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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

Ryusuke Hamazaki (Ph.D.)

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.:
    "Speed Limits for Macroscopic Transitions,"
    PRX Quantum 3, 020319 (2022).
  • 2. Hamazaki, R.:
    "Exceptional dynamical quantum phase transitions in periodically driven systems,"
    Nat. Commun. 12, 5108 (2021).
  • 3. Fujimoto, K., Hamazaki, R., and Kawaguchi, Y.:
    "Dynamical Scaling of Surface Roughness and Entanglement Entropy in Disordered Fermion Models,"
    Phys. Rev. Lett. 127, 090601 (2021).
  • 4. Sugimoto, S., Hamazaki, R., and Ueda, M.:
    "Test of Eigenstate Thermalization Hypothesis Based on Local Random Matrix Theory,"
    Phys. Rev. Lett. 126, 120602 (2021).
  • 5. Gong, Z., Yoshioka, N., Shibata, N., and Hamazaki, R.:
    "Universal Error Bound for Constrained Quantum Dynamics,"
    Phys. Rev. Lett. 124, 210606 (2020).
  • 6. Hamazaki, R., Kawabata, K., Kura, N., and Ueda, M.:
    "Universality classes of non-Hermitian matrices,"
    Phys. Rev. Research 2, 023286 (2020).
  • 7. *Hamazaki, R., Kawabata, K., and Ueda, M.:
    "Non-Hermitian Many-Body Localization"
    Phys. Rev. Lett. 123, 090603 (2019).
  • 8. *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]
  • 9. *Hamazaki, R. and Ueda, M.:
    "Atypicality of Most Few-Body Observables"
    Phys. Rev. Lett. 120, 080603 (2018).
  • 10. *Gong, Z., Hamazaki, R., and Ueda, M.:
    "Discrete Time-Crystalline Order in Cavity and Circuit QED Systems"
    Phys. Rev. Lett. 120, 040404 (2018).

Recent Research Results

Annual research report

Lab Members

Principal investigator

Ryusuke Hamazaki
RIKEN Hakubi Team Leader

Core members

Ken Mochizuki
Postdoctoral Researcher
Kaori Fukaya

Contact Information

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