7 citations · 19 across the 6 of their papers we have counts for
7 papers
Optimal learning of covariant quantum states and channels
Satoshi Yoshida, Kazuki Okigami, Pietro M. Posta +1
We give collective tomography protocols for quantum states and channels with known symmetries, using random purification and dilation to reduce learning to pure-state estimation. F…
Multiple- spin textures induced by spiral--staggered interference in one-dimensional itinerant magnets
Satoru Hayami, Kazuki Okigami
We theoretically investigate multiple- magnetic states emerging from the interference between finite- spiral and staggered spin modulations in a one-dimensional itinerant ele…
Finite-temperature stability of skyrmion crystals in frustrated magnets: Role of sixfold anisotropy and uniform spin mode in momentum space
Kazuki Okigami, Satoru Hayami
We study the finite-temperature stability of skyrmion crystals in frustrated magnets by analyzing the momentum-space exchange interaction of a classical Heisenberg model on a trian…
Four-Spin Interactions as a Route to Multiple-Q Topological Magnetic Order
Kazuki Okigami, Satoru Hayami
We investigate the role of four-spin interactions in stabilizing exotic multiple- topological spin textures and demonstrate their ability to realize a skyrmion crystal. While su…
Exploring topological spin order by inverse Hamiltonian design: A new stabilization mechanism for square skyrmion crystals
Kazuki Okigami, Satoru Hayami
We propose a framework to construct a real-space spin model based on the inverse Hamiltonian design. The method provides an efficient way of realizing unconventional topological sp…
Incommensurate broken helix induced by nonstoichiometry in the axion insulator candidate EuInAs
Masaki Gen, Yukako Fujishiro, Kazuki Okigami +9
Zintl phase EuInAs has garnered growing attention as an axion insulator candidate, triggered by the identification of a commensurate double- broken-helix s…
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…