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Tsuchiura Lab
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The lab theoretically explores topological superconductivity and magnetism.
AboutAbout the lab
Exploring topological superconductivity and magnetism through theory
The Tsuchiura Lab (Quantum Computational Materials Science Division) theoretically studies the properties of superconductors and magnetic materials with topological quantum states, and the new functions that can be built on them.
Building on methods from theoretical physics and quantum computation, the lab also uses first-principles calculations and data-science approaches.
It is a new lab, established in October 2023.
Key terms
- Topological
- A way of classifying electronic states by properties that do not change under continuous deformation.
- First-principles calculation
- A method of calculating the electronic states of a material from the fundamental laws of quantum mechanics, without relying on experimentally obtained values.
- Majorana zero mode
- A special state that appears in topological superconductors, in which particle and antiparticle are indistinguishable.
- Josephson diode effect
- A phenomenon in which the ease of current flow across a superconductor junction differs depending on the direction.
- Spin reorientation transition
- A phenomenon in which the magnetization direction of a magnet rotates to a different direction as the temperature changes.
NewsLab news
A paper co-authored with a master's student was published in Journal of Physics: Conference Series
A paper co-authored with a doctoral student was published in Applied Physics Letters
A master's exchange student won the Outstanding Poster Prize at the international conference ICT2025
A paper on the magnetoelastic effect in YCo5 was published in Phys. Rev. Materials
ResearchResearch themes
The lab explores the properties of superconductors and magnetic materials with topological quantum states, and the new functions that exploit them, using methods from theoretical physics and quantum computation. Through computation, it examines phenomena that appear at surfaces and junctions in superconductors, and, in magnets, phenomena related to heat and electricity as well as magnetic anisotropy.
*Illustrative imageSurface Superconductivity in Nodal-Line Semimetals
Using a simple model, the lab calculates how the nearly flat "drumhead" bands on the surface of nodal-line semimetals bias the pairing symmetry of surface superconductivity. The results show that chiral p-wave order is strongly enhanced in the outermost layer.
*Illustrative imageJosephson Diode Effect in Kitaev Ladders
This is joint research with researchers at ETH Zurich. The lab shows that in junctions between Kitaev ladders, each made of two coupled Kitaev chains, a Josephson diode effect arises via Majorana zero modes. The current-phase relation becomes asymmetric depending on direction.
*Illustrative imageThermal Switch Using Spin Reorientation
This is joint research with researchers at Kyoto University. Using the spin reorientation transition of the magnet DyCo5, in which the magnetization direction changes with temperature, the lab theoretically proposes a thermal switch that changes heat flow by itself without sensors. First-principles calculations estimate that the transverse thermoelectric response changes by about two orders of magnitude across the transition.
*Illustrative imageA New Understanding of Magnetism in DyCo5
This is joint research with researchers at Uppsala University, TU Darmstadt, and elsewhere. Combining two kinds of theoretical calculations with experiments on DyCo5 single crystals in strong magnetic fields of up to 14 tesla, the lab reproduces the behavior near the compensation point, where the magnetizations cancel each other, as well as the spin reorientation, and explains the underlying mechanism.
MembersFaculty
The Tsuchiura Lab consists of faculty members and doctoral, master's, and undergraduate students.As of 2026
- Associate ProfessorHiroki Tsuchiura
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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: “Superconducting levitation and candle on a magnet” Julien Bobroff (user:Jubobroff), Frederic Bouquet (user:Fbouquet), LPS, Orsay, France / CC BY-SA 3.0 (cropped)
- Surface Superconductivity in Nodal-Line Semimetals: “Melonite crystal structure (Wyckoff 1963) along a axis” Ra'ike (Wikipedia) / CC0 (cropped)
- Josephson Diode Effect in Kitaev Ladders: “Josephson Traveling Wave Parametric Amplifier (J-TWPA)” OJB Quantum / CC BY 4.0 (cropped)
- Thermal Switch Using Spin Reorientation: “Pin fin heat sink with a z-clip” Dtc5341 / Public domain (cropped)
- A New Understanding of Magnetism in DyCo5: “Magnetic domain by Zureks” Zureks, Chris Vardon / CC BY-SA 3.0 (cropped)
- Related lab (Shimizu Lab): “Superconducting Quantum Chip with Dispersive Background 3” OJB Quantum / CC BY 4.0 (cropped)
- Related lab (Awaji Lab): “Superconducting magnet. The effect of a constant magnetic field” Hzofia74 / CC BY 4.0 (cropped)
- Related lab (Yamashita-Kato Lab): “Measuring a qubit leaves no room for error” FMNLab / CC BY 4.0 (cropped)
- Related lab (Systems and Control Engineering (Sugita) Lab): “Optical Therapeutics and Medical Nanophotonics Laboratory ( )” The U.S. Food and Drug Administration / Public domain (cropped)
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