1. Department of Advanced Materials Science, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
2. Department of Applied Physics, Okayama University of Science, Okayama 700-0005, Japan
3. The Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
4. AIST-UTokyo Advanced Operando-Measurement Technology Open Innovation Laboratory, National Institute of Advanced Industrial Science and Technology, Kashiwa, Chiba 277-8568, Japan