1. The Institute of Chemistry and The Center for Nanoscience and Nanotechnology The Hebrew University of Jerusalem Jerusalem 91904 Israel
2. Physics Department Manhattan College Riverdale New York 10471 USA
3. The Zisapel Nano‐Electronics Center Department of Electrical Engineering Technion—Israel Institute of Technology Haifa 32000 Israel
4. Department of Material Science and Chemical Engineering Stony Brook University Stony Brook NY 11794 USA