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(abstract)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.
権利情報:
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In Copyright
©2026 American Physical Society
キーワード: plasmon, acousticlike plasmon, t-J model, cuprate superconductors
刊行年月日: 2026-07-08
出版者: American Physical Society (APS)
掲載誌:
- Physical Review B (ISSN: 1550235X) vol. 114 issue. 5 L051103
研究助成金:
- Ministry of Education, Culture, Sports, Science and Technology
原稿種別: 著者最終稿 (Accepted manuscript)
MDR DOI: https://doi.org/10.48505/nims.6512
公開URL: https://doi.org/10.1103/k1m6-dbpk
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更新時刻: 2026-09-11 09:42:10 +0900
MDRでの公開時刻: 2026-09-11 14:26:05 +0900