1. School of Science, East China University of Technology, Nanchang 330013, China
2. National Lab of Solid State Microstructures, Nanjing University, Nanjing 210093, China
3. Department of Physics, Jiangxi Science & Technology Normal University, Nanchang 330013, China
4. Center for Soft Condensed Matter Physics and Interdisciplinary Research, Soochow University, Suzhou 215006, China