1. Departments of Materials and Chemistry & Biochemistry, Center for Polymers and Organic Solids, University of California, Santa Barbara, California 93106, United States
2. Theoretical
Division, Center for Nonlinear Studies and Center for Integrated Nanotechnologies, Los Alamos National Laboratory, T-12, MS B268, Los Alamos, New Mexico 87545, United States
3. Advanced
Light Source, Lawrence Berkeley National Laboratory, 6 Cyclotron
Road, Berkeley, California 94720, United States