224 citations · 2.2k across the 82 of their papers we have counts for
9 papers · 1 filter
Electrical conductivity in helical and conical magnetic states
Shun Okumura, Takahiro Morimoto, Yasuyuki Kato +1
We theoretically study the electrical conductivity in a one-dimensional helimagnet whose spin texture changes from helimagnetic to conical magnetic, and to forced ferromagnetic sta…
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…
Spin excitation spectra in helimagnetic states: proper-screw, cycloid, vortex crystal, and hedgehog lattice
Yasuyuki Kato, Satoru Hayami, Yukitoshi Motome
We investigate the spin excitation spectra in chiral and polar magnets by the linear spin-wave theory for an effective spin model with symmetric and antisymmetric long-range intera…
Determinant-free fermionic wave function using feed-forward neural networks
Koji Inui, Yasuyuki Kato, Yukitoshi Motome
We propose a general framework for finding the ground state of many-body fermionic systems by using feed-forward neural networks. The anticommutation relation for fermions is usual…
Quadratic Optical Responses in a Chiral Magnet
Shun Okumura, Takahiro Morimoto, Yasuyuki Kato +1
Chiral magnets, which break both spatial inversion and time reversal symmetries, carry a potential for quadratic optical responses. Despite the possibility of enhanced and controll…
A quantum Monte Carlo method on asymptotic Lefschetz thimbles for quantum spin systems: An application to the Kitaev model in a magnetic field
Petr A. Mishchenko, Yasuyuki Kato, Yukitoshi Motome
The quantum Monte Carlo method on asymptotic Lefschetz thimbles is a numerical algorithm devised specifically for alleviation of the sign problem appearing in the simulations of qu…