Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 47: Correlated Electrons: Other Materials
TT 47.4: Vortrag
Mittwoch, 9. März 2016, 11:15–11:30, H23
Construction of effective low-energy interactions for three-orbital cuprate models with electronic correlation — •Cornelia Hille1, Xiaodong Cao2, Carsten Honerkamp3, Philipp Hansmann2, and Sabine Andergassen1 — 1Institut für Theoretische Physik, Universität Tübingen, Tübingen, Germany — 2Max Planck Institute for Solid State research, Stuttgart, Germany — 3Institute for Solid State Theory, RWTH Aachen, Aachen, Germany
Real materials typically have involved bandstructures and a many-body solution of the full Hamiltonian is not feasible. To identify the most relevant degrees of freedom we often start from ab initio single particle (e.g. DFT, Hartree Fock, GW) calculations and integrate out states of high energy remaining with a low-energy effective Hamiltonian. For basically all transition metal oxides this procedure leads to the question if and how to include oxygen 2p states explicitly. We present effective low-energy interactions for three-orbital cuprate models calculated in a cRPA framework. We find effective copper d-state interactions which are strongly dynamically screened by transitions involving the oxygen 2p states.