1. School of Physics and Materials Science, Radiation Detection Materials & Devices Lab, Anhui University, Hefei 230039, P.R. China
2. National Laboratory for Infrared Physics, Chinese Academy of Sciences, Shanghai Institute of Technical Physics, 500
Yutian Road, Shanghai 200083, P.R. China
3. Department of Physics, The University of Memphis, 216 Manning Hall, Memphis, Tennessee 38152-3390, United States