1. NanoScience Technology Center and Department of Physics, University of Central Florida, Orlando, Florida 32826,
United States
2. NanoScience Technology
Center, Department of Chemistry,
Department of Physics, and Florida Solar Energy Center, University of Central Florida, Orlando, Florida 32826,
United States
3. Theoretical
Division, Center for Nonlinear Studies
and Center for Integrated Nanotechnologies, Los Alamos National Laboratory, New Mexico 87545, United States