paper

Dynamical spin excitations of topological Haldane gapped phase in the Heisenberg antiferromagnetic chain with single-ion anisotropy

arXiv:2003.07857 · doi:10.1103/PhysRevB.103.024403

Abstract

We study the dynamical spin excitations of the one-dimensional Heisenberg antiferromagnetic chain with single-ion anisotropy by using quantum Monte Carlo simulations and stochastic analytic continuation of imaginary-time correlation function. Using the transverse dynamic spin structure factor, we observe the quantum phase transition with a critical point between the topological Haldane gapped phase and the trivial phase. At the quantum critical point, we find a broad continuum characterized by the Tomonaga-Luttinger liquid similar to a Heisenberg antiferromagnetic chain. We further identify that the elementary excitations are fractionalized spinons.

7 pages, 8 figures

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