Yasuyuki Kato
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View article: High-field NMR study of field-induced states in Pb(TiO)Cu$_4$(PO$_4$)$_4$
High-field NMR study of field-induced states in Pb(TiO)Cu$_4$(PO$_4$)$_4$ Open
The square cupola antiferromagnet Pb(TiO)Cu$_4$(PO$_4$)$_4$ exhibits the intriguing magnetoelectric responses arising from the consecutive change in the magnetic quadrupolar-type configuration of magnetic moments under external magnetic fi…
View article: Wannier states and spin supersolid physics in the triangular antiferromagnet K2Co(SeO3)2
Wannier states and spin supersolid physics in the triangular antiferromagnet K2Co(SeO3)2 Open
We combine ultra-high-resolution inelastic neutron scattering and quantum Monte Carlo simulations to study thermodynamics and spin excitations in the spin-supersolid phase of the triangular lattice XXZ antiferromagnet K$_2$Co(SeO$_3$)$_2$ …
View article: Wannier states and spin supersolid physics in the triangular antiferromagnet K2Co(SeO3)2
Wannier states and spin supersolid physics in the triangular antiferromagnet K2Co(SeO3)2 Open
We combine ultra-high-resolution inelastic neutron scattering and quantum Monte Carlo simulations to study thermodynamics and spin excitations in the spin-supersolid phase of the triangular lattice XXZ antiferromagnet K2Co(SeO3)2 under zer…
View article: Current-induced motion of nanoscale magnetic torons over the wide range of the Hall angle
Current-induced motion of nanoscale magnetic torons over the wide range of the Hall angle Open
Current-driven dynamics of topological spin textures plays a pivotal role in potential applications for electronic devices. While two-dimensional magnetic skyrmions have garnered significant interest, their practical use is hindered by the…
View article: Human Capital Disclosure and Equity Value in Japanese Stock Market
Human Capital Disclosure and Equity Value in Japanese Stock Market Open
View article: The Impact of ESG on Value Investing in the Japanese Stock Market
The Impact of ESG on Value Investing in the Japanese Stock Market Open
View article: Three-dimensional Topological Superstructure of Magnetic Hopfions Threaded by Meron Strings in Easy-plane Magnets
Three-dimensional Topological Superstructure of Magnetic Hopfions Threaded by Meron Strings in Easy-plane Magnets Open
Topological spin textures exhibit a hierarchical nature. For instance, magnetic skyrmions, which possess a particle-like nature, can aggregate to form superstructures such as skyrmion strings and skyrmion lattices. Magnetic hopfions are al…
View article: Soliton penetration from edges in a monoaxial chiral magnet
Soliton penetration from edges in a monoaxial chiral magnet Open
The magnetic solitons such as chiral solitons, magnetic skyrmions, and magnetic hopfions, exhibiting particlelike nature widely emerge in magnets depending on spatial dimension. As their number directly gives rise to an impact on magnetic …
View article: Large-$N$ SU(4) Schwinger boson theory for coupled-dimer antiferromagnets
Large-$N$ SU(4) Schwinger boson theory for coupled-dimer antiferromagnets Open
We develop a systematic large-$N$ expansion based on the Schwinger boson representation of SU(4) coherent states of dimers for the paradigmatic spin-$1/2$ bilayer square lattice Heisenberg antiferromagnet. This system exhibits a quantum ph…
View article: Topological transitions by magnetization rotation in kagome monolayers of the ferromagnetic Weyl semimetal Co-based shandite
Topological transitions by magnetization rotation in kagome monolayers of the ferromagnetic Weyl semimetal Co-based shandite Open
Co-based shandite Co$_3$Sn$_2$S$_2$ is a ferromagnet hosting Weyl fermions in\nthe layered Co kagome structure. The band topology as well as the magnetism is\npredicted to vary drastically in the atomically thin films depending on the\nthi…
View article: Magnetic field effects on the Kitaev model coupled to environment
Magnetic field effects on the Kitaev model coupled to environment Open
Open quantum systems display unusual phenomena not seen in closed systems,\nsuch as new topological phases and unconventional phase transitions. An\ninteresting example was studied for a quantum spin liquid in the Kitaev model\n[K. Yang, S…
View article: Current-induced motion of nanoscale magnetic torons over the wide range of the Hall angle
Current-induced motion of nanoscale magnetic torons over the wide range of the Hall angle Open
Current-driven dynamics of spin textures plays a pivotal role in potential applications for electronic devices. While two-dimensional magnetic skyrmions with topologically nontrivial spin textures have garnered significant interest, their …
View article: Topological phase diagram of the Haldane model on a Bishamon-kikko--honeycomb lattice
Topological phase diagram of the Haldane model on a Bishamon-kikko--honeycomb lattice Open
Topological flat bands have gained extensive interest as a platform for exploring the interplay between nontrivial band topology and correlation effects. In recent studies, strongly correlated phenomena originating from a topological flat …
View article: Magnetic, transport and topological properties of Co-based shandite thin films
Magnetic, transport and topological properties of Co-based shandite thin films Open
The kagome ferromagnet, Co-based shandite Co 3 Sn 2 S 2 , shows a large anomalous Hall effect (AHE) associated with the Weyl nodes. A thin film with a Co kagome monolayer was predicted to exhibit the quantum AHE, which awaits the experimen…
View article: Spin Seebeck Effect as a Probe for Majorana Fermions in Kitaev Spin Liquids
Spin Seebeck Effect as a Probe for Majorana Fermions in Kitaev Spin Liquids Open
Quantum entanglement in strongly correlated electron systems often leads to exotic elementary excitations. Quantum spin liquids (QSLs) provide a paradigmatic example, where the elementary excitations are described by fractional quasipartic…
