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Yoshimatsu Lab
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A lab that creates new electronic devices from oxide thin films.
AboutAbout the lab
Unlocking the potential of oxides through thin films.
Yoshimatsu Lab fabricates thin films of transition metal oxides and studies their electronic properties.
Founded in August 2023, the lab makes full use of thin-film technology to create new electronic and energy devices.
Titanium oxides, the lab's main material, exhibit every electronic phase from superconducting to insulating, and are rich in phase transitions in which properties switch with light or temperature.
The lab also carries out measurements at synchrotron radiation facilities and density functional theory calculations on its own, handling the work from synthesis to characterization in one continuous process.
Key terms
- Transition metal oxides
- Compounds made of oxygen and metals from the middle of the periodic table, such as titanium and vanadium. They show a wide variety of electrical and magnetic properties.
- Synchrotron radiation
- Bright light with a uniform wavelength, emitted when the direction of accelerated electrons is bent. It is used to investigate the structure and electronic states of materials.
- Density functional theory
- A computational method that determines the energy of a material from the distribution of its electrons. It is used to predict electronic states theoretically.
NewsLab news
Paper on V2O3 thin films published in Physical Review Materials
A master's student received the 60th Japan Society of Applied Physics Young Scientist Presentation Award
Paper on CuFeO2 thin films published in Crystal Growth & Design
Paper on Al, Sc, and Ga oxide thin films published in Appl. Phys. Lett.
A master's student received the Outstanding Poster Presentation Award at CSJ Chemistry Festa 2025
ResearchResearch themes
The lab uses thin-film technology to create new electronic and energy devices that take advantage of the characteristics of transition metal oxides. It also uses cutting-edge synchrotron radiation measurement techniques to pursue fundamental materials science research with electron spectroscopy and X-ray structure analysis.
*Illustrative imageTitanium oxide thin films
Titanium oxides exhibit every electronic phase, from superconducting TiO to insulating TiO2, and also show metal-insulator transitions and light-induced phase transitions. The lab believes that making them into thin films and applying lattice strain will allow even finer control over their diverse electronic properties.
*Illustrative imageProbing electrons and structure with synchrotron radiation
Bright, high-resolution synchrotron radiation reveals the true crystal structure and electronic states that cannot be seen with laboratory light sources. At KEK-PF and SPring-8, the lab uses photoemission spectroscopy, X-ray absorption spectroscopy, and X-ray diffraction to study the electrical and magnetic properties and the structure of the thin films it fabricates.
*Illustrative imageInvestigating electronic states by calculation
The lab calculates electronic states with density functional theory using Quantum ESPRESSO to deepen its understanding of experimental results obtained with synchrotron radiation. It is clarifying the band dispersion of Ti2O3 and the origin of its metal-insulator transition.
*Illustrative imageBuilding our own experimental equipment
Developing synthesis and measurement equipment in-house enables original research and leads to a deeper understanding of first principles. The lab builds pulsed laser deposition systems, low-temperature electrical resistance measurement systems, and Hall effect measurement systems, and also develops its own control programs in LabVIEW.
MembersFaculty
The members of Yoshimatsu Lab consist of faculty, master's and undergraduate students, and doctoral and master's students who have the lab as their secondary supervising lab.As of 2026
- Associate ProfessorKohei YoshimatsuPublications ↗
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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: “Pulsed Laser Deposition in Action” Adam Andersen Læssøe / CC BY-SA 4.0 (cropped)
- Titanium oxide thin films: “TiO2crystals” Materialscientist / CC BY-SA 3.0 (cropped)
- Probing electrons and structure with synchrotron radiation: “ESRF img 0853” Rama / CC BY-SA 2.0 fr (cropped)
- Investigating electronic states by calculation: “Corundum struct” Solid State / Public domain (cropped)
- Building our own experimental equipment: “Atomic-Scale Growth by Pulsed Laser Deposition ( )” Oak Ridge National Laboratory / CC BY 2.0 (cropped)
- Related lab (大友研究室): “Multicrystalline silicon wafer with thin film iridescence” Radiotrefoil / CC BY-SA 4.0 (cropped)
- Related lab (館山研究室): “Lithium-cobalt-oxide-3D-polyhedra” Ben Mills / Public domain (cropped)
- Related lab (菅野･鈴木･松井研究室): “Maarja Paalo uses a glovebox” Tavoromann / CC BY-SA 4.0 (cropped)
- Related lab (平山研究室): “Coin-cells” Gerhard H Wrodnigg / CC BY-SA 2.5 (cropped)
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