1. School of Physics and Optoelectronics Engineering Xidian University Xi'an 710071 China
2. Laser Physics Centre, Research School of Physics Australian National University Canberra ACT 0200 Australia
3. Science Program Texas A&M University at Qatar Doha 23874 Qatar
4. Advanced Materials Engineering and Modelling Group Faculty of Chemistry Wroclaw University of Science and Technology Wyb. Wyspianskiego 27 Wroclaw 50‐370 Poland
5. Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education and International Center for Dielectric Research Xi'an Jiaotong University Xi'an 710049 China
6. Laboratory of Infrared Materials and Devices Research Institute of Advanced Technologies Ningbo University Ningbo Zhejiang 315211 China
7. Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China