1. Sustainable Electronic Technologies, Electronics and Computer Science, Faculty of Physical Sciences and Engineering, University of Southampton, SO17 1BJ, U.K.
2. Department of Physics, Waseda University, Shinjuku, Tokyo 169-8555, Japan
3. Department of Electrical and Computer Engineering, National Institute of Technology, Gifu College, Motosu, Gifu 501-0495, Japan
4. Smart Electronic Materials and Systems, Electronics and Computer Science, Faculty of Physical Sciences and Engineering, University of Southampton, SO17 1BJ, U.K.
5. Research & Development Group, Hitachi, Ltd., Kokubunji, Tokyo 185-8601, Japan