1. Technische Physik, Wilhelm-Conrad-Röntgen-Research Center for Complex Material Systems, and Würzburg-Dresden Cluster of Excellence ct.qmat, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
2. Center for Theoretical Physics of Complex Systems, Institute for Basic Science (IBS), Daejeon 34126, Korea
3. Basic Science Program, Korea University of Science and Technology (UST), Daejeon 34113, Korea
4. Institute of Condensed Matter Theory and Optics Friedrich-Schiller-University Jena, Max-Wien-Platz 1, D-07743 Jena, Germany
5. Institute of Physics, University of Oldenburg, D-26129 Oldenburg, Germany
6. SUPA, School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, United Kingdom