1. College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, China
2. School of Microelectronics and State Key Laboratory for Mechanical Behaviour of Materials, Xi’an Jiaotong University, Xi’an 710049, China
3. School of Physical Science & Technology and Guangxi Key Laboratory for Relativistic Astrophysics, Guangxi University, Nanning 530004, China