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Chief Scientist Laboratories Condensed Molecular Materials Laboratory

Chief Scientist: Reizo Kato (D.Sci.)

Research Summary

Reizo  Kato(D.Sci.)

Synthesis, characterization and design of molecular materials, especially molecular metals ( superconductors ), have been undertaken. Molecular conductors exhibit a variety of physical properties which can be systematically understood on the basis of "simple" and "clear" electronic structures. From a chemical point of view, the most fascinating character of the molecular conductor is its "designability", that is, we can finely control solid state properties with chemical modifications of the molecule. The newly synthesized materials are characterized by the X-ray diffraction method and physical measurements (electrical conductivity, etc.). The electronic structure is investigated by the simple band structure calculation. All these results are devoted to the design of new molecular materials.

Main Research Fields

  • Chemistry

Related Research Fields

  • Mathematical & Physical Sciences
  • Functional solid state chemistry
  • Condensed matter physics II


  • Molecular Conductor
  • Metal
  • Semiconductor
  • Superconductivity

Selected Publications

  • 1. Kato, R., and Suzumura, Y.:
    "A Tight-binding Model of an Ambient-pressure Molecular Dirac Electron System with Open Nodal Lines"
    J. Phys. Soc. Jpn. 89, 044713, 1-5 (2020).
  • 2. Bourgeois-Hope, P., Laliberte, F., Lefrancois, E., Grissonnanche, G., Rene de Cotret, S., Gordon, R., Kitou, S., Sawa, H., Cui, H. B., Kato, R., Taillefer, L., and Doiron-Leyraud, N.:
    "Thermal Conductivity of the Quantum Spin Liquid Candidate EtMe3Sb[Pd(dmit)2]2: No Evidence of Mobile Gapless Excitations"
    Phys. Rev. X 9, 041051, 1-8 (2019).
  • 3. Kawasugi, Y., Seki, K., Tajima, S., Pu, J., Takenobu, T., Yunoki, S., Yamamoto, H. M., and Kato, R.:
    "Two-dimensional ground-state mapping of a Mott-Hubbard system in a flexible field-effect device"
    Science Advances, eaav7282, 1-9 (2019).
  • 4. Fujiyama, S. and Kato, R.:
    "Fragmented Electronic Spins with Quantum Fluctuations in Organic Mott Insulators Near a Quantum Spin Liquid"
    Phys. Rev. Lett. 122, 147204, 1-6 (2019).
  • 5. Kato, R., Cui, H. B., Tsumuraya, T., Miyazaki, T., and Suzumura, Y.:
    "Emergence of the Dirac Electron System in a Single-Component Molecular Conductor under High Pressure"
    J. Am. Chem. Soc. 139(5), 1770-1773 (2017).
  • 6. Kawasugi, Y., Seki, K., Edagawa, Y., Sato, Y., Pu, J., Takenobu, T., Yunoki, S., Yamamoto, H. M., and Kato, R.:
    "Electron-Hole Doping Asymmetry of Fermi Surface Reconstructed in a Simple Mott Insulator"
    Nat. Commun. 7, 12356/1-8 (2016).
  • 7. Ishikawa, T., Hayes, S. A., Keskin, S., Corthey, G., Hada, M., Pichugin, K., Marx, A., Hirscht, J., Shionuma, K., Onda, K., Okimoto, Y., Koshihara, S., Yamamoto, T., Cui, H. B., Nomura, M., Oshima, Y., Jawad, M. A., Kato, R., and Miller, R. J. D.:
    "Direct Observation of Collective Modes Coupled to Molecular Orbital-Driven Charge Transfer"
    Science, 350(6267), 1501-1505 (2015).
  • 8. Cui, H. B., Kobayashi, H., Ishibashi, S., Sasa, M., Iwase, F., Kato, R., and Kobayashi, A.:
    "A Single-Component Molecular Superconductor"
    J. Am. Chem. Soc. 136(21), 7619-7622 (2014).
  • 9.Kato, R.:
    "Development of π-Electron Systems Based on [M(dmit)2] (M= Ni and Pd; dmit: 1,3-dithiole-2-thione-4,5-dithiolate) Anion Radicals"
    Bull. Chem. Soc. Jpn. 87(3), 355-374 (2014).
  • 10.Yamamoto, H. M., Nakano, M., Suda, M., Iwasa, Y., Kawasaki, M., and Kato, R.:
    "A Strained Organic Field-Effect Transistor with a Gate-Tunable Superconducting Channel"
    Nature Commun. 4, 2379/1-7 (2013).

Recent Research Results

Annual research report

Related Links

Lab Members

Principal investigator

Reizo Kato
Chief Scientist

Core members

Shigeki Fujiyama
Senior Research Scientist
Yugo Oshima
Senior Research Scientist
Masae Horinouchi
Senior Research Scientist
Hengbo Cui
Research Scientist
Masashi Uebe
Postdoctoral Researcher
Hiroshi Yamamoto
Senior Visiting Scientist
Naoya Tajima
Senior Visiting Scientist
Kazuya Kubo
Visiting Scientist
Takashi Yamamoto
Visiting Scientist
Mitsushiro Nomura
Visiting Scientist
Masayuki Suda
Visiting Scientist
Kohei Ueda
Visiting Scientist
Takao Tsumuraya
Visiting Scientist
Yoshitaka Kawasugi
Visiting Scientist
Tetsuro Kusamoto
Visiting Scientist
Yumi Kuramitsu
Administrative Part-time Worker I

Contact Information

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