1. State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology , Wuhan 430074 , China
2. School of Optical and Electronic Information, National Engineering Laboratory for Next Generation Internet Access System, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology , Wuhan 430074 , China
3. Gatan Inc. & EDAX LLC., AMETEK Commercial Enterprise (Shanghai) Co. , Ltd., Pilot Free Trade Zone, Shanghai 200131 , China
4. Department of Physics, The Chinese University of Hong Kong , Hong Kong 999077 , China