We thank Dr. Yujin Hori, Dr. Kouhei Kinugawa, Dr. Akihiro Imamura of Furukawa Electric Co. Ltd., Dr. Satoru Ouchi, Dr. Emiko Egaki of Panasonic Corporation, and Prof. Naoya Shibata of the University of Tokyo for valuable discussions. This research was partially supported by the Project for Promoting Public Utilization of the Advanced Research Infrastructure Grant from the Ministry of Education, Culture, Sports, Science, and Technology, and Japan Society for the Promotion of Science (JSPS), Grant-in-Aid for Scientific Research KAKENHI (JP 17H02792).
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