1. College of Nano Science and Technology, Soochow University, 199 Ren-Ai Rd., Suzhou, Jiangsu 215123, China
2. Department of Physics and Engineering Physics, University of Saskatchewan, 116 Science Place, Saskatoon, Saskatchewan S7N 5E2, Canada
3. Institute of Metal Physics, Russian Academy of Sciences–Ural Division, 620990 Yekaterinburg, Russia
4. Ural Federal University, 620002 Yekaterinburg, Russia
5. Molecular Electronics and Photonics Research Unit, Department of Mechanical Engineering and Materials Science and Engineering, Cyprus University of Technology, Kitiou Kiprianou St. 45, 3603 Limassol, Cyprus