Ulrich Eckern

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A diversity of spin Hall effects in metallic systems is known to rely on Mott skew scattering. In this work its high-temperature counterpart, phonon skew scattering, which is expected to be of foremost experimental relevance, is investigated. In particular, the phonon skew scattering spin Hall conductivity is found to be practically T independent for(More)
The frequency-dependent response of a one-dimensional fermion system is investigated using Current Density Functional Theory (CDFT) within the local approximation (LDA). DFT-LDA, and in particular CDFT-LDA, reproduces very well the dispersion of the collective excitations. Unsurprisingly, however, the approximation fails for details of the dynamic response(More)
The electronic and magnetic properties of the interfaces between the half-metallic Heusler alloys NiMnSb, NiMnSi, and MgO have been investigated using first-principles density-functional calculations with projector augmented wave potentials generated in the generalized gradient approximation. In the case of the NiMnSb/MgO (100) interface, the(More)
– We study a one-dimensional Bose system with repulsive δ-function interaction in the presence of an SU(2) intrinsic degree of freedom on the basis of the coordinate Bethe ansatz. The ground state and the low-lying excitations are determined by both numerical and analytical methods. It is shown that the ground state is an isospin-ferromagnetic state, and(More)
Nuttachai Jutong,1 Ivan Rungger,2 Cosima Schuster,1 Ulrich Eckern,1 Stefano Sanvito,2 and Udo Schwingenschlögl3 1Institut für Physik, Universität Augsburg, 86135 Augsburg, Germany 2School of Physics and CRANN, Trinity College, Dublin 2, Ireland 3KAUST, PSE Division, Thuwal 23955-6900, Kingdom of Saudi Arabia (Received 9 July 2012; revised manuscript(More)
The effect of Gd doping and O deficiency on the electronic structure, exchange interaction, and Curie temperature of EuO in the cubic and tetragonal phases is studied by means of density functional theory. For both defects, the Curie temperature is found to exhibit a distinct maximum as a function of the defect concentration. The existence of optimal defect(More)
L. Chioncel,1,2 C. Morari,3 A. Östlin,4 W. H. Appelt,1,2 A. Droghetti,5 M. M. Radonjić,2,6 I. Rungger,7,* L. Vitos,4 U. Eckern,8 and A. V. Postnikov9 1Augsburg Center for Innovative Technologies, University of Augsburg, 86135 Augsburg, Germany 2Theoretical Physics III, Center for Electronic Correlations and Magnetism, Institute of Physics, University of(More)
We study the boundary impurity-induced critical behavior in an integrable SU(2)-invariant model consisting of an open Heisenberg chain of arbitrary spin-S (Takhatajian-Babujian model) interacting with an impurity of spin ~ S′ located at one of the boundaries. For S = 1/2 or S′ = 1/2, the impurity interaction has a very simple form J ~ S1 · ~ S′ which(More)
The electronic structure of VO2 is studied in the frameworks of local density approximation (LDA) and LDA+U to give a quantitative description of the metal-insulator (MI) transition in this system. It is found that, both structural distortion and the local Coulomb interaction, play important roles in the transition. An optical gap, comparable to the(More)