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Condensed Matter Theory Lab
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A lab that uses quantum many-body theory to explain phenomena that emerge from large numbers of electrons and atoms.
AboutAbout the lab
When many come together, entirely new phenomena emerge
The Condensed Matter Theory Lab studies, from the standpoint of quantum many-body theory, the diverse physical phenomena that appear when many microscopic constituents such as electrons and atoms interact.
Superconductivity, superfluidity, Bose-Einstein condensation, and magnetism are typical examples.
The lab aims to find new universal laws behind such many-body phenomena and to build theories that describe them.
It takes on this work with a wide range of methods, from analytical approaches such as field theory to numerical computer simulations.
Key terms
- Quantum many-body theory
- A theory that examines how many particles obeying quantum mechanics behave when they interact with one another
- Heavy-fermion systems
- Materials in which interactions between electrons make the effective mass of the electrons thousands of times larger than the original
- Cold atomic systems
- Assemblies of atoms cooled to extremely low temperatures with lasers, whose properties can be freely tuned
ResearchResearch themes
The lab's research aims to understand, from the viewpoint of quantum many-body theory, the diverse physical phenomena woven by a macroscopic number of constituents. It seeks to find new universal laws behind many-body phenomena and to construct theories that describe them.
*Illustrative imageQuantum condensed phases in strongly correlated electron systems
In systems where electrons in solids move with strong correlations, heavy-fermion behavior, anisotropic superconductivity, and Mott transitions appear. The lab investigates the properties of systems in which degrees of freedom such as spin, orbital, and lattice vibrations are intertwined, using the renormalization group and dynamical mean-field theory.
*Illustrative imageQuantum phase transitions in low-dimensional systems
In systems that are effectively close to one or two dimensions, the effects of quantum fluctuations are especially strong. Using conformal field theory, the Bethe ansatz, the density matrix renormalization group, and other methods, the lab elucidates the rich behavior of low-dimensional many-body systems from a microscopic viewpoint.
*Illustrative imageSuperfluid helium
The lab has theoretically predicted new superfluid phases that 3He exhibits on solid surfaces and in nanoscale porous media, and for 4He it studies critical fluctuations at phase transitions and the effects of disorder.
*Illustrative imageQuantum condensed phases in cold atomic systems
Cold atomic systems confined in optical lattices have attracted attention as quantum simulators. The lab studies new quantum condensed phases in optical lattices and quantum dynamics under external control.
MembersFaculty
The members of the Condensed Matter Theory Lab are faculty, postdoctoral researchers, and doctoral and master's students.As of 2026
- ProfessorYouichi Yanase
- ProfessorTakahiro Morimoto
- Associate ProfessorTsuneya Yoshida
- Associate ProfessorPETERS Robert
- Program-Specific LecturerSota Kitamura
- Assistant ProfessorMasaki Tezuka
- Assistant ProfessorAkito Daido
- Program-Specific Assistant ProfessorHikaru Ueki
- Program-Specific Assistant ProfessorKazuki Yamamoto
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: “Ytterbium Optical Lattice Clock” KRISS, the Korean Research Institute of Standards and Science / CC BY-SA 3.0 (cropped)
- Quantum condensed phases in strongly correlated electron systems: “Heavy Fermion CeRhIn5 Cristallographic Structure” Julien Bobroff (user:Jubobroff), LPS, Orsay, France / CC BY-SA 3.0 (cropped)
- Quantum phase transitions in low-dimensional systems: “Ising Criticality2” Damian Owls / CC BY-SA 4.0 (cropped)
- Superfluid helium: “Helium dispersion” D.G. Henshaw and A.D. B. Woods / CC BY-SA 4.0 (cropped)
- Quantum condensed phases in cold atomic systems: “AtomsInLattice” Jpagett / CC BY-SA 4.0 (cropped)
- Related lab (Condensed Matter Physics Lab): “FQHE Hall” Jakubtr / CC BY-SA 3.0 (cropped)
- Related lab (Quantum Condensed Matter Lab): “Spin Polarized Scanning Tunneling Microscope ANL” Argonne National Laboratory's Flickr page / CC BY-SA 2.0 (cropped)
- Related lab (Low Temperature Physics Lab): “SCORPIO Cryostat ( -CC)” NOIRLab/SwRI / CC BY 4.0 (cropped)
- Related lab (Statistical Dynamics Lab): “Angleofrepose” Captain Sprite at English Wikipedia / CC BY-SA 2.5 (cropped)
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