1. Department of Chemistry, Columbia University, New York, New York 10027, United
States
2. Nanoscale Science
and Engineering
Center, Columbia University, New York,
New York 10027, United States
3. Department of Physics, Columbia University, New York, New York 10027, United
States
4. Department of Applied
Physics
and Applied Mathematics, and Materials Research Science and Engineering
Center, Columbia University, New York,
New York 10027, United States
5. Department of Chemical and Biological
Engineering, Tufts University, Medford,
Massachusetts 02155, United States
6. Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico
87545, United States