Xian-Kui Wei is a staff scientist at Ernst Ruska-Centre (ER-C) for Microscopy and Spectroscopy with Electrons in Forschungszentrum Jülich, Germany. After receiving his Ph.D. degree from Institute of Physics, Chinese Academy of Sciences in 2011, he worked as a collaborator scientist/postdoc in Swiss Federal Institute of Technology Lausanne (EPFL) until 2016. His research interest focuses on atomic-scale light-element imaging and polar ultramicroscopy structure of ferroelectric oxides, catalysts, batteries, topological insulators as well as structure-property relationship.