Spin correlation functions and decay of quasiparticles in XXZ spin chain at T>0

Igor Poboiko, Mikhail Feigel'Man

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Abstract

We study a one-dimensional anisotropic XXZ spin-12 model with ferromagnetic sign of the coupling and z-z exchange constant Jz=ΔJ, where Δ<1, and J is the coupling within the XY spin plane. We calculate the damping of low-energy excitations with ωT due to their scattering from thermal excitation bath with temperature TJ, taking into account nonzero curvature of the excitation spectrum, ϵ(q)=uq+δϵ(q). We calculate also longitudinal spin-spin correlation function (Sz(x,t)Sz(0,0)) at x≈ut and find the shape of the spreading "wave packet".

Original languageEnglish
Article number195420
JournalPhysical Review B
Volume94
Issue number19
DOIs
Publication statusPublished - 2016
Externally publishedYes

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