1. Center of Single‐Molecule Sciences Institute of Modern Optics Frontiers Science Center for New Organic Matter College of Electronic Information and Optical Engineering Nankai University 38 Tongyan Road, Jinnan District Tianjin 300350 P. R. China
2. School of Physics Institute for Quantum Science and Engineering and Wuhan National High Magnetic Field Center Huazhong University of Science and Technology Wuhan 430074 P. R. China
3. Network for Computational Nanotechnology Purdue University West Lafayette IN 47907 USA
4. Center of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials Institute of Polymer Chemistry College of Chemistry Nankai University Tianjin 300071 P. R. China
5. Beijing National Laboratory for Molecular Sciences National Biomedical Imaging Center College of Chemistry and Molecular Engineering Peking University 292 Chengfu Road, Haidian District Beijing 100871 P. R. China