Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 101: Correlated Electrons: Other Materials
TT 101.5: Vortrag
Donnerstag, 15. März 2018, 16:30–16:45, HFT-FT 101
Spin-polarized ballistic conduction through correlated Au-NiMnSb-Au heterostructures — Cristian Morari3, •Wilhelm Appelt1,4, Andreas Östlin2, Ulrich Eckern1, and Liviu Chioncel2 — 1Theoretical Physics II, Institute of Physics, University of Augsburg, 86135 Augsburg, Germany — 2Theoretical Physics III, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, 86135 Augsburg, Germany — 3National Institute for Research and Development of Isotopic and Molecular Technologies, Cluj-Napoca, Romania. — 4Augsburg Center for Innovative Technologies, University of Augsburg, 86135 Augsburg, Germany
We examine the ballistic conduction through Au-NiMnSb-Au heterostructures consisting of up to four units of the half-metallic NiMnSb in the scattering region, using density functional theory (DFT) in combination with dynamical mean-field theory (DMFT). For a single NiMnSb unit the transmission function displays a spin polarization of around 50% in a window of 1 eV centered around the Fermi level. By increasing the number of layers, an almost complete spin polarization of the transmission is obtained in this energy range. Supplementing the DFT calculations with local electronic interactions, of Hubbard-type on the Mn sites, leads to a hybridization between the interface and many-body states. The significant reduction of the spin polarization seen in the density of states is not apparent in the conduction electron transmission, which suggests that the hybridized interface and many-body induced states are localized.