The asymmetry between electron and hole doping in high critical-temperature superconducting (HTS) cuprates
is key information for the understanding of Cooper pair formation mechanisms. Despite intensive studies on
different cuprates, a comprehensive description of related magnetic and charge excitations is still fragmentary.
In the present work, artificial cuprates were used to cover the entire phase diagram within the same HTS family.
In particular, Cu L3-edge resonant inelastic x-ray scattering (RIXS) measurements were performed on artificial
n- and p-type infinite layer (IL) epitaxial films. Beside several similarities, RIXS spectra show noticeable
differences in the evolution, with doping level, of magnetic and charge intensity and damping. Compatible trends
can be found in spectra measured on bulk cuprates, as well as in theoretical calculations of the spin dynamical
structure factor S(q,ω). The findings give a deeper insight into the evolution of collective excitations across the
cuprate phase diagram, and on underlying general features, only connected to the doping type. Moreover, they
pave the way to the exploration of general properties of HTS physics over a broad range of conditions, by means
of artificial compounds not constrained by the thermodynamic limitations governing the chemical stability of
bulk materials.