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Condensed Matter Theory (Quantum Transport) (St) Lab
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A lab that theoretically explores quantum transport phenomena arising from electron spin and topology.
AboutAbout the lab
Understanding the flow of electricity through spin and topology.
The Quantum Transport Theory Group (St Lab) theoretically studies the phenomena in which electricity flows through materials (transport phenomena).
The lab works on spintronics, which aims to create new electronics by using both the spin and the charge of electrons.
The lab also studies topological quantum phenomena, in which materials are classified by the topology of quantum states in solids.
Using methods from quantum statistical mechanics and quantum field theory, the lab investigates these phenomena with microscopic theory.
Key terms
- Spin
- A property of electrons that makes them behave like tiny magnets. It has a direction and is the origin of magnetism.
- Topology
- A mathematical way of thinking that classifies objects by the properties that do not change when their shape is deformed continuously.
- Magnon
- The wave of fluctuating spin directions propagating through a magnet, treated as if it were a particle.
NewsLab news
Paper by a lab member (nonlocal transport in coupled quasiperiodic Kitaev chains) published in Physical Review B
Paper by a lab member (superconducting gap structure in wallpaper fermion systems) published
Paper by a lab member (AC and DC spin currents in a ferromagnet/superconductor/normal-metal trilayer) published in Physical Review B
A lab member received the MRM2025 Poster Award at Materials Research Meeting 2025
Paper by a lab member (a model of multifold fermions with spin-orbit coupling) published in Physical Review B
ResearchResearch themes
The lab theoretically studies "quantum transport phenomena": transport phenomena such as electrical conduction in which quantum-mechanical effects, such as the interference of electron waves, are essential. With spintronics and topological materials as its main stages, the lab aims to bring forth new physical phenomena through theory.
*Illustrative imageSpintronics
The lab explores the physical phenomena produced by spin currents. Using calculations based on microscopic theory, it studies spin transport in systems where electrons and magnons are coupled, the coupling between spin and mechanical rotation, and related problems.
*Illustrative imageTopological Quantum Phenomena
Insulators can be classified further by "topological invariants." The lab searches for materials such as topological insulators, which host Dirac electrons on their surfaces, and topological semimetals and superconductors, as well as the new quantum phenomena that occur in them.
MembersFaculty
- ProfessorHiroshi Kohno
- ProfessorJohn Wojdylo
- LecturerAi Yamakage
- Project Assistant ProfessorYuta Sekino
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: “FZU AV CR Silicon Single Crystal A” Mojmir Churavy / CC BY-SA 4.0 (cropped)
- Spintronics: “Active region of the thin-film splitted Hall structure of a 3D magnetic sensor” TetyanaMarusenkova / CC BY-SA 3.0 (cropped)
- Topological Quantum Phenomena: “Carbon lattice diamond” GYassineMrabetTalk✉ This structure was created with PyMOL. / Public domain (cropped)
- Related lab (Nanomagnetism and Spin Physics (J) Lab): “Magnetic stripe domains” DMGualtieri / CC BY-SA 3.0 (cropped)
- Related lab (Condensed Matter Theory (Sc) Lab): “Suspension of a superconductor by a magnet” Julien Bobroff (user:Jubobroff), Frederic Bouquet (user:Fbouquet), Jeffrey Quilliam, LPS, Orsay, France / CC BY-SA 3.0 (cropped)
- Related lab (Optical Solid-State Physics (O) Lab): “Cold atoms experiment 02” Tomasz Kawalec / CC BY-SA 4.0 (cropped)
- Related lab (Plasma Theory (P) Lab): “Cross-section of the Wendelstein 7-X plasma vessel” Siarhei Besarab / CC BY-SA 4.0 (cropped)
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