Effect of a flat band on a multiband two-dimensional Lieb lattice with intra- and interband interactions
Julián Faúndez,
S G Magalhães,
P S Riseborough
et al.
Abstract:In this study, we explore the effect of a single flat band in the electronic properties of a ferromagnetic two-dimensional Lieb lattice using the multiband Hubbard model with polarized carriers, spin-up and spin-down. We employ the self-consistent dynamical mean field theory (DMFT) and a Green functions cumulant expansion around the atomic limit to obtain the correlated densities of states while varying the intra- and interband interactions. 
Our findings demonstrate a renormalization of the correlate… Show more
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