Finite Temperature Dynamical Structure Factor of the Heisenberg-Ising Chain

Details Finite Temperature Dynamical Structure Factor of the Heisenberg-Ising Chain Finite Temperature Dynamical Structure Factor of the Heisenberg-Ising Chain

2009-02-13

arxiv.org/abs/0902.2402v2

Phys. Rev. B 79, 214408 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

23 pages, 19 eps figures (now improved), uses feynmf

Scientific paper

10.1103/PhysRevB.79.214408

We consider the spin-1/2 Heisenberg XXZ chain in the regime of large Ising-like anisotropy $\Delta$. By a combination of duality and Jordan-Wigner transformations we derive a mapping to weakly interacting spinless fermions, which represent domain walls between the two degenerate ground states. We develop a perturbative expansion in $1\Delta$ for the transverse dynamical spin structure factor at finite temperatures and in an applied transverse magnetic field. We present a unified description for both the low-energy temperature-activated response and the temperature evolution of the T=0 two-spinon continuum. We find that the two-spinon continuum narrows in energy with increasing temperature. At the same time spectral weight is transferred from the two-spinon continuum to the low energy intraband scattering continuum, which is strongly peaked around the position of the (single) spinon dispersion (`Villain mode').

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