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Title: Asymmetric magnon excitation by spontaneous toroidal ordering

Abstract

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.

Authors:
 [1];  [2];  [3]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Tokyo, Tokyo (Japan)
  2. Meiji Univ., Kawasaki (Japan)
  3. Univ. of Tokyo, Tokyo (Japan)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1329892
Report Number(s):
LA-UR-15-26179
Journal ID: ISSN 0031-9015
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Journal of the Physical Society of Japan
Additional Journal Information:
Journal Volume: 85; Journal Issue: 5; Journal ID: ISSN 0031-9015
Publisher:
Physical Society of Japan
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; material science

Citation Formats

Hayami, Satoru, Kusunose, Hiroaki, and Motome, Yukitoshi. Asymmetric magnon excitation by spontaneous toroidal ordering. United States: N. p., 2016. Web. doi:10.7566/JPSJ.85.053705.
Hayami, Satoru, Kusunose, Hiroaki, & Motome, Yukitoshi. Asymmetric magnon excitation by spontaneous toroidal ordering. United States. https://doi.org/10.7566/JPSJ.85.053705
Hayami, Satoru, Kusunose, Hiroaki, and Motome, Yukitoshi. Tue . "Asymmetric magnon excitation by spontaneous toroidal ordering". United States. https://doi.org/10.7566/JPSJ.85.053705. https://www.osti.gov/servlets/purl/1329892.
@article{osti_1329892,
title = {Asymmetric magnon excitation by spontaneous toroidal ordering},
author = {Hayami, Satoru and Kusunose, Hiroaki and Motome, Yukitoshi},
abstractNote = {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.},
doi = {10.7566/JPSJ.85.053705},
journal = {Journal of the Physical Society of Japan},
number = 5,
volume = 85,
place = {United States},
year = {Tue Apr 12 00:00:00 EDT 2016},
month = {Tue Apr 12 00:00:00 EDT 2016}
}

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