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RIKEN Hakubi Research Teams Ultrashort Electron Beam Science RIKEN Hakubi Research Team

RIKEN Hakubi Team Leader: Yuya Morimoto (Ph.D.)

Research Summary

Yuya Morimoto (Ph.D.)

Electron beams are used for examples in electron microscopy and electron-beam lithography, where high spatial resolution is required. By using state-of-the-art laser and electron-beam technologies, we control the temporal structure of an electron beam with ultimate attosecond resolution and apply the controlled electron beams for imaging and controlling ultrafast chemical reactions. We explore the atomic-scale dynamics of electrons in a material which is the initial step of most photochemical reactions.

Main Research Fields

  • Chemistry

Related Research Fields

  • Engineering
  • Complex Systems
  • Interdisciplinary Science & Engineering
  • Mathematical & Physical Sciences
  • Physical chemistry
  • Optical engineering, Photon science
  • Atomic/Molecular/Quantum electronics


  • Ultrashort electron beam
  • Electron beam imaging
  • Nonlinear optics
  • Attosecond science
  • Atomic collisions

Selected Publications

Papers with an asterisk(*) are based on research conducted outside of RIKEN.

  • 1. *Morimoto, Y., Shinohara, Y., Tani, M., Chen, B.H., Ishikawa, K.L., and Baum, B.:
    "Asymmetric single-cycle control of valence electron motion in polar chemical bonds"
    Optica 8, 382 (2021).
  • 2. *Morimoto, Y., Hommelhoff, P., and Madsen, L.B.:
    "Coherent scattering of an optically modulated electron beam by atoms"
    Phys. Rev. A 103, 043110 (2021).
  • 3. *Morimoto, Y., and Hommelhoff, P.:
    "Intracycle interference in the interaction of laser and electron beams"
    Phys. Rev. Research 2, 043089 (2020).
  • 4. *Morimoto, Y., and Baum, P.:
    "Single-Cycle Optical Control of Beam Electrons"
    Phys. Rev. Lett. 125, 193202 (2020).
  • 5. *Chen, B.H., Wittmann, M., Morimoto, Y., Baum, P., and Riedle, E.:
    "Octave-spanning single-cycle middle-infrared generation through optical parametric amplification in LiGaS2"
    Opt. Exp. 27, 21306 (2019).
  • 6. *Morimoto, Y., and Baum, P.:
    "Attosecond control of electron beams at dielectric and absorbing membranes"
    Phys. Rev. A 97, 033815 (2018).
  • 7. *Morimoto, Y., and Baum, P.:
    "Diffraction and microscopy with attosecond electron pulse trains"
    Nat. Phys. 14, 252 (2018).
  • 8. *Morimoto, Y., Roland, I., Rennesson, S., Semond, F., Boucaud, P., and Baum, P.:
    "Laser damage of free-standing nanometer membranes"
    J. Appl. Phys. 122, 215303 (2017).
  • 9. *Ishida, K., Morimoto, Y., Kanya, R., and Yamanouchi, K.:
    "High-order multiphoton laser-assisted elastic electron scattering by Xe in a femtosecond near-infrared intense laser field: Plateau in energy spectra of scattered electrons"
    Phys. Rev. A 95, 023414 (2017).
  • 10. *Morimoto, Y., Kanya, R., and Yamanouchi, K.:
    "Light-Dressing Effect in Laser-Assisted Elastic Electron Scattering by Xe"
    Phys. Rev. Lett. 115, 123201 (2015).

Annual research report

Lab Members

Principal investigator

Yuya Morimoto
RIKEN Hakubi Team Leader

Contact Information

W521, 5F, Cooperation Center,
2-1 Hirosawa, Wako, Saitama 351-0198, Japan
Email: yuya.morimoto [at] riken.jp