Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 81: Correlated Electrons: Other Materials
TT 81.2: Talk
Thursday, March 12, 2026, 15:15–15:30, HSZ/0101
Non-quasiparticle states at a ferromagnetic oxide interface — Dylan Jones1,2, Andreas Östlin1,2, and •Liviu Chioncel1,2 — 1Theoretical Physics III, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, 86135 Augsburg, Germany — 2Augsburg Center for Innovative Technologies, University of Augsburg, 86135 Augsburg, Germany
We propose a minimal tight-binding model for the electronic interface layer of the LaAlO3/SrTiO3 heterostructure with oxygen vacancies. In this model, the effective carriers are subject to oxygen vacancy-induced magnetic impurities. Both the effects of random on-site potentials and Zeeman-like exchange interactions between correlated carriers and magnetic impurities are taken into account. By applying the combined coherent potential approximation (CPA) and dynamical mean field theory (DMFT) for a ferromagnetic state, we analyze how magnetic impurities generate incoherent non-quasiparticle spectral weight near the Fermi level and introduce a low-energy scale that is expected to be relevant for electronic transport at the interface.
Keywords: Correlation; Disorder; CPA; DMFT; Magnetism