1. Institut
für Physik, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
2. Graduate School of Excellence Materials Science in Mainz, 55128 Mainz, Germany
3. Quantum
Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, United States
4. Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
5. Computer,
Electrical, and Mathematical Sciences and Engineering Division (CEMSE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Saudi Arabia
6. Erich Schmid
Institute of Materials Science, Austrian Academy of Sciences, A-8700 Leoben, Austria
7. School
of Natural Sciences, Far Eastern Federal University, 690950 Vladivostok, Russia
8. Physik-Department, Technische Universität München, 85748 Garching, Germany
9. Nanosystems Initiative Munich (NIM), Schellingstraße 4, 80799 München, Germany
10. Institut
für Festkörperphysik, Technische Universität Dresden, 01062 Dresden, Germany