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Project Lecturer, Institute of Industrial Science, The University of Tokyo *Profile is at the time of the award.
2024Inamori Research GrantsScience & Engineering
When considering the motion of spatially localized quasiparticles such as skyrmions, we believe that knowledge of the anomalous diffusion and relaxation dynamics of soft particles, the focus of soft matter physics, is instructive. We aim to propose universal concepts that bridge disparate phenomena in various materials, including the dynamics of skyrmions in magnetic materials and half-skyrmions in molecular crystals.
We clarified the universal features and differences in structure formation and dynamics between half-skyrmions in molecular crystals and skyrmions in magnetic systems. Owing to differences in the equations of motion, we showed that the presence or absence of an inertial mass and a gyrotropic term in the collective-coordinate equations distinguishes the two systems. As a consequence, their short-time dynamics are markedly different. In contrast, at long times, Mermin–Wagner fluctuations govern the dynamics in both systems, leading to subdiffusive behaviour.
K. Takae, K. Mitsumoto (2024) Diffusionless relaxation of half-skyrmion liquid, hexatic, and crystalline states in a chiral molecular crystal Physical Review Research 6, 043302 DOI: https://doi.org/10.1103/PhysRevResearch.6.043302
K. Mitsumoto, K. Takae (2026) Elastic heterogeneity governs anomalous dynamic scaling in a soft porous crystal Communications Physics 9, 36 DOI: https://doi.org/10.1038/s42005-026-02508-8
Science & Engineering
