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Topological semimetal-to-insulator phase transition between noncollinear and noncoplanar multiple-Q states on a square-to-triangular lattice
Satoru Hayami, Yukitoshi Motome
Noncollinear and noncoplanar magnetic orders lead to unusual electronic structures and transport properties. We here investigate two types of multiple-Q magnetically ordered states…
Toroidal order in a partially disordered state on a layered triangular lattice: implication to UNi4B
Satoru Hayami, Hiroaki Kusunose, Yukitoshi Motome
A partial disorder on a layered triangular lattice is theoretically investigated from a viewpoint of toroidal ordering and magnetoelectric effects. We consider an extended periodic…
Quantum spin Hall effect in a two-orbital model on a honeycomb lattice
Satoru Hayami, Hiroaki Kusunose, Yukitoshi Motome
The spin Hall effect is investigated in a two-orbital tight-binding model on a honeycomb lattice. We show that the model exhibits three topologically-different insulating phases at…
Multiple-Q Instability by (d-2)-dimensional Connections of Fermi Surfaces
Satoru Hayami, Yukitoshi Motome
We propose a general mechanism of multiple-Q ordering with noncollinear and noncoplanar spin textures in itinerant magnets. By analyzing the fourth-order perturbation with respect…
Spontaneous Parity Breaking in Spin-Orbital Coupled Systems
Satoru Hayami, Hiroaki Kusunose, Yukitoshi Motome
Effects of spontaneous parity breaking by charge, spin, and orbital orders are investigated in a two-band Hubbard model on a honeycomb lattice. This is a minimal model in which the…
Toroidal order in metals without local inversion symmetry
Satoru Hayami, Hiroaki Kusunose, Yukitoshi Motome
Toroidal order, given by a composite of electric and magnetic orders, manifests itself not only in the peculiar magnetism but also in anomalous transport and magnetoelectric effect…