Affiliation: | aData Storage Institute, A∗STAR (Agency for Science, Technology and Research), DSI Building, 5 Engineering Drive 1, Singapore 117608, Singapore;bComputational Nanoelectronics and Nano-device Laboratory, Electrical and Computer Engineering Department, National University of Singapore, 4 Engineering Drive 3, Singapore 117576, Singapore;cInformation Storage Materials Laboratory, Electrical and Computer Engineering Department, National University of Singapore, 4 Engineering Drive 3, Singapore 117576, Singapore;dDepartment of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore |