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Estimating many-body effects that deviate from an independent particle approach has long been a key research interest in condensed matter physics. Layered cuprates are prototypical systems, where electron-electron interactions are found to strongly affect the dynamics of single-particle excitations. It is, however, still unclear how the electron correlations influence charge excitations, such as plasmons, which have been variously treated with either weak or strong correlation models. In this work, we demonstrate the hybridized nature of collective valence charge fluctuations leading to dispersing acoustic-like plasmons in hole-doped La1.84Sr0.16CuO4 and electron-doped La1.84Ce0.16CuO4 using the two-particle probe, resonant inelastic x-ray scattering. We then describe the plasmon dispersions in both systems, within both the weak-coupling mean-field random phase approximation (RPA) and strong-coupling t-J-V model in a large-N scheme. The t-J-V model, which includes the correlation effects implicitly, accurately describes the plasmon dispersions as resonant excitations outside the single-particle intraband continuum. In comparison, a quantitative description of the plasmon dispersion in the RPA approach is obtained only upon explicit consideration of renormalized electronic band parameters. Our comparative analysis shows that electron correlations significantly impact the low-energy plasmon excita- tions across the cuprate doping phase diagram, even at long wavelengths. Thus, complementary information on the evolution of electron correlations, influenced by the rich electronic phases in condensed matter systems, can be extracted through the study of two-particle charge response.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: plasmon , resonant inelastic x-ray scattering , RIXS, superconductor , cuprare, electron correlations

Date published: 2024-11-21

Publisher: American Physical Society (APS)

Journal:

• Physical Review Research (ISSN: 26431564) vol. 6 issue. 4 043184

Funding:

• Diamond Light Source MM27872
• National Research Foundation of Korea
• Ministry of Science and ICT, South Korea RS-2023-00252768
• H2020 Marie Skłodowska-Curie Actions 884104
• Japan Society for the Promotion of Science JP20H01856
• Ministry of Education, Culture, Sports, Science and Technology
• National Natural Science Foundation of China 12225412
• Chinese Academy of Sciences 2022YSBR-048

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1103/physrevresearch.6.043184

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Updated at: 2024-12-05 12:46:38 +0900

Published on MDR: 2024-12-05 12:47:13 +0900