1. State Key Laboratory of Information Photonics and Optical Communications, School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, P. R. China
2. School of Science, Xi’an University of Architecture and Technology, Xi’an 710055, P. R. China
3. CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, P. R. China
4. Beijing Computational Science Research Center, Beijing 100193, P. R. China