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Yoshimi Lab
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The lab explores topological quantum materials using thin films built up atom by atom.
AboutAbout the lab
Growing thin films in-house to pursue topological physics
The Yoshimi Lab fabricates thin films of solid-state materials, as well as interfaces between stacked dissimilar materials, and studies their properties.
It focuses in particular on "topological" properties that arise from the symmetry of the band structure and magnetic structure.
Using a method called molecular beam epitaxy, the lab arranges atoms in an ordered fashion on a substrate to grow high-quality crystals with few defects.
Newly established in the Department of Advanced Materials Science, the lab accepts undergraduate thesis students from the Department of Applied Physics in the Faculty of Engineering.
Key terms
- Topological insulator
- A special material that does not conduct electricity in its interior but conducts electricity only on its surface
- Molecular beam epitaxy
- A method of making thin films by gradually directing atoms or molecules onto a substrate in a vacuum, building up a crystal one layer at a time
- Quantum anomalous Hall effect
- A quantum phenomenon in which current flows along the edge of a sample without energy loss, even without an externally applied magnetic field
NewsLab news
A paper by a master's student was published in Applied Physics Letters
The Yoshimi Lab was established in the Department of Advanced Materials Science
ResearchResearch themes
The lab uses molecular beam epitaxy to grow thin films of "topological quantum materials," whose properties are determined by mathematical concepts such as symmetry and topology. It designs two-dimensional systems at surfaces and interfaces and controls their quantum properties with electric fields and magnetism, aiming to lead to new devices.
*Illustrative imageInterfaces between Topological Insulators and Magnets
This research stacks a topological insulator and a ferromagnetic insulator to produce a magnetic proximity effect at the interface. The quantum anomalous Hall effect was first observed using this approach. The lab uses interfaces to open up new functionalities.
*Illustrative imageExploring Functionality in Magnetic Rashba Semiconductors
The lab adds magnetic elements to Rashba semiconductors, in which spatial inversion symmetry is broken, to make them ferromagnetic, and investigates their properties. Current-induced switching of magnetization and a diode effect, in which resistance depends on the direction of the current, have been observed.
MembersFaculty
The members of the Yoshimi Lab consist of faculty, master's and undergraduate students, and project specialist staff.As of 2026
- Associate ProfessorRyutaro Yoshimi
- Assistant ProfessorMoeta Tsukamoto
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: “Molecular Beam Epitaxy System” SJMW1987 / CC BY 4.0 (cropped)
- Interfaces between Topological Insulators and Magnets: “Bi2Te3-Sb2Te3-TEM2” Markus Eschbach, Ewa Młyńczak, Jens Kellner ほか
/ CC BY 4.0 (cropped) - Exploring Functionality in Magnetic Rashba Semiconductors: “Germanium(II)-tellurid” Speedpera / CC BY 4.0 (cropped)
- Related lab (Suetsugu Lab): “Gold Cryostat 8K-4” Onri Jay Benally / CC BY-SA 2.0 (cropped)
- Related lab (Tsukazaki Lab): “Tetrahedral amorphous carbon thin film” Daniel Schwen / CC BY-SA 3.0 (cropped)
- Related lab (Fujishiro Lab): “SPring-8” Koji101 / CC BY 3.0 (cropped)
- Related lab (Kofu Lab (KOFU Group)): “J-PARC Materials and Life Science Experimental Facility Experimental Hall No. 1 Neutron Instruments” Kestrel / CC BY-SA 4.0 (cropped)
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