Title: Solving the multi-site and multi-orbital Dynamical Mean Field Theory using Density Matrix Renormalization,
Abstract: We implement an efficient numerical method to calculate response functions of
complex impurities based on the Density Matrix Renormalization Group (DMRG) and
use it as the impurity-solver of the Dynamical Mean Field Theory (DMFT). This
method uses the correction vector to obtain precise Green's functions on the
real frequency axis at zero temperature. By using a self-consistent bath
configuration with very low entanglement, we take full advantage of the DMRG to
calculate dynamical response functions paving the way to treat large effective
impurities such as those corresponding to multi-orbital interacting models and
multi-site or multi-momenta clusters. This method leads to reliable
calculations of non-local self energies at arbitrary dopings and interactions
and at any energy scale.