1. School of Mechanical Engineering, State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China
2. Advanced Research Center for Nanolithography (ARCNL), Science Park 106, 1098XG, Amsterdam, The Netherlands
3. Van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, Science Park 904, 1098XH, Amsterdam, The Netherlands
4. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China