1. Department of Materials Science and Engineering, University of California, Irvine, Irvine, California 92697-2585, United States
2. Department of Physics, University of California, Irvine, Irvine, California 92697-4575, United States
3. Department of Chemistry, University of California, Santa Barbara, Santa Barbara, California 93106, United States
4. Department of Computer Science, University at Albany-SUNY, 1400 Washington Avenue, Albany, New York 12222, United States
5. Department of Physics, University of California, Santa Barbara, Santa Barbara, California 93106, United States