1. Faculty of Engineering Hokkaido University, Kita 13, Nishi 8, Sapporo 060-8628 Japan
2. Department of Electrical
and Electronic Engineering, Tokyo Metropolitan University, 1-1 minami-osawa, Hachioji, Tokyo 192-0397 Japan
3. Creative Research Institution Hokkaido University, Kita 21, Nishi 10, Sapporo 001-0021, Japan
4. Center for Crystal
Science and Technology, University of Yamanashi, 7-32 Miyamae, Kofu 400-8511, Japan
5. Department of Physical Science, Hiroshima University, 1-3-1 Kagamiyama, Higashihiroshima, Hiroshima 739-8526, Japan