1. Division of Physics and Applied Physics; School of Physical and Mathematical Sciences; Nanyang Technological University; 637371 Singapore
2. NOVITAS; Nanoelectronics Center of Excellence; School of Electrical and Electronic Engineering; Nanyang Technological University; 639798 Singapore
3. MajuLab; CNRS-UNS-NUS-NTU International Joint Research Unit; UMI 3654 Singapore