Berlin 2015 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 39: Posters II (Topological insulators; Graphene; Spintronics and spin physics; Quantum information science)

HL 39.20: Poster

Dienstag, 17. März 2015, 14:00–20:00, Poster F

Modeling Magnetism of Diluted Magnetic Semiconductors using the Gutzwiller Method — •Thorben Linneweber — Technische Universität Dortmund, Lehrstuhl für Theoretische Physik II, 44221 Dortmund

Diluted magnetic semiconductors are materials in which magnetic ions substitutionally or interstitially replace a fraction of the cations of the semiconductor host material. We aim to describe the magnetic properties of Cd_1−xMn_xTe by combining the theory of strongly correlated electrons to semiconductor band theory. We use a multiband hubbard model with s,p-orbitals for the host and s,p,d-orbitals for the manganese ions. The one-particle hamiltonian is obtained via downfolding from DFT calculations using the Wannier90 Code. The effect of the strongly correlated Mn d-electrons is treated within the Gutzwiller method. To model the diluted nature of the magnetic substitutions a supercell approach is incorporated. As the manganese magnetic moment is known to be close to a S=5/2 state the central question is how much this state is an atomic-like Hund’s rule state. One of our further goals is to extract the coupling constants for a Heisenberg model.