View article: Erratum: Quadratic optical responses in a chiral magnet [Phys. Rev. B <b>104</b>, L180407 (2021)]
Erratum: Quadratic optical responses in a chiral magnet [Phys. Rev. B <b>104</b>, L180407 (2021)] Open
Received 1 December 2023DOI:https://doi.org/10.1103/PhysRevB.108.219902©2023 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasHelicoidal magnetic textureOptical conductivityPhotovoltaic effectPhysical SystemsChiral ma…
View article: Anomalous charge transport upon quantum melting of chiral spin order
Anomalous charge transport upon quantum melting of chiral spin order Open
A plethora of correlated and exotic metallic states have been identified on the border of itinerant magnetism, where the long-range spin texture is melted by tuning the magnetic transition temperature (T$_C$) towards zero, referred to as t…
View article: Field-tuned quantum renormalization of spin dynamics in the honeycomb lattice Heisenberg antiferromagnet YbCl3
Field-tuned quantum renormalization of spin dynamics in the honeycomb lattice Heisenberg antiferromagnet YbCl3 Open
The basis for our understanding of quantum magnetism has been the study of elegantly simple model systems. However, even for the antiferromagnetic honeycomb lattice with isotropic spin interactions–one of the simplest model systems–a detai…
View article: Emergent electric field from magnetic resonances in a one-dimensional chiral magnet
Emergent electric field from magnetic resonances in a one-dimensional chiral magnet Open
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 noncollinear spin configurations and becomes nonzero even in one dim…
View article: Berry curvature contributions of kagome-lattice fragments in amorphous Fe–Sn thin films
Berry curvature contributions of kagome-lattice fragments in amorphous Fe–Sn thin films Open
Amorphous semiconductors are widely applied to electronic and energy-conversion devices owing to their high performance and simple fabrication processes. The topological concept of the Berry curvature is generally ill-defined in amorphous …
View article: High-field phase diagram of the chiral-lattice antiferromagnet Sr(TiO)Cu4(PO4)4
High-field phase diagram of the chiral-lattice antiferromagnet Sr(TiO)Cu4(PO4)4 Open
High-field phase diagram of a chiral-lattice antiferromagnet Sr(TiO)Cu4(PO4)4 is studied by means of the ultrasound, dielectric, and magnetocaloric-effect measurements. These experimental techniques reveal two new phase transitions at high…
View article: Magnetic bubble crystal in tetragonal magnets
Magnetic bubble crystal in tetragonal magnets Open
A magnetic bubble crystal is a two-dimensional soliton lattice consisting of multiple spin density waves similar to a magnetic skyrmion crystal. Nevertheless, the emergence of the bubble crystal with a collinear spin texture is rare compar…
View article: Ground-State Phase Diagram of the Kitaev-Heisenberg Model on a Three-dimensional Hyperhoneycomb Lattice
Ground-State Phase Diagram of the Kitaev-Heisenberg Model on a Three-dimensional Hyperhoneycomb Lattice Open
The Kitaev model, which hosts a quantum spin liquid (QSL) in the ground state, was originally defined on a two-dimensional honeycomb lattice, but can be straightforwardly extended to any tricoordinate lattices in any spatial dimensions. In…
View article: Magnetic, transport and topological properties of Co-based shandite thin films
Magnetic, transport and topological properties of Co-based shandite thin films Open
The kagome ferromagnet, Co-based shandite Co3Sn2S2, shows a large anomalous Hall effect (AHE) associated with the Weyl nodes. A thin film with a Co kagome monolayer was predicted to exhibit the quantum AHE, which awaits the experimental re…
View article: Report of Accidental Anchoring of an Impella Device to a Perceval Bioprosthesis in a Patient
Report of Accidental Anchoring of an Impella Device to a Perceval Bioprosthesis in a Patient Open
View article: Hidden Topological Transitions in Emergent Magnetic Monopole Lattices
Hidden Topological Transitions in Emergent Magnetic Monopole Lattices Open
Topological defects, called magnetic hedgehogs, realize emergent magnetic monopoles, which are not allowed in the ordinary electromagnetism described by Maxwell's equations. Such monopoles were experimentally discovered in magnets in two d…
View article: Widely-sweeping magnetic field-temperature phase diagrams for skyrmion-hosting centrosymmetric tetragonal magnets
Widely-sweeping magnetic field-temperature phase diagrams for skyrmion-hosting centrosymmetric tetragonal magnets Open
We numerically investigate the stabilization mechanisms of skyrmion crystals under thermal fluctuations and external magnetic field in itinerant centrosymmetric tetragonal magnets. By adopting an efficient steepest descent method with a sm…
View article: Ground-state phase diagram of spin-$S$ Kitaev-Heisenberg models
Ground-state phase diagram of spin-$S$ Kitaev-Heisenberg models Open
The Kitaev model, whose ground state is a quantum spin liquid (QSL), was originally conceived for spin $S=1/2$ moments on a honeycomb lattice. In recent years, the model has been extended to higher $S$ from both theoretical and experimenta…
View article: Electrical conductivity in helical and conical magnetic states
Electrical conductivity in helical and conical magnetic states Open
We theoretically study the electrical conductivity in a one-dimensional helimagnet whose spin texture changes from helimagnetic to conical magnetic, and to forced ferromagnetic state while increasing the magnetic field along the helical ax…
View article: Phase shift, ellipticity, angle, and topological number in skyrmion lattices
Phase shift, ellipticity, angle, and topological number in skyrmion lattices Open
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- Q waves. Analyzing the numerical data obtained in the previous s…