تقرير
Spin diffusion in perturbed isotropic Heisenberg spin chain
| العنوان: | Spin diffusion in perturbed isotropic Heisenberg spin chain |
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| المؤلفون: | Nandy, S., Lenarčič, Z., Ilievski, E., Mierzejewski, M., Herbrych, J., Prelovšek, P. |
| المصدر: | Phys. Rev. B 108, L081115 (2023) |
| سنة النشر: | 2022 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Statistical Mechanics |
| الوصف: | The isotropic Heisenberg chain represents a particular case of an integrable many-body system exhibiting superdiffusive spin transport at finite temperatures. Here, we show that this model has distinct properties also at finite magnetization $m\ne0$, even upon introducing the SU(2) invariant perturbations. Specifically, we observe nonmonotonic dependence of the diffusion constant ${\cal D}_0(\Delta)$ on the spin anisotropy $\Delta$, with a pronounced maximum at $\Delta =1$. The latter dependence remains true also in the zero magnetization sector, with superdiffusion at $\Delta=1$ that is remarkably stable against isotropic perturbation (at least in finite-size systems), consistent with recent experiments with cold atoms. Comment: 5+5 pages, 4+5 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevB.108.L081115 |
| URL الوصول: | http://arxiv.org/abs/2211.17181 |
| رقم الأكسشن: | edsarx.2211.17181 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevB.108.L081115 |
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