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RIKEN Hakubi Research Teams Nonequilibrium Quantum Statistical Mechanics RIKEN Hakubi Research Team

RIKEN Hakubi Team Leader: Ryusuke Hamazaki (Ph.D.)

Research Summary

濱崎 立資

Bridging macroscopic nonequilibrium phenomena and microscopic theory of (quantum) mechanics is presumably one of the most profound problems in physics. In particular, the past decade has witnessed a rapid development on our understanding of how isolated quantum systems relax to thermal equilibrium under unitary time evolution. We are now interested in understanding and controlling richer nonequilibrium dynamics emergent in isolated or dissipative quantum many-body systems. Through nonequilibrium science, I would also like to contribute to interdisciplinary researches, such as biology and information theory as well as condensed matter theory.

Main Research Fields

  • Mathematical & Physical Sciences

Related Research Fields

  • Engineering
  • Informatics
  • Interdisciplinary Science & Engineering
  • Physics
  • Mathematical physics/ Fundamental condensed matter physics


  • Nonequilibrium science
  • Statistical mechanics
  • Quantum dynamics
  • Information theory
  • Quantum simulation

Selected Publications

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

  • 1.* Hamazaki, R., Kawabata, K., and Ueda, M.:
    "Non-Hermitian Many-Body Localization"
    Phys. Rev. Lett. 123, 090603 (2019).
  • 2.* Yoshioka, N. and Hamazaki, R.:
    "Constructing neural stationary states for open quantum many-body systems"
    Phys. Rev. B 99, 214306 (2019). [Editor’s Suggestion, Featured in Physics]
  • 3.* Fujimoto, K., Hamazaki, R., and Ueda, M.: "Flemish Strings of Magnetic Solitons and a Non-Thermal Fixed Point in a One-Dimensional Antiferromagnetic Spin-1 Bose Gas"
    Phys. Rev. Lett. 122, 173001 (2019).
  • 4.* Hamazaki, R. and Ueda, M.:
    "Random-matrix behavior of quantum nonintegrable many-body systems with Dyson’s three symmetries"
    Phys. Rev. E 99, 042116 (2019).
  • 5.* Hamazaki, R. and Ueda, M.:
    "Atypicality of Most Few-Body Observables"
    Phys. Rev. Lett. 120, 080603 (2018).
  • 6.* Fujimoto, K., Hamazaki, R., and Ueda, M.:
    "Unconventional Universality Class of One-Dimensional Isolated Coarsening Dynamics in a Spinor Bose Gas"
    Phys. Rev. Lett. 120, 073002 (2018).
  • 7.* Gong, Z., Hamazaki, R., and Ueda, M.:
    "Discrete Time-Crystalline Order in Cavity and Circuit QED Systems"
    Phys. Rev. Lett. 120, 040404 (2018).
  • 8.* Hamazaki, R., Ikeda, T.N., and Ueda, M.:
    "Generalized Gibbs ensemble in a nonintegrable system with an extensive number of local symmetries"
    Phys. Rev. E 93, 032116 (2016).

Annual research report

Lab Members

Principal investigator

Ryusuke Hamazaki
RIKEN Hakubi Team Leader

Contact Information

RIKEN Main Research Building 623
2-1 Hirosawa, Wako, Saitama 351-0198, Japan
Email: ryusuke.hamazaki [at] riken.jp