PreprintCC BY 4.0arXiv
Finite-temperature spin diffusion in the two-dimensional XY model
Abstract
We present a combined theory-experiment study to quantify spin diffusion in the square lattice quantum spin-1/2 XY model at finite temperature. On the theory side, we leverage a recently developed dynamical high-temperature expansion method to faithfully capture the long spatiotemporal scales of the hydrodynamic regime. Experimental results are obtained from an optical lattice hard-core boson quantum simulator. The excellent agreement of spin diffusion constants marks a breakthrough in spin-transport beyond one dimension and for the quantitative validation of state-of-the-art quantum simulation platforms. We also provide theory predictions for future experiments on dynamic spin conductivity or anisotropy-induced integrability breaking.
Versions
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BibTeX
@misc{fitzner2026finitetemperature,
title = {{Finite-temperature spin diffusion in the two-dimensional XY model}},
author = {Erik Fitzner and Byungjin Lee and Junhyeok Hur and Minseok Kim and Benedikt Schneider and Jae-yoon Choi and Björn Sbierski},
howpublished = {arXiv},
year = {2026},
month = aug,
doi = {10.48550/arxiv.2605.20124},
eprint = {2605.20124},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2605.20124},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Finite-temperature spin diffusion in the two-dimensional XY model
AU - Erik Fitzner
AU - Byungjin Lee
AU - Junhyeok Hur
AU - Minseok Kim
AU - Benedikt Schneider
AU - Jae-yoon Choi
AU - Björn Sbierski
PY - 2026
DA - 2026/08/28
PB - arXiv
DO - 10.48550/arxiv.2605.20124
UR - https://arxiv.org/abs/2605.20124
AB - We present a combined theory-experiment study to quantify spin diffusion in the square lattice quantum spin-1/2 XY model at finite temperature. On the theory side, we leverage a recently developed dynamical high-temperature expansion method to faithfully capture the long spatiotemporal scales of the hydrodynamic regime. Experimental results are obtained from an optical lattice hard-core boson quantum simulator. The excellent agreement of spin diffusion constants marks a breakthrough in spin-transport beyond one dimension and for the quantitative validation of state-of-the-art quantum simulation platforms. We also provide theory predictions for future experiments on dynamic spin conductivity or anisotropy-induced integrability breaking.
ER -