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

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

2008-12-02

arxiv.org/abs/0812.0442v3

Properties and Applications of Thermoelectric Materials, 181-191 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 4 figures

Scientific paper

10.1007/978-90-481-2892-1_11

Metallic behavior of band-insulator/ Mott-insulator interfaces was observed in artificial perovskite superlattices such as in nanoscale SrTiO3/LaTiO3 multilayers. Applying a semiclassical perspective to the parallel electronic transport we identify two major ingredients relevant for such systems: i) the quantum confinement of the conduction electrons (superlattice modulation) leads to a complex, quasi-two dimensional subband structure with both hole- and electron-like Fermi surfaces. ii) strong electron-electron interaction requires a substantial renormalization of the quasi-particle dispersion. We characterize this renormalization by two sets of parameters, namely, the quasi-particle weight and the induced particle-hole asymmetry of each partially filled subband. In our study, the quasi-particle dispersion is calculated self-consistently as function of microscopic parameters using the slave-boson mean-field approximation introduced by Kotliar and Ruckenstein. We discuss the consequences of strong local correlations on the normal-state free-carrier response in the optical conductivity and on the thermoelectric effects.

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