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Layered two-dimensional electron systems exhibit both optical and acousticlike plasmons around the Brillouin-zone center. In the layered cuprate La_{2-x}Sr_xCuO4, resonant inelastic x-ray scattering (RIXS) has detected corresponding acousticlike plasmons in a low-energy regime comparable to that of other collective excitations associated with distinct regions of the cuprate phase diagram. This overlap in energy scale raises the question of whether the acousticlike plasmons are significantly influenced by phase-specific electronic phenomena, including the pseudogap, charge and spin order, superconductivity, and strange-metal behavior. Here we show that a single parameter set of the layered t-J-V model, which incorporates strong correlations and the long-range Coulomb interaction V, consistently describes the acousticlike plasmon dispersion across all currently available RIXS data from the underdoped to the heavily overdoped regime. This transferability of a single parameter set exceeds that of earlier theoretical descriptions and supports a picture in which strong correlations persist into the heavily overdoped regime, while the collective plasmon mode exhibits only limited sensitivity to the phase-specific electronic phenomena that distinguish different regions of the phase diagram.

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• In Copyright
  

  ©2026 American Physical Society

Keyword: plasmon, acousticlike plasmon, t-J model, cuprate superconductors

Date published: 2026-07-08

Publisher: American Physical Society (APS)

Journal:

• Physical Review B (ISSN: 1550235X) vol. 114 issue. 5 L051103

Funding:

• Ministry of Education, Culture, Sports, Science and Technology

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.6512

First published URL: https://doi.org/10.1103/k1m6-dbpk

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Updated at: 2026-09-11 09:42:10 +0900

Published on MDR: 2026-09-11 14:26:05 +0900