ISSP - The institute for Solid State Physics

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Professor

HARADA,
Yoshihisa

Research Associate

MIYAWAKI,
Jun

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We explore the origin of the electronic structure of materials responsible for their electronic, magnetic and optical property using intense and energy tunable X-ray source: SPring-8, one of the most brilliant synchrotron facilities in the world. We have developed novel spectroscopies for material science in ‘soft’ X-ray region. We are leading the world’s soft X-ray emission spectroscopy, a kind of light scattering promising for electronic structure analyses of liquids and operando spectroscopy of a variety of catalysts. Our topics include study on elementary excitations (crystal field excitation, spinon, magnon, charge density wave, orbiton etc.) in strongly correlated materials like Mott insulators and novel high-Tc superconductors, electronic structure analysis of aqueous solutions, interaction at solid-liquid interfaces, surface reaction of fuel cell catalysts, electronic structure analysis of reaction center in metalloproteins, electrochemical and photocatalytic reactions. We also explore basic study on high performance soft X-ray absorption and emission spectroscopy for the next generation synchrotron light source.

High energy resolution soft X-ray angle resolved emission spectrometer constructed for University of Tokyo outstation beamline BL07LSU in SPring-8.

Electronic structure of H₂O water in a polymer electrolyte brush observed by high energy resolution soft X-ray emission spectrometer. The X-ray emission profile is similar to crystalline ice I_h except for the 3a₁ derived state, indicating an ordered but uniformly distorted hydrogen bond network of water in the brush like ice even at room temperature. The distortion is induced by a local electric field present in the polymer brush.