1. School of Physics and Engineering, Henan University of Science and Technology, Luoyang 471023, China
2. Department of Energy and Petroleum Engineering, University of Stavanger, Stavanger 4036, Norway
3. College of Physics & Engineering Technology, Xingyi Normal University for Nationalities, Xingyi 562400, China
4. National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China