  The Mott-insulating distorted perovskite SmTiO$_3$, doped with a single SrO
layer in a quantum-well architecture is studied by the combination of density
functional theory with dynamical mean-field theory. A rich correlated
electronic structure in line with recent experimental investigations is
revealed by the given realistic many-body approach to a large-unit-cell oxide
heterostructure. Coexistence of conducting and Mott-insulating TiO$_2$ layers
prone to magnetic order gives rise to multi-orbital electronic transport beyond
standard Fermi-liquid theory. First hints towards a pseudogap opening due to
electron-electron scattering within a background of ferromagnetic and
antiferromagnetic fluctuations are detected.
