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TT: Fachverband Tiefe Temperaturen

TT 44: Correlated Electrons: Method Development

TT 44.4: Vortrag

Mittwoch, 3. April 2019, 15:45–16:00, H7

Slave rotor approach to impurity models with ligand orbitals — •Jakob Steinbauer¹ and Silke Biermann^1,2,3 — ¹Ecole Polytechnique, Palaiseau, France — ²Collège de France, Paris, France — ³European theoretical spectroscopy facility, Europe

We propose a slave (spin/rotor) method for the solution of many-orbital quantum impurity problems, which maps the original problem with correlated and ligand orbitals onto one with an effective correlated shell only. This is particularly useful for the dynamical mean field theory treatment of transition metal oxides where the interactions between ligand states and d-states are all too often simply neglected. We derive a general formalism relying on an optimized effective model obtained from the variational principle of Feynman and Peierls and apply our method to a minimal 2-band model with orbitals of d and p character.