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Achieving sub-0.5-angstrom–resolution ptychography in an uncorrected electron microscope

https://doi.org/10.1126/science.adl2029

Nguyen, Kayla X.; Jiang, Yi; Lee, Chia-Hao; Kharel, Priti; Zhang, Yue; van der Zande, Arend M.; Huang, Pinshane Y. (February 2024, Science)

Subangstrom resolution has long been limited to aberration-corrected electron microscopy, where it is a powerful tool for understanding the atomic structure and properties of matter. Here, we demonstrate electron ptychography in an uncorrected scanning transmission electron microscope (STEM) with deep subangstrom spatial resolution down to 0.44 angstroms, exceeding the conventional resolution of aberration-corrected tools and rivaling their highest ptychographic resolutions. Our approach, which we demonstrate on twisted two-dimensional materials in a widely available commercial microscope, far surpasses prior ptychographic resolutions (1 to 5 angstroms) of uncorrected STEMs. We further show how geometric aberrations can create optimized, structured beams for dose-efficient electron ptychography. Our results demonstrate that expensive aberration correctors are no longer required for deep subangstrom resolution.
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Angstrom-scale imaging of magnetization in antiferromagnetic Fe2As via 4D-STEM

https://doi.org/10.1016/j.ultramic.2023.113696

Nguyen, Kayla X.; Huang, Jeffrey; Karigerasi, Manohar H.; Kang, Kisung; Cahill, David G.; Zuo, Jian-Min; Schleife, André; Shoemaker, Daniel P.; Huang, Pinshane Y. (May 2023, Ultramicroscopy)

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Lorentz electron ptychography for imaging magnetic textures beyond the diffraction limit

https://doi.org/10.1038/s41565-022-01224-y

Chen, Zhen; Turgut, Emrah; Jiang, Yi; Nguyen, Kayla X.; Stolt, Matthew J.; Jin, Song; Ralph, Daniel C.; Fuchs, Gregory D.; Muller, David A. (November 2022, Nature Nanotechnology)

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Detection Limits for Imaging Chiral Magnetic Materials with 4-Dimensional Lorentz Scanning Transmission Electron Microscopy

https://doi.org/10.1017/S1431927622006742

Zhang, Xiyue S; Nguyen, Kayla X; Turgut, Emrah; Chen, Zhen; Chang, Celesta S; Shao, Yu-Tsun; Fuchs, Gregory D; Muller, David A (August 2022, Microscopy and Microanalysis)

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Resolving Internal Magnetic Structures of Skyrmions by Lorentz Electron Ptychography

https://doi.org/10.1017/S1431927619000898

Chen, Zhen; Turgut, Emrah; Jiang, Yi; Nguyen, Kayla X.; Correa, Gabriela C.; Stolt, Matthew J.; Jin, Song; Ralph, Daniel C.; Fuchs, Gregory D.; Muller, David A. (August 2019, Microscopy and Microanalysis)

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Theory and practice of electron diffraction from single atoms and extended objects using an EMPAD

https://doi.org/10.1093/jmicro/dfx123

Cao, Michael C; Han, Yimo; Chen, Zhen; Jiang, Yi; Nguyen, Kayla X; Turgut, Emrah; Fuchs, Gregory D; Muller, David A (December 2017, Microscopy)

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Correlative imaging reveals physiochemical heterogeneity of microcalcifications in human breast carcinomas

https://doi.org/10.1016/j.jsb.2017.12.002

Kunitake, Jennie A.M.R.; Choi, Siyoung; Nguyen, Kayla X.; Lee, Meredith M.; He, Frank; Sudilovsky, Daniel; Morris, Patrick G.; Jochelson, Maxine S.; Hudis, Clifford A.; Muller, David A.; et al (April 2018, Journal of Structural Biology)

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