1. Departments of Chemistry and Physics and Astronomy, University of California, Irvine, California 92697-2025, United States
2. Department of Physics, Tuskegee University, Tuskegee, Alabama 36088, United States
3. Theoretical Division, Center for Nonlinear Studies (CNLS), and Center for Integrated Nanotechnologies (CINT), Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
4. Departamento de Ciencia y Tecnologia, Universidad Nacional de Quilmes/CONICET, B1876BXD Bernal, Argentina
5. School of Chemistry, University of Leeds, Leeds LS2 9JT, United Kingdom
6. School of Mathematics, University of Bristol, Bristol BS8 1TW, United Kingdom
7. Department of Electrical and Computer Engineering, College of Engineering, Boston University, Boston, Massachusetts 02215, United States
8. Departamento de Química Física, Universidad de Murcia, Murcia 30100, Spain