Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 85, Issue 5, Pages -Publisher
PHYSICAL SOC JAPAN
DOI: 10.7566/JPSJ.85.053705
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Funding
- U.S. DOE through LDRD program [DE-AC52-06NA25396]
- Strategic Programs for Innovative Research (SPIRE), MEXT [24340076, 15K05176, 15H05885]
- Computational Materials Science Initiative (CMSI), Japan
- Grants-in-Aid for Scientific Research [15K05176, 15H05885] Funding Source: KAKEN
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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 Neel-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. The implications regarding candidate materials for asymmetric magnon excitations are presented.
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