Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 21: Topological Semimetals 1

TT 21.3: Vortrag

Dienstag, 17. März 2020, 10:00–10:15, HSZ 103

Optical fingerprinting of magnetic reorientation in Weyl semimetals — •Ananya Biswas1, Hechang Lei2, Martin Dressel1, and Ece Uykur111. Physikalisches Institut, Universität Stuttgart, Germany — 2Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing, China

Three dimensional magnetic Weyl semimetals are relatively new members of this topological realm, where the electron correlations are intertwined with flat bands and heavy fermions. They have been investigated extensively via transport and magneto-transport studies, while the optical investigations on these systems are scarce. Here, we focus on the optical characterization of the Fe3Sn2 single crystals that has shown to be one of the magnetic Weyl semimetal candidates. This material is a soft ferromagnet with distinguished flat bands and Weyl nodes, where the Tc=640 K and a spin reorientation takes place at ∼ 150 K. Our optical results demonstrate the typical signatures of the electron correlations together with the optical anomalies at the spin reorientation temperature indicating the close relation of the electronic and underlying magnetic structure in these new class of materials.

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