Centers & Labs

RIKEN Center for Advanced Photonics

Quantum Optoelectronics Research Team

Team Leader: Yuichiro Kato (Ph.D.)
Yuichiro  Kato(Ph.D.)

Advances in device fabrication techniques have enabled integration of individual nanomaterials, where single electrons and single photons could be addressed. We exploit state-of-the-art nanofabrication technologies to develop and engineer optoelectronic devices with novel functionalities that can only be achieved by utilizing the quantum nature of electrons and photons at the nanoscale. We investigate devices that would allow for control over the interactions between electrons and photons at the quantum mechanical level, which would lead to quantum photon sources and optical-to-electrical quantum interfaces.

Main Research Field

Interdisciplinary science and engineering

Related Research Fields

Mathematical and physical sciences / Chemistry / Engineering


  • optoelectronics
  • quantum devices
  • nanoscale devices
  • carbon nanotubes
  • photonic crystals

Selected Publications

Papers with an asterisk(*) are based on research conducted outside of RIKEN.
  1. N. Higashide, M. Yoshida, T. Uda, A. Ishii, Y. K. Kato,
    "Cold exciton electroluminescence from air-suspended carbon nanotube split-gate devices"
    Appl. Phys. Lett. 110, 191101 (2017).
  2. *M. Yoshida, A. Popert, Y. K. Kato,
    "Gate-voltage induced trions in suspended carbon nanotubes"
    Phys. Rev. B 93, 041402(R) (2016).
  3. *M. Jiang, Y. Kumamoto, A. Ishii, M. Yoshida, T. Shimada, Y. K. Kato,
    "Gate-controlled generation of optical pulse trains using individual carbon nanotubes"
    Nature Commun. 6, 6335 (2015).
  4. *X. Liu, T. Shimada, R. Miura, S. Iwamoto, Y. Arakawa, Y. K. Kato,
    "Localized guided-mode and cavity-mode double resonance in photonic crystal nanocavities"
    Phys. Rev. Applied 3, 014006 (2015).
  5. *R. Miura, S. Imamura, R. Ohta, A. Ishii, X. Liu, T. Shimada, S. Iwamoto, Y. Arakawa, Y. K. Kato,
    "Ultralow mode-volume photonic crystal nanobeam cavities for high-efficiency coupling to individual carbon nanotube emitters"
    Nature Commun. 5, 5580 (2014).
  6. *Y. Kumamoto, M. Yoshida, A. Ishii, A. Yokoyama, T. Shimada, Y. K. Kato,
    "Spontaneous exciton dissociation in carbon nanotubes"
    Phys. Rev. Lett. 112, 117401 (2014).
  7. *A. Yokoyama, M. Yoshida, A. Ishii, Y. K. Kato,
    "Giant circular dichroism in individual carbon nanotubes induced by extrinsic chirality"
    Phys. Rev. X 4, 011005 (2014).
  8. *S. Moritsubo, T. Murai, T. Shimada, Y. Murakami, S. Chiashi, S. Maruyama, Y. K. Kato,
    "Exciton diffusion in air-suspended single-walled carbon nanotubes"
    Phys. Rev. Lett. 104, 247402 (2010).
  9. *Y. K. Kato, R. C. Myers, A. C. Gossard, D. D. Awschalom,
    "Observation of the spin Hall effect in semiconductors"
    Science 306, 1910 (2004).
  10. *Y. Kato, R. C. Myers, A. C. Gossard, D. D. Awschalom,
    "Coherent spin manipulation without magnetic fields in strained semiconductors"
    Nature 427, 50 (2004).

Lab Members

Principal Investigator

Yuichiro Kato
Team Leader

Core Members

Akihiro Ishii
Postdoctoral Researcher
Widianta Gomulya
Postdoctoral Researcher

Contact information

Main Research Building, Room 420,
2-1 Hirosawa,
Wako, Saitama
351-0198, Japan
Tel: +81-(0)48-462-1111 (ext. 3432)

Email: yuichiro.kato [at]

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