1. Department
of Chemical Physics and ‡Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot,
76100 Israel
2. Institute
of Nanotechnology, ∥Steinbuch Centre for Computing, and ⊥Institut Für Theorie der
Kondensierten Materie, Karlsruhe Institute of Technology (KIT), 76128 Karlsruhe, Germany