Dresden 2020 – wissenschaftliches Programm

Die DPG-Frühjahrstagung in Dresden musste abgesagt werden! Lesen Sie mehr ...

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

O: Fachverband Oberflächenphysik

O 81: Poster Session - New Methods: Theory

O 81.1: Poster

Mittwoch, 18. März 2020, 18:15–20:00, P2/EG

Specular-diffusive decomposition of the transmission functionMichael Czerner1,2, Jonas F. Schäfer-Richarz1,2, and •Christian Heiliger1,21Institut 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.

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2020 > Dresden