10 papers
Electric toroidal octupolar symmetry in pyrite FeS probed by Raman optical activity
Yuki Suganuma, Gakuto Kusuno, Hikaru Watanabe +4
We report Raman optical activity in pyrite FeS, which hosts an electric toroidal octupolar symmetry. A clear and reproducible sign reversal of the circular intensity difference…
Ferroaxial magnets: time-reversal-even mirror symmetry violation from spin order
Hikaru Watanabe, Yue Yu, Jin Matsuda +2
We investigate ferroaxial magnets, a new class of spin-order-driven multiferroic magnets in which magnetic ordering induces mirror-symmetry breaking while preserving both time-reve…
Parity and time-reversal invariant Ising spin ordering
Yue Yu, Jin Matsuda, Hikaru Watanabe +2
The interplay of antiferromagnetic order, momentum-dependent Bloch spin-splitting, time-reversal (T), and parity (P) symmetries in non-relativistic systems has emerged as a central…
Systematic Magnetic Structure Generation Based on Oriented Spin Space Groups: Formulation, Applications, and High-Throughput First-Principles Calculations
Takuya Nomoto, Kohei Shinohara, Hikaru Watanabe +1
We propose a framework for generating magnetic structures, inspired by the concept of oriented spin space groups (SSGs): magnetic structures are first generated as totally symmetri…
Dirac charge in antiferromagnetic topological semimetals
Kohei Hattori, Hikaru Watanabe, Ryotaro Arita
Topological node of electronic bands can carry emergent charge degree of freedom such as the Berry curvature monopole of the Weyl semimetals, which results in intriguing transport…
Dual-circular Raman optical activity of axial multipolar order
Hikaru Watanabe, Rikuto Oiwa, Hitoshi Mori +1
Multipolar order, such as octupolar order, is a key concept in condensed matter physics, particularly in light of elusive hidden orders. However, its experimental identification re…