Centers & Labs

Chief Scientist Laboratories

Condensed Molecular Materials Laboratory

Chief Scientist: Reizo Kato (D.Sci.)
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 Field


Related Research Fields

Mathematical and physical sciences

Functional solid state chemistry / Condensed matter physics II


  • Molecular Conductor
  • Metal
  • Semiconductor
  • Superconductivity

Selected Publications

  1. 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).
  2. 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).
  3. 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).
  4. 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).
  5. 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).
  6. 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).
  7. Kusamoto, T., Yamamoto, H. M., and Kato, R.:
    "Utilization of σ-Holes on Sulfur and Halogen Atoms for Supramolecular Cation・・・Anion Interactions in Bilayer Ni(dmit)2 Anion Radical Salts"
    Cryst. Growth Des. 13, 4533-4541 (2013).
  8. Tajima, N., Yamauchi, T., Yamaguchi, T., Suda, M., Kawasugi, Y., Yamamoto, H. M., Kato, R., Nishio, Y., and Kajita, K.:
    "Quantum Hall Effect in Multilayered Massless Dirac Fermion Systems with Tilted Cones"
    Phys. Rev. B 88, 075315/1-6 (2013).
  9. Watanabe, D., Yamashita, M., Tonegawa, S., Oshima, Y., Yamamoto, H. M., Kato, R., Sheikin, I., Behnia, K., Terashima, T., Uji, S., Shibauchi, T., and Matsuda, Y.:
    "Novel Pauli-Paramagnetic Quantum Phase in a Mott Insulator"
    Nature Commun. 3, 1090/1-6 (2012).
  10. Yamashita, S., Yamamoto, T., Nakazawa, Y., Tamura, M., and Kato, R.:
    "Gapless Spin Liquid of an Organic Triangular Compound Evidenced by Thermodynamic Measurements"
    Nature Commun. 2, 275/1-6 (2011).

Lab Members

Principal Investigator

Reizo Kato
Chief Scientist

Core Members

Masae Horinouchi
Senior Research Scientist
Shigeki Fujiyama
Senior Research Scientist
Yugo Oshima
Senior Research Scientist
Yoshitaka Kawasugi
Research Scientist
Hengbo Cui
Research Scientist
Yoshiaki Sato
Postdoctoral Researcher
Takayuki Isono
Postdoctoral Researcher
Masaharu Sato
Contract Researcher
Majed Abdel Jawad
Contract Researcher
Taehoon Lee
Junior Research Associate
Sunghyun Kim
Hiroshi Yamamoto
Senior Visiting Scientist
Naoya Tajima
Senior Visiting Scientist
Mitsushiro Nomura
Visiting Scientist
Masayuki Suda
Visiting Scientist
Kohei Ueda
Visiting Scientist
Takao Tsumuraya
Visiting Scientist

Contact information

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

Email: reizo [at]

Related links

Recent research results

January 20, 2017: RIKEN RESEARCH
New system for exploring superconductivity

Annual research report