Prominent Dimensional Effects on High-order Harmonic Generation in Strongly Correlated Electron Systems
Year: 2026
Type: preprint
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 SrCuO$_2$ and quasi-two-dimensional Pr$_2$CuO$_4$ 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$_2$CuO$_4$ 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.
Source: arXiv (Cornell University)
Authors: Uchida, Kento, Takayoshi, Shintaro, Murakami, Yuta, Song, Dongjoon, Hallas, Alannah M., Watanabe, Masayuki, Konishi, Takashi, Nakano, Aiko, Tanaka, Koichiro
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: Characterization and understanding of mechanical properties using high-harmonics generation of infrared pulses, Establishment of strong light field photoscience in solids and application to materials science, G2885258565, Real and reciprocal spacetime imaging of many-body excitons and quantum phase control, Control of quantum states by geometric tunneling phenomena, 新たな非平衡第一原理計算による量子物質の非線形分光と機能開拓, High harmonic spectroscopy and ultrafast control of material using the polarization gating, Foundation of Nonclassical Nonlinear Photophysics: Exploring Quantum Correlations between Quantum Light and Solids, 次世代の非平衡Green関数法開発と秩序揺らぎの非平衡物理への展開, Exploration of quantum light induced nonequilibrium phenomena
OpenAlex ID: W7207836391