1. Institute of Condensed Matter and Nanosciences (IMCN), Université catholique de Louvain (UCL), Chemin des Etoiles 8, bte L7.03.01, 1348 Louvain-la-Neuve, Belgium
2. Center for Nanophase Materials Sciences and ▽Computer Science & Mathematics Division, Oak Ridge National Laboratory, One Bethel Valley Road, Oak Ridge, Tennessee 37831-6367, United States
3. Departamento de Química Física and Unidad Asociada CSIC, Universidad de Vigo, 36310 Vigo, Spain
4. IPICYT, Camino a la presa San José 2055, 78216 San Luis Potosí, Mexico
5. Research Center for Exotic Nanocarbons, Shinshu University, Wakasato 4-17-1, Nagano-city 380-8553, Japan
6. Department of Physics and Materials Research Institute, The Pennsylvania State University, 104 Davey Lab., University Park, Pennsylvania 16802-6300, United States
7. Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, 110 Eighth Street, Troy, New York 12180-3590, United States