Atomic electric fields revealed by a quantum mechanical approach to electron picodiffraction. Müller, K., Krause, F. F., Béché, A., Schowalter, M., Galioit, V., Löffler, S., Verbeeck, J., Zweck, J., Schattschneider, P., & Rosenauer, A. Nature Communications, 5(1):5653, December, 2014. Number: 1 Publisher: Nature Publishing Group![Atomic electric fields revealed by a quantum mechanical approach to electron picodiffraction [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex By focusing electrons on probes with a diameter of 50 pm, aberration-corrected scanning transmission electron microscopy (STEM) is currently crossing the border to probing subatomic details. A major challenge is the measurement of atomic electric fields using differential phase contrast (DPC) microscopy, traditionally exploiting the concept of a field-induced shift of diffraction patterns. Here we present a simplified quantum theoretical interpretation of DPC. This enables us to calculate the momentum transferred to the STEM probe from diffracted intensities recorded on a pixel array instead of conventional segmented bright-field detectors. The methodical development yielding atomic electric field, charge and electron density is performed using simulations for binary GaN as an ideal model system. We then present a detailed experimental study of SrTiO3 yielding atomic electric fields, validated by comprehensive simulations. With this interpretation and upgraded instrumentation, STEM is capable of quantifying atomic electric fields and high-contrast imaging of light atoms.
@article{muller_atomic_2014,
title = {Atomic electric fields revealed by a quantum mechanical approach to electron picodiffraction},
volume = {5},
copyright = {2014 The Author(s)},
issn = {2041-1723},
url = {https://www.nature.com/articles/ncomms6653},
doi = {10.1038/ncomms6653},
abstract = {By focusing electrons on probes with a diameter of 50 pm, aberration-corrected scanning transmission electron microscopy (STEM) is currently crossing the border to probing subatomic details. A major challenge is the measurement of atomic electric fields using differential phase contrast (DPC) microscopy, traditionally exploiting the concept of a field-induced shift of diffraction patterns. Here we present a simplified quantum theoretical interpretation of DPC. This enables us to calculate the momentum transferred to the STEM probe from diffracted intensities recorded on a pixel array instead of conventional segmented bright-field detectors. The methodical development yielding atomic electric field, charge and electron density is performed using simulations for binary GaN as an ideal model system. We then present a detailed experimental study of SrTiO3 yielding atomic electric fields, validated by comprehensive simulations. With this interpretation and upgraded instrumentation, STEM is capable of quantifying atomic electric fields and high-contrast imaging of light atoms.},
language = {en},
number = {1},
urldate = {2022-02-03},
journal = {Nature Communications},
author = {Müller, Knut and Krause, Florian F. and Béché, Armand and Schowalter, Marco and Galioit, Vincent and Löffler, Stefan and Verbeeck, Johan and Zweck, Josef and Schattschneider, Peter and Rosenauer, Andreas},
month = dec,
year = {2014},
note = {Number: 1
Publisher: Nature Publishing Group},
keywords = {Quantum mechanics, Transmission electron microscopy},
pages = {5653},
}
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