Hund's metal regimes and orbital selective Mott transitions in three band systems

FACIO, JORGE I.; CORNAGLIA, PABLO S.

Journal of physics. Condensed matter : an Institute of Physics journal

IOP PUBLISHING LTD

Año: 2019 vol. 31

We analyze the electronic properties of interacting crystal field split three band systems. Using a rotationally invariant slave boson approach we analyze the behavior of the electronic mass renormalization as a function of the intralevel repulsion U, the Hund´s coupling J, the crystal field splitting, and the number of electrons per site n. We first focus on the case in which two of the bands are identical and the levels of the third one are shifted by [Formula: see text] with respect to the former. We find an increasing quasiparticle mass differentiation between the bands, for system away from half-filling (n  =  3), as the Hubbard interaction U is increased. This leads to orbital selective Mott transitions where either the higher energy band (for 4  >  n  >  3) or the lower energy degenerate bands (2