Abstract
A XY Heisenberg spin chain model with two perpendicular spins par site is mapped onto a Kirchhoff thin elastic rod. It is shown that in the case of constant curvature the Euler—Lagrange equation leads to the static sine-Gordon equation. The case of a double-helical DNA-like configuration corresponds to two interacting Heisenberg spin chains and the corresponding Euler—Lagrange equation gives a system of coupled static sine-Gordon-type equations. The kink-antikink type and periodical static solutions for these models are derived. The soliton dynamics and the the nonlinear excitations of the systems are investigated. The interplay between curvature and nonlinear excitations is analyzed as well.
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Grahovski, G.G., Dandoloff, R. (2007). A XY Spin Chain Models on Space Curves and Analogy with Kirchhoff Rods. In: Taş, K., Tenreiro Machado, J.A., Baleanu, D. (eds) Mathematical Methods in Engineering. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-5678-9_34
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DOI: https://doi.org/10.1007/978-1-4020-5678-9_34
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