1. School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072
2. Center of Single-Molecule Sciences, Institute of Modern Optics, Frontiers Science Center for New Organic Matter, Tianjin Key Laboratory of Microscale Optical Information Science and Technology, College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300350
3. Network for Computational Nanotechnology, Purdue University, West Lafayette, Indiana 47907
4. Department of Applied Physics, School of Physics and Electronics, Hunan University, Changsha 410082
5. College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005
6. Beijing National Laboratory for Molecular Sciences, National Biomedical Imaging Center, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871