Quantum quenches in the thermodynamic limit. II. Initial ground states

摘要

A numerical linked-cluster algorithm was recently introduced to study quantumquenches in the thermodynamic limit starting from thermal initial states [M.Rigol, Phys. Rev. Lett. 112, 170601 (2014)]. Here, we tailor that algorithm toquenches starting from ground states. In particular, we study quenches from theground state of the antiferromagnetic Ising model to the XXZ chain. Our resultsfor spin correlations are shown to be in excellent agreement with recentanalytical calculations based on the quench action method. We also show thatthey are different from the correlations in thermal equilibrium, which confirmsthe expectation that thermalization does not occur in general in integrablemodels even if they cannot be mapped to noninteracting ones.