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.
Michael D. Randle, Masayuki Hosoda, Russell S. Deacon, Manabu Ohtomo, Patrick Zellekens, Kenji Watanabe, Takashi Taniguchi, Shota Okazaki, Takao Sasagawa, Kenichi Kawaguchi, Shintaro Sato, Koji Ishibashi,
"Gate-defined Josephson Weak-Links in Monolayer WTe2"
Advanced Materials, 35, 2301683 (2023) - 2.
Patrick Zellekens, Russell Deacon, Pujitha Perla, Detlev Grutzmacher, Mihail Lepsa, Thomas Schapers, and Koji Ishibashi,
"Microwave spectroscopy of Andreev states in InAs nanowire-based hybrid junctions using a flip-chip layout"
Communications Physics, 5, 267 (2022) - 3.
Akira Hida and Koji Ishibashi,
"Exciton Controlled-NOT Gate Using Coupled Quantum Dots in Carbon Nanotube"
ACS Photonics, 9, 3398 (2022) - 4.
Patrick Zellekens, Russell Deacon, Pujitha Perla, H. Aruni Fonseka, Timm Morstedt, Steven A. Hindmarsh, Benjamin Bennemann, Florian Lentz, Mihail I. Lepsa, Ana M. Sanchez, Detlev Grutzmacher, Koji Ishibashi, and Thomas Schapers,
"Hard-Gap Spectroscopy in a Self-Defined Mesoscopic InAs/Al Nanowire Josephson Junction"
Phys. Rev. Applied 14, 054019 (2020) - 5.
Keiji Ono, Takahiro Mori, Satoshi Moriyama,
"High-temperature operation of a silicon qubit"
Scientific Report, 9, 469 (2019) - 6.
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 Lett. 19, 1052 (2019) - 7.
Russell Deacon, Jonas Wiedenmann, Erwann Bocquillon, Teun M. Klapwijk, Philipp Leubner, Christoph Brune, 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) - 8.
Erwann Bocquillon, Russell Deacon, Jonas Wiedenmann, Philipp Leubner, Teun M. Klapwijk, Christoph Brune, Koji Ishibashi, H. Buhmann, Laurens W. Molenkamp,
"Gapless Andreev bound states in the quantum spin Hall insulator HgTe"
Nature Nanotechnology, 12, 137 (2017) - 9.
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) - 10.
Akira Hida and Koji Ishibashi,
"Molecule-induced quantum confinement in single-walled carbon nanotube",
Appl. Phys. Express 8, 045101 (2015)
Recent Research Results
Dec. 8, 2023
Making a quantum sandwich from just one material
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
- Michael Daniel Randle
- Postdoctoral Researcher
Contact Information
2-1 Hirosawa, Wako, Saitama 351-0198, Japan
Email: kishiba [at] riken.jp