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Kato Lab
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A condensed matter theory lab that uses theory to uncover the remarkable properties of electricity and spin flowing through solids.
AboutAbout the lab
Decoding the flow of electricity and spin through theory.
The Kato Lab theoretically studies the properties of various kinds of quantum transport that occur in solids.
Recently, the lab has focused mainly on mesoscopic systems and spintronics.
Targeting phenomena involving electron-electron interactions and quantum mechanical interference, the lab calculates electrical conductance and noise and develops theories of nonequilibrium states.
The lab also develops numerical methods, including quantum Monte Carlo calculations.
Key terms
- Mesoscopic systems
- Systems that are larger than an atom but small enough, on the order of nanometers, for quantum mechanical effects to appear clearly
- Spintronics
- Technologies and a research field that handle information using not only the electron's charge but also its spin (its property as a tiny magnet)
- Anyon
- A particle that appears only in two-dimensional systems. Its behavior when two of them are exchanged differs from that of ordinary particles (bosons and fermions)
NewsLab news
Paper published in Physical Review B
Paper published in Physical Review Letters
A doctoral student received the Student Presentation Award of the Physical Society of Japan
Press release on the theory of nonequilibrium spin noise driven by optical pulses
ResearchResearch themes
The lab theoretically studies various quantum transport properties in solids. Recently, its research has focused mainly on mesoscopic systems and spintronics.
*Illustrative imageRashba-Edelstein Magnetoresistance
The lab has developed a unified theory of Rashba-Edelstein magnetoresistance, a new electrical conduction phenomenon that makes use of spin-orbit interaction. By analyzing the contributions of scattering and spin accumulation, it clarifies how the magnetoresistance arises and how it differs between materials.
*Illustrative imageChiral Phonons and the Spin Seebeck Effect
The lab has theoretically proposed a new mechanism for the spin Seebeck effect, in which a temperature difference generates a spin current. In this mechanism, acoustic chiral phonons carry spin angular momentum.
*Illustrative imageAnyon Braiding on a Single Edge
The lab has theoretically shown that the exchange operation of anyons (braiding) can be observed on a single edge of a fractional quantum Hall system. By analyzing current noise and correlations, it clarifies how the statistical phase characteristic of anyons appears.
*Illustrative imageSpin Fluctuations Generated by Optical Pulses
The lab has theoretically proposed a new method for measuring magnetization noise using the optical pump-probe technique. It calculates the spin noise of a ferromagnet driven by optical pulses and shows that the magnitude of this noise contains information on the quantization of magnetization.
MembersFaculty
The members of the Kato Lab include faculty, project researchers, doctoral and master's students, ISSP Research Fellows, technical assistants, and a secretary.As of 2026
- Associate ProfessorTakeo KatoPublications ↗
- Assistant ProfessorRyotaro Sano
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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: “MRAM Cell 3D Model” OJB Quantum / CC BY 4.0 (cropped)
- Rashba-Edelstein Magnetoresistance: “Magnetoresistance” Alexander Mayorov / CC BY-SA 3.0 (cropped)
- Chiral Phonons and the Spin Seebeck Effect: “Tellurium crystal” Dschwen / CC BY 2.5 (cropped)
- Anyon Braiding on a Single Edge: “Braid s2r” RobertLipshitz / CC0 (cropped)
- Spin Fluctuations Generated by Optical Pulses: “Ti Sapph YAG supercontinnum” Neath g / CC BY-SA 4.0 (cropped)
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