Abstract
This work studies the elastic scattering behavior of electron vortices when propagating through amorphous samples. A formulation of the multislice approach in cylindrical coordinates is used to theoretically investigate the redistribution of intensity between different angular momentum components due to scattering. To corroborate and elaborate on our theoretical results, extensive numerical simulations are performed on three model systems (Si3N4, Fe0.8B0.2, Pt) for a wide variety of experimental parameters to quantify the purity of the vortices, the net angular momentum transfer, and the variability of the results with respect to the random relative position between the electron beam and the scattering atoms. These results will help scientists to further improve the creation of electron vortices and enhance applications involving them.
Highlights
The study of electron vortex beams (EVBs) is a highly active field of research in the context of transmission electron microscopy (TEM)
We presented extensive simulations of the propagation of electron vortex beams through amorphous materials
We have rewritten the multislice approach in cylindrical coordinates to get some theoretical insight into the vortex propagation, such as the beam-size dependence of the redistribution of intensity between different m components and the possibility of net orbital angular momentum (OAM) transfer despite the fact that the probabilities for transferring Æmh- are equal
Summary
The study of electron vortex beams (EVBs) is a highly active field of research in the context of transmission electron microscopy (TEM). Despite the huge potential of EVBs and the fact that their creation and propagation through vacuum are well understood (Schattschneider & Verbeeck, 2011; Schattschneider et al, 2012; Schachinger et al, 2015), knowledge of their propagation through matter is still somewhat lacking. This is especially surprising since earlier studies showed that elastic scattering in crystals can drastically change the OAM of the beam (Loffler & Schattschneider, 2012; Xin & Zheng, 2012; Lubk et al, 2013)
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