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Ezawa Lab
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A theory lab that explores the topological properties of atomic-layer materials and skyrmions.
AboutAbout the lab
Applied physics where topology meets quantum mechanics.
The Ezawa Lab theoretically studies the properties of materials in which topology and quantum mechanics play a role.
Its subjects include atomic-layer materials such as silicene, graphene, and skyrmions in magnetic materials.
Following the principle of "from the fundamentals of physics to the proposal of devices," the lab has also proposed devices such as a topological quantum transistor that is switched by an electric field.
Key terms
- Topological insulator
- A material that does not conduct electricity in its interior, but does conduct it along its edges or surface
- Dirac equation
- An equation for electrons based on the theory of relativity. Electrons in graphene follow it and behave as if they have no mass
- Valley
- A "valley" in a crystal where the energy of electrons is low. In materials such as graphene there are several, and which valley an electron is in can be used to carry information
ResearchResearch themes
Using the concepts of topology, the lab theoretically studies the properties of atomic-layer materials, graphene, and topological structures in magnetic materials. Its scope runs from the fundamentals of physics to the proposal of devices.
*Illustrative imageAtomic-layer materials such as silicene
The lab theoretically investigates the properties of atomic-layer materials as topological insulators, including silicene (silicon arranged in a honeycomb lattice), germanene (germanium), and stanene (tin).
*Illustrative imageValleytronics
This research applies the "valley" degree of freedom of electrons in honeycomb structures in the same way as spin. The lab has shown theoretically, for example, that in silicene, different valleys absorb right and left circularly polarized light.
*Illustrative imageDirac electron systems
The lab theoretically investigates the properties of materials in which electrons are described by the massless Dirac equation, such as graphene, a sheet of carbon atoms one atom thick.
*Illustrative imageSkyrmions in magnetic materials
The lab theoretically studies vortex-like topological structures (skyrmions and merons) that form in ferromagnets. In collaboration with researchers abroad, it has shown mechanisms such as one that converts between domain walls and skyrmions.
MembersFaculty
- LecturerMotohiko EzawaPublications ↗
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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: “Graphene xyz” Carbophiliac / Public domain (cropped)
- Atomic-layer materials such as silicene: “Graphen” AlexanderAlUS / CC BY-SA 3.0 (cropped)
- Valleytronics: “Monolayer MoS2 photoluminesence at 4K” MarcoM90 / CC BY-SA 4.0 (cropped)
- Dirac electron systems: “Graphen” AlexanderAlUS / CC BY-SA 3.0 (cropped)
- Skyrmions in magnetic materials: “Neel skyrmion coneplot” Forschungszentrum Jülich / CC BY 4.0 (cropped)
- Related lab (Okumura Lab): “Synchronized Nano-oscillators ( )” National Institute of Standards and Technology / Public domain (cropped)
- Related lab (Murakami Lab): “Möbius strip” David Benbennick / CC BY-SA 3.0 (cropped)
- Related lab (Sato Lab): “Boerdijk-Coxeter helices” Carsten Steger / CC BY-SA 4.0 (cropped)
- Related lab (Kobayashi Lab): “Snowflake macro photography 1” Alexey Kljatov / CC BY-SA 4.0 (cropped)
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