1. Shenzhen Engineering Laboratory of Phosphorene and Optoelectronics; Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province; College of Optoelectronic Engineering; Shenzhen University; Shenzhen 518060 China
2. Faculty of Information Technology; Macau University of Science and Technology; Macao 999078
3. College of Electronic Science and Technology; Shenzhen University; Shenzhen Guangdong 518060 P. R. China
4. Shandong Provincial Key Laboratory of Optics and Photonic Device; School of Physics and Electronics; Shandong Normal University; Jinan 250014 China