1. Peter Grünberg Institute (PGI-9), Forschungszentrum Jülich, 52425 Jülich, Germany.
2. Helmholtz Virtual Institute for Topological Insulators (VITI), Forschungszentrum Jülich, 52425 Jülich, Germany.
3. JARA-Fundamentals of Future Information Technology, Jülich-Aachen Research Alliance, Forschungszentrum Jülich and RWTH Aachen University, Aachen, Germany.
4. JARA-FIT Institute Green IT, RWTH Aachen University, 52062 Aachen, Germany.
5. Physikalisches Institut EP3, University of Würzburg, Am Hubland 97070, Würzburg, Germany.
6. MESA+ Institute for Nanotechnology, University of Twente, 7500AE Enschede, The Netherlands.
7. Helmholtz Nano Facility (HNF), Forschungszentrum Jülich, 52425 Jülich, Germany.