1. Department
of Applied Physics, Graduate School of Engineering, Nagoya University, Chikusa, Nagoya, Aichi 464-8603, Japan
2. Nanotube
Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8565, Japan
3. Department
of Quantum Engineering, Graduate
School of Engineering, Nagoya University, Chikusa, Nagoya, Aichi 464-8603, Japan
4. Toyota Physical and Chemical Research Institute, Nagakute, Aichi 480-1192, Japan