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Yoshida Lab (Teppei Yoshida)
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The lab uses light to extract electrons from materials and probe the mystery of high-temperature superconductivity.
AboutAbout the lab
Directly observing electrons to probe the mystery of superconductivity
The Yoshida Lab uses photoemission spectroscopy to study the electronic states of materials with strong electron correlations, such as high-temperature superconductors and materials that undergo metal-insulator transitions.
More than 35 years after their discovery, the mechanism by which copper-oxide high-temperature superconductors become superconducting has still not been elucidated.
Using synchrotron radiation facilities and laboratory light sources, the lab extracts electrons directly from materials and examines them.
Undergraduate students are assigned to the Materials Science Course to carry out their graduation research (in graduate school, the Materials Science Course of the Department of Human and Environmental Studies, Graduate School of Human and Environmental Studies).
Key terms
- Angle-Resolved Photoemission Spectroscopy
- A method that shines light on a material and measures the energy and direction of the electrons ejected from it, directly probing the electronic states inside the material. Also called ARPES.
- Mott Insulator
- A material that should be a metal but does not conduct electricity because of strong repulsion between its electrons.
- Synchrotron Radiation
- Extremely bright light emitted when electrons traveling at nearly the speed of light are bent. It is used in materials research.
NewsLab news
A master's student won a poster award at the Hiroshima International Symposium on Synchrotron Radiation
A paper on the electronic states of a thermoelectric semimetal was published
A master's student won the Silver Best Poster Award at an international conference
A paper on a collaborative study of trilayer high-temperature superconductors was published
A paper on a collaborative study of thermoelectric semimetals was published
ResearchResearch themes
Using photoemission spectroscopy as its main experimental method, the lab studies the electronic structure of high-temperature superconductors and strongly correlated electron systems.
*Illustrative imageElectronic Structure of High-Temperature Superconductors
Aiming to clarify how electrons form pairs in high-temperature superconductors, the lab directly observes electronic structure, such as the electronic bands, the Fermi surface, and the superconducting gap, using angle-resolved photoemission spectroscopy with synchrotron radiation.
*Illustrative imageElectrons Between Metal and Insulator
Using photoemission spectroscopy, the lab studies materials close to Mott insulators, where electron correlations are strong, and has revealed the "pseudogap" state, in which some of the electrons cannot carry electric current. The lab is exploring here the background that gives rise to high-temperature superconductivity.
MembersFaculty
The members of the Yoshida Lab consist of faculty and master's and undergraduate students.As of 2026
- ProfessorTeppei Yoshida
- Assistant ProfessorYitong Chen
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: “European Synchrotron Radiation Facility (ESRF) - Grenoble, France” Anders Sandberg from Oxford, UK / CC BY 2.0 (cropped)
- Electronic Structure of High-Temperature Superconductors: “ARPES constant energy map near Fermi level given in momentum units” Ponor / CC BY-SA 4.0 (cropped)
- Electrons Between Metal and Insulator: “Cuphasediag” 作者不詳 / Public domain (cropped)
- Related lab (Fujiwara Lab): “Diamond Anvil Cell - Cross Section-tr” Original work: Tobias1984, Translation: VectorVoyager / CC BY-SA 3.0 (cropped)
- Related lab (Adachi Lab): “Interference of Waves” Psgs123xyz / Public domain (cropped)
- Related lab (Neutral Atom Laser Cooling and Trapping Lab): “QuEra Aquila Magneto-Optical Trap” QuEra Computing, Inc. / CC BY 4.0 (cropped)
- Related lab (Stochastic Analysis Lab): “Random walk simulation” Sławomir Biały / CC BY-SA 4.0 (cropped)
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