国家自然科学基金31172438和U1205123;福建省自然科学基金2012J06008,201311180002和2014J05042;教育部留学回国人员科研启动金资助[Supported by the National Natural Science Foundation of China.31172438 and U1205123;the Natural Science Foundation of Fujian Province.2012J06008,201311180002 and 2014J05042;the Projects-sponsored by SRF,for ROCS,SEM]