In the topological regime of a parametrically modulated spin-1/2 chain, time-averaged magnetization shows no frequency dispersion and spatial correlations are absent or suppressed near resonance, with the topological-to-trivial transition set by modulation frequency.
Villain, Quantum-theory of 1- and 2-dimensional ferromagnets and antiferromagnets W an easy magnetization plane
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Anomalous parametric resonance in a spin-1/2 chain: dynamical effects of nontrivial topology
In the topological regime of a parametrically modulated spin-1/2 chain, time-averaged magnetization shows no frequency dispersion and spatial correlations are absent or suppressed near resonance, with the topological-to-trivial transition set by modulation frequency.