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Tohyama Lab
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A lab that theoretically explores quantum phenomena in materials with strong electron-electron interactions.
AboutAbout the lab
Solving diverse phenomena from microscopic quantum laws through theory
The Tohyama Lab conducts theoretical research to uncover new quantum phenomena in condensed matter.
The microscopic world of atoms and molecules is governed by quantum mechanics.
When many molecules and atoms come together, quantum phenomena appear that are so diverse and rich that they could not be imagined from the properties of individual particles.
Centered on "strongly correlated electron systems," in which the Coulomb interaction between electrons is strong, the lab carries out theoretical research on the mechanism of high-temperature superconductivity, quantum magnetism, topological quantum materials, and nonequilibrium quantum phenomena.
The lab combines analytical methods with computational physics methods that make full use of supercomputers.
Key terms
- Strongly correlated electron systems
- Systems in which the Coulomb interaction between electrons is strong. They form the core of this lab's theoretical research.
- High-temperature superconductivity
- Superconductivity that appears in cuprates and iron pnictides. The lab aims to clarify its origin through theory.
- Nonequilibrium quantum phenomena
- Quantum phenomena that occur when an external field such as light is applied, such as photoinduced state changes and relaxation phenomena.
NewsLab news
Prof. Tohyama's co-authored paper published in Nature Communications
Prof. Tohyama receives the American Physical Society's Outstanding Referee recognition
Prof. Tohyama's co-authored paper selected as an Editors’ Choice in JPSJ
A doctoral student receives the FY2024 Tokyo University of Science Student Award and the Omura Award
A paper by doctoral students selected as a highlighted paper in JPSJ
ResearchResearch themes
This lab conducts theoretical research to uncover new quantum phenomena in condensed matter. Centered on "strongly correlated electron systems," in which the Coulomb interaction between electrons is strong, it combines analytical methods with numerical methods that use supercomputers.
*Illustrative imageMechanisms of high-temperature superconductivity
The lab theoretically clarifies the origin of the high-temperature superconductivity that appears in cuprates and iron pnictides. It uses mean-field approximations and numerical methods for strongly correlated models.
*Illustrative imageQuantum magnetism in transition metal compounds and organic materials
The lab elucidates magnetic frustration effects arising from geometric arrangement, which are seen in some transition metal compounds, organic materials, and biological materials. It uses analytical methods and numerical methods based on supercomputers.
*Illustrative imageNonequilibrium quantum phenomena in strongly correlated electron systems
The lab aims to elucidate nonequilibrium quantum phenomena that occur when an external field such as light is applied to strongly correlated electron systems, including photoinduced state changes, relaxation phenomena, and Floquet engineering. It uses analytical and numerical methods.
*Illustrative imageSpectroscopy theory for strongly correlated electron systems
The lab studies the theory needed to apply methods such as inelastic neutron scattering, inelastic X-ray scattering, and angle-resolved photoemission spectroscopy to strongly correlated electron systems. It collaborates with experiments carried out at large facilities such as SPring-8 and J-PARC.
MembersFaculty
The Tohyama Lab's members consist of faculty, secretaries, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorTakami Tohyama
- Special LecturerRyo Okugawa
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: “High-Temperature Superconducting Cables ( )” National Institute of Standards and Technology / Public domain (cropped)
- Mechanisms of high-temperature superconductivity: “Magnet 4” Peter Nussbaumer / CC BY-SA 3.0 (cropped)
- Quantum magnetism in transition metal compounds and organic materials: “Bismuth Crystal 13x )” Savannah River Site / Public domain (cropped)
- Nonequilibrium quantum phenomena in strongly correlated electron systems: “Oak Ridge - Kraken (Cray XT5)” Daderot / Public domain (cropped)
- Spectroscopy theory for strongly correlated electron systems: “Neutron Detector ( )” National Institute of Standards and Technology / Public domain (cropped)
- Related lab (伊藤研究室): “BURNED OUT SUPERCONDUCTING MAGNET COIL - NARA - 17450109” Martin Brown / Public domain (cropped)
- Related lab (宮川研究室): “Liquid helium dewar” Alkamid / CC BY-SA 3.0 (cropped)
- Related lab (後藤研究室): “3.5 inch hard disk drive, side view” Gunnar Wolf / CC BY-SA 4.0 (cropped)
- Related lab (齋藤研究室): “Stacja badawcza PEEM” Achrzes / CC BY-SA 4.0 (cropped)
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