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Metallic behavior of band-insulator/ Mott-insulator interfaces was observedin artificial perovskite superlattices such as in nanoscale SrTiO3/LaTiO3multilayers. Applying a semiclassical perspective to the parallel electronictransport we identify two major ingredients relevant for such systems: i) thequantum confinement of the conduction electrons (superlattice modulation) leadsto a complex, quasi-two dimensional subband structure with both hole- andelectron-like Fermi surfaces. ii) strong electron-electron interaction requiresa substantial renormalization of the quasi-particle dispersion. We characterizethis renormalization by two sets of parameters, namely, the quasi-particleweight and the induced particle-hole asymmetry of each partially filledsubband. In our study, the quasi-particle dispersion is calculatedself-consistently as function of microscopic parameters using the slave-bosonmean-field approximation introduced by Kotliar and Ruckenstein. We discuss theconsequences of strong local correlations on the normal-state free-carrierresponse in the optical conductivity and on the thermoelectric effects.

Role of multiple subband renormalization in the electronic transport of correlated oxide superlattices