1. School of Information Science and Engineering, Harbin Institute of Technology at Weihai, Weihai 264209, China
2. National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Jiangsu Key Laboratory of Artificial Functional Materials, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210023, China
3. School of Science, Department of Optoelectronic Science, Harbin Institute of Technology at Weihai, Weihai 264209, China
4. Faculty of Physics and Center for Nanointegration (CENIDE), University of Duisburg-Essen, Duisburg 47057, Germany
5. Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, Beijing 100081, China