SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 39: Weyl Semimetals
MA 39.1: Vortrag
Donnerstag, 30. März 2023, 11:30–11:45, HSZ 403
Topological spin textures stabilised by Weyl fermions — •Juba Bouaziz1, Gustav Bihlmayer1, Julie B. Staunton2, and Stefan Blügel1 — 1Peter Grünberg Institut Forschungszentrum Jülich — 2The university of Warwick
Rare-earth intermetallic (REI) constitute a playground for the realization of topological spin textures relying on Ruderman-Kittel-Kasuya-Yosida (RKKY) interactions between the localized 4f-moments [1]. In non-centrosymmetric REI