  We investigate the effects of spatial inhomogeneities on the entanglement of
modes of strongly correlated systems in the framework of small Fermi-Hubbard
chains. We find regimes where entanglement is strongly enhanced by the presence
of inhomogeneities. This contrasts recent reports of entanglement destruction
due to inhomogeneities. We further study this phenomenon using concepts of
Density Functional Theory and, thus, provide a general recipe for the
prediction of entanglement enhancement in nanostructures. We find enhancement
of up to ~24%, as compared to impurity-free chains.
