1. Institute of Applied Physics, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
2. Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa 32000, Israel
3. Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, 14109 Berlin, Germany
4. The Racah Institute of Physics, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
5. The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel