1. Home
  2. Research
  3. Centers & Labs
  4. RIKEN Center for Emergent Matter Science

RIKEN Center for Emergent Matter Science Electronic States Spectroscopy Research Team

Team Leader: Kyoko Ishizaka (Ph.D.)

Research Summary

Kyoko  Ishizaka(Ph.D.)

We investigate spin, electron, and crystal structures of materials showing a variety of physical properties, functions, and quantum phenomena. We use spin- and angle-resolved photoemission spectroscopy, which can probe the energy, momentum, and spin of electrons in solids, to study new materials and phenomena such as superconductors, thermoelectric / spintronic materials, topological quantum states, and many-body effects in strongly correlated systems. We are also starting a project on the ultrafast time-resolved transmission electron microscope utilizing pulsed lasers. Dynamics of spin, electron, and crystal structures in nanometer and femto-nanosecond scales will be explored.

Main Research Fields

  • Mathematical & Physical Sciences

Related Research Fields

  • Interdisciplinary Science & Engineering


  • Photoemission Spectroscopy
  • Ultrafast TEM
  • Nano-scale magnetism
  • Superconductivity
  • Strongly correlated system

Selected Publications

  • 1. Asuka Nakamura, Takahiro Shimojima, and Kyoko Ishizaka.:
    "Characterizing an Optically Induced Sub-micrometer Gigahertz Acoustic Wave in a Silicon Thin Plate"
    Nano Lett. 23, 2490–2495 (2023).
  • 2. T. Shimojima, A. Nakamura, X. Z. Yu, K. Karube, Y. Taguchi, Y. Tokura, and K. Ishizaka.:
    "Nano-to-micro spatiotemporal imaging of magnetic skyrmion’s life cycle"
    Sci. Adv. 7, eabg1322/1-8(2021).
  • 3. A. Nakamura, T. Shimojima, Y. Chiashi, M. Kamitani, H. Sakai, S. Ishiwata, H. Li, and K. Ishizaka.:
    "Nanoscale Imaging of Unusual Photoacoustic Waves in Thin Flake VTe2"
    Nano Lett. 20, 7, 4932 (2020).
  • 4. N. Mitsuishi, T. Shimojima, K. Ishizaka et al.:
    "Switching of band inversion and topological surface states by charge density wave"
    Nature Commun. 11, 2466 (2020).
  • 5. T. Shimojima, Y. Suzuki, A. Nakamura, N. Mitsuishi, S. Kasahara, T. Shibauchi, Y. Matsuda, Y. Ishida, S. Shin and K. Ishizaka.:
    "Ultrafast nematic-orbital excitation in FeSe"
    Nature Commun. 10, 1946 (2019).

Recent Research Results

Related Links

Lab Members

Principal investigator

Kyoko Ishizaka
Team Leader

Core members

Asuka Nakamura
Research Scientist
Natsuki Mitsuishi
Postdoctoral Researcher

Contact Information

304-1, Frontier Research Laboratory
2-1 Hirosawa,
Wako, Saitama
351-0198, Japan
Email: kyoko.ishizaka [at] riken.jp