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Motome Lab
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A theory lab that explores new quantum phenomena arising from interactions among electrons.
AboutAbout the lab
Unraveling new quantum phenomena through the theory of strongly correlated systems
The Motome Lab theoretically studies phase transitions and novel quantum properties caused by interactions among electrons moving inside materials.
In "strongly correlated electron systems," where electrons repel each other strongly, a rich variety of properties appear that differ greatly from those of ordinary metals and semiconductors.
Based on quantum mechanics and statistical mechanics, the lab combines first-principles calculations, model construction, and numerical simulation.
Recently, the lab has also focused on developing methods that use machine learning and on condensed matter research.
Key terms
- Strongly correlated electron systems
- Materials in which electrons repel each other so strongly that they can no longer move freely
- Quantum spin liquid
- A state in which the spins that give rise to magnetism do not freeze into an ordered arrangement even at low temperatures, and instead behave like a liquid
- Skyrmion
- A tiny, particle-like structure in a magnet in which spins are arranged in a vortex-like twist
NewsLab news
Review paper on the quantum spin liquid in atomic-layer α-RuCl3 published
Paper by doctoral students and others selected as an Editors' Suggestion
Magnetic hopfion paper published in APS Open Science and other journals
Master's student receives the Outstanding Master's Thesis Award in Applied Physics
Quantum reservoir computing paper published in Physical Review Letters
ResearchResearch themes
The lab studies the diverse properties exhibited by quantum materials and the mechanisms behind them, using theoretical methods based on quantum mechanics and statistical mechanics. Through research closely tied to real materials, it aims to extend these insights to materials design and the prediction of material properties, and to create a new materials science.
*Illustrative imageQuantum spin liquids
In quantum spin liquids, where the arrangement of spins behaves like a liquid, the lab investigates "fractionalization," in which spin excitations split into entities such as Majorana fermions, using the Kitaev model as a basis. The lab also keeps applications to quantum computing in view.
*Illustrative imageTopological magnets
The lab studies magnets with twisted spin textures, such as skyrmions and hedgehogs. It theoretically investigates phenomena caused by the emergent electromagnetic fields these structures generate, as well as the mechanisms by which electric current moves them.
*Illustrative imageUnusual responses arising from spin and orbital degrees of freedom
The lab theoretically investigates phenomena known as nonreciprocal responses and off-diagonal responses, which are caused by the interplay between the spin and orbital degrees of freedom of electrons.
*Illustrative imageMachine learning for condensed matter research
The lab applies machine learning to condensed matter research and develops new computational methods. It is also advancing research on "quantum reservoir computing," which uses the complex time evolution of quantum many-body systems for computation.
MembersFaculty
The members of the Motome Lab consist of faculty, postdocs, administrative staff, doctoral and master's students, and international interns.As of 2026
- ProfessorYukitoshi MotomePublications ↗
- Assistant ProfessorKotaro ShimizuPublications ↗
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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: “Neel skyrmion coneplot” Forschungszentrum Jülich / CC BY 4.0 (cropped)
- Quantum spin liquids: “Crystal structure ( )” Oak Ridge National Laboratory / CC BY 2.0 (cropped)
- Topological magnets: “Block skyrmion” Nitish Mathur, Matthew J. Stolt, and Song Jina / CC BY 4.0 (cropped)
- Unusual responses arising from spin and orbital degrees of freedom: “Dzyloshinskii Moriya antisymmetric exchange” Macfenchel / CC BY-SA 3.0 (cropped)
- Machine learning for condensed matter research: “Convolutional Network” Will Whitney / CC BY-SA 4.0 (cropped)
- Related lab (Shibauchi-Ishida Lab): “Quantum locking” Maxim Bilovitskiy / CC BY-SA 4.0 (cropped)
- Related lab (Kimura Lab): “Ilmenite-155036” Robert M. Lavinsky / CC BY-SA 3.0 (cropped)
- Related lab (Tokura Lab): “Perovskite” Cadmium at English Wikipedia / Public domain (cropped)
- Related lab (Arima-Tokunaga Lab): “SPring- img pano” en:User:Artorius / CC BY-SA 3.0 (cropped)
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