title: Bloch wave symmetries in electron diffraction: applications to Friedels law, Gjonnes-Moodie lines and refraction at interfaces.
abstract: We classify the point symmetries at the different points in the Brillouin zone for the 17 two-dimensional space groups and the symmetries of the Bloch waves for the 10 two-dimensional crystallographic point groups. Simple examples involving breakdown of Friedels law, Gjonnes-Moodie lines, and reflection and refraction at interfaces are presented.
authors.affiliation: Department of Physics, University of Oslo, Blindern, P.O. Box 1048, 0316 Oslo, Norway. kjetil.valset@fys.uio.no
authors.forename: K
authors.initials: K
authors.lastname: Valset
authors.forename: J
authors.initials: J
authors.lastname: Tafto
mesh_terms: D003461:Crystallography / Q000379:methods; D004583:Electrons; D046529:Microscopy, Electron, Transmission / Q000379:methods*; D008962:Models, Theoretical; D014961:X-Ray Diffraction