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

• URL: http://arxiv.org/abs/2512.08421v1
• Date: Tue, 09 Dec 2025 09:46:45 GMT
• Title: Decay of spin helices in XXZ quantum spin chains with single-ion anisotropy
• Authors: Florian Lange, Frank Göhmann, Gerhard Wellein, Holger Fehske,
• Abstract summary: Long-lived spin-helix states facilitate the study of non-equilibrium dynamics in quantum magnets.<n>We consider the decay of transverse spin-helices in antiferromagnetic spin-$S$ XXZ chains with single-ion anisostropy.
• Score: 0.9799637101641152
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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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