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Regensburg 2022 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 40: Weyl Semimetals

MA 40.1: Vortrag

Freitag, 9. September 2022, 09:30–09:45, H48

Magneto-optical detection of topological contributions to the anomalous Hall effect — •Felix Schilberth1,2, Nico Unglert3, Lilian Prodan1, Christine Kuntscher4, Liviu Chioncel3, and Sándor Bordács21Experimentalphysik V, Augsburg University, Augsburg, Germany — 2Department of Physics, BME Budapest, Hungary — 3Theoretische Physik III, Augsburg University, Augsburg, Germany — 4Experimentalphysik II, Augsburg University, Augsburg, Germany

The anomalous Hall effect (AHE) is a profound manifestation of non-trivial band structure topology in magnetic materials. The ambiguous separation of its intrinsic and extrinsic contributions leads to a fundamental limitation in identifying topological states based on common magnetotransport experiments. Here we demonstrate, via a case study on the prominent topological kagome magnet Fe3Sn2, that the intrinsic contribution to AHE can be determined unambiguously from the broadband spectrum of the optical Hall effect, obtained by energy-resolved magneto-optical Kerr-effect (MOKE) measurements. Using MOKE spectroscopy complemented with material-specific theory, we identified the interband excitations responsible for the intrinsic AHE. We found that low-energy transitions, tracing "helical volumes" in momentum space reminiscent of the formerly predicted helical nodal lines, substantially contribute to the AHE, which is further increased by contributions from multiple higher-energy interband transitions. Our calculation also shows that local Coulomb interactions lead to important band reconstructions near the Fermi level.

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