1. Theoretical Division, Center for Nonlinear Studies (CNLS), and Center for Integrated Nanotechnologies (CINT), Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
2. Universidad Nacional de Quilmes, Roque Saenz Peña 352, B1876BXD Bernal, Argentina
3. Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, Michigan 48202, United States
4. Departments of Physics and Chemistry, Quantum Theory Project, University of Florida, Gainesville, Florida 32611, United States