1. Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education& Hunan Provincial Key Laboratory of Low‐Dimensional Structural Physics and Devices School of Physics and Electronics Hunan University Changsha 410082 P. R. China
2. Hunan Key Laboratory for Super Microstructure and Ultrafast Process School of Physics and Electronics Central South University Changsha 410083 P. R. China
3. Science and Technology on Monolithic Integrated Circuits and Modules Laboratory Nanjing 210016 P. R. China
4. State Key Laboratory for Chemo/Biosensing and Chemometrics College of Semiconductors (College of Integrated Circuits) Hunan University Changsha 410082 P. R. China