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Tokumoto Lab
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The lab explores how the rules governing atomic arrangement relate to electrical and thermal properties.
AboutAbout the lab
Exploring material properties from atomic arrangement
The Tokumoto Lab studies the relationship between the rules governing atomic arrangement in solids (structural order) and the properties of materials.
Atomic arrangements can show periodicity, in which the same pattern repeats, or quasiperiodicity, in which the pattern never repeats yet remains ordered.
Targeting metals, semimetals, and semiconductors, the lab investigates properties such as how electricity flows and how heat is conducted.
The research centers on quasicrystals and van der Waals layered materials.
Key terms
- Quasicrystal
- A solid with a special type of atomic arrangement: the atoms are arranged in an orderly way, yet the same pattern never repeats
- van der Waals layered material
- A material in which layers of atoms are stacked and held together by weak forces (van der Waals forces). It can easily be peeled apart layer by layer
- Topological insulator
- A material that does not conduct electricity in its interior, but conducts electricity like a metal only at its surface (edges)
- Dislocation
- A defect in a crystal in which the arrangement of atoms is displaced along a line
NewsLab news
Lab opened to visitors at the Komaba Research Campus Open House
A master's student received the Excellent Master's Thesis Award from the Department of Materials Engineering
An explanatory article on superconductivity in layered quasicrystals was published in Butsuri, the magazine of the Physical Society of Japan
Lab opened to visitors at the Komaba Research Campus Open House
A paper on superconductivity in layered quasicrystals was published in Nature Communications
ResearchResearch themes
The lab aims to clarify how the structural order of solid materials (periodicity and quasiperiodicity) is reflected in their physical properties. Focusing on quasicrystals and van der Waals layered materials, it studies the electronic and thermal properties of metals, semimetals, and semiconductors.
*Illustrative imageCreating layered quasicrystals
The lab fabricates "van der Waals layered quasicrystals," in which layers are held together by weak forces, in the Ta-Te system and measures their electronic properties. Their properties can be tuned, so new physical properties may emerge.
*Illustrative imageSuperconductivity in quasicrystals
Superconductivity in quasicrystals is a newly discovered phenomenon. The lab discovered that Ta-Te quasicrystals exhibit superconductivity, and aims to clarify its properties through experiments.
*Illustrative imageElectric current along crystal defects
Theory has shown that dislocations in topological insulators may host a special metallic state. To confirm this, the lab is conducting micro- and nanoscale electrical transport measurements.
*Illustrative imageMaking the interior of a material a poor conductor
To extract the special metallic states at surfaces and dislocations, the electric current flowing through the interior (bulk) of the material must be reduced. The lab works to increase bulk insulation by finely controlling composition.
MembersFaculty
The members of the Tokumoto Lab are faculty, technical specialists, and master's students. Students are supervised jointly with the Edagawa Lab.As of 2026
- Associate ProfessorYuki TokumotoPublications ↗
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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: “Ho-Mg-ZnQuasicrystal” AMES lab., US Department of Energy / Public domain (cropped)
- Creating layered quasicrystals: “Al-Cu-Fe-Cr decagonal quasicrystal diffraction pattern” Ldm1954 / CC BY-SA 4.0 (cropped)
- Superconductivity in quasicrystals: “Levitation meissner” Julien Bobroff (user:Jubobroff), Frederic Bouquet (user:Fbouquet), LPS, Orsay, France / CC BY-SA 3.0 (cropped)
- Electric current along crystal defects: “Weak-beam dark-field TEM image of dislocations” Liao Yifeng / CC0 (cropped)
- Making the interior of a material a poor conductor: “Tsumoite” David Hospital / CC BY-SA 4.0 (cropped)
- Related lab (Edagawa Lab (Strength and Physical Properties of Materials)): “Icosahedrite Diffraction Pattern” Paul Steinhardt / CC BY-SA 4.0 (cropped)
- Related lab (Abe Lab): “Stohrem” Materialscientist / CC BY-SA 3.0 (cropped)
- Related lab (Nagashio Lab): “Graphen” AlexanderAlUS / CC BY-SA 3.0 (cropped)
- Related lab (Electron Microscopy Materials Lab): “16 Universität Wien Sternwarte Physik Gruppe Kotakoski UltraStem Titan Ian Ehm” Ian Ehm, Universität Wien / CC BY-SA 4.0 (cropped)
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