Low-temperature dynamics of the classical antiferromagnetic Heisenberg chain in an external field

1 May 1981

journal article
research article
Published by American Physical Society (APS) in Physical Review B

Vol. 23 (9) , 4597-4607
https://doi.org/10.1103/physrevb.23.4597

Abstract

The influence of the nonlinearity of the spin equations of motion on the dynamic structure factor of the antiferromagnetic Heisenberg chain in an external field is calculated in the low-temperature limit. The memory functions for the longitudinal and transverse spin component are calculated rigorously to lowest nonvanishing order in the temperature. In this limit, only two-magnon processes contribute to the memory functions. Divergencies in the two-magnon density of states give rise to resonances in addition to the usual spin-wave peak in the dynamic structure factor.

Keywords

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