Chief Scientist Laboratories Advanced Device Laboratory
Chief Scientist: Koji Ishibashi (D.Eng.)
Research Summary
We study physics in nanoscale structures that are fabricated with carbon nanotubes and semiconductor nanowires as well as nanoscale Si transistors. By controlling the quantum state of electrons, spins, and excitons one by one, we try to realize quantum information devices. On top of that, we study interesting physics in topological insulator/superconductor hybrid structures and hope to apply for the topological quantum bits.
Main Research Fields
- Engineering
Related Research Fields
- Interdisciplinary Science & Engineering
- Mathematical & Physical Sciences
- Nano/Microscience
- Applied physics
Keywords
- Quantum nanoscale devices
- Topological insulator/superconductor hybrid structures
- Carbon nanotubes
- Semiconductor nanowires
- Nanoscale Si transistors
Selected Publications
- 1.
Rui Wang, Russell S. Deacon, Jian Sun, Jun Yao, Charles M. Lieber, Koji Ishibashi.:
"Gate Tunable Hole Charge Qubit Formed in a Ge/Si Nanowire Double Quantum Dot Coupled to Microwave Photons"
Nano Letters 19, 1052 (2019) - 2.
Keiji Ono, Takahiro Mori, Satoshi Moriyama.:
"High-temperature operation of a silicon qubit"
Scientific Report, 9, 469 (2019) - 3.
Jian Sun, Russell Deacon, Rui Wang, Jun Yao, Charles M. Lieber, Koji Ishibashi.:
"Helical Hole State in Multiple Conduction Modes in Ge/Si Core/Shell Nanowire"
Nano Letters 18, 6144 (2018) - 4.
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"
Physical Review B 96, 035424 (2017) - 5.
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"
Physical Review X 7, 021011 (2017) - 6.
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) - 7.
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) - 8.
Akira Hida and Koji Ishibashi.:
"Molecule-induced quantum confinement in single-walled carbon nanotube"
Appl. Phys. Express 8, 045101 (2015) - 9.
Y. Kawano, T. Fuse, S. Toyokawa, T. Uchida, K. Ishibashi.:
"Terahertz photon-assisted tunneling in carbon nanotube quantum dots"
Journal of Applied Physics 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"
Physical Review Letters 94, 186806 (2005)
Recent Research Results
Sep. 11, 2015
Materials enter a new phase
Annual research report
Related Links
Lab Members
Principal investigator
- Koji Ishibashi
- Chief Scientist
Core members
- Tomohiro Yamaguchi
- Senior Research Scientist
- Masashi Nantoh
- Senior Research Scientist
- Keiji Ono
- Senior Research Scientist
- Russell Stewart Deacon
- Senior Research Scientist
- Akira Hida
- Research Scientist
- Yoshisuke Ban
- Postdoctoral Researcher
- Hui Wang
- Contract Researcher
- Takayuki Okamoto
- Special Temporary Research Scientist
- Masayuki Hosoda
- Visiting Scientist
Contact Information
2-1 Hirosawa, Wako, Saitama 351-0198, Japan
Email: kishiba [at] riken.jp