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Kohda-Suzuki-Ishihara Lab
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The lab manipulates the spin of electrons to create new information devices and quantum technologies.
AboutAbout the lab
Controlling electron spin to the ultimate limit
The Kohda-Suzuki-Ishihara Lab researches ultra-precise control of electron spin in semiconductors.
Spintronics is a field that uses spin, the magnetism arising from an electron's rotation, to pursue functions that charge alone cannot achieve.
Using the "electron spin wave," in which spin propagates while rotating through space, as a foothold, the lab explores new properties of spin in semiconductors.
Based on this principle, the lab is developing functions for ultra-fast, ultra-low-power quantum computers and next-generation information processing devices.
Key terms
- Spintronics
- A field that uses spin, the magnetism arising from an electron's rotation, to create functions that cannot be achieved with charge alone
- Electron spin wave
- A wave in which the spins of electrons propagate while rotating, staying in step with one another
- Valley
- An energy valley that electrons can occupy in a semiconductor. It can be used as a degree of freedom separate from spin
NewsLab news
A paper whose first author is a doctoral student was published in 2D Materials
Assistant Professor Ishihara was given the title of Tohoku University Distinguished Researcher
Results of joint research with NTT Basic Research Laboratories were published in Nano Letters
ResearchResearch themes
Based on ultimate electron spin control technology, the lab aims to create information devices and quantum technologies built on new concepts. It is also searching for spin and quantum functions that are not yet known.
*Illustrative imageSpatial structure of spin in semiconductors
The lab has shown that the "electron spin wave," in which spin propagates while rotating through space, exists stably in semiconductors and can be controlled from the outside. It is pioneering a new research field, "helical spintronics," that makes use of this spatial structure.
*Illustrative imageSpin properties of various semiconductors
In addition to silicon and GaAs, the lab investigates the spin properties of new semiconductor materials such as atomic-layer (two-dimensional) materials and oxides, with the aim of applying them to next-generation information devices. It also explores the use of physical quantities that have not been used before, such as the degree of freedom called the valley, and orbital currents, in addition to spin.
MembersFaculty
The members of the Kohda-Suzuki-Ishihara Lab consist of faculty members, postdoctoral researchers, administrative assistants, technical assistants, doctoral and master's students, and undergraduates.As of 2026
- ProfessorMakoto Kohda
- Associate ProfessorMasako Suzuki
- Assistant ProfessorJun Ishihara
- Project Assistant ProfessorSota Yamamoto
- Project ProfessorTakeshi Oshima
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Dilution Fridge with Quantum Processors Enclosed 008 8K” OJB Quantum / CC BY 4.0 (cropped)
- Spatial structure of spin in semiconductors: “Gallium Arsenide (GaAs) 2" wafer” La2O3 / CC BY-SA 3.0 (cropped)
- Spin properties of various semiconductors: “Graphen” AlexanderAlUS / CC BY-SA 3.0 (cropped)
- Related lab (Saito Lab): “Molybdenite-251617” Robert M. Lavinsky / CC BY-SA 3.0 (cropped)
- Related lab (Seki Lab): “Ferrofluid in magnetic field” Steve Jurvetson / CC BY 2.0 (cropped)
- Related lab (Ichitsubo Lab): “Magnesium crystals” Warut Roonguthai / CC BY-SA 3.0 (cropped)
- Related lab (Todoroki Lab): “An example of an electrolytic ozone generator” Mdemyer / CC BY-SA 4.0 (cropped)
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