1. Department of Physics, University of California, Berkeley, CA 94720, USA.
2. Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
3. Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
4. NRCN, P.O. Box 9001, Beer Sheva, 84190, Israel.
5. National High Magnetic Field Laboratory, Tallahassee, FL 32310, USA.
6. Department of Materials Science and Engineering, University of California, Berkeley, CA 94720, USA.
7. Department of Physics and Astronomy, University of California, Los Angeles, Los Angeles, CA 90095, USA.