - cambridge.org
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 …

Polar and quasicrystal vortex observed in twisted-bilayer molybdenum disulfide

CS Tsang, X Zheng, T Yang, Z Yan, W Han, LW Wong… - Science, 2024 - science.org
We report the observation of an electric field in twisted-bilayer molybdenum disulfide (MoS2)
and elucidate its correlation with local polar domains using four-dimensional scanning …

Probing charge density in materials with atomic resolution in real space

C Addiego, W Gao, H Huyan, X Pan - Nature Reviews Physics, 2023 - nature.com
The charge distribution in materials at the nanoscale can often explain the origin of
macroscopic properties such as localized conductivity or the plasmonic response and …

Review of recent progress on in situ TEM shear deformation: a retrospective and perspective view

S Li, CA Powell, S Mathaudhu, B Gwalani… - Journal of Materials …, 2022 - Springer
Advances in the use of in situ transmission electron microscopy (TEM) to study mechanical
deformation have enabled a direct correlation of mechanical properties with microstructures …

Imaging the electron charge density in monolayer MoS2 at the Ångstrom scale

J Martis, S Susarla, A Rayabharam, C Su… - Nature …, 2023 - nature.com
Four-dimensional scanning transmission electron microscopy (4D-STEM) has recently
gained widespread attention for its ability to image atomic electric fields with sub-Ångstrom …

Map** 1D Confined Electromagnetic Edge States in 2D Monolayer Semiconducting MoS2 Using 4D-STEM

Y Wen, S Fang, M Coupin, Y Lu, C Ophus, E Kaxiras… - ACS …, 2022 - ACS Publications
Four-dimensional (4D) scanning transmission electron microscopy is used to study the
electric fields at the edges of 2D semiconducting monolayer MoS2. Sub-nanometer 1D …