Regensburg 2019 – wissenschaftliches Programm

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SYSD: Symposium SKM Dissertation-Prize 2019

SYSD 1: SKM Dissertation Prize

SYSD 1.2: Hauptvortrag

Montag, 1. April 2019, 09:50–10:10, H2

Spin scattering of topologically protected electrons at defects — •Philipp Rüßmann — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany

Topological materials and their transport properties are a field of great interest, as research in this area has produced promising material candidates for future low-power electronics or even quantum information technology. Like in any other material, defects are unavoidable and ubiquitous, which makes the understanding and control of their microscopic physical properties and their interactions one of the major pieces missing in the puzzle around topological-materials-based technology.

In this talk I will present a quantitative picture of the impurity scattering of topologically protected electrons, studied at the examples of strong three-dimensional topological insulators as well as type-II Weyl semimetals. Using ab initio calculations, I will highlight the importance of resonances in the scattering potential of defects, which gives a unified view on quasiparticle interference, quantum coherence, and magnetic interactions in topological matter. The very good agreement between our theoretical results and several different experiments such as STM, XMCD, or ARPES sets the foundations for tuning transport properties and controlling the magnetization in the fascinating class of topological materials in the future.