Surface versus Bulk Coulomb Correlations in Photoemission Spectra ofSrVO3andCaVO3

A. Liebsch
2003 Physical Review Letters  
Recent photoemission spectra of the perovskite series Sr_xCa_1-xVO_3 revealed strong modifications associated with surface contributions. To study the effect of Coulomb correlations in the bulk and at the surface the quasi-particle spectra are evaluated using the dynamical mean field theory. It is shown that as a result of the reduced coordination number of surface atoms correlation effects are stronger at the surface than in the bulk, in agreement with experiment.
doi:10.1103/physrevlett.90.096401 pmid:12689243 fatcat:kh2u23mcgnbwxoonseqku3ev6i