1. Department of Materials Science and Engineering, National University of Singapore, Singapore 117575, Singapore
2. Programmable Functional Materials Lab, Center for Neurophysics and Neuromorphic Technologies, Moscow 127495, Russia
3. IMDEA Nanoscience, Faraday 9, Madrid 28015, Spain
4. Institute for Functional Intelligent Materials, National University of Singapore, Singapore 117575, Singapore
5. International Center for Materials Nanoarchitectonics, National Institute of Material Science, Tsukuba 305-0044, Japan
6. Research Center for Functional Materials, National Institute of Material Science, Tsukuba 305-0044, Japan
7. School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, U.K.
8. Donostia International Physics Center, Paseo Manuel de Lardizábal 4, San Sebastián 20018, Spain