Momentum-selective opening of the Mott pseudogap indused by strong magnetic fluctuations

Two-dimensional electronic systems in the regime of strong electronic Coulomb correlations are particularly prone to non-local correlation effects not captured within dynamical mean field theory (DMFT). Here, we deploy a novel diagrammatic extension of DMFT, dubbed D-TRILEX, that allows one to account for non-local fluctuations. As expected, at high temperatures, where magnetic fluctuations are weak, non-local effects are small and the Mott transition is well described by DMFT. Upon lowering the temperature, however, the increasing magnetic fluctuations contribute to the formation of the Mott gap. We quantify their role in the Mott transition by studying the momentum-selective opening of the Mott pseudogap at the nodal and anti-nodal points.