Nguyen Tuan Hung is an assistant professor at the Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Japan. He received a PhD through the Joint Program for Leading Graduate Schools of Tohoku University in March 2019, with a shortened period. He has been conferred the title of Tohoku University Prominent Research Fellow in 2021. Ahmad R. T. Nugraha is a researcher at the Research Center for Quantum Physics, National Research and Innovation Agency, Indonesia. He earned his MSc and DSc in physics from Tohoku University in 2010 and 2013, respectively. After being an assistant professor at Tohoku University, he moved permanently to Indonesia in 2019. He was awarded the LIPI Young Scientist Award, Indonesia, in 2019. Riichiro Saito is a professor at the Department of Physics, Tohoku University. He received his PhD from the University of Tokyo in 1985. He became a research associate at the University of Tokyo in 1985, an associate professor at the University of Electro-Communications in 1990, and a professor at Tohoku University in 2003. He was awarded the 18th Leo Esaki Prize, Japan, in 2021.