Coherent electron Compton scattering and the non-diagonal electron momentum density of solids.

Autor: Mendis BG; Department of Physics, Durham University, South Road, Durham DH1 3LE, UK. Electronic address: b.g.mendis@durham.ac.uk.
Jazyk: angličtina
Zdroj: Ultramicroscopy [Ultramicroscopy] 2023 Mar; Vol. 245, pp. 113664. Date of Electronic Publication: 2022 Dec 18.
DOI: 10.1016/j.ultramic.2022.113664
Abstrakt: Experimental techniques that probe the electronic structure of crystalline solids are vital for exploring novel condensed matter phenomena. In coherent Compton scattering the Compton signal due to interference of an incident and Bragg diffracted beam is measured. This gives the projected, non-diagonal electron momentum density of the solid, a quantity that is sensitive to both the amplitude and phase of the electron wavefunction. Here coherent electron Compton scattering is demonstrated using electron energy loss spectroscopy in the transmission electron microscope. The technique has several advantages over coherent X-ray Compton scattering, such as a superior spatial resolution and the use of smaller specimens to generate Bragg beams of sufficient intensity. The conditions for a directly interpretable coherent electron Compton signal are established. Results are presented for the projected, non-diagonal electron momentum density for silicon under 004 and 2¯20 Bragg beam set ups.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2022 The Author(s). Published by Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
Externí odkaz: