ISSP - The institute for Solid State Physics

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Harada Group
Associate 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 ultrahigh energy resolution optics for soft X-ray emission and time-resolved spectroscopy.

High energy resolution soft X-ray angle resolved emission spectrometer constructed for University of Tokyo outstation beamline BL07LSU in SPring-8.
High order vibrational excitations of H2O observed by the high energy resolution soft X-ray emission spectrometer. The energy separation reflects the potential profile of hydrogen bonding. Using soft X-ray emission we confirmed the presence of a microheterogeneity in pure liquid water.

Research Subjects

  1. Electronic structure analysis of aqueous solutions to study microheterogeneity and interaction at solid-liquid interfaces
  2. Development of in situ soft X-ray spectroscopy for surface reaction of fuel cell catalysts, electrochemical reaction, photocatalytic reaction and functionality of metalloproteins
  3. Study on the origin and observation of elementary excitations (crystal field excitation, spinon, magnon, charge density wave, orbiton etc.) in strongly correlated materials like Mott insulators and novel high temperature superconductors.
  4. Basic study on ultrahigh energy resolution optics for soft X-ray emission and time-resolved spectroscopy