1. Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan
2. Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Fukuoka 816-8580, Japan
3. Information and Communications Research Laboratories, Industrial Technology Research Institute, Hsinchu 31040, Taiwan
4. Institute of Communication Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
5. Department of Electrical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
6. Innovative Functional Materials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Nagoya 463-8560, Japan
7. Department of Materials Science and Engineering and Research Institute of Advanced Materials, Seoul National University, Seoul 151-742, Republic of Korea
8. Global Innovation Center (GIC), Kyushu University, Fukuoka 816-8580, Japan