Close inspection of plasmon excitations in cuprate superconductors
Abstract
Recently resonant inelastic x-ray scattering experiments reported fine details of the charge excitations around the in-plane momentum q=(0,0) for various doping rates in electron-doped cuprates La2-xCexCuO4. We find that those new experimental data are well captured by acoustic-like plasmon excitations in a microscopic study of the layered t-J model with the long-range Coulomb interaction. The acoustic-like plasmon is not a usual plasmon typical to the two-dimensional system, but has a small gap proportional to the interlayer hopping tz.
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