4D-STEM is capable of wide field-of-view (FOV) nano structural characterization with a spatial resolution on the order of 1 nm, giving users both strain and orientation information at the nanoscale in addition to whole-pattern diffraction analysis. This capability is available at both the Core and Gateway facilities.

Capabilities include:

• Gatan STEMx system.
• LBNL Patterned Probe aperture.
• Computational workflows (python and MATLAB) and high-RAM workstation.
• Gatan K2 direct electron detector (Core).
• Installed on the FEI ETEM microscope at CINT Core.
• Gatan OneView camera (Gateway).
• Installed on the Titan 80–300 microscope at CINT Gateway.

Contacts:
Stephen House (Core)
Matthew Schneider (Gateway)
Michael Pettes (Gateway)

Research Highlights:

Visualizing grain statistics in MOCVD WSe₂ through four-dimensional scanning transmission electron microscopy
Londoño-Calderon, A.; Dhall, R.; Ophus, C.; Schneider, M.; Wang, Y.; Dervishi, E.; Kang, H. S.; Lee, C.-H.; Yoo, J.; Pettes, M. T. Nano Letters 2022, 22, 2578–2585. doi.org/10.1021/acs.nanolett.1c04315

Evidence of intrinsic helical twist and chirality in ultrathin tellurium nanowires
Londoño-Calderon, A.; Williams, D. J.; Schneider, M. M.; Savitzky, B. H.; Ophus, C.; Ma, S.; Zhu, H.; Pettes, M. T. Nanoscale 2021, 13, 9606-9614. doi.org/10.1039/D1NR01442K

Local lattice deformation of tellurene grain boundaries by four-dimensional electron microscopy
Londoño-Calderon, A.; Williams, D. J.; Schneider, M.; Savitzky, B. H.; Ophus, C.; Pettes, M. T.  The Journal of Physical Chemistry C 2021, 125, 3396–3405. doi.org/10.1021/acs.jpcc.1c00308