1. Center for Programmed Centre; School of Materials Science and Engineering; Nanyang Technological University; 50 Nanyang Avenue Singapore 639798 Singapore
2. Materials Science and Technology Division; Oak Ridge National Lab; Oak Ridge TN 37831 USA
3. Department of Physics and Astronomy; Vanderbilt University; Nashville TN 37235 USA
4. NOVITAS; Nanoelectronics Centre of Excellence; School of Electrical and Electronic Engineering; Nanyang Technological University; 639798 Singapore
5. Center for Programmable Materials; School of Materials Science & Engineering; Nanyang Technological University; 50 Nanyang Avenue 639798 Singapore