1. Division of Physics and Applied PhysicsSchool of Physical and Mathematical SciencesNanyang Technological University 21 Nanyang Link Singapore 637371 Singapore
2. Department of ScienceSchool of TechnologyPandit Deendayal Petroleum University Gandhinagar 382007 India
3. Department of Electrical Engineering and Computer ScienceMassachusetts Institute of Technology Cambridge MA 02139 USA
4. Interdisciplinary Graduate SchoolNanyang Technological University 50 Nanyang Avenue Singapore 637371 Singapore
5. Department of PhysicsThe University of Warwick Coventry CV4 7AL UK
6. Centre of Excellence for Green Energy and Sensors SystemsIndian Institute of Engineering Science and Technology Shibpur Howrah 711103 India
7. School of Materials Science & EngineeringNanyang Technological University 50 Nanyang Ave Singapore 639798 Singapore