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Hotta Lab
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The lab does theoretical research in condensed matter physics, searching for new phases that emerge when electrons and spins come together.
AboutAbout the lab
Toward the essence of properties born from quantum fluctuations and many-body effects
The Hotta Lab conducts theoretical research on pioneering new phases in quantum many-body and strongly correlated systems, in which large numbers of electrons and spins interact.
Condensed matter physics is the field that seeks to understand how a rich variety of phenomena arises when an enormous number of electrons, which are microscopic particles, come together.
The lab investigates what properties arise from the combination of quantum fluctuations and many-body effects, and how their essence can be understood.
Its ultimate goal is to find new concepts from a theoretical standpoint, stimulate experiments, and create new fields.
Key terms
- Strongly correlated system
- A material in which the repulsion between electrons is strong, so electrons can no longer be treated independently one by one. A wide variety of properties emerge.
- Frustration
- A situation in which not all interactions can be satisfied at the same time. The direction of each spin cannot be settled into a single choice.
- Magnon
- A particle that propagates through a magnet as a spin wave. It carries only spin, not charge.
NewsLab news
An undergraduate student received the Department of Integrated Natural Sciences Award for their graduation research
A student received the Ichiko Memorial Award
A student's paper on CMPS was published
A student's paper was selected as a PRL Editor's Choice
A co-authored paper was published in Nature Communications
ResearchResearch themes
The lab's main research theme is pioneering new phases in quantum many-body and strongly correlated systems, in which large numbers of electrons and spins interact. It is interested in a wide range of phenomena in materials and models that are linked by keywords such as quantum entanglement, quantum coherence, and quantum dynamics.
*Illustrative imageFrustrated Magnets
Frustration is a situation in which a problem arises when the system as a whole tries to form a spin configuration that minimizes every individual interaction. On triangular and kagome lattices the ground state is highly degenerate, and quantum and thermal fluctuations play the leading role in forming new phases.
*Illustrative imageMagnons and the Thermal Hall Effect
Magnons in antiferromagnetic insulators experience a pseudo spin-orbit coupling caused by the Dzyaloshinskii-Moriya (DM) interaction. The lab has shown that this gives rise to the Rashba-Dresselhaus effect and the anomalous thermal Hall effect, and has also developed a general theory for searching for these effects in any antiferromagnetic insulator.
*Illustrative imageSpin Nematics
A spin nematic is a state in which spins of finite magnitude have no definite direction and are instead described as quadrupoles. The lab is studying how this state, which arises when neighboring S=1 spins become quantum-mechanically entangled, can be realized in real materials.
*Illustrative imageQuantum Liquids in One-Dimensional Magnets
In one-dimensional systems, a quantum many-body state called a Tomonaga-Luttinger liquid appears at low temperatures, and its thermodynamic properties are determined by just two quantities: the sound velocity and the Luttinger parameter. The lab found that the temperature at which the system changes from a high-temperature paramagnet to this state can be determined from the magnetic susceptibility.
MembersFaculty
The members of the Hotta Lab are faculty, researchers, and doctoral and master's students.As of 2026
- ProfessorHotta ChisaPublications ↗
- Assistant Professor川野 雅敬
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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: “Магнитная доменная структура в пленке феррита-граната” Temiryazev / CC BY-SA 4.0 (cropped)
- Frustrated Magnets: “Herbertsmithite-163165” Robert M. Lavinsky / CC BY-SA 3.0 (cropped)
- Magnons and the Thermal Hall Effect: “Ferromagnetic domains in spiral pattern for Fe60Al40” Magnunor / CC BY-SA 4.0 (cropped)
- Spin Nematics: “Nematic liquid crystal” Ingo Dierking / CC BY-SA 4.0 (cropped)
- Quantum Liquids in One-Dimensional Magnets: “Azurite - New Nevada Lode, La Sal, Utah, USA” Ivar Leidus / CC BY-SA 4.0 (cropped)
- Related lab (Kato Lab): “Liquid helium Rollin film” I, AlfredLeitner, took this photograph as part of my movie "Liquid Helium,Superfluid" / Public domain (cropped)
- Related lab (Shiomi Lab): “Magnetite-118736” Robert M. Lavinsky / CC BY-SA 3.0 (cropped)
- Related lab (Kurihara Lab): “Femtosecond Laser and Pulse Compressor - Optics Lab - INRIM” Giorgio Brida from Torino, Italy / CC BY 2.0 (cropped)
- Related lab (Sugawa Lab): “Cold atoms experiment 04” Tomasz Kawalec / CC BY-SA 4.0 (cropped)
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