Impurity solvers

Iterated perturbation theory

A cheap second-order solver for the DMFT impurity problem — transparent, and surprisingly faithful at half filling.

Every topic that uses this method, drawn from across all subjects.

• Dynamical Mean-Field Theory and the IPT Solver Mott Physics in Correlated Lattices DMFT maps the Hubbard model onto a self-consistent Anderson impurity problem — exact in infinite dimensions — retaining the full frequency dependence of the self-energy that the perturbative limits miss. With Landau Fermi-liquid theory for interpretation and the Iterated Perturbation Theory solver for the impurity, it tracks the metal across to the Mott insulator in one framework.