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Nakatsuji-Sakai Lab
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The lab creates new quantum materials and discovers the phenomena that topology gives rise to.
AboutAbout the lab
Creating quantum materials to discover new physical properties
The Nakatsuji-Sakai Lab studies how to create new quantum materials and measure their properties with precision.
Magnetism, superconductivity, and spintronics have been reexamined through the concept of topology, and new phenomena are being discovered one after another.
Driving this trend is the discovery of quantum materials that turn new concepts into reality.
The lab carries out the search for and synthesis of materials, as well as precise measurements, all on its own, with the aim of elucidating the underlying physical laws.
Key terms
- Topology
- A mathematical concept that focuses on properties that do not change even when a shape is continuously deformed. It is also used to classify the states of electrons.
- Antiferromagnet
- A material in which neighboring spins align in opposite directions, so that the magnetic properties cancel out overall.
- Spintronics
- A technology that handles information by using not only the charge of electrons but also their spin.
NewsLab news
A master's student received an Excellence Award for a poster presentation at the MERIT Independent Camp
Succeeded in controlling the electrical switching mechanism through film thickness
Demonstrated an ultrafast, non-volatile switching device
Observed the largest transverse magneto-thermoelectric conductivity ever recorded at room temperature
Proposed a large TMR effect in an antiferromagnet
ResearchResearch themes
The specific themes the lab is currently pursuing include relativistic particles and new quantum phenomena in materials, quantum transport at room temperature in topological magnets, and quantum phase transitions in strongly correlated electron systems. The lab itself carries out materials exploration and synthesis based on an understanding of physical properties, as well as precise measurements.
*Illustrative imageTopological quantum properties and quantum transport
The lab was the first in the world to demonstrate experimentally that a large anomalous Hall effect appears even in spin liquids and antiferromagnets that have no magnetization. Its origin lies in the topological nature of the electronic structure.
*Illustrative imageAntiferromagnetic spintronics
The lab brings antiferromagnets into spintronics, which uses both the charge and the spin of electrons. Because antiferromagnets produce only small stray fields and can be operated at high speed, they are attracting attention as materials for next-generation memory.
*Illustrative imageStrongly correlated electron systems and unconventional superconductivity
In materials where electrons strongly repel one another, there appear strange metals that conventional pictures cannot explain, as well as superconductivity that does not follow BCS theory. The lab synthesizes disorder-free single crystals itself and searches for new phenomena through low-temperature measurements.
*Illustrative imageAntiferromagnetic tunnel magnetoresistance
In a device where an insulator is sandwiched between magnetic metals, the electrical resistance changes depending on the direction of the magnetic moments. In a device using the antiferromagnet Mn3Sn, the lab observed this effect at room temperature.
MembersFaculty
The members of the Nakatsuji-Sakai Lab consist of faculty, project researchers, JSPS Research Fellows, doctoral and master's students, technical assistants, and secretaries.As of 2026
- ProfessorSatoru NakatsujiPublications ↗
- Project ProfessorAkio Fukushima
- LecturerAkito SakaiPublications ↗
- Project Associate ProfessorHiroshi IdzuchiPublications ↗
- Project Assistant ProfessorHanshen Tsai
- Project Assistant ProfessorHiroshi KatsumotoPublications ↗
- Project Assistant ProfessorMingxuan FuPublications ↗
- Project Assistant ProfessorMihiro AsakuraPublications ↗
VoicesStudent voices
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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: “FZU AV CR Silicon Single Crystal C” Mojmir Churavy / CC BY-SA 4.0 (cropped)
- Topological quantum properties and quantum transport: “Weyl Balents” Bianguang / CC BY-SA 4.0 (cropped)
- Antiferromagnetic spintronics: “MRAM Cell 3D Model” OJB Quantum / CC BY 4.0 (cropped)
- Strongly correlated electron systems and unconventional superconductivity: “Magnetic levitation of a superconductor” Your stepbro sunset / CC BY 4.0 (cropped)
- Antiferromagnetic tunnel magnetoresistance: “TMR” Deshi at Vietnamese Wikipedia / Public domain (cropped)
- Related lab (Katsura Lab): “Icosahedrite Diffraction Pattern” Paul Steinhardt / CC BY-SA 4.0 (cropped)
- Related lab (Hayashi Lab): “Optical elements and green laser beem” Dasha Butova / CC BY-SA 4.0 (cropped)
- Related lab (Kobayashi Lab): “Irradiated spot of diamond with high concentration of nitrogen-vacancy centers” Lillian B. Hughes ほか
/ CC BY 4.0 (cropped) - Related lab (Arita Lab): “Magnetic levitation of a superconductor” Your stepbro sunset / CC BY 4.0 (cropped)
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