Solitons and intrinsic localized modes in a one-dimensional antiferromagnetic chain |
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| Authors: | Li De-Jun Mi Xian-Wu Deng Ke and Tang Yi |
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| Affiliation: | Department of Physics, Jishou University, Jishou 416000, China; Department of Physics, Xiangtan University, Xiangtan 411105, China |
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| Abstract: | By use of the Hartree approximation and the method of multiple scales, we
investigate quantum solitons and intrinsic localized modes in a
one-dimensional antiferromagnetic chain. It is shown that there exist
solitons of two different quantum frequency bands: i.e., magnetic optical
solitons and acoustic solitons. At the boundary of the Brillouin zone, these
solitons become quantum intrinsic localized modes: their quantum
eigenfrequencies are below the bottom of the harmonic optical frequency band
and above the top of the harmonic acoustic frequency band. |
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| Keywords: | antiferromagnetic chain Hartree approximation quantum soliton quantum intrinsic localized mode |
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