Multi-band non-equilibrium GW+EDMFT formalism for correlated insulators

Understand

We study the dynamics of charge-transfer insulators after a photo-excitation using the three-band Emery model which is relevant for the description of cuprate superconductors.

• We provide a detailed derivation of the nonequilibrium extension of the multi-band GW+EDMFT formalism and the corresponding downfolding procedure.
• The Peierls construction of the electron-light coupling is generalized to the multi-band case resulting in a gauge invariant combination of the Peierls intra-band acceleration and dipolar intra-band transitions.
• We apply the formalism to the study of momentum-dependent (inverse) photo-emission spectra and optical conductivities.