1. Carl von Ossietzky Universität Oldenburg, Fakultät V, Institut für Physik, 26129 Oldenburg, Germany
2. Institute for Theoretical Physics and Bremen Center for Computational Material Science, University of Bremen, 28334 Bremen, Germany
3. University of Michigan, Department of Electrical Engineering and Computer Science, Ann Arbor, Michigan 48109, USA
4. Friedrich Schiller University Jena, Jena, Germany
5. Materials Science and Engineering, School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, Arizona 85287, USA
6. Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
7. International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
8. Depto. de Física de Materiales, Instituto Nicolás Cabrera, Instituto de Física de la Materia Condensada, Universidad Autónoma de Madrid, 28049 Madrid, Spain
9. Department of Physics, Stockholm University, 10691 Stockholm, Sweden