Transport properties in correlated systems: An analytical model

Several studies have so far investigated transport properties of strongly correlated systems. Interestingfeatures of these materials are the lack of resistivity saturation well beyond the Mott-Ioffe-Regel limit and thescaling of the resistivity with the hole density in underdoped cuprates. Due to the strongly correlated nature ofthese materials, mainly numerical techniques have been employed. A key role in this regard is thought to beplayed by the continuous transfer of spectral weight from coherent to incoherent states. In this paper weemploy a simple analytical expression for the electronic Green's function to evaluate both quasiparticle andtransport properties in correlated systems. Our analytical approach permits us to enlighten the specific role ofthe spectral transfer due to the correlation on different features. In particular we investigate the dependence ofboth quasiparticle and transport scattering rate on the correlation degree and the criterion for resistivitysaturation.