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Mathematical Physics Engineering Lab
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A lab that uses theory to elucidate quantum condensed matter, including superconductivity.
AboutAbout the lab
Explaining the behavior of superconductors through theory
The Mathematical Physics Engineering Lab conducts theoretical research on quantum condensed matter, centered on superconductors.
In quantum condensed matter, many particles behave cooperatively, giving rise to states that cannot be predicted from a single particle.
Superconductivity is a representative example: electrons form Cooper pairs, electrical resistance disappears, and magnetic fields are expelled.
Focusing on the topological properties of quantum states and the internal degrees of freedom of Cooper pairs, the lab works to elucidate new superconducting states.
Key terms
- Superconductivity
- A phenomenon in which, when a material is cooled below a certain temperature, its electrical resistance disappears and it expels magnetic fields
- Cooper pair
- A pair of two bound electrons that underlies superconductivity
- Majorana quasiparticle
- A quasiparticle with the rare property that a particle and its antiparticle can be regarded as the same
ResearchResearch themes
The lab theoretically investigates how states that cannot be predicted from the picture of a single particle emerge in quantum condensed matter, centered on superconductors. It aims to elucidate new superconducting states and to pioneer quantum phenomena that occur in superconducting devices.
*Illustrative imageQuantum Transport in Superconducting Junctions
Connecting a superconductor to a metal, insulator, semiconductor, or magnet produces quantum phenomena that do not appear in the individual materials. By combining field-theoretic analysis with numerical calculations using the recursive Green's function method, the lab uncovers from theory how current flows through junction systems.
*Illustrative imageTopological Superconductivity and Majorana Quasiparticles
In superconductors characterized by the topological structure of their wave functions, special quasiparticles appear at boundaries and defects. One of these is the Majorana quasiparticle, and the lab works to elucidate the anomalous electrical conduction properties that such superconductors show.
*Illustrative imageOdd-Frequency Cooper Pairs
These are special Cooper pairs whose wave function is an odd function of time, and they show a paramagnetic response that draws in magnetic fields. Using analysis based on Gor'kov Green's functions, the lab investigates how this response arises and the origin of the complex superconducting phase diagrams.
MembersFaculty
The members of the Mathematical Physics Engineering Lab consist of faculty members, doctoral students, master's students, undergraduate students, and research fellows.As of 2026
- ProfessorYasuhiro Asano
- Associate ProfessorSatoshi Ikegaya
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: “Meissner effect p1390048” Mai-Linh Doan / CC BY-SA 3.0 (cropped)
- Quantum Transport in Superconducting Junctions: “24 Transmon Qubits Patterned by Direct Write LASER Lithography” OJB Quantum / CC BY 4.0 (cropped)
- Topological Superconductivity and Majorana Quasiparticles: “Hopf Fibration” Niles Johnson / CC BY 4.0 (cropped)
- Odd-Frequency Cooper Pairs: “Bulk Ag, Fermi surface” Alberto Marmodoro / CC BY-SA 3.0 (cropped)
- Related lab (物性物理工学): “CdTe quantum dots” Ruslan.Ka / CC BY 4.0 (cropped)
- Related lab (固体物理学): “WF111-Anderson transition-multifractal” RudoRoemer / CC BY-SA 3.0 (cropped)
- Related lab (量子機能工学): “Optical Therapeutics and Medical Nanophotonics Laboratory ( )” The U.S. Food and Drug Administration / Public domain (cropped)
- Related lab (トポロジー理工学): “Möbius strip” David Benbennick / CC BY-SA 3.0 (cropped)
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