1. Division of Physics and Applied Physics; School of Physical and Mathematical Sciences; Nanyang Technological University; 21 Nanyang Link 637371 Singapore
2. Energy Research Institute @ NTU (ERI@N); Research Techno Plaza; Level 5, 50 Nanyang Drive 639798 Singapore
3. IBM TJ Watson Research Center; Physical Sciences Department; 1101 Kitchawan Rd Yorktown Heights NY 10598 USA
4. Tokyo Ohka Kogyo Co. Ltd.; 150 Nakamaruko Nakahara-ku, Kawasaki Kanagawa 211-0012 Japan
5. Duke University; Durham NC 27708 USA