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GaN atomic electric fields from a segmented STEM detector: Experiment and simulation
Tim Grieb1, Florian F Krause1, Thorsten Mehrtens1
1Institute of Solid State Physics, University of Bremen, Bremen, Germany.
Abstract:
Atomic electric fields in a thin GaN sample are measured with the centre-of-mass approach in 4D-scanning transmission electron microscopy (4D-STEM) using a 12-segmented STEM detector in a Spectra 300 microscope. The electric fields, charge density and potential are compared to simulations and an experimental measurement using a pixelated 4D-STEM detector. The segmented detector benefits from a high recording speed, which enables measurements at low radiation doses. However, there is measurement uncertainty due to the limited number of segments analysed in this study.
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