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arXiv · 2512.08421

Decay of spin helices in XXZ quantum spin chains with single-ion anisotropy

Florian Lange·Frank Göhmann·Gerhard Wellein·Holger Fehske
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Abstract

Long-lived spin-helix states facilitate the study of non-equilibrium dynamics in quantum magnets. We consider the decay of transverse spin-helices in antiferromagnetic spin-$S$ XXZ chains with single-ion anisostropy. The spin-helix decay is observable in the time evolution of the local magnetization that we calculate numerically for the system in the thermodynamic limit using infinite time-evolving block decimation simulations. Although the single-ion anisotropy prevents helix states from being eigenstates of the Hamiltonian, they still can be long-lived for appropriately chosen wave numbers. In case of an easy-axis exchange anisotropy the single-ion anisotropy may even stabilize the helices. Within a spin-wave approximation, we obtain a condition giving an estimate for the most stable wave number $Q$ that agrees qualitatively with our numerical results.

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Florian Lange, Frank Göhmann, Gerhard Wellein, Holger Fehske. 2025-12-09. Decay of spin helices in XXZ quantum spin chains with single-ion anisotropy. https://arxiv.org/abs/2512.08421

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