[HTML][HTML] Topological spin crystals by itinerant frustration

S Hayami, Y Motome - Journal of Physics: Condensed Matter, 2021 - iopscience.iop.org
Spin textures with nontrivial topology, such as vortices and skyrmions, have attracted
attention as a source of unconventional magnetic, transport, and optical phenomena …

Topological aspects of antiferromagnets

V Bonbien, F Zhuo, A Salimath, O Ly… - Journal of Physics D …, 2021 - iopscience.iop.org
The long fascination that antiferromagnetic materials has exerted on the scientific community
over about a century has been entirely renewed recently with the discovery of several …

Fractional antiferromagnetic skyrmion lattice induced by anisotropic couplings

S Gao, HD Rosales, FA Gomez Albarracin, V Tsurkan… - Nature, 2020 - nature.com
Magnetic skyrmions are topological solitons with a nanoscale winding spin texture that hold
promise for spintronics applications,,–. Skyrmions have so far been observed in a variety of …

Spontaneous topological Hall effect induced by non-coplanar antiferromagnetic order in intercalated van der Waals materials

H Takagi, R Takagi, S Minami, T Nomoto, K Ohishi… - Nature Physics, 2023 - nature.com
In ferromagnets, an electric current generally induces a transverse Hall voltage in proportion
to the internal magnetization. This effect is frequently used for the electrical readout of the …

Square skyrmion crystal in centrosymmetric itinerant magnets

S Hayami, Y Motome - Physical Review B, 2021 - APS
We theoretically investigate the origin of the square-type skyrmion crystal in centrosymmetric
itinerant magnets, motivated by the recent experimental findings in GdRu 2 Si 2 [ND Khanh …

[HTML][HTML] Imaging the coupling between itinerant electrons and localised moments in the centrosymmetric skyrmion magnet GdRu2Si2

Y Yasui, CJ Butler, ND Khanh, S Hayami… - Nature …, 2020 - nature.com
Magnetic skyrmions were thought to be stabilised only in inversion-symmetry breaking
structures, but skyrmion lattices were recently discovered in inversion symmetric Gd-based …

Zero-field skyrmions with a high topological number in itinerant magnets

R Ozawa, S Hayami, Y Motome - Physical Review Letters, 2017 - APS
Magnetic Skyrmions are swirling spin textures with topologically protected noncoplanarity.
Recently, Skyrmions with the topological number of unity have been extensively studied in …

Effective bilinear-biquadratic model for noncoplanar ordering in itinerant magnets

S Hayami, R Ozawa, Y Motome - Physical Review B, 2017 - APS
Noncollinear and noncoplanar magnetic textures including Skyrmions and vortices act as
emergent electromagnetic fields and give rise to novel electronic and transport properties …

Complex charge density waves at Van Hove singularity on hexagonal lattices: Haldane-model phase diagram and potential realization in the kagome metals AV 3 Sb …

YP Lin, RM Nandkishore - Physical Review B, 2021 - APS
We investigate how the real and imaginary charge density waves interplay at the Van Hove
singularity on the hexagonal lattices. A phenomenological analysis indicates the formation …

Bubble and skyrmion crystals in frustrated magnets with easy-axis anisotropy

S Hayami, SZ Lin, CD Batista - Physical Review B, 2016 - APS
We clarify the conditions for the emergence of multiple-Q structures out of lattice and easy-
axis spin anisotropy in frustrated magnets. By considering magnets whose exchange …