We have developed measurement techniques for absorption spectroscopy, photoelectron spectroscopy, and nonlinear spectroscopy using vacuum ultraviolet rays to soft X-rays, generated from high-brilliant synchrotron radiation (SR) and X-ray lasers. We have focused on operando experiments to make in situ observations of a material during its operation. At the SR facility, we have realized photoelectron spectroscopy measurements under conditions from ultrahigh vacuum to ambient pressure, unveiling properties and functionalities of the model and actual systems (Figs. 1 and 2). Our instrumental developments are based on pioneering new measurement principles and, recently, they are combined with the AI robot technology. Our material targets are mainly monatomic layers with the exotic Dirac electrons and surface/interface systems of strongly correlated materials. Based on the fundamental theories and informatics, we design and synthesize novel materials while feeding back information using our precise measurement data. We aim to implement our functional materials in society.

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