Elucidation of electronic structure of solid surface by photoelectron spectroscopy and development
of functional thin films

The electronic states inside the bulk and at the surface of materials often exhibit different properties. We characterize the electronic states of bulk and thin film surfaces using various photoelectron spectroscopy techniques such as angle-resolved, spin-resolved, and spatially resolved techniques to develop new functional materials and to clarify the mechanism of exotic physical properties.

Introduction to Research

We developed "micro-ARPES system" that visualizes the spatial distribution of electronic states with high precision. We also elucidated the electron orbitals responsible for superconductivity in the Kagome lattice compound CsV3Sb5, by advanced electron spectroscopy measurement using synchrotron radiation. Our result provides an important guideline for designing materials with higher superconducting transition temperatures.

Objective

We elucidate the functionality of quantum materials, especially the mechanism of superconductivity, and develop materials exhibiting superconductivity at higher temperatures. We are currently developing a nano-spin ARPES system which can resolve spin-dependent electronic states with nanometer scale resolution.

Publications

Phys. Rev. Lett. 129, 206402, 2022.

Rev. Sci. Instrum. 93, 033906, 2022.