NSFCNational Natural Science Foundation of China (NSFC) [11301204, 11371159]; Ph.D. specialized grant of the Ministry of Education of ChinaMinistry of Education, China [20110144110001]; self-determined research funds of CCNU from the colleges' basic research and operation of MOE [CCNU14A05036]; excellent doctoral dissertation cultivation grant from Central China Normal University [2013YBZD15]
