Quantum quench within the gapless phase of the spin-1/2 Heisenberg XXZ spin-chain
arXiv:1507.03492 · doi:10.1103/PhysRevB.92.125131
Abstract
We consider an interaction quench in the critical spin-1/2 Heisenberg XXZ chain. We numerically compute the time evolution of the two-point correlation functions of spin operators in the thermodynamic limit and compare the results to predictions obtained in the framework of the Luttinger liquid approximation. We find that the transverse correlation function agrees with the Luttinger model prediction to a surprising level of accuracy. The agreement for the longitudinal two-point function is found to be much poorer. We speculate that this difference between transverse and longitudinal correlations has its origin in the locality properties of the respective spin operator with respect to the underlying fermionic modes.
27 pages, 13 figures
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