* Corresponding authors

^a Laboratory of Clean Energy Technology, Changchun University of Science and Technology, Changchun 130022, China

^b Physics and HiPSEC, University of Nevada, Las Vegas, Nevada 89154, USA
E-mail: chen@physics.unlv.edu

^c Department of Materials Science, State Key Laboratory of Superhard Materials, and Key Laboratory of Automobile Materials of MOE, Jilin University, Changchun 130012, China
E-mail: liquan777@jlu.edu.cn