1. School of Chemistry and Biochemistry, Georgia Institute of Technology, 901 Atlantic Drive, Atlanta, GA 30332, USA.
2. School of Materials Science and Engineering, Georgia Institute of Technology, North Avenue, Atlanta, GA 30332, USA.
3. Department of Physics and Center for Functional Materials, Wake Forest University, 1834 Wake Forest Road, Winston-Salem, NC 27109, USA.
4. Department of Chemistry, University of Houston, Houston, TX 77204, USA.
5. School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, GA 30332, USA.
6. Theoretical Division and Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
7. School of Physics, Georgia Institute of Technology, 837 State Street, Atlanta, GA 30332, USA.