Centers & Labs

RIKEN Center for Emergent Matter Science

Quantum Effect Device Research Team

Team Leader: Koji Ishibashi (D.Eng.)
Koji  Ishibashi(D.Eng.)

To explore future nanoelectronics, we develop fabrication processes of sub-10 nm structures, and study their electroical and optical properties to apply them to functional nanodevices. We use carbon nanotubes, semiconductor (Ge/Si, InAs, InSb et al.) nanowires, graphene and functional molecules as building blocks of those nanostructures. Besides, we are interested in organic optical devices combined with plasmonic structures . With a combination of the top-down and bottom-up technologies, we fabricate quantum dots, CNT/molecule heterostructures and semiconductor/superconductor hybrid nanostructures for use in single electron devices and quantum computing devices.

Main Research Field


Related Research Fields

Physics / Materials Sciences

Research Subjects

  • Fabrication processes at 10nm scale
  • Physics and application of nanoscale devices
  • Plasmonics applied to organic optical devices

Selected Publications

  1. J. Wiedenmann, E. Bocquillon, R.S. Deacon, S. Hartinger, O. Herrmann, T.M. Klapwijk, L. Maier, C. Ames, C. Bru¨ne, C. Gould, A. Oiwa, K. Ishibashi, S. Tarucha, H. Buhmann & L.W. Molenkamp.:
    "4π-periodic Josephson supercurrent in HgTe-based topological Josephson junctions"
    Nature Commun. 7, 10303 (2016)
  2. Akira Hida and Koji Ishibashi.:
    "Molecule-induced quantum confinement in single-walled carbon nanotube"
    Appl. Phys. Express 8, 045101 (2015)
  3. Xin Zhou, James Hedberg, Yoichi Miyahara, Peter Grutter, and Koji Ishibashi.:
    "Scanning gate imaging of two coupled quantum dots in single-walled carbon nanotubes"
    Nanotechnology 25, 495703 (2014)
  4. Suprem R. Das, Cem Akatay, Asaduzzaman Mohammad, Mohammad Ryyan Khan, Kosuke Maeda, Russell S. Deacon, Koji Ishibashi, Yong P. Chen, Timothy D. Sands, Muhammad A. Alam1 and David B. Janes.: "Electrodeposition of InSb branched nanowires: Controlled growth with structurally tailored properties"
    J. Appl. Phys. 116, 083506 (2014)
  5. Xin Zhou and Koji Ishibashi.:
    "Single charge detection in capacitively coupled integrated single electron transistors based on single-walled carbon nanotubes"
    Appl. Phys. Lett. 101, 123506 (2012)
  6. Sung-Kwon Shin, Shaoyun Huang, Naoki Fukata, and Koji Ishibashi.:
    "Top-gated Germanium nanowire quantum dots in a few electron regime"
    Appl. Phys. Lett. 100, 073103 (2012)
  7. T. Nishio, T. Kozakai, S. Amaha, M. Larsson, H. Nilsson, H. Q. Xu, G. Q. Zhang, K. Tateno, H. Takayanagi and K. Ishibashi.:
    "Supercurrent through InAs nanowires with highly transparent superconducting contacts"
    Nanotechnology, 22, 445701 (2011)
  8. T. Nishino, R. Negishi, M. Kawao, T. Nagata, H. Ozawa, and K. Ishibashi.:
    "The fabrication and single electron transport of Au nanoparticles placed between Nb nanogap electrodes"
    Nanotechnology, 21, 225301 (2010)

Lab Members

Principal Investigator

Koji Ishibashi
Team Leader

Core Members

Takayuki Okamoto
Senior Research Scientist
Takafumi Sassa
Senior Research Scientist
Keiji Ono
Senior Research Scientist
Jobu Matsuno
Senior Research Scientist
Russell Stewart Deacon
Research Scientist

Contact information

W407, Cooperation Center, 2-1 Hirosawa, Wako, Saitama
351-0198 Japan

Email: kishiba [at]

Related links

Recent research results

July 1, 2015: Press Release
Producing spin-entangled electrons