Centers & Labs

RIKEN Center for Emergent Matter Science

Computational Quantum Matter Research Team

Team Leader: Seiji Yunoki (D.Eng.)
Seiji  Yunoki(D.Eng.)

Materials exhibit a wide variety of properties including metal, semiconductor, magnetism, and superconductor. These different properties are caused by the different behavior of electrons inside materials. The main purpose of our research team is to microscopically understand a variety of quantum phenomena in solid materials using state-of-the-art numerical simulations. The electron in materials interacts with other electrons via Coulomb interaction, nuclei via electron-phonon interaction, and itself via spin-orbit interaction. We particularly focus on emergent quantum phenomena induced cooperatively by these interactions.

Main Research Field

Mathematical and physical sciences

Related Research Fields

Interdisciplinary science and engineering


  • Strongly correlated quantum systems
  • Transition metal oxides
  • Quantum dynamics

Selected Publications

  1. B. H. Kim, T. Shirakawa, and S. Yunoki,
    "From a quasimolecular band insulator to a relativistic Mott insulator in t2g5 systems with a honeycomb lattice structure",
    Physical Review Letters 117, 187201/1-6 (2016).
  2. Q. Cui, J.-G. Cheng, W. Fan, A. E. Taylor, S. Calder, M. A. McGuire, J.-Q. Yan, D. Meyers, X. Li, Y. Q. Cai, Y. Y. Jiao, Y. Choi, D. Haskel, H. Gotou, Y. Uwatoko, J. Chakhalian, A. D. Christianson, S. Yunoki, J. B. Goodenough, and J.-S. Zhou,
    "Slater insulator in iridate perovskites with strong spin-orbit coupling",
    Physical Review Letters 117, 176603/1-6 (2016).
  3. T. Shirakawa and S. Yunoki,
    "Density matrix renormalization group study in energy space for a single-impurity Anderson model and an impurity quantum phase transition",
    Physical Review B 93, 205124/1-17 (2016).
  4. H. Watanabe, K. Seki, and S. Yunoki,
    "Charge-density wave induced by combined electron-electron and electron-phonon interactions in 1T−TiSe2: A variational Monte Carlo study",
    Physical Review B 91, 205135/1-6 (2015).
  5. T. Sato, T. Shirakawa, and S. Yunoki,
    "Spin-orbit-induced exotic insulators in a three-orbital Hubbard model with (t2g)5 electrons",
    Physical Review B 91, 125122/1-5 (2015).
  6. T. Shirakawa and S. Yunoki,
    "Block Lanczos density-matrix renormalization group method for general Anderson impurity models: Application to magnetic impurity problems in graphene",
    Physical Review B 90, 195109/1-21 (2014).
  7. H. Watanabe, T. Shirakawa, and S. Yunoki,
    "Theoretical study of insulating mechanism in multiorbital Hubbard models with a large spin-orbit coupling: Slater vs. Mott scenario in Sr2IrO4",
    Physical Review B 89, 165115/1-13 (2014).
  8. H. Watanabe, T. Shirakawa, and S. Yunoki,
    "Monte Carlo study of an unconventional superconducting phase in Iridium oxide Jeff = 1/2 Mott insulators induced by carrier doping",
    Physical Review Letters 110, 027002/1-5 (2013).
  9. A. Annadi, Q. Zhang, X. Renshaw Wang, N. Tuzla, K. Gopinadhan, W. M. Lu, A. Roy Barman, Z. Q. Liu, A. Srivastava, S. Saha, Y. L. Zhao, S. W. Zeng, S. Dhar, E. Olsson, B. Gu, S. Yunoki, S. Maekawa, H. Hilgenkamp, T. Venkatesan, and A. Ariando,
    "Anisotropic two-dimensional electron gas at the LaAlO3/SrTiO3 (110) interface",
    Nature Communications 4, 1838/1-7 (2013).

Lab Members

Principal Investigator

Seiji Yunoki
Team Leader

Core Members

Tomonori Shirakawa
Research Scientist
Shohei Miyakoshi
Postdoctoral Researcher

Contact information

2-1 Hirosawa, Wako, Saitama 351-0198, Japan

Email: yunoki [at]

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