Dielectric function and collective plasmon modes of a quasi-two-dimensional finite confining potential semiconductor quantum well

► Self-consistent method of semiconductor QW dielectric response is developed. ► Dielectric function of a realistic EuS/PbS/EuS QW is calculated. ► Q2D plasmon dispersion relations of a EuS/PbS/EuS QW are determined. ► Observation potential of Q2D plasmons at low densities in EuS/PbS/EuS QW is elaborated.