1. Department of Physics and Astronomy, University of Southern California, Los Angeles, California 90089, United States
2. Theoretical Division and Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
3. Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
4. Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
5. UNC Eshelman School of Pharmacy, University of North Carolina Chapel Hill, Chapel Hill, North Carolina 27599, United States