Funding for this research was provided by:
Division of Physics (No.2012CB316400)
National Natural Science Foundation of China (61572065, 61532005)
Fundamental Research Funds for the Central Universities (2015JBM028, 2015JBZ002)
PAPD
CICAEET
Article History
Received: 28 June 2016
Revised: 8 November 2016
Accepted: 3 January 2017
First Online: 13 January 2017