1. Integrated Center for Applied Physics and Photonic Materials, Institute of Applied Physics and Würzburg-Dresden Cluster of Excellence ct.qmat, Technische Universität Dresden, Dresden 01062, Germany
2. Department of Physics, University of Regensburg, Regensburg 93053, Germany
3. Department of Physics, Technical University of Munich, Garching 85748, Germany
4. Department of Physics, Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, United Kingdom
5. Tata Institute of Fundamental Research, 36/P, Gopanpally Village, Serilingampally Mandal, Hyderabad 500046, India
6. Institut für Physik and IRIS Adlershof, Humboldt-Universität zu Berlin, Berlin 12489, Germany
7. International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Ibaraki 305-004, Japan
8. Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Ibaraki 305-004, Japan