期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 536, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jmmm.2021.168089
关键词
Honeycomb ferromagnet; Topological band structure; Discrete breathers; Solitons
资金
- National Natural Science Foundation of China [12064011, 11875126, 11964011]
- Natural Science Fund Project of Hunan Province [2020JJ4498, 2020JJ5453]
- Graduate Research Innovation Foundation of Jishou University [JGY202029]
This theoretical study investigates nonlinear localized excitations in a Heisenberg honeycomb ferromagnet with a second neighbour Dzialozinskii-Moriya interaction, exhibiting topological band structure. Various types of nonlinear localized excitations, including two-dimensional discrete breathers and bulk gap solitons, are found using the semidiscrete multiple-scale method.
We theoretically investigate nonlinear localized excitations in a Heisenberg honeycomb ferromagnet with a second neighbour Dzialozinskii-Moriya interaction, which has been proved to possess the topological band structure. Using the time-dependent variational principle, we obtain the equation of motion for the system in the Glauber coherent-state representation. By means of the semidiscrete multiple-scale method, different types of nonlinear localized excitations are gotten. Our results show that both two-dimensional discrete breathers and bulk gap solitons may occur in the Heisenberg honeycomb ferromagnet.
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