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Electron correlations play a dominant role in the charge dynamics of thecuprates. We use resonant inelastic x-ray scattering (RIXS) to track the dopingdependence of the collective charge excitations in electron dopedLa$_{2-x}$Ce$_{x}$CuO$_{4}$(LCCO). From the resonant energy dependence and theout-of-plane momentum dependence, the charge excitations are identified asthree-dimensional (3D) plasmons, which reflect the nature of the electronicstructure and Coulomb repulsion on both short and long length scales. Withincreasing electron doping, the plasmon excitations show monotonic hardening inenergy, a consequence of the electron correlation effect on electron structurenear the Fermi surface (FS). Importantly, the plasmon excitations evolve from abroad feature into a well defined peak with much increased life time, revealingthe evolution of the electrons from incoherent states to coherentquasi-particles near the FS. Such evolution marks the reduction of theshort-range electronic correlation, and thus the softening of the Mottness ofthe system with increasing electron doping.

Doping evolution of the charge excitations and electron correlations in electron-doped superconducting La$_{2-x}$Ce$_{x}$CuO$_{4}$