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Katsufuji Lab
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A lab that creates new materials and searches for the new physical properties that electrons give rise to.
AboutAbout the lab
New materials give rise to new physical properties.
The Katsufuji Lab creates new materials and investigates the new behavior that electrons show in them.
Electrons in a crystal feel forces from atomic nuclei and exert forces on one another, and together they give rise to a wide variety of properties as a collective.
Becoming a metal that conducts electricity, sticking to a magnet, and having zero electrical resistance are all examples.
The lab focuses on “strongly correlated materials,” mainly transition metal oxides, and studies them using methods such as optical techniques.
Key terms
- Strongly correlated materials
- Materials in which electrons strongly influence one another and behave collectively. They are often found among transition metal oxides.
- Transition metal oxides
- Compounds formed by transition metals such as titanium and vanadium combined with oxygen.
- Response to external fields
- The changes a material shows when an electric field, magnetic field, force, or other influence is applied from outside.
NewsLab news
Discovery of 4s electrons in oxygen-deficient rock-salt TiO and VO
Discovery of a novel phenomenon in the Jahn-Teller effect
ResearchResearch themes
The lab studies a group of materials called “strongly correlated materials,” mainly transition metal oxides. In these materials the Coulomb interaction between d electrons is strong and spin and orbital degrees of freedom are coupled, giving rise to unusual responses to external fields. The lab investigates these responses using optical methods and a variety of other approaches.
*Illustrative imageDeveloping new transition metal oxides
Creating a new material also means creating a new stage for electrons. Focusing on transition metal oxides, the lab synthesizes materials that are not yet known and searches for the physics hidden in them.
*Illustrative imageMaterials with giant responses to external fields
Strongly correlated materials often show large responses, such as electrical conductivity changing when an electric field is applied or the electronic structure changing when strain is applied. The lab develops materials that show such responses and investigates the mechanisms behind them.
*Illustrative imageAnalyzing electronic states by optical measurements
The lab studies the electronic states of strongly correlated materials, mainly using optical methods. It also uses pump-probe spectroscopy, which follows changes over time, to study phenomena such as phase transitions induced by light.
MembersFaculty
The Katsufuji Lab consists of faculty members, master's students, and undergraduate students.As of 2026
- ProfessorTakuro Katsufuji
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: “Pulsed Laser Deposition in Action” Adam Andersen Læssøe / CC BY-SA 4.0 (cropped)
- Developing new transition metal oxides: “Crystals growing from melted sulfur” AlexmarPhoto / CC BY 4.0 (cropped)
- Materials with giant responses to external fields: “Magnet 4” Peter Nussbaumer / CC BY-SA 3.0 (cropped)
- Analyzing electronic states by optical measurements: “Optical table - Up view” Giorgio Brida from Torino, Italy / CC BY 2.0 (cropped)
- Related lab (Yuasa Lab): “IQM Quantum Computer Espoo Finland” Ragsxl / CC BY-SA 4.0 (cropped)
- Related lab (Nakazato Lab): “Double slit interference” Aleksandr Berdnikov / CC BY-SA 4.0 (cropped)
- Related lab (Inoe Lab): “Webb's First Deep Field” NASA, ESA, CSA, and STScI / Public domain (cropped)
- Related lab (Ueda Lab): “Osteosarcoma cells stained for actin, microtubules, and nuclei” Howard Vindin / CC BY 4.0 (cropped)
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