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RIKEN Center for Emergent Matter Science Strong Correlation Quantum Structure Research Group

Group Director: Takahisa Arima (Ph.D.)

Research Summary

Takahisa  Arima

Strongly correlated electron systems may exhibit various interesting emergent phenomena such as superconductivity, colossal magneto-resistance, and giant magneto-electric effects.  These emergent phenomena are directly associated with the spatial distributions as well as the spatial and temporal fluctuations of atoms, electron density, and spin density.  We are going to perform crystallographic and magnetic structure analyses, spectroscopies, and microscopies by using synchrotron x-rays, neutrons, and high-energy electron beams to reveal them.

Main Research Fields

  • Mathematical & Physical Sciences

Related Research Fields

  • Interdisciplinary Science & Engineering


  • x-ray
  • neutron
  • optical properties
  • multiferroics

Selected Publications

  • 1. V. Ukleev, O. Utesov, L. Yu, C. Luo, K. Chen, F. Radu, Y. Yamasaki, N. Kanazawa, Y. Tokura, T. Arima, J. S. White,
    "Signature of anisotropic exchange interaction revealed by vector-field control of the helical order in a FeGe thin plate",
    Phys. Rev. Research 3, 013094 (2021).
  • 2. Y. Ishii, K. Yamamoto, Y. Yokoyama, M. Mizumaki, H. Nakao, T. Arima, Y. Yamasaki,
    "Soft-X-ray Vortex Beam Detected by Inline Holography",
    Phys. Rev. Appl. 14, 064069 (2020).
  • 3. T. Nakajima, T. Oda, M. Hino, H. Endo, K. Ohishi, K. Kakurai, A. Kikkawa, Y. Taguchi, Y. Tokura, T. Arima,
    "Crystallization of magnetic skyrmions in MnSi investigated by neutron spin echo spectroscopy",
    Phys. Rev. Research 2, 043393 (2020).
  • 4. V. Ukleev, Y. Yamasaki, O., Utesov, K. Shibata, N. Kanazawa, N. Jaouen, H. Nakao, Y. Tokura, T. Arima,
    "Metastable solitonic states in the strained itinerant helimagnet FeGe",
    Phys. Rev. B 102, 014416 (2020).
  • 5. S. Gao, M. Hirschberger, O. Zaharko, T. Nakajima, T. Kurumaji, A. Kikkawa, J. Shiogai, A. Tsukazaki, S. Kimura, S. Awaji, Y. Taguchi, T. Arima, Y. Tokura,
    "Ordering phenomena of spin trimers accompanied by a large geometrical Hall effect",
    Phys. Rev. B 100, 241115(R) (2019).

Recent Research Results

Related Links

Lab Members

Principal investigator

Takahisa Arima
Group Director

Core members

Masaki Gen
Special Postdoctoral Researcher
Kamini Gautam
Postdoctoral Researcher

Contact Information

2-1 Hirosawa, Wako, Saitama 351-0198, Japan
Email: takahisa.arima [at] riken.jp