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MA: Fachverband Magnetismus

MA 24: Weyl Semimetals (joint session MA/TT)

MA 24.5: Vortrag

Dienstag, 10. März 2026, 15:00–15:15, POT/0361

Magnetoconductance in Chiral Topological Semimetals — •Ricardo Manuel Sousa Barbosa and Annika Johansson — Max Planck Institute of Microstructure Physics, Weinberg 2, 06120 Halle (Saale), Germany

Chiral topological semimetals [1] are a class of quantum materials whose crystal symmetries enforce multifold band crossings with nonzero topological charge, hosting symmetry-protected chiral fermionic quasiparticles, long surface Fermi arcs, and enhanced optical and transport responses. These Weyl semimetals [2] are three-dimensional materials that exhibit multiple Weyl nodes that act as point-like sources and sinks of Berry curvature in momentum space, and provide a condensed-matter realization of the chiral anomaly [3], a field-induced nonconservation of electrons associated with a given Weyl node, which manifests as a positive longitudinal magnetoconductance.

We investigate the magnetotransport properties of compounds in space group 198 [4], which host four- and six-fold degenerate Weyl nodes at the Γ and R points, respectively, with Chern numbers up to ± 4. Using a semiclassical approach, we compute the resulting magnetoconductance, enabling a detailed analysis of the unconventional electronic responses characteristic of these materials.

[1] N.B.M. Schröter et al., Nature Physics 15, 759-765 (2019); [2] M. Z. Hasan et al., Annu. Rev. Condens. Matter Phys. 8, 289-309 (2017); [3] F. Bladuini et al., Nat. Commun. 15, 6526 (2024) [4] D.A. Pshenay-Severin et al., J. Phys.: Condens. Matter 30, 135501 (2018)

Keywords: chiral topological semimetal; Weyl semimetal; magnetotransport; semiclassical theory