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  • Letter
  • Open Access

Signatures of the attractive interaction in spin spectra of one-dimensional cuprate chains

Zecheng Shen1,*, Jiarui Liu2,3,*, Hao-Xin Wang4, and Yao Wang1,2,†

  • *These authors contributed equally to this work.
  • †Contact author: yao.wang@emory.edu
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Phys. Rev. Research 6, L032068 – Published 18 September, 2024

DOI: https://doi.org/10.1103/PhysRevResearch.6.L032068

Abstract

Identifying the minimal model for cuprates is crucial for explaining the high-Tc 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,ω) 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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Influence of extended interactions on spin dynamics in one-dimensional cuprates

Ta Tang, Daniel Jost, Brian Moritz, and Thomas P. Devereaux
Phys. Rev. B 110, 165118 (2024)

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Phys. Rev. Research 6, L032068– Published 18 September, 2024
  • Received 19 May 2024
  • Accepted 2 August 2024
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