1. Department of Mechanical Engineering, Columbia University, New York, New York 10027, United States
2. Sensors and Electron Devices Directorate, U.S. Army Research Laboratory, Adelphi, Maryland 20783, United States
3. General Technical Services LLC, Wall Township, New Jersey 07727, United States
4. National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
5. Samsung-SKKU Graphene/2D Center (SSGC), Department of Nano Science and Technology, SKKU Advanced Institute of Nano-Technology (SAINT), Sungkyunkwan University, Suwon 16419, Korea
6. Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University 637371, Singapore