75 citations · 444 across the 21 of their papers we have counts for
21 papers
Topological phase transitions by time-dependent electromagnetic fields in frustrated magnets: Role of dynamical and static magnetic fields
Tatsuya Shirato, Ryota Yambe, Satoru Hayami
We theoretically investigate the effects of time-dependent electromagnetic fields on frustrated magnets with the spatial inversion symmetry. Two types of external-field setups are…
Symmetry Rules on Multipole Interactions under Crystallographic Point Groups and Application to Multiple- Multipole States
Ryota Yambe, Satoru Hayami
Multipole degrees of freedom describe the mutual interplay among the charge, spin, and orbital degrees of freedom in electrons, which provides a microscopic understanding of unconv…
Bimeron Crystals by a Linearly Polarized AC Electric Field in Frustrated Magnets
Tatsuya Shirato, Ryota Yambe, Satoru Hayami
We theoretically propose a method to generate topological spin textures by irradiating a classical spin system with a linearly polarized AC electric field. To this end, we investig…
Stabilization mechanisms of magnetic skyrmion crystal and multiple- states based on momentum-resolved spin interactions
Satoru Hayami, Ryota Yambe
Multiple- states as represented by a magnetic skyrmion crystal and hedgehog crystal have been extensively studied in recent years owing to their unconventional physical properti…
Dynamical generation of skyrmion and bimeron crystals by a circularly polarized electric field in frustrated magnets
Ryota Yambe, Satoru Hayami
A skyrmion crystal (SkX) has attracted much attention in condensed matter physics, since topologically nontrivial structures induce fascinating physical phenomena. The SkXs have be…
Scalar spin chirality induced by a circularly polarized electric field in a classical kagome magnet
Ryota Yambe, Satoru Hayami
Noncoplanar magnetic states with a scalar spin chirality have been intensively studied in condensed matter physics, since they exhibit fascinating physical phenomena. We theoretica…
Analysis of photo-induced chirality and magnetic toroidal moment based on Floquet formalism
Satoru Hayami, Ryota Yambe, Hiroaki Kusunose
We analyze the condition of photo-induced atomic-scale chirality and magnetic toroidal moment. By performing a high-frequency expansion in the Floquet formalism, we derive an effec…
Non-coplanar helimagnetism in the layered van-der-Waals metal DyTe
Shun Akatsuka, Sebastian Esser, Shun Okumura +10
Magnetic materials with highly anisotropic chemical bonding can be exfoliated to realize ultrathin sheets or interfaces with highly controllable optical or spintronics responses, w…
Field-direction-dependent skyrmion crystals in noncentrosymmetric cubic magnets: A comparison between point groups and
Satoru Hayami, Ryota Yambe
We investigate the instability toward a skyrmion crystal (SkX) in noncentrosymmetric cubic magnets with an emphasis on a comparison between point groups and . By…
Symmetry analysis of light-induced magnetic interactions via Floquet engineering
Ryota Yambe, Satoru Hayami
Anisotropic magnetic interactions become the origins of intriguing magnetic structures, such as helical and skyrmion structures by the Dzyaloshinskii-Moriya interaction. In general…
Anisotropic spin model and multiple- states in cubic systems
Ryota Yambe, Satoru Hayami
Multiple- states manifest themselves in a variety of noncollinear and noncoplanar magnetic structures depending on the magnetic interactions and lattice structures. In particula…
Ferrochiral, antiferrochiral, and ferrichiral skyrmion crystals in an itinerant honeycomb magnet
Ryota Yambe, Satoru Hayami
Topological spin textures, such as a skyrmion crystal, are a source of unusual physical phenomena owing to the interplay between magnetism and topology. Since physical phenomena de…
Engineering a skyrmion crystal in ferromagnetic/antiferromagnetic bilayers free from the DM interaction
Kazuki Okigami, Ryota Yambe, Satoru Hayami
We theoretically propose a new stabilization mechanism of a skyrmion crystal (SkX) in a bilayer triangular lattice system consisting of the ferromagnetic and the antiferromagnetic…
Skyrmion crystal under point group: Role of out-of-plane Dzyaloshinskii-Moriya interaction
Satoru Hayami, Ryota Yambe
The Dzyaloshinkii-Moriya (DM) interaction that originates from relativistic spin-orbit coupling in noncentrosymmetric magnets is a source of topological spin textures. We theoretic…
Helicity locking of square skyrmion crystal in a centrosymmetric lattice system without vertical mirror symmetry
Satoru Hayami, Ryota Yambe
We theoretically investigate the stability of a square skyrmion crystal (SkX) in a centrosymmetric tetragonal lattice structure with the emphasis on the role of the magnetic anisot…
Effective spin model in momentum space: Toward a systematic understanding of multiple- instability by momentum-resolved anisotropic exchange interactions
Ryota Yambe, Satoru Hayami
Multiple- magnetic states, such as a skyrmion crystal, become a source of unusual transport phenomena and dynamics. Recent theoretical and experimental studies clarify that such…
Meron-antimeron crystals in noncentrosymmetric itinerant magnets on a triangular lattice
Satoru Hayami, Ryota Yambe
Multiple- magnetic states often induce nontrivial topological spin textures, such as a skyrmion and a hedgehog. We theoretically investigate yet another multiple- state with…
Locking of skyrmion cores on a centrosymmetric discrete lattice: onsite versus offsite
Satoru Hayami, Ryota Yambe
A magnetic skyrmion crystal (SkX) with a swirling spin configuration, which is one of topological spin crystals as a consequence of an interference between multiple spin density wa…
Field-Direction Sensitive Skyrmion Crystals in Cubic Chiral Systems: Implication to -Electron Compound EuPtSi
Satoru Hayami, Ryota Yambe
We theoretically study the stability of magnetic skyrmion crystals (SkXs) in chiral cubic antiferromagnets with the EuPtSi hosting unconventional nanometric SkXs in mind. By perfor…
Degeneracy Lifting of Néel, Bloch, and Anti-Skyrmion Crystals in Centrosymmetric Tetragonal Systems
Satoru Hayami, Ryota Yambe
A skyrmion crystal has internal degrees of freedom in terms of vorticity and helicity, which gives rise to fascinating types of skyrmion phases (Néel, Bloch, and anti-skyrmion). We…
Double- Chiral Stripe in the - Model with Strong Spin-Charge Coupling
Ryota Yambe, Satoru Hayami
We investigate the stability of multiple- spiral states in - electron systems with the strong spin-charge coupling. By using variational calculations on a square lattice,…