1. Institut für Physik, Humboldt-Universität zu Berlin, Newtonstrasse 15, D-12489 Berlin, Germany, Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, Institute of Solid State Physics, Graz University of Technology, Petersgasse 16, A-8010 Graz, Austria, Chair of Atomistic Modeling and Design of Materials, University of Leoben, Franz-Josef-Strasse 18, A-8700 Leoben, Austria, and School of Chemistry and Biochemistry...