Prominent Dimensional Effects on High-order Harmonic Generation in Strongly Correlated Electron Systems
Abstract
Dimensionality strongly affects elementary excitations in correlated quantum materials, yet its impact on extreme nonlinear optical responses remains largely unexplored. Here, we combine high-harmonic generation (HHG) experiments on quasi-one-dimensional SrCuO2 and quasi-two-dimensional Pr2CuO4 with nonequilibrium simulations of Hubbard models. We find a pronounced dimensional contrast: SrCuO2 exhibits a robust plateau-like high-harmonic spectrum with weak temperature dependence, whereas Pr2CuO4 shows a monotonic decrease in harmonic yield and strong thermal suppression, especially at higher harmonics. The simulations qualitatively reproduce these trends and identify dimensionality-dependent doublon--holon dephasing, governed by spin--charge coupling, as their microscopic origin. These results establish dimensionality and spin--charge coupling as key control parameters for extreme nonlinear optical responses in correlated insulators.
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BibTeX
@misc{uchida2026prominent,
title = {{Prominent Dimensional Effects on High-order Harmonic Generation in Strongly Correlated Electron Systems}},
author = {Kento Uchida and Shintaro Takayoshi and Yuta Murakami and Dongjoon Song and Alannah M. Hallas and Masayuki Watanabe and Takashi Konishi and Aiko Nakano and Koichiro Tanaka},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.02466},
eprint = {2609.02466},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.02466},
}
RIS
TY - UNPB
TI - Prominent Dimensional Effects on High-order Harmonic Generation in Strongly Correlated Electron Systems
AU - Kento Uchida
AU - Shintaro Takayoshi
AU - Yuta Murakami
AU - Dongjoon Song
AU - Alannah M. Hallas
AU - Masayuki Watanabe
AU - Takashi Konishi
AU - Aiko Nakano
AU - Koichiro Tanaka
PY - 2026
DA - 2026/09/02
PB - arXiv
DO - 10.48550/arxiv.2609.02466
UR - https://arxiv.org/abs/2609.02466
AB - Dimensionality strongly affects elementary excitations in correlated quantum materials, yet its impact on extreme nonlinear optical responses remains largely unexplored. Here, we combine high-harmonic generation (HHG) experiments on quasi-one-dimensional SrCuO_2 and quasi-two-dimensional Pr_2CuO_4 with nonequilibrium simulations of Hubbard models. We find a pronounced dimensional contrast: SrCuO_2 exhibits a robust plateau-like high-harmonic spectrum with weak temperature dependence, whereas Pr_2CuO_4 shows a monotonic decrease in harmonic yield and strong thermal suppression, especially at higher harmonics. The simulations qualitatively reproduce these trends and identify dimensionality-dependent doublon--holon dephasing, governed by spin--charge coupling, as their microscopic origin. These results establish dimensionality and spin--charge coupling as key control parameters for extreme nonlinear optical responses in correlated insulators.
ER -