This research was supported in part by National Natural Science Foundation of China (Grant Nos. 61401372, 61531016), Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20130182120017), Natural Science Foundation Project of CQ CSTC (Grant No. cstc2013jcyjA40040), Fundamental Research Funds for the Central Universities (Grant No. XDJK2015B023), and National Undergraduate Training Programs for Innovation and Entrepreneurship (Grant No. 201410635005).
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