1. Physics Department, Federal University of São Carlos, São Carlos, SP 13565-905, Brazil
2. Institut für Experimentelle und Angewandte Physik, Universität Regensburg, D-93040 Regensburg, Germany
3. Institute for Theoretical Physics, University of Regensburg, D-93040 Regensburg, Germany
4. Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
5. Institute of Applied Physics and Würzburg-Dresden Cluster of Excellence ct.qmat, Technische Universität, 01069 Dresden, Germany
6. Instituto de Ciencia Molecular (ICMol), Universitat de València, Catedrático José Beltrán 2, Paterna 46980, Spain
7. Research Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan