1. Department
of Physics and Astronomy, University of California, Irvine, California 92697, United States
2. Department
of Electrical and Computer Engineering, University of California, Santa
Barbara, California 93106, United States
3. Department
of Bioengineering, University of California, Irvine, California 92697, United States
4. Department
of Materials Science, GSI Helmholtz Center for Heavy Ion Research, Darmstadt, Germany
5. Oak Ridge National Laboratory, Bethel Valley Road, Oak Ridge, Tennessee 37831, United States
6. Department
of Chemistry, University of California, Irvine, California 92697, United States