-A A +A
The component of orbital angular momentum (OAM) in the propagation direction is one of the fundamental quantities of an electron wave function that describes its rotational symmetry and spatial chirality. Here, we demonstrate experimentally an electrostatic sorter that can be used to analyze the OAM states of electron beams in a transmission electron microscope. The device achieves postselection or sorting of OAM states after electron-material interactions, thereby allowing the study of new material properties such as the magnetic states of atoms. The required electron-optical configuration is achieved by using microelectromechanical systems technology and focused ion beam milling to control the electron phase electrostatically with a lateral resolution of 50 nm. An OAM resolution of 1.5 ℏ is realized in tests on controlled electron vortex beams, with the perspective of reaching an optimal OAM resolution of 1 ℏ in …
American Physical Society
Publication date: 
5 Mar 2021

Amir H Tavabi, Paolo Rosi, Enzo Rotunno, Alberto Roncaglia, Luca Belsito, Stefano Frabboni, Giulio Pozzi, Gian Carlo Gazzadi, Peng-Han Lu, Robert Nijland, Moumita Ghosh, Peter Tiemeijer, Ebrahim Karimi, Rafal E Dunin-Borkowski, Vincenzo Grillo

Biblio References: 
Volume: 126 Issue: 9 Pages: 094802
Physical Review Letters