1. Walker Department of Mechanical Engineering and Texas Materials Institute, The University of Texas at Austin, Austin, Texas 78712, United States
2. Photonics Initiative, Advanced Science Research Center, City University of New York, New York, New York 10031, United States
3. Department of Materials Science and Engineering, Department of Physics, Department of Chemistry, and Center for 2-Dimensional and Layered Materials, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
4. McKetta Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
5. School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China
6. Physics Program, Graduate Center, City University of New York, New York, New York 10016, United States