1. Key Laboratory for Precision and Non-traditional Machining Technology of the Ministry of Education, Dalian University of Technology, Dalian 116024, China
2. School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, United States
3. Department of Physics, Northwestern Polytechnical University, Xi’an 710072, China
4. Department of Material Science and Engineering, Frederick Seitz Material Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States