1. Department of Mathematics and Physics, Faculty of Science and Technology Kochi University Kochi‐shi, Kochi Japan
2. TOSA Innovative Human Development Programs Kochi University Kochi‐shi, Kochi Japan
3. Department of Metallurgy, Materials Science and Materials Processing, Graduate School of Engineering Tohoku University Sendai-shi, Miyagi Japan
4. Frontier Research Institute for Interdisciplinary Sciences Tohoku University Sendai-shi, Miyagi Japan
5. Department of Physics, College of Humanities and Sciences Nihon University Setagaya‐ku, Tokyo Japan