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28 March 2024
 
  » arxiv » cond-mat/9712241

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On solitary waves in classical anisotropic Heisenberg chains with generalized boundary conditions
John Schliemann ; Franz G. Mertens ;
Date 19 Dec 1997
Subject cond-mat
AbstractWe examine solitary waves in classical Heisenberg chains with an uniaxial anisotropy and a parallel magnetic field in a continuum approach. The boundary conditions commonly used are generalized to nonlinear spin wave states, which themselves turn out to be stable only for an anisotropy of the easy-plane type. In this case we obtain two different branches of one-soliton solutions which can be mapped onto each other by a formal time inversion. Moreover, they show some remarkable similarity to dark solitons of the Nonlinear Schrödinger equation. Numerical simulations for the discrete Heisenberg chain show that these solitary waves are highly, but not absolutely stable under interaction with linear excitations and as well under scattering with each other. The possible significance of these solitary waves in a phenomenological theory of one-dimensional magnets is briefly addressed.
Source arXiv, cond-mat/9712241
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