Four types of atomic-scale multipoles (electric, magnetic, magnetic toroidal, and electric
toroidal multipoles) give a complete set to describe arbitrary degrees of freedom for coupled …

Mutual interplay between the electronic degrees of freedom in solids, such as charge, spin,
orbital, sublattice, and bond degrees of freedom, is a source of cross-correlated phenomena …

We theoretically investigate a nonlinear spin Hall effect in PT-symmetric antiferromagnetic
metals, which serve as an efficient spin current generator. We elucidate that an emergent …

The Kitaev spin liquid provides a rare example of well-established quantum spin liquids in
more than one dimension. It is obtained as the exact ground state of the Kitaev spin model …

We theoretically investigate an intrinsic nonlinear anomalous Hall effect (INAHE) in space-
time (PT) symmetric antiferromagnetic metals. The INAHE is characterized by an asymmetric …

The generalization of the atomic-scale multipoles is discussed. By introducing the
augmented multipoles defined in the hybrid orbitals or in the site/bond-cluster, any of …

We propose a realization of an antisymmetric spin-split band structure through magnetic
phase transitions without spin-orbit coupling. It enables us to utilize it for a variety of …

We propose a systematic analysis method for identifying essential parameters in various
linear and nonlinear response tensors without which they vanish. By using the Keldysh …

The nature of an electric ferroaxial moment characterizing a time-reversal-even axial-vector
quantity is theoretically investigated under magnetic orderings. We clarify that a vortex spin …

We report our theoretical results on the order parameters for the pyrochlore metal Cd 2 Re 2
O 7, which undergoes enigmatic phase transitions with inversion symmetry breaking. By …