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Atomic electric fields revealed by a quantum mechanical approach to electron picodiffraction
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Atomic electric fields revealed by a quantum mechanical approach to electron picodiffraction
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Journal Article
Atomic electric fields revealed by a quantum mechanical approach to electron picodiffraction
2014
Overview
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 SrTiO
3
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.
Advances in electron microscopy are enabling ever smaller features to be probed, with the measurement of atomic electric fields standing as a major challenge. Towards that aim, Müller
et al.
present a simplified theoretical approach for enhancing the resolution in differential phase contrast microscopy.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Pub. Group
