158 citations · 730 across the 12 of their papers we have counts for
12 papers
Symmetry analysis with spin crystallographic groups: Disentangling effects free of spin-orbit coupling in emergent electromagnetism
Hikaru Watanabe, Kohei Shinohara, Takuya Nomoto +2
Recent studies identified spin-order-driven phenomena such as spin-charge interconversion without relying on the relativistic spin-orbit interaction. Those physical properties can…
Emergent Magneto-multipoles and Nonlinear Responses of a Magnetic Hopfion
Yizhou Liu, Hikaru Watanabe, Naoto Nagaosa
The three-dimensional emergent magnetic field of a magnetic hopfion gives rise to emergent magneto-multipoles in a similar manner to the multipoles of classical elec…
Nonreciprocal Meissner response in parity-mixed superconductors
Hikaru Watanabe, Akito Daido, Youichi Yanase
The parity breaking gives rise to rich superconducting properties through the admixture of even and odd-parity Cooper pairs. A new light has been shed on parity-breaking supercondu…
Nonreciprocal optical response in parity-breaking superconductors
Hikaru Watanabe, Akito Daido, Youichi Yanase
Superconductivity, an emergence of a macroscopic quantum state, gives rise to unique electromagnetic responses leading to perfect shielding of magnetic field and zero electrical re…
Superconducting piezoelectric effect
Michiya Chazono, Hikaru Watanabe, Youichi Yanase
The magnetopiezoelectric effect (MPE) is a cross-coupling between an electric current and strain in metals with neither inversion symmetry nor time-reversal symmetry. Unlike the co…
Photocurrent response in parity-time symmetric current-ordered states
Hikaru Watanabe, Youichi Yanase
There is growing interest in the photo-induced generation of rectified current, namely photocurrent phenomenon. While the response was attributed to noncentrosymmetric structures o…
Nonlinear electric transport in odd-parity magnetic multipole systems: Application to Mn-based compounds
Hikaru Watanabe, Youichi Yanase
Violation of parity symmetry gives rise to various physical phenomena such as nonlinear transport and cross-correlated responses. In particular, the nonlinear conductivity has been…
Chiral photocurrent in parity-violating magnet and enhanced response in topological antiferromagnet
Hikaru Watanabe, Youichi Yanase
Rectified electric current induced by irradiating light, so-called photocurrent, is an established phenomenon in optoelectronic physics. In this paper, we present a comprehensive c…
Symmetry analysis of current-induced switching of antiferromagnets
Hikaru Watanabe, Youichi Yanase
Antiferromagnets are robust to external electric and magnetic fields, and hence are seemingly uncontrollable. Recent studies, however, realized the electrical manipulations of anti…
Group-theoretical classification of multipole order: emergent responses and candidate materials
Hikaru Watanabe, Youichi Yanase
The multipole moment is an established concept of electrons in solids. Entanglement of spin, orbital, and sublattice degrees of freedom is described by the multipole moment, and sp…
Theory of orbital magnetic quadrupole moment and magnetoelectric susceptibility
Atsuo Shitade, Hikaru Watanabe, Youichi Yanase
We derive a quantum-mechanical formula of the orbital magnetic quadrupole moment (MQM) in periodic systems by using the gauge-covariant gradient expansion. This formula is valid fo…
Magnetic hexadecapole order and magnetopiezoelectric metal in BaKMnAs
Hikaru Watanabe, Youichi Yanase
We study an odd-parity magnetic multipole order in BaKMnAs and related materials. Although BaMnAs is a seemingly conventional Mott insulator with G-type…