| Affiliation: | 1. State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing, China;2. Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education and Department of Applied Physics, School of Science, Northwestern Polytechnical University, Xi'an, China;3. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, China;4. Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, IA, USA;5. Institute of Electronic Structure and Lasers (IESL), FORTH, Heraklion, Crete, Greece |
