1. Department of Mathematical Physical and Computer Sciences University of Parma Parco Area delle Scienze 7/A 43124 Parma Italy
2. IMEM‐CNR Parco Area delle Scienze 37/A 43124 Parma Italy
3. Centre for Energy Research Hungarian Academy of Sciences Institute for Technical Physics and Materials Science P.O. Box 49 H‐1525 Budapest Hungary
4. Department of Chemistry Life Sciences and Environmental Sustainability University of Parma Parco Area delle Scienze 17/A 43124 Parma Italy
5. Shared Instrumentation Facility Colorado School of Mines Golden Golden CO 80401 USA
6. Paul‐Drude‐Institut für Festkörperelektronik Leibniz‐Institut im Forschungsverbund Berlin e.V. Hausvogteiplatz 5–7 10117 Berlin Germany
7. Institute of Solid State Physics Technische Universität Berlin Hardenbergstr. 36 10623 Berlin Germany
8. Fraunhofer IAF Fraunhofer Institute for Applied Solid State Physics 79108 Freiburg im Breisgau Germany