Asymmetric magnon excitation by spontaneous toroidal ordering
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Tokyo, Tokyo (Japan)
- Meiji Univ., Kawasaki (Japan)
- Univ. of Tokyo, Tokyo (Japan)
The effects of spontaneous toroidal ordering on magnetic excitation are theoretically investigated for a localized spin model that includes a staggered Dzyaloshinsky–Moriya interaction and anisotropic exchange interactions, which arise from the antisymmetric spin–orbit coupling and the multiorbital correlation effect. We show that the model exhibits a Néel-type antiferromagnetic order, which simultaneously accompanies a ferroic toroidal order. We find that the occurrence of toroidal order modulates the magnon dispersion in an asymmetric way with respect to the wave number: a toroidal dipole order on the zigzag chain leads to a band-bottom shift, while a toroidal octupole order on the honeycomb lattice gives rise to a valley splitting. These asymmetric magnon excitations could be a source of unusual magnetic responses, such as nonreciprocal magnon transport. A variety of modulations are discussed while changing the lattice and magnetic symmetries. Furthermore, the implications regarding candidate materials for asymmetric magnon excitations are presented.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE Laboratory Directed Research and Development (LDRD) Program
- Grant/Contract Number:
- AC52-06NA25396
- OSTI ID:
- 1329892
- Report Number(s):
- LA-UR-15-26179
- Journal Information:
- Journal of the Physical Society of Japan, Vol. 85, Issue 5; ISSN 0031-9015
- Publisher:
- Physical Society of JapanCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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