1. Lab of Optoelectronic Technology for Low Dimensional Nanomaterials School of Chemistry and Chemical Engineering University of South China Hengyang 421001 China
2. Shenzhen Engineering Laboratory of Phosphorene and Optoelectronics College of Phyiscs and Optoelectronic Engineering Shenzhen University Shenzhen 518060 China
3. School of Materials Science and Engineering Tongji University Shanghai 201804 China
4. Department of Physics and Astronomy Uppsala University Box 516 Uppsala SE‐751 20 Sweden