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

Lange F, Göhmann F, Wellein G, Fehske H (2026)

Publication Type: Journal article, Original article

Publication year: 2026

Journal

Physical Review B American Physical Society

Original Authors: Florian Lange, Frank Göhmann, Gerhard Wellein, Holger Fehske

Book Volume: 113

Pages Range: 245401

Article Number: 245401

Issue: 24

DOI: 10.1103/mqvf-wq91

Abstract

Long-lived spin-helix states facilitate the study of nonequilibrium 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 the case of 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.

Authors with CRIS profile

Florian Lange Erlangen National High Performance Computing Center (NHR@FAU) Gerhard Wellein Professur für Höchstleistungsrechnen Holger Fehske Erlangen National High Performance Computing Center (NHR@FAU)

Involved external institutions

Bergische Universität Wuppertal

Germany (DE)

How to cite

APA:

Lange, F., Göhmann, F., Wellein, G., & Fehske, H. (2026). Decay of spin helices in XXZ quantum spin chains with single-ion anisotropy. Physical Review B, 113, 245401. https://doi.org/10.1103/mqvf-wq91

MLA:

Lange, Florian, et al. "Decay of spin helices in XXZ quantum spin chains with single-ion anisotropy." Physical Review B 113 (2026): 245401.

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