1. Electrical Engineering and Computer Sciences, University of California, Berkeley, California 94720, United States
2. Materials
Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
3. Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, King Abdullah University of Science & Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
4. Department of Electrical Engineering, Institute
of Electronics Engineering, National Taiwan University, Taipei 10617, Taiwan, Republic of China
5. Sensors and Electron Devices Directorate, U.S. Army Research Laboratory, Adelphi, Maryland 20783, United States