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Chief Scientist Laboratories Advanced Device Laboratory

Chief Scientist: Koji Ishibashi (D.Eng.)

Research Summary

Koji  Ishibashi(D.Eng.)

We are exploring functional nanoelectronics that is complementary to the Silicon electronics. The single electron devices, quantum computing devices, spintronics devices Teraherz(THz) devices and plasmonic devices are the subjects of our interests, where an electron spin, a nuclear spin and an exciton et al. may be controlled in a single particle level. To realize these devices in nanoscale dimensions, we not only use conventional semiconductor materials, but also use carbon nanotubes and semiconductor nanowires that have extremely small dimensions which is difficult to fabricate with conventional lithography technique. We also study atom manipulation techniques for the ultimate small structures. New physics or new functionalities that appear in the nanoscale devices and new functional materials are also our interests.

Main Research Fields

  • Engineering

Related Research Fields

  • Complex Systems
  • Mathematical & Physical Sciences
  • Nano/Microsystems
  • Nanomaterials engineering
  • Nanostructural physics


  • Nanoscale devices
  • Hybrid nanostructures
  • Nanofabrication

Selected Publications

  • 1.Russell Deacon, Jonas Wiedenmann, Erwann Bocquillon, Teun M. Klapwijk, Philipp Leubner, Christoph Brüne, Seigo Tarucha, Koji Ishibashi, Hartmut Buhmann, Laurens W. Molenkamp.:
    "Josephson radiation from gapless Andreev bound states in HgTe-based topological junctions"
    Phys. Rev. X 7, 021011 (2017)
  • 2.Masashi Nantoh, Kengo Takashima, Takahiro Yamamoto and Koji Ishibashi.:
    "Sublattice site dependence of local electronic states in superstructures of CO built on a Cu(111) surface"
    Phys. Rev. B 96, 035424 (2017)
  • 3.Erwann Bocquillon, Russell Deacon, Jonas Wiedenmann, Philipp Leubner, Teun M. Klapwijk, Christoph Brüne, Koji Ishibashi, H. Buhmann, Laurens W. Molenkamp.:
    "Gapless Andreev bound states in the quantum spin Hall insulator HgTe"
    Nature Nanotechnology, 12, 137 (2017)
  • 4.Hiroshi Tomizawa, Katsuya Suzuki, Tomohiro Yamaguchi, Seiji Akita and Koji Ishibashi.:
    "Control of tunnel barriers in multi-wall carbon nanotubes using focused ion beam irradiation"
    Nanotechnology, 28, 165302 (2017)
  • 5.Takayuki Okamoto, Kei Shinotsuka, Etsuko Kawamukai and Koji Ishibashi.:
    "Self-assembly method for controlling spatial frequency response of plasmonic back reflectors in organic thin-film solar cells"
    Appl. Phys. Express 10, 012301 (2017)
  • 6.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)
  • 7.Akira Hida and Koji Ishibashi.:
    "Molecule-induced quantum confinement in single-walled carbon nanotube"
    Appl. Phys. Express 8, 045101 (2015)
  • 8.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)
  • 9.Y. Kawano, T. Fuse, S. Toyokawa, T. Uchida, K. Ishibashi.:
    "Terahertz photon-assisted tunneling in carbon nanotube quantum dots"
    J. Appl. Phys. 103, 034307 (2008)
  • 10.S. Moriyama, T. Fuse, M. Suzuki, Y. Aoyagi, K. Ishibashi.:
    "Four-electron shell structures and an interacting two-electron system in carbon nanotube quantum dots"
    Phys. Rev. Lett. 94, 186806 (2005)

Recent Research Results

Annual research report

Related Links

Lab Members

Principal investigator

Koji Ishibashi
Chief Scientist

Core members

Takayuki Okamoto
Senior Research Scientist
Tomohiro Yamaguchi
Senior Research Scientist
Masashi Nantoh
Senior Research Scientist
Keiji Ono
Senior Research Scientist
Jobu Matsuno
Senior Research Scientist
Russell Stewart Deacon
Senior Research Scientist
Akira Hida
Research Scientist
Jian Sun
Special Postdoctoral Researcher

Contact Information

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