We would like to thank our colleagues at CSSP of CCNU and Dr. Yang Wu now at the Academy of Marxism of Huazhong University of Science and Technology, for their kind support. Funding support came from the National Natural Science Foundation of China (31571147, 31400903) and Self-determined Research Funds of CCNU from the Colleges’ Basic Research and Operation of MOE Grants (CCNU18ZDPY12, CCNU15Z02001, CCNU14Z02015).
