Quasiconserved quantities in the perturbed spin-21 XXX model

We consider the isotropic spin-21 Heisenberg spin chain weakly perturbed by a local translationally and SU(2)-invariant perturbation. Starting from the local integrals of motion of the unperturbed model, we modify them in order to obtain quasiconserved integrals of motion (charges) for the perturbed model. Such quasiconserved quantities are believed to be responsible for the existence of the prethermalization phase at intermediate timescales. We find that for a sufficiently local perturbation the quasiconserved quantities indeed exist, and we construct an explicit form for the first few of them.

Automated summary

In this study, we investigate a weakly perturbed isotropic spin-21 Heisenberg spin chain with a local translationally and SU(2)-invariant perturbation. By modifying the local integrals of motion of the unperturbed model, we obtain quasiconserved integrals of motion (charges) for the perturbed model, which are believed to be responsible for the prethermalization phase at intermediate timescales. We find that for a sufficiently local perturbation, the quasiconserved quantities indeed exist and we obtain an explicit form for the first few of them.