[1] Nano-Device Laboratory, Department of Electrical Engineering, University of California-Riverside, Riverside, CA 92521, United States
[2] A.M. Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow 119991, Russia
[3] Materials Science and Engineering Program, Bourns College of Engineering, University of California-Riverside, Riverside, CA 92521, United States
[4] Intel Corporation, Hillsboro, OR 97124, United States