35 citations · 51 across the 15 of their papers we have counts for
16 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,…
Floquet-Weyl states at one-photon resonances in three-dimensional topological insulators
Keiya Uehara, Ryo Okugawa, Takami Tohyama +1
Quantum materials exhibit exotic phases and electronic responses under irradiation by circularly polarized light, which breaks time-reversal symmetry and generates Floquet replica…
Creating and Driving a Twist Soliton on a Magnetic Skyrmion Tube
Shoya Kasai, Kotaro Shimizu, Shun Okumura +1
A magnetic skyrmion tube is a three-dimensional topological soliton formed by stacking two-dimensional skyrmions along the out-of-plane direction. Recent real-space observations of…
Magnetoelastic mapping of the high-field phase diagram in the topological cubic helimagnet SrFeO
Masaki Gen, Shun Okumura, Shusaku Imajo +9
The cubic perovskite SrFeO is a prototypical centrosymmetric itinerant magnet that hosts a quadruple- hedgehog-antihedgehog lattice and exhibits a complex magnet…
Spin current generation via magnetic skyrmion, bimeron, and meron crystals
Aoi Kajihara, Shun Okumura, Yukitoshi Motome
Spin current offers a promising route toward energy-efficient and high-speed information processing. Developing efficient methods for their generation remains a central challenge i…
Emergent electric field induced by dissipative sliding dynamics of domain walls in a Weyl magnet
Rinsuke Yamada, Daichi Kurebayashi, Yukako Fujishiro +10
The dynamic motion of topological defects in magnets induces an emergent electric field, as exemplified by the continuous flow of skyrmion vortices. However, the electrodynamics un…
Spiral-induced anomalous Hall effect from odd-parity spin-nodal lines
Shun Okumura, Moritz M. Hirschmann, Yukitoshi Motome
Spin spirals represent a fundamental class of noncollinear yet coplanar magnetic structures that give rise to diverse emergent phenomena through their coupling to itinerant electro…
Nonequilibrium dynamics of magnetic hopfions driven by spin-orbit torque
Shoya Kasai, Shun Okumura, Yukitoshi Motome
Hopfions--three-dimensional topological solitons with knotted spin texture--have recently garnered attention in topological magnetism due to their unique topology characterized by…
Controlling Knot Topology in Magnetic Hopfions via Spin-orbit Torque
Shoya Kasai, Shun Okumura, Yukitoshi Motome
Knots, characterized by topological invariants called the Hopf number , arise from the intertwining of strings and exhibit diverse configurations. The knot structures have recen…
Topological transition induced by selective random defects on a honeycomb lattice
Sogen Ikegami, Kiyu Fukui, Shun Okumura +2
We investigate how the spectral and topological properties of electron systems evolve on a lattice that interpolates between the honeycomb and its 1/6-depleted structures through t…
Metallic -wave magnet with commensurate spin helix
Rinsuke Yamada, Max T. Birch, Priya R. Baral +20
Antiferromagnetic states with spin-split electronic structure give rise to novel spintronic, magnonic, and electronic phenomena despite (near-) zero net magnetization. The simplest…
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…
High harmonic generation from electrons moving in topological spin textures
Atsushi Ono, Shun Okumura, Shohei Imai +1
High harmonic generation (HHG) is a striking phenomenon, which reflects the ultrafast dynamics of electrons. Recently, it has been demonstrated that HHG can be used to reconstruct…