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MM: Fachverband Metall- und Materialphysik

MM 9: Poster

MM 9.40: Poster

Montag, 17. März 2025, 18:30–20:30, P1

Semiclassical transport in multiple Weyl points — •Ricardo Barbosa, Stuart Parkin, and Annika Johansson — Max Planck Institute of Microstructure Physics, Weinberg 2, 06120 Halle (Saale), Germany

We investigate transport contributions[1,2] in three-dimensional materials exhibiting multiple Weyl nodes[2,3], which are linear band touchings acting as point-like sources and sinks of Berry curvature in momentum space, often referred to as "Weyl-Berry monopoles". Specifically, we analyze the transport properties of CoSi[4,5], a chiral topologically nontrivial semimetal with band-touching points of higher-than-two-fold degeneracy and nonzero Chern numbers. Notably, at the Γ and R points, the band-touching nodes are four- and six-fold degenerate, respectively, with Chern numbers up to ± 4. Using the Boltzmann transport equation[6], we investigate how these features give rise to unconventional electronic properties, focusing on the corresponding charge and node conductivities.

References [1] H. Rostami and M. Polini, Physical Review B 97, 195151 (2018) [2] J.E. Sipe and A. I. Shkrebtii, Phys. Rev. B 61, 533 (2000) [3] B. Yan and C. Felser, Annu. Rev. Condens. Matter Phys. 8, 337 (2017) [4] N.P. Armitage et al., Rev. Mod. Phys. 90, 015001 (2018) [5] D.A. Pshenay-Severin et al., J. Phys.: Condens. Matter 30, 135501 (2018) [6] P. Tang et al., Phys. Rev. Lett. 119, 206402 (2017) [7] D. Kaplan et al., Phys. Rev. Lett. 132, 026301 (2024)

Keywords: Topology; Weyl nodes; Boltzmann transport equation; Semimetal; Conductivity