Visiting Professor

Professor HARADA Yoshihisa
Institute for Solid State Physics, The University of Tokyo
  • Electronic structure analysis of aqueous solutions to study microheterogeneity and interaction at solid-liquid interfaces
  • Development of in situ soft X-ray spectroscopy for the electronic structure analysis of battery materials, photocatalysts and metalloproteins
  • Study on the origin and observation of elementary excitations in strongly correlated materials
Soft X-ray spectroscopy, electronic structure, solution/colloid, solid-liquid interface, biophysical chemistry
Research Activities
We are developing new spectroscopic techniques using 'soft X-rays' to investigate the electronic structure responsible for the electrical, magnetic, and optical properties of materials. In particular, we have focused on the potential of soft X-ray emission spectroscopy or resonant soft X-ray inelastic scattering to directly observe elementary excitations (crystal field excitations, spin excitations, magnon excitations, charge density wave excitations, orbiton excitations, etc.) in strongly correlated materials such as Mott insulators and new high-Tc superconductors. Our research interests include the electronic states of aqueous solutions and solid-liquid interfaces responsible for their functions, observation of microheterogeneities in water and their origin, electronic structure analysis of oxygen reduction catalysts for fuel cells, electrode materials for lithium-ion batteries, photocatalytic materials, and metalloproteins. We are conducting research on all kinds of materials to which soft X-ray emission spectroscopy can be applied. In addition, we are conducting R&D experiments to improve the efficiency and energy resolution of soft X-ray absorption and emission spectroscopy for high-brilliance synchrotron radiation sources. In addition, we are conducting many joint researches with companies for society related researches. 
The various interests that emerge from particular research can open up new perspectives, which can be used as a bridge to jump into new research fields. I believe that knowing one's own interests and being able to expand the spectrum of one's interests from there are necessary qualities for a researcher.