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FM: Fachverband Funktionsmaterialien

FM 19: Advanced Microscopy and Tomography for Functional Materials

FM 19.8: Talk

Thursday, March 12, 2026, 12:15–12:30, BEY/0E40

Characterising electron vortex beams inside crystalline materials via vorticity — •Christian Bick¹, Dorothee Hüser¹, Andrey Surzhykov^1,2, and Tobias Klein¹ — ¹Physikalisch-Technische Bundesanstalt, Braunschweig, Germany — ²Technische Universität Braunschweig, Braunschweig, Germany

Convergent electron beams with an orbital angular momentum (OAM), also known as electron vortex beams or twisted electrons, have been investigated for multiple applications in material science. Recently, first measurements of vortex electron magnetic circular dichroism (EMCD) in the electron microscope have been reported.

We present a simulation-based study on vortex beam behaviour inside crystalline material utilising vorticity as a local property to characterise the beam. This quantity, which is widely used in fluid mechanics, can be understood as a local measure of OAM . We relate it to commonly used integrated quantities like the total OAM and channelling strength in order to further the understanding of the beams behaviour inside of model crystals and discuss possible measurements.

Keywords: electron vortex beams; transmission electron microscopy; orbital angular momentum; vorticity; elastic electron scattering