Organic Complex Electron Systems Research Team

Team Leader

Reizo Kato

  • D.Sci.
  • Reizo Kato
  • Brief resume
    1984
    D.Sci., University of Tokyo
    1984
    Research Associate, Department of Chemistry, Faculty of Science, Toho University
    1988
    Lecturer, Department of Chemistry, Faculty of Science, Toho University
    1990
    Associate Professor, Institute for Solid State Physics, University of Tokyo
    1999
    Chief Scientist, Condensed Molecular Materials, RIKEN (-current)
    2009
    Director, Advanced Technology Support Division, RIKEN
    2010
    Team Leader, Organic Complex Electron Systems Research Team, RIKEN (-current)

Outline

Organic Complex Electron Systems Research Team

Organic complex electrons form a variety of exotic systems that have clear electronic structures based on π-electrons. They are sensitive to external stimuli including pressure, light, magnetic fields and electric fields. Molecular degrees of freedom can be sources that afford novel properties in these condensed organic matters, and we may obtain a variety of chemical modifications. Based on these characteristics, our team is trying to design and develop novel organic π-electron systems with innovative functionalities, and reveal their fundamental principles.

Recent Research Topic

Crystal structure of molecular Dirac Fermion system α-(BEDT-TTF)2I3
Fig. 1: Crystal structure of molecular Dirac Fermion system α-(BEDT-TTF)2I3
Fig. 1
Reproduced, with permission, from N. Tajima, S. Sugawara, M. Tamura, Y. Nishio, K. Kajita, Electronic Phases in an Organic Conductor α-(BEDT-TTF)2I3: Ultra Narrow Gap Semiconductor, Superconductor, Metal, and Charge-Ordered Insulator, J. Phys. Soc. Jpn. 2006, 75, 051010. © (2012) Physical Society of Japan

Selected Publications

  1. T. Yamamoto, et al. Vibrational Spectra of [Pd(dmit)2] Dimer (dmit = 1,3-dithiole-2-thione-4,5-dithiolate): Methodology for Examining Charge, Inter-Molecular Interactions, and Orbital, J. Phys. Soc. Jpn. 2011, 80, 074717.
  2. S. Yamashita, T. Yamamoto, Y. Nakazawa, M. Tamura, R. Kato, Gapless Spin Liquid of an Organic Triangular Compound Evidenced by Thermodynamic Measurements, Nature Commun. 2011, 2, 275.
  3. K. Kanoda, R. Kato, Mott Physics in Organic Conductors with Triangular Lattices, Annu. Rev. Condens. Matter. Phys. 2011, 2, 167.
  4. T. Itou, A. Oyamada, S. Maegawa, R. Kato, Instability of a Quantum Spin Liquid in an Organic Triangular-Lattice Antiferromagnet, Nature Phys. 2010, 6, 673.
  5. M. Yamashita, et al. Highly Mobile Gapless Excitations in a Two-Dimensional Candidate Quantum Spin Liquid, Science, 2010, 328, 1246.
  6. N. Tajima, S. Sugawara, R. Kato, Y. Nishio, K. Kajita, Effect of the Zero-Mode Landau Level on Interlayer Magnetoresistance in Multilayer Massless Dirac Fermion Systems, Phys. Rev. Lett. 2009, 102, 176403.
  7. T. Itou, A. Oyamada, S. Maegawa, M. Tamura, R. Kato, 13C NMR Study of the Spin-Liquid State in the Triangular Quantum Antiferromagnet EtMe3Sb[Pd(dmit)2]2, J. Phys.: Conference Series 2009, 145, 012039.
  8. T. Itou, A. Oyamada, S. Maegawa, M. Tamura, R. Kato, Quantum Spin Liquid in the Spin-1/2 Triangular Antiferromagnet EtMe3Sb[Pd(dmit)2]2, Phys. Rev. B 2008, 77, 104413.
  9. N. Tajima, R. Kato, H. Taniguchi, Transport Properties of an Organic Mott Insulator β'-(BEDT-TTF)2ICl2, Europhys. Lett. 2008, 83, 27008.
  10. T. Yamamoto, et al. Inhomogeneous Site Charges at the Boundary between the Insulating, Superconducting, and Metallic Phases of β"-Type bis-ethylenedithio-tetrathiafulvalene Molecular Charge-Transfer Salts, Phys. Rev. B 2008, 77, 205120.
  11. N. Tajima, et al. Transport Properties of Massless Dirac Fermions in an Organic Conductor α-(BEDT-TTF)2I3 under Pressure, Europhys. Lett. 2007, 80, 47002.
  12. T. Yamamoto, et al. Technique for Anisotropic Extension of Organic Crystals: Application to Temperature Dependence of Electrical Resistance, Rev. Sci. Instrum. 2007, 78, 083906.
  13. T. Yamamoto, J. Eda, A. Nakao, R. Kato, K. Yakushi, Charge Ordered State and Frustration of Site Charges in (ET)5Te2I6 and (BETS)5Te2I6, Phys. Rev. B 2007, 75, 205132.

Core Members

Principal Investigator add delete
Reizo Kato Team Leader (Chief Scientist, Condensed Molecular Materials Laboratory)    
Staff Scientist add delete
Akira Furusaki  (Chief Scientist, Condensed Matter Theory Laboratory)    
Seiji Yunoki  (Associate Chief Scientist, Computational Condensed Matter Physics Laboratory)    
Hitoshi Seo Senior Research Scientist (Senior Research Scientist, Condensed Matter Theory Laboratory)    
Yugo Oshima Research Scientist (Research Scientist, Condensed Molecular Materials Laboratory)    
Postdoctoral Fellow add delete
Student Trainee add delete
Technical Assistant add delete
Administrative Assistant add delete
Visiting Research Staff add delete
Other Staff add delete

( ) indicates primary affiliation in RIKEN.

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