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Okumura Lab
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The lab explores novel material properties arising from electrons and spins through theory and computation.
AboutAbout the lab
Pioneering diverse physical phenomena through theory
The Okumura Lab theoretically studies a wide range of physical phenomena in strongly correlated electron systems, where degrees of freedom such as charge, spin, and orbital are intertwined.
The lab builds models of phenomena inside materials and uncovers their properties through analytical and numerical calculations.
The lab also actively pursues collaborations with experimental groups, aiming to realize in experiments the phenomena it proposes in theory.
Key terms
- Strongly correlated electron systems
- Materials in which electrons strongly influence one another, so that properties such as charge, spin, and orbital are intertwined and give rise to a wide variety of phenomena
- Magnetic monopole
- A magnet-like particle that has only a north pole or only a south pole. Inside materials, magnetic structures that resemble it can form
- Floquet engineering
- An approach that periodically drives a material with light or similar means to artificially reshape the states of its electrons
NewsLab news
Paper in APS Open Science featured in Physics Synopsis
Collaborative study on emergent electric fields generated by domain wall motion published in Nature Physics
Received a Poster Award at the REQM2025 poster session
Collaborative study on the discovery of a new p-wave magnet published in Nature
Okumura Lab established
ResearchResearch themes
The lab studies coupled spin-charge systems such as helimagnets and altermagnets, topological magnetic structures such as magnetic skyrmions and magnetic monopoles, and topological electronic states such as Dirac and Weyl semimetals. Its methods include calculating conductivity with response theory, equilibrium and nonequilibrium simulations, and materials design using first-principles calculations.
*Illustrative imageSkyrmion Strings Driven by Electric Current
In collaboration with a German university, the lab showed that when a spin-polarized current is passed along a three-dimensional string-like skyrmion, the string becomes unstable, deforms into a helical shape, and breaks.
*Illustrative imageMagnetic Monopole Crystals Made of Spins
Magnetic hedgehogs, which are three-dimensional magnetic defects, behave like magnetic monopoles. The lab has theoretically identified the conditions under which a lattice of magnetic hedgehogs appears stably, as well as multistep topological transitions induced by a magnetic field.
*Illustrative imageWeyl States Created by Circularly Polarized Light
The lab investigated the mechanism by which a Dirac semimetal irradiated with circularly polarized light turns into a Weyl state, using the approach of Floquet engineering. In collaboration with an experimental lab at the University of Tokyo, it theoretically verified the light-induced anomalous Hall conductivity.
*Illustrative imageNonlinear Responses of Chiral Magnets
The lab proposed that nonlinear optical responses such as the photovoltaic effect appear in chiral magnets, in which spatial inversion symmetry and time-reversal symmetry are broken at the same time, and showed that these responses are large, comparable to those of Weyl semimetals.
MembersFaculty
The Okumura Lab's members consist of faculty, secretaries, postdocs, and master's students.As of 2026
- Project Associate ProfessorShun OkumuraPublications ↗
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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: “Synchronized Nano-oscillators ( )” National Institute of Standards and Technology / Public domain (cropped)
- Skyrmion Strings Driven by Electric Current: “Skyrmion vector models 3” Börge Göbel, Ingrid Mertig, Oleg A.Tretiakov / CC BY 4.0 (cropped)
- Magnetic Monopole Crystals Made of Spins: “Magnetic Monopoles ( )” National Institute of Standards and Technology / Public domain (cropped)
- Weyl States Created by Circularly Polarized Light: “Tilted dirac cones” QMartist / CC BY-SA 4.0 (cropped)
- Nonlinear Responses of Chiral Magnets: “Alpha-quartz, P3 121 and P3 221” Dispersity / CC BY-SA 4.0 (cropped)
- Related lab (Ezawa Lab): “Graphene xyz” Carbophiliac / Public domain (cropped)
- Related lab (Suetsugu Lab): “Gold Cryostat 8K-4” Onri Jay Benally / CC BY-SA 2.0 (cropped)
- Related lab (Yoshimi Lab): “Molecular Beam Epitaxy System” SJMW1987 / CC BY 4.0 (cropped)
- Related lab (Sato Lab): “Boerdijk-Coxeter helices” Carsten Steger / CC BY-SA 4.0 (cropped)
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