Spin-polarized ballistic conduction through correlated Au-NiMnSb-Au heterostructures

ORAL

Abstract

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 spin-polarization of the conduction electron transmission, which suggests that the hybridized interface and many-body induced states are localized.1
1C. Morari, W. H. Appelt, A. Prinz-Zwick, U. Eckern, U. Schwingenschlögl, A. Östlin, L. Chioncel, arXiv:1709.00983

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Presenters

  • Wilhelm Appelt

    Institute of Physics, University of Augsburg

Authors

  • Christian Morari

    National Institute for Research and Development of Isotopic and Molecular Technologies

  • Wilhelm Appelt

    Institute of Physics, University of Augsburg

  • Andreas Östlin

    Theoretical Physics III, Center for Electronic Correlations and Magnetism, University of Augsburg, Institute of Physics, University of Augsburg

  • Andreas Prinz-Zwick

    Institute of Physics, University of Augsburg

  • Ulrich Eckern

    University of Augsburg, Institute of Physics, University of Augsburg

  • Udo Schwingenschlogl

    Physical Science and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST)

  • Liviu Chioncel

    Theoretical Physics III, Center for Electronic Correlations and Magnetism, University of Augsburg, Institute of Physics, University of Augsburg