1. Institute of Condensed Matter and Nanosciences, Université Catholique de Louvain (UCLouvain), 1348 Louvain-la-Neuve, Belgium
2. Kavli Institute of Nanoscience, Delft University of Technology, 2628CJ Delft, The Netherlands
3. Max-Planck-Institut für Festkörperforschung, D-70569 Stuttgart, Germany
4. Nanomat/Q-MAT/ and European Theoretical Spectroscopy Facility, Université de Liège, B-4000, Liège, Belgium
5. Department of Chemistry, Columbia University, New York, New York 10027, United States
6. Research Center for Electronic and Optical Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
7. Research Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
8. ITP, Physics Department, Utrecht University, 3508 TA Utrecht, The Netherlands