Regensburg 2022 – scientific programme

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MA: Fachverband Magnetismus

MA 40: Weyl Semimetals

MA 40.4: Talk

Friday, September 9, 2022, 10:15–10:30, H48

Prediction of a new type-I Weyl semimetal in a full-Heusler compound — •Davide Grassano and Nicola Marzari — Theory and Simulations of Materials (THEOS) and National Center for Computational Design and Discovery of Novel Materials (MARVEL), Ecole Polytechnique Federale de Lausanne, CH-1015 Lausanne, Switzerland

Weyl semimetals are a class of topological semimetals with linear band crossings close to the Fermi level with non-trivial chirality, the existence of which gives rise to several exotic physical properties[1,2]. In order for such crossings to exist, either time-reversal or inversion symmetry must be broken[3]. Here we identify a new inversion-breaking Weyl semimetal. This material shows several features that are comparatively more intriguing with respect to other known inversion-breaking Weyl semimetals. The distance between two neighboring nodes is large enough to observe a wide range of linear dispersion in the band and only one kind of nodes can be identified. Finally, the lack of other trivial points insures that the low-energy properties of the material can be directly related to the presence of the Weyl nodes.

[1] Murakami S., New Journal of Physics 9.9 (2007):356

[2] Armitage NP, Mele EJ, Vishwanath A. - Rev. Mod. Phys. 90.1 (2018):015001

[3] Wan, Xiangang, et al. Phys. Rev. B 83.20 (2011): 205101