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

Mendis, B.G.

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Abstract

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 Bragg beam set ups.

Citation

Mendis, B. (2023). Coherent electron Compton scattering and the non-diagonal electron momentum density of solids. Ultramicroscopy, 245, https://doi.org/10.1016/j.ultramic.2022.113664

Journal Article Type Article
Acceptance Date Dec 17, 2022
Online Publication Date Dec 22, 2022
Publication Date 2023-03
Deposit Date Jan 6, 2023
Publicly Available Date Jan 6, 2023
Journal Ultramicroscopy
Print ISSN 0304-3991
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 245
DOI https://doi.org/10.1016/j.ultramic.2022.113664

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