Abstract
An analytical study on the properties of intrinsic localized modes and modulational instability in a quantum two-dimensional ferromagnet with single-ion uniaxial anisotropy is completed in the semiclassical limit. By making use of the semidiscrete multiple-scale method, we obtain a line localized solution and a radially symmetric localized solution, and analyze their existence conditions. Taking into account that the existence of bright localized solutions is closely linked to the modulational instability of plane waves, we analytically study the discrete modulational instability of plane spin waves. The result of the modulational instability analysis show that the uniaxial anisotropy plays a key role in the appearance of our intrinsic localized spin wave modes.
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This work was supported by the National Natural Science Foundation of China under Grant No. 11604121, the Scientific Research Fund of Hunan Provincial Education Department under Grant No. 16B210, and the Natural Science Fund Project of Hunan Province under Grant No. 2017JJ3255.
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Wu, T., Xie, J., Chang, X. et al. Intrinsic Localized Spin Wave Modes and Modulational Instability in a Two-Dimensional Heisenberg Ferromagnet. Int J Theor Phys 56, 3005–3018 (2017). https://doi.org/10.1007/s10773-017-3467-7
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DOI: https://doi.org/10.1007/s10773-017-3467-7