Centers & Labs

Chief Scientist Laboratories

Computational Condensed Matter Physics Laboratory

Chief Scientist: Seiji Yunoki (D.Eng.)
Seiji  Yunoki(D.Eng.)

Our main aim is to theoretically understand various novel quantum phases and phenomena in a wide range of materials by microscopically studying their electronic structures. One of our main interests includes strongly correlated electron systems such as different kinds of transition metal oxides and low-dimensional organic conductors. Using various state-of-the-art numerical methods, we study the novel ground states, low-lying collective excitations, and quantum transport properties in these systems. We are also very much interested in applying variational Monte Carlo method and density matrix renormalization group method to search a possible new spin liquid in two spatial dimensions and study the topological properties (such as quantum entanglement) of various topological ordered states including spin liquids. We are also eager to develop new numerical methods for quantum many-body systems in general.

Main Research Field

Physics

Related Research Fields

Materials Sciences

Research Subjects

  • Quantum states and quantum dynamics in strongly correlated systems
  • Qunatum liquid states in quantum spin systems
  • New numerical methods for strongly correlated quantum many-body systems

Selected Publications

  1. Otsuka, Y., Yunoki, S., Sorella, S.:
    “Universal quantum criticality in the metal-insulator transition of two-dimensional interacting Dirac elctrons”
    Phys. Rev. X 6, 011029 (2016).
  2. Hikino, S. and Yunoki, S.:
    “Magnetizaion induced by odd-frequency spin-triplet Cooper pairs in a Josephson junction with metallic trilayers”
    Phys. Rev. B 92, 024512 (2015).
  3. Sato, T., Shirakawa, T., and Yunoki, S.:
    “Spin-orbit-induced exotic insulators in a three-orbital Hubbard model with (t2g)5 electrons”
    Phys. Rev. B 91, 125122 (2015)
  4. Sota, S., Yunoki, S., and Tohyama, T.:
    “Density-matrix renormalization group study of third harmonic generation in one-dimensional Mott insulator coupled with phonon”
    J. Phys. Soc. Jpn. 84, 054403 (2015).
  5. Hikino, S., and Yunoki, S.:
    “0-pi transition driven by magnetic proximity effect in a Josephson junction”
    J. Phys. Soc. Jpn. 84, 024712 (2015).
  6. Mazzola, G., Yunoki, S., and Sorella, S.:
    “Unexpectedly high pressure for molecular dissociation in liquid hydrogen by electric simulation”
    Nature Communications 5, 3487 (2014).
  7. Annadi, A., Zhang, Q., Renshaw Wang, X., Tuzla, N., Copinadhan, K., Lu, W. M., Roy Barman, A., Liu, Z. Q., Srivastava A., Saha, S., Zhao, Y. L., Zeng, S. W., Dhar, S., Olsson, E., Gu, B., Yunoki, S., Maekawa, S., Hilgenkamp, H., Venkatesan, T., and Ariando A.:
    “Anisotropic two-dimensional electron gas at the LaAlO3/SrTiO3 (110) interface”
    Nature Communications 4, 1838 (2013).
  8. Hikino, S., and Yunoki, S.:
    “Long-range spin current driven by superconducting phase difference in a Josephson junction with double layer ferromagnets”
    Phys. Rev. Lett. 110, 237003 (2013).
  9. Sun, Y., Zhong, Z., Shirakawa, T., Franchini, C., Li, D., Li, Y., Yunoki, S., and Chen, X.-Q.:
    “Rock-salt SnS and SnSe: Native Topological Crystalline Insulators”
    Phys. Rev. B 88, 235122 (2013).
  10. Sorella, S., Otsuka, Y., and Yunoki, S.:
    “Absence of a Spin Liquid Phase in the Hubbard Model on the Honeycomb Lattice”
    Scientific Reports 2, 992 (2012).

Lab Members

Principal Investigator

Seiji Yunoki
Chief Scientist

Core Members

Kazuhiro Seki
Special Postdoctoral Researcher
Akiko Masaki
Special Postdoctoral Researcher
Tatsuya Kaneko
Special Postdoctoral Researcher
Kazutaka Nishiguchi
Postdoctoral Researcher
Beom Hyun Kim
Contract Researcher
Qing Xie
International Program Associate
Florian Lange
International Program Associate

Contact information

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

Email: yunoki [at] riken.jp

Related links

Annual research report