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Condensed Matter Physics Lab
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A theory lab exploring the quantum properties of matter that emerge from correlations among many particles.
AboutAbout the lab
Gather many particles, and they show a completely different face.
The Condensed Matter Physics Lab (Yukawa Institute for Theoretical Physics) studies the nontrivial properties that arise when many particles, such as electrons in solids and ultracold atoms, interact with one another through correlations.
At low temperatures, where quantum mechanical effects become strong, particle statistics and wave function phases become intertwined, giving rise to intriguing physical properties.
By combining quantum field theory, large-scale numerical computation, and quantum-information-based methods, the lab aims to understand the rich properties of quantum many-body systems.
Key terms
- Spin liquid
- A state in which spins do not align even at low temperatures and remain quantum-fluctuating
- Entanglement
- A situation in which the quantum states of separated particles are linked in an inseparable way
- Optical lattice
- A periodic array of dips, like an egg carton, created by overlapping laser beams, which can trap atoms
ResearchResearch themes
The lab studies the properties of matter at low temperatures, where the quantum nature of particles is pronounced. Using field theory and numerical computation, it investigates topics such as order formation driven by orbital degrees of freedom and crystal structure in electron systems, quantum phenomena of low-dimensional magnets under strong magnetic fields, and quantum phases and nonequilibrium dynamics of ultracold gases.
*Illustrative imageExotic phases of quantum magnetism
In Mott insulators, diverse interactions among the spins of localized electrons give rise to various kinds of magnetism. The lab is interested in spin liquids and in systems where orbital and magnetic degrees of freedom are intertwined.
*Illustrative imageTopological phases and entanglement
The lab studies topological phases that cannot be captured within the framework of Landau theory, such as the fractional quantum Hall effect and spin liquids.
*Illustrative imageNew quantum phases of ultracold gases in optical lattices
Ultracold gases in optical lattices allow precise control of density, interaction strength, lattice geometry, and more. The lab searches for new quantum phases and quantum phase transitions using a range of analytical methods, and also proposes solid-state systems in which they could be realized.
*Illustrative imageNonequilibrium dynamics of one-dimensional quantum systems
Quantum many-body systems confined to a narrow one-dimensional geometry show counterintuitive properties caused by strong quantum fluctuations. The lab investigates transport, quantum phase transitions, and nonequilibrium dynamics using the time-dependent density matrix renormalization group, exact diagonalization, bosonization, and other methods.
MembersFaculty
The members of the Condensed Matter Physics Lab consist of faculty, postdoctoral researchers, and doctoral and master's students.As of 2026
- ProfessorMasatoshi Sato
- Associate ProfessorKeisuke Totsuka
- Assistant ProfessorKen Shiozaki
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: “FQHE Hall” Jakubtr / CC BY-SA 3.0 (cropped)
- Exotic phases of quantum magnetism: “Ising-tartan” Linas at English Wikipedia / CC BY-SA 3.0 (cropped)
- Topological phases and entanglement: “Quantum Hall effect” Original uploader was Antikon at ru.wikipedia / CC BY-SA 3.0 (cropped)
- New quantum phases of ultracold gases in optical lattices: “Optical lattice ( )” National Institute of Standards and Technology / Public domain (cropped)
- Nonequilibrium dynamics of one-dimensional quantum systems: “Spin chain2” Tluck074 / CC BY-SA 4.0 (cropped)
- Related lab (Condensed Matter Theory Lab): “Ytterbium Optical Lattice Clock” KRISS, the Korean Research Institute of Standards and Science / CC BY-SA 3.0 (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)
- Related lab (Applied Mathematics (Topological Data Analysis) Lab (Yasuaki Hiraoka)): “Persistence Diagram” Rrrlw / CC BY-SA 4.0 (cropped)
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