%0 Journal Article
%A Rotunno, E.
%A Tavabi, A. H.
%A Yucelen, E.
%A Frabboni, S.
%A Dunin-Borkowski, Rafal
%A Karimi, E.
%A McMorran, B. J.
%A Grillo, V.
%T Electron-Beam Shaping in the Transmission Electron Microscope: Control of Electron-Beam Propagation Along Atomic Columns
%J Physical review applied
%V 11
%N 4
%@ 2331-7019
%C College Park, Md. [u.a.]
%I American Physical Society
%M FZJ-2020-02666
%P 044072
%D 2019
%X We present a detailed analysis of the propagation of high-energy electron beams that have different shapes in a crystal of [100]-oriented zincblende GaN. Our study primarily focuses on Bessel beams and makes use of reformulated Bloch wave and multislice simulations. As a result of the simplicity of the momentum spectrum of a Bessel beam and the symmetry of the crystal, its propagation in the material can be described in a free-space representation, providing a deeper understanding of channeling phenomena and of probe intensity oscillation in the propagation direction. We also consider aperture-limited and Gaussian beams. The latter probes are shown to be optimal for coupling to 1s Bloch states and achieving minimal spreading along atomic columns.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000465185900006
%R 10.1103/PhysRevApplied.11.044072
%U https://juser.fz-juelich.de/record/878153