1. Department of Physics University of Hamburg D‐20355 Hamburg Germany
2. Multiscale Computational Materials Facility Key Laboratory of Eco‐materials Advanced Technology College of Materials Science and Engineering Fuzhou University Fuzhou 350108 P. R. China
3. Department of Physics and Astronomy Interdisciplinary Nanoscience Center (iNANO) Aarhus University C 8000 Aarhus Denmark