1. School of Physical Science and Technology, Guangxi Normal University, Guilin 541004, China
2. Physics Division, National Center for Theoretical Sciences, Hsinchu 30013, Taiwan
3. Department of Physics and Center for Theoretical Physics, National Taiwan University, Taipei 10617, Taiwan
4. Institute of Electromagnetics and Acoustics and Key Laboratory of Electromagnetic Wave Science and Detection Technology, Xiamen University, Xiamen 361005, China
5. School of Physical Science and Technology, and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China