1. Department of Physics, Beijing University of Aeronautics and Astronautics, Beijing 100191, People’s Republic of China, National Center for Electron Microscopy, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, USA, Fachbereich Physik and Center of Nanointegration (CeNIDE), Universität Duisburg-Essen, Lotharstr. 1, 47048 Duisburg, Germany, Universidad Autónoma de Nuevo León, Facultad de Ciencias Físico-Matemáticas, San Nicolás de los Garza, Nuevo León, México...