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Condensed Matter Theory (Sc) Lab
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The lab works on condensed matter theory, theoretically explaining phenomena produced by electrons in metals.
AboutAbout the lab
Theoretically unraveling emergent phenomena of electrons in metals
The Condensed Matter Theory Lab studies phenomena exhibited by electrons in metals, such as superconductivity, using theory based on quantum mechanics and statistical mechanics.
Matter is made of countless electrons and atoms, and their quantum mechanical properties and infinite degrees of freedom give rise to unexpected physical phenomena (emergent phenomena).
The lab focuses on topics such as superconductivity, quantum liquid crystals, kagome-lattice metals, Dirac electrons, field theory, and transport phenomena.
Lab visits are welcome at any time.
Key terms
- Superconductivity
- A phenomenon in which electrical resistance becomes zero. It occurs when electrons form Cooper pairs
- Cooper pair
- A pair of two electrons bound together in a superconductor
- Quantum liquid crystal
- A liquid-crystal-like arrangement (order) of electrons that has both particle and wave nature
- Kagome-lattice metal
- A metal whose atoms are arranged in a kagome lattice. The directions of its electron spins are difficult to settle
NewsLab news
Chiral superconductivity in kagome-lattice superconductors theoretically elucidated (press release)
A collaborative study with experimentalists shows a two-step transition of charge and spin in a Cr-based kagome superconductor
Strong electron correlations in a Cr-based kagome superconductor elucidated in collaboration with experimental researchers
Superconductivity in cuprates analyzed with a new many-body computational method, published in Physical Review B
Tiny magnetic field produced by loop currents in a kagome metal detected in collaboration with experimental researchers
ResearchResearch themes
Electrons in metals produce a variety of phenomena through strong quantum effects and interactions between electrons. The lab seeks to elucidate such emergent phenomena of metallic electrons based on quantum mechanics and statistical mechanics.
*Illustrative imageUnconventional Superconductivity
The lab studies unconventional superconductivity, in which electron correlations arising from the repulsion between electrons form Cooper pairs. In iron-based high-temperature superconductors, it showed that high-temperature superconductivity occurs when quantum fluctuations of orbitals develop.
*Illustrative imageQuantum Liquid Crystals
The lab studies liquid-crystal-like electronic order that has both particle and wave nature. It proposed a theory that explains orbital order, current order, and other orders as interference fringes produced by quantum interference between spin fluctuations.
*Illustrative imageKagome-Lattice Metals and Twisted Multilayer Graphene
The lab studies the mechanisms by which star-of-David order, loop-current order, and diverse forms of superconductivity appear in kagome-lattice metals. It also covers nematic order in twisted multilayer graphene, made by stacking graphene layers with a slight rotation between them.
*Illustrative imageDirac Electrons in Solids
The lab studies Dirac electrons, which behave in solids like particles with almost zero mass, focusing on the effects of electron correlations. In the Dirac electron system of an organic conductor, it was the first to theoretically find anomalous spin fluctuations.
MembersFaculty
The members of the Condensed Matter Theory Lab consist of faculty members, postdoctoral researchers, doctoral and master's students, and emeritus professors.As of 2026
- ProfessorHiroshi Kontani
- G30 ProfessorWOJDYLO John
- Associate ProfessorAkito Kobayashi
- Associate ProfessorSeiichiro Onari
- LecturerYoichi Yamakawa
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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: “Suspension of a superconductor by a magnet” Julien Bobroff (user:Jubobroff), Frederic Bouquet (user:Fbouquet), Jeffrey Quilliam, LPS, Orsay, France / CC BY-SA 3.0 (cropped)
- Unconventional Superconductivity: “Levitating HTS BSCCO piece (Meissner effect)” Winiar / CC BY-SA 3.0 (cropped)
- Quantum Liquid Crystals: “Nematic liquid crystal” Ingo Dierking / CC BY-SA 4.0 (cropped)
- Kagome-Lattice Metals and Twisted Multilayer Graphene: “Kagome-lattice-bw” WilliamSix / CC BY-SA 2.5 (cropped)
- Dirac Electrons in Solids: “Fermi surface of Copper measured with 2D ACAR” Hinkeldörnchen / CC BY-SA 4.0 (cropped)
- Related lab (Condensed Matter Theory (Quantum Transport) (St) Lab): “FZU AV CR Silicon Single Crystal A” Mojmir Churavy / CC BY-SA 4.0 (cropped)
- Related lab (Optical Solid-State Physics (O) Lab): “Cold atoms experiment 02” Tomasz Kawalec / CC BY-SA 4.0 (cropped)
- Related lab (Quark-Hadron Theory (H) Lab): “-A4-at-144-dpi” Pcharito / CC BY-SA 3.0 (cropped)
- Related lab (Nanomagnetism and Spin Physics (J) Lab): “Magnetic stripe domains” DMGualtieri / CC BY-SA 3.0 (cropped)
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