Sep 12, 3:00 PM: ERC 201 - Joint JFI & IME Seminar - Professor Claudia Felser, Max ...

ABSTRACT: Topology a mathematical concept became recently a hot topic in condensed matter physics and materials science. One important criteria for the identification of the topological material is in the language of chemistry the inert pair effect of the s-electrons in heavy elements and the symmetry of the crystal structure [1]. Beside of Weyl and Dirac new fermions can be identified compounds via linear and quadratic 3-, 6- and 8- band crossings stabilized by space group symmetries [2]. In magnetic materials the Berry curvature and the classical AHE helps to identify interesting candidates. Magnetic Heusler compounds were already identified as Weyl semimetals such as Co2YZ [3,4], in Mn3Sn [5,6,7] and Co3Sn2S2 [8,9,10]. The Anomalous Hall angle helps to identify even materials in which a QAHE should be possible in thin films. Besides this k-space Berry curvature, Heusler compounds with non-collinear magnetic structures also possess real-space topological states in the form of magnetic antiskyrmions, which have not yet been observed in other materials [11]. Host: Peter Littlewood, 2-9879 or via email at littlewood@uchicago.edu. Persons who may need assistance please contact Brenda Thomas at 2-7156 or by email at bthomas@uchicago.edu.Date: September 12, 2019Time: 3:00 PM - 4:00 PM