Wang, W. G.
Funding for this research was provided by:
National Natural Science Foundation of China (11604286, 51661032)
the Shaanxi Provincial Natural Science Foundation (15JK1833, 17JK0870)
Special project of Yan’an university institute of material physics research and High-level University Construction Special Program of Shaanxi Province (Physics-2012SXTS05)
Yan’an University National Natural Science Foundation (YD2015-07, YDBK2014-01)
the Shanxi Provincial College students’ innovative projects (1280)