35 citations · 100 across the 11 of their papers we have counts for
12 papers
Effect of interaction range on the phase diagram of magnetic hedgehog lattices
Midori Yamada, Kotaro Shimizu, Shun Okumura +2
Topological spin textures have attracted considerable attention through their emergent electromagnetic properties, including the topological Hall effect and the topological Nernst…
Weaving Hopfions from Emergent Monopoles in a Chiral Magnet
Shoya Kasai, Kotaro Shimizu, Shun Okumura +1
Recent advances in three-dimensional magnetization imaging techniques have opened new avenues for exploring topological spin textures beyond domain walls and skyrmions. Among them,…
Three-dimensional Topological Superstructure of Magnetic Hopfions Threaded by Meron Strings in Easy-plane Magnets
Shoya Kasai, Kotaro Shimizu, Shun Okumura +2
Topological spin textures exhibit a hierarchical nature. For instance, magnetic skyrmions, which possess a particle-like nature, can aggregate to form superstructures such as skyrm…
Soliton penetration from edges in a monoaxial chiral magnet
Kotaro Shimizu, Shun Okumura, Yasuyuki Kato +1
The magnetic solitons such as chiral solitons, magnetic skyrmions, and magnetic hopfions, exhibiting particlelike nature widely emerge in magnets depending on spatial dimension. As…
Current-induced motion of nanoscale magnetic torons over the wide range of the Hall angle
Kotaro Shimizu, Shun Okumura, Yasuyuki Kato +1
Current-driven dynamics of spin textures plays a pivotal role in potential applications for electronic devices. While two-dimensional magnetic skyrmions with topologically nontrivi…
Emergent electric field from magnetic resonances in a one-dimensional chiral magnet
Kotaro Shimizu, Shun Okumura, Yasuyuki Kato +1
The emergent electric field (EEF) is a fictitious electric field acting on conduction electrons through the Berry phase mechanism. The EEF is generated by the dynamics of noncollin…
Crystallization dynamics of magnetic skyrmions in a frustrated itinerant magnet
Kotaro Shimizu, Gia-Wei Chern
We investigate the phase ordering kinetics of skyrmion lattice (SkL) in a metallic magnet. The SkL can be viewed as a superposition of magnetic stripes whose periods are determined…
Phase degree of freedom and topology in multiple- spin textures
Kotaro Shimizu, Shun Okumura, Yasuyuki Kato +1
A periodic array of topological spin textures, such as skyrmions and hedgehogs, is called the multiple- spin texture, as it is represented by a superposition of multiple spin de…
Phase shift, ellipticity, angle, and topological number in skyrmion lattices
Kotaro Shimizu, Shun Okumura, Yasuyuki Kato +1
We theoretically study skyrmion lattices realized in a Kondo lattice model on a triangular lattice, focusing on the phase, ellipticity, and angle of the constituent multiple- wa…
Phase transitions between helices, vortices, and hedgehogs driven by spatial anisotropy in chiral magnets
Kotaro Shimizu, Shun Okumura, Yasuyuki Kato +1
Superpositions of spin helices can yield topological spin textures, such as two-dimensional vortices and skyrmions, and three-dimensional hedgehogs. Their topological nature and sp…
Spin moiré engineering of topological magnetism and emergent electromagnetic fields
Kotaro Shimizu, Shun Okumura, Yasuyuki Kato +1
A superposition of spin helices can yield topological spin textures, such as skyrmion and hedgehog lattices. Based on the analogy with the moiré in optics, we study the magnetic an…
Theoretical study on the slit experiments in the Rashba electron systems
Kotaro Shimizu, Masahito Mochizuki
We develop a theory of designing slit experiments in two-dimensional electron systems with the Rashba spin-orbit interaction. By simulating the spatiotemporal dynamics of electrons…