1. College of Electrical and Automation Engineering East China Jiaotong University Nanchang 330013 P. R. China
2. Zhejiang Provincial Key Laboratory for Cutting Tools Taizhou University Jiaojiang 318000, Zhejiang P. R. China
3. Institution of Physics Chinese Academy of Science No.8, 3rd South Street Zhongguancun, Haidian District 100190 P. R. China