1. INRS−Énergie,
Matériaux et Télécommunications, Université du Québec, 1650 Boulevard
Lionel-Boulet, Varennes (QC), J3X 1S2, Canada
2. Department of Materials
Science and Engineering, McMaster University, 1280 Main Street W. Hamilton ON, L8S 4L7, Canada
3. School of Science, Minzu University of China, Beijing 100081,
People’s Republic of China
4. Institute of Physics, Chinese Academy of Sciences, Beijing
100190, People’s Republic of China
5. Division of Solid
State Physics, Lund University, Lund, 22100, Sweden