1. Department of Physics, School of Science, Guangdong University of Petrochemical Technology, Maoming 525000, Guangdong, China
2. School of New Energy and Environmental Protection Engineering, Foshan Polytechnic, Foshan 528137, China
3. School of Physical Science and Technology, Guangxi University, Nanning 530004, China
4. Shenzhen Key Laboratory of Advanced Thin Films and Applications, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, State Key Laboratory of Radio Frequency Heterogeneous Integration, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China