4 research outputs found
Power-law spin correlations in a perturbed honeycomb spin model
We consider spin- model on the honeycomb lattice~\cite{Kitaev06}
in presence of a weak magnetic field . Such a perturbation
destroys exact integrability of the model in terms of gapless fermions and
\textit{static} fluxes. We show that it results in appearance of a
long-range tail in the irreducible dynamic spin correlation function: , where is
proportional to the density polarization function of fermions