Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 81: Poster Session - New Methods: Theory
O 81.1: Poster
Wednesday, March 18, 2020, 18:15–20:00, P2/EG
Specular-diffusive decomposition of the transmission function — Michael Czerner1,2, Jonas F. Schäfer-Richarz1,2, and •Christian Heiliger1,2 — 1Institut für theoretische Physik, Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 16, 35392 Gießen — 2Zentrum für Materialforschung (LaMa), Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 16, 35392 Gießen
A conscious design of electronic transport is crucial for all nanoelectronic devices. This necessitates a precise understanding of the behaviour of electrons as they traverse a device. To this end, k∥-resolved transmission maps provide a valuable tool for relating the observed phenomena, such as tunnel magnetoresistance effects, to microscopic processes. A description by slabs of material with a 1×1-supercell is insufficient when imperfections within the device are to be described. Impurities, dislocations, skyrmions, and thermal disorder may modulate the transport properties of a nanoelectronic device. In essence, such imperfections break translational invariance. Because most such defects are localized, the transmission can be projected onto the perfectly ordered leads of the transport system. Thus, a transmission map T(k∥,k∥′) connecting Bloch states in the left and right lead can be recovered. This transmission map may be split into a specular part, which is k∥ conserving, and a diffusive part, which allows scattering between k∥-vectors of the leads. We implemented this decomposition of transmission maps in our Korringa-Kohn-Rostoker code. As a test case, we show the transmission through iron bulk, where either atomic positions or their magnetic moments were randomly displaced.