SAMOP 2023 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 2: Collisions, Scattering and Correlation Phenomena
A 2.1: Vortrag
Montag, 6. März 2023, 11:00–11:15, F107
Scattering of twisted electron wave packets by crystals — •Sophia Strnat1, 2, Dmitry Karlovets3, and Andrey Surzhykov1, 2 — 1Physikalisch-Technische Bundesanstalt, Braunschweig, Deutschland — 2Technische Universität Braunschweig, Braunschweig, Deutschland — 3Max-Planck-Institut für Kernphysik, Heidelberg, Deutschland
The transmission electron microscopes (TEM) is one of the main tools in material studies. Nowadays TEMs provide beam sizes down to the sub-angström scale [1]. Further, electron beams carrying non-zero angular momentum with energies up to few hundred keV can be produced. These so-called twisted electron beams posses a magnetic moment which allows for additional probing of magnetic properties of materials. We describe the twisted electrons as spacially localized wave packets to take the finite beam size in TEMs into account. In particular, we investigate the elastic scattering of a Bessel-Gaussian electron mode by graphene in a generalized Born approximation (developed in [2, 3]). We study the scattering of a 80 keV electron wave packet with a size ranging from 0.5 Å to 5 Å and show that a non-zero orbital angular momentum projection significantly alters the scattering pattern.
References
[1] P. E. Batson et al., Nature418,617-620 (2002)
[2] D. V. Karlovets et al., Phys. Rev. A 92, 052703 (2015)
[3] D. V. Karlovets et al., Phys. Rev. A 95, 032703 (2017)