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arXiv · 2405.11472

Signatures of the Attractive Interaction in Spin Spectra of One-dimensional Cuprate Chains

Zecheng Shen·Jiarui Liu·Hao-Xin Wang·Yao Wang
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Abstract

Identifying the minimal model for cuprates is crucial for explaining the high-$T_c$ pairing mechanism. Recent photoemission experiments have suggested a significant near-neighbor attractive interaction $V$ in cuprate chains, favoring pairing instability. To determine its strength, we systematically investigate the dynamical spin structure factors $S(q,\omega)$ using the density matrix renormalization group. Our analysis quantitatively reveals a notable softening in the two-spinon continuum, particularly evident in the intense spectrum at large momentum. This softening is primarily driven by the renormalization of the superexchange interaction, as determined by a comparison with the slave-boson theory. We also demonstrate the feasibility of detecting this spectral shift in thin-film samples using resonant inelastic x-ray scattering. Therefore, this provides a distinctive fingerprint for the attractive interaction, motivating future experiments to unveil essential ingredients in cuprates.

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Zecheng Shen, Jiarui Liu, Hao-Xin Wang, Yao Wang. 2024-05-19. Signatures of the Attractive Interaction in Spin Spectra of One-dimensional Cuprate Chains. https://doi.org/10.1103/physrevresearch.6.l032068

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