1. Key Laboratory of Materials Physics of Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou, Henan 450001, People’s Republic of China
2. School of Physics, Henan Normal University, Xinxiang, Henan 453007, People’s Republic of China
3. State Grid Henan Electric Power Research Institute, Zhengzhou, Henan 450052, People’s Republic of China
4. School of Physical Science and Technology, Southwest Jiaotong University, Chengdu, Sichuan 610031, People’s Republic of China