Seminarium Fizyki Materii Skondensowanej

Application of the dynamical mean-field theory (DMFT) to multi-band models obtained with ab initio bandstructure methods has lead to betterqualitative and quantitative understanding of correlated-electronmaterials. However, mostly one-particle or local quantities were studiedwithin this approach so far. We will present an efficient numerical methodfor calculation of the non-local two-particle response functions.Computations of this type can be used to search for divergencies, whichidentify instabilities towards long-range ordering. Applications tobenchmark cases such as single-band and two-band Hubbard model will bepresented.