Surface versus bulk Mott transition in Ca${}_x$La${}_{1-x}$VO${}_3$

The Mott insulator LaVO${}_3$ is known to become metallic if La is replaced by small concentrations of Ca. Since surface quasi-particle spectra of various perovskites are more strongly correlated than their bulk spectra, the coexistence of a metallic bulk and an insulating surface layer might be feasible. To investigate this possibility the dynamical mean field theory is used to evaluate the quasi-particle spectra in the bulk and at the surface of Ca${}_x$La${}_{1-x}$VO${}_3$ for various Ca concentrations.