Hinge magnons from noncollinear magnetic order in a honeycomb antiferromagnet
- Authors
- Park, Moon Jip; Lee, Sungbin; Kim, Yong Baek
- Issue Date
- Aug-2021
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW B, v.104, no.6
- Indexed
- SCIE
SCOPUS
- Journal Title
- PHYSICAL REVIEW B
- Volume
- 104
- Number
- 6
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/189280
- DOI
- 10.1103/PhysRevB.104.L060401
- ISSN
- 2469-9950
- Abstract
- We propose that noncollinear magnetic order in magnetic systems can harbor a higher-order topological magnon phase with non-Hermitian topology and hinge magnon modes. We consider a three-dimensional system of interacting local moments on stacked layers of honeycomb lattice. It initially favors a collinear magnetic order along an in-plane direction, which turns into a noncollinear order upon applying an external magnetic field perpendicular to the easy axis. We exploit the non-Hermitian nature of the magnon Hamiltonian to show that this field-induced transition corresponds to the transformation from a topological magnon insulator to a higher-order topological magnon state with a one-dimensional hinge mode. As a concrete example, we discuss the recently discovered monoclinic phase of thin chromium trihalides, which we propose as a promising material candidate of the higher-order topological magnon phase.
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