1. School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, USA
2. Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, USA
3. New Memory Technology Lab, Semiconductor R&D Center, Samsung Electronics, Milpitas, California 95053,
USA
4. Platform Technology Laboratory, Samsung Advanced Institute of Technology (SAIT), Samsung Electronics, 130 Samsung-ro,
Yeongtong-gu, Suwon-si, Gyeonggi-do 16678, South Korea
5. Samsung Semiconductor R&D Center 1, Samsungjeonja-ro, Hwaseong-si, Gyeonggi-do 18448, South Korea
6. Kavli Institute at Cornell for Nanoscale Science, Ithaca, New York 14853, USA