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Tsuji Lab
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The lab uses theory to work out what happens to a collection of quantum particles when it is shaken.
AboutAbout the lab
Unraveling nonequilibrium quantum many-body systems through theory
The Tsuji Lab theoretically studies nonequilibrium phenomena and nonequilibrium properties of quantum many-body systems.
The systems it studies are collections of interacting electrons in solids and collections of atoms cooled by lasers.
It might seem that driving such a system out of equilibrium with an external force would disrupt its order and destroy its interesting properties.
However, examples have been found in which order and properties that cannot be realized in equilibrium appear, and the lab aims to understand them.
Key terms
- Quantum many-body system
- A system of many particles that influence one another and move according to quantum mechanics
- Nonequilibrium
- A condition in which a system, receiving force or energy from the outside, has departed from a settled, balanced state
- Superconductivity
- A phenomenon in which electrical resistance drops to zero when a material is cooled below a certain temperature. It occurs because electrons form pairs
NewsLab news
Clarified the role of quantum geometry in third-harmonic generation in superconductors
Analyzed Kondo physics in the Anderson impurity model with two-body loss
Analyzed amplitude modes appearing in two-dimensional coherent spectroscopy of antiferromagnets
Clarified the electron dynamics induced by light in a quantum "cat state"
Predicted carriers and excitons in a photoexcited one-dimensional Mott insulator
ResearchResearch themes
The lab conducts theoretical research with interests in nonequilibrium phenomena and nonequilibrium properties of quantum many-body systems, as well as statistical mechanics. When collections of electrons in solids or of cooled atoms are driven from the outside, order and properties that cannot be realized in equilibrium can emerge. The lab's goal is to understand these phenomena and expand their scope.
*Illustrative imageHall effect in flat bands
In materials with an energy-flat band, the Hall effect was long thought to vanish. Through analysis of lattice models, the lab showed that a Hall response remains even in such cases and that its origin lies in quantum geometry.
*Illustrative imageElectron systems coupled to optical cavities
Confining light and matter in a tiny cavity strengthens the interaction between them while preserving the quantum nature of light. The lab analyzed a model in which light is coupled to a strongly correlated electron system, using tensor network methods.
*Illustrative imageSolving many-body problems with the tensor train method
Quantum Monte Carlo methods, used for numerical calculations of quantum many-body systems, face a difficulty known as the negative sign problem. The lab applied a type of tensor train method to dynamical mean-field theory and showed that such cases can be solved with high accuracy.
*Illustrative imageUnconventional quantum many-body scar states
Quantum many-body systems have exceptional eigenstates that do not thermalize. Using many-body interactions, the lab constructed states with p-wave and d-wave superconducting pairing as exact eigenstates.
MembersFaculty
The members of the Tsuji Lab consist of faculty, project researchers, doctoral and master's students, and assistants.As of 2026
- Associate ProfessorTsuji NaotoPublications ↗
- Project Assistant ProfessorShohei ImaiPublications ↗
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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: “Cloud of ultracold atoms levitated in a magneto-optical trap” Balping / CC BY-SA 4.0 (cropped)
- Hall effect in flat bands: “Kagome-lattice-bw” WilliamSix / CC BY-SA 2.5 (cropped)
- Electron systems coupled to optical cavities: “Fabry-perot-interferometer” Geek3 / CC BY-SA 4.0 (cropped)
- Solving many-body problems with the tensor train method: “Tensor network contraction example” AtellK / CC BY-SA 4.0 (cropped)
- Unconventional quantum many-body scar states: “Magnetic levitation of a superconductor” Your stepbro sunset / CC BY 4.0 (cropped)
- Related lab (Ashida Lab): “Superconducting Metamaterial Chip 002” OJB Quantum / CC BY 4.0 (cropped)
- Related lab (Ito Lab): “Belousov Zhabotinsky reaction ( )” Stephen Morris / CC BY 2.0 (cropped)
- Related lab (Katsura Lab): “Icosahedrite Diffraction Pattern” Paul Steinhardt / CC BY-SA 4.0 (cropped)
- Related lab (Todo Lab): “Ising Criticality2” Damian Owls / CC BY-SA 4.0 (cropped)
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