1. Theoretical
Materials Physics, Q-MAT, CESAM, Université de Liège, B-4000 Sart Tilman, Belgium
2. School
of Materials Science and Engineering, Beijing University of Technology, Chaoyang
District, Beijing 100124, China
3. Physique
des Matériaux et Nanostructures, Q-MAT, CESAM, Université de Liège, B-4000 Sart Tilman, Belgium
4. Physics
Department and Institute for Nanoscience and Engineering, University of Arkansas, Fayetteville, Arkansas 72701, United States
5. Department of
Materials, Imperial College London, Exhibition Road, London, SW7 2AZ, United Kingdom
6. Molecular and
Biomolecular Physics Department, National Institute for Research and
Development of Isotopic and Molecular Technologies, RO-400293 Cluj-Napoca, Romania