1. Institute for Functional Intelligent Materials National University of Singapore Singapore 117544 Singapore
2. Department of Materials Science and Engineering National University of Singapore Singapore 117575 Singapore
3. Institute for Condensed Matter Physics and Complex Systems School of Physics and Astronomy The University of Edinburgh Edinburgh EH9 3FD United Kingdom
4. Materials Science Division Argonne National Laboratory Lemont IL 60439 USA
5. Applied Physics Program Northwestern University Evanston IL 60208 United States
6. Department of Materials Science and Engineering Northwestern University Evanston Illinois 60208 USA
7. School of Materials Science and Engineering Nanyang Technological University Singapore 639798 Singapore
8. CINTRA CNRS/NTU/THALES, UMI 3288, Research Techno Plaza Nanyang Technological University Singapore Singapore
9. Higgs Centre for Theoretical Physics The University of Edinburgh Edinburgh EH9 3FD United Kingdom