1. Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education and Hunan Provincial Key Laboratory of Low‐Dimensional Structural Physics and Devices, School of Physics and Electronics Hunan University Changsha China
2. Department of Physics and Astronomy Clemson Nanomaterials Institute, Clemson University Clemson South Carolina
3. Department of Chemistry Missouri University of Science and Technology Rolla Missouri
4. Department of Materials Science and Engineering Missouri University of Science and Technology Rolla Missouri