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Statistical Physics Lab
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A lab that uses theory and numerical computation to clarify the magnetism and dielectric properties generated by electrons.
AboutAbout the lab
Theory for new material properties arising from entangled electrons.
The Statistical Physics Lab studies properties of electrons in solids, such as magnetism and dielectric properties, using theory and numerical computation.
In strongly correlated electron systems, where electrons repel each other strongly, not only charge but also spin and orbital degrees of freedom become entangled, giving rise to properties not found in ordinary metals.
The lab also uses first-principles calculations and machine learning to understand real materials and to search for new materials with novel functions.
The Okuda group also studies phase transitions in spin glasses, coupled oscillators, and complex networks.
Key terms
- Strongly correlated electron system
- A class of materials in which the repulsion between electrons in a solid is so strong that electrons cannot be treated one by one independently.
- Multipole
- A quantity describing how a distribution of charge or magnetization is biased. It originally comes from electromagnetism, and can also be applied to the world of electrons.
- Multiferroics
- Materials that combine multiple properties, such as magnetism and dielectric properties. They allow control such as changing magnetism with an electric field.
- First-principles calculation
- A method of calculating the electronic states of a material from the fundamental laws of quantum mechanics, without relying on experimental values.
NewsLab news
Prof. Hayami receives the Young Scientists' Prize of the Commendation for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology
A student receives the Outstanding Student Presentation Award from the Physical Society of Japan
A paper on the pseudogap in skyrmion magnets is published in Science
A paper by a master's student is selected as an Editors' Suggestion in Physical Review B
A student receives the Outstanding Student Presentation Award from the Physical Society of Japan
ResearchResearch themes
The lab studies the diverse properties of strongly correlated electron systems by combining theoretical analysis and numerical simulation of simplified models with first-principles calculations. Through the discovery and understanding of new quantum states and physical phenomena, it aims to build the theoretical foundation for next-generation technologies.
*Illustrative imageA multipole theory of electronic states
The lab is developing a theory that describes electronic orders, in which charge, spin, and orbital degrees of freedom are intricately entangled, within the single framework of multipoles. It also serves as a guide for understanding material responses and for searching for new functional materials.
*Illustrative imageBuilding effective models from first-principles calculations
The lab is developing methods to construct, from first-principles calculation results, effective models in which couplings among electron degrees of freedom such as spin and orbital are easy to see. The methods are released as a Python library.
*Illustrative imageNew multiferroic phenomena
This research uses multipoles to understand, from the electrons' point of view, "cross-correlation" effects such as changing magnetism with an electric field and changing dielectric properties with a magnetic field. It also covers responses to various external fields, such as electric current and heat current.
*Illustrative imageSpin glasses and frustrated systems
The lab investigates how a collection of spins behaves when interactions that align neighboring spins in the same direction and interactions that align them in opposite directions are mixed (Okuda group).
MembersFaculty
The members of the Statistical Physics Lab consist of faculty members, postdoctoral researchers, and students at the doctoral, master's, and undergraduate levels.As of 2026
- ProfessorSatoru Hayami
- LecturerRikuto Oiwa
- Assistant ProfessorKoji Okuda
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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: “Geometric Frustration and Spin Correlated Disorder on a Hexagonal Lattice” Dxz2019 / CC BY-SA 4.0 (cropped)
- A multipole theory of electronic states: “Spherical harmonics lobes” Hellingspaul / CC BY-SA 3.0 (cropped)
- Building effective models from first-principles calculations: “WanF-BaTiO3” Lorenzo Paulatto (Paulatz) / CC BY-SA 3.0 (cropped)
- New multiferroic phenomena: “Multiferroic domains” Tim Hoffmann / CC BY-SA 4.0 (cropped)
- Spin glasses and frustrated systems: “Spin glass by Zureks” Zureks / CC0 (cropped)
- Related lab (Low-Dimensional Materials Physics Lab): “900 magnet new” Speeding Cars at English Wikipedia / CC BY-SA 3.0 (cropped)
- Related lab (Mathematical Physics Lab): “Penrose tiling in CC-3, IIIT Allahabad” Deepak Purti / CC BY-SA 4.0 (cropped)
- Related lab (Quantum Condensed Matter Physics Lab): “Thin section scan crossed polarizers Siilinjärvi R edit” kallerna / CC BY-SA 4.0 (cropped)
- Related lab (Solid State Electronic Properties Lab): “YBCO-xtal-3D-SF” Ben Mills / Public domain (cropped)
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