Influence of nuclear quantum effects on frozen phonon simulations of electron vortex beam HAADF-STEM images.
2016 (English)In: Ultramicroscopy, ISSN 0304-3991, E-ISSN 1879-2723, Vol. 164, 62-69 p.Article in journal (Refereed) Published
We have evaluated atomic resolution high-angle annular dark field images with ordinary beams and electron vortex beams for thin crystals of bcc iron, explicitly considering the atomic vibrations using molecular dynamics. The shape of the image representing an atomic column depends on the orbital angular momentum, sample thickness and temperature. For electron vortex beams we observe characteristic doughnut-shaped images of atomic columns. It is shown how the thermal diffuse scattering reduces the depth of their central minima, which get further smeared by finite source size effects. In addition, it is shown that in calculations of HAADF-STEM images at low temperatures one has to explicitly consider the nuclear quantum effects (zero point vibrations), otherwise the effect of atomic vibrations is strongly underestimated.
Place, publisher, year, edition, pages
2016. Vol. 164, 62-69 p.
Condensed Matter Physics
IdentifiersURN: urn:nbn:se:uu:diva-283343DOI: 10.1016/j.ultramic.2016.01.007ISI: 000373526200008PubMedID: 26852870OAI: oai:DiVA.org:uu-283343DiVA: diva2:918948
FunderSwedish Research CouncilThe Swedish Foundation for International Cooperation in Research and Higher Education (STINT)Göran Gustafsson Foundation for promotion of scientific research at Uppala University and Royal Institute of Technology