Self-consistent ladder dynamical vertex approximation

We present and implement a self-consistent D Gamma A approach for multiorbital models and ab initio materials calculations. It is applied to the one-band Hubbard model at various interaction strengths with and without doping, to the two-band Hubbard model with two largely different bandwidths, and to SrVO3. The self-energy feedback reduces critical temperatures compared to dynamical mean-field theory, even to zero temperature in two dimensions. Compared to a one-shot, non-self-consistent calculation the nonlocal correlations are significantly reduced when they are strong. In case nonlocal correlations are weak to moderate as for SrVO3, one-shot calculations are sufficient.

Automated summary

The self-consistent D Gamma A approach is successfully applied to multiorbital models and ab initio materials calculations, reducing nonlocal correlations and critical temperatures effectively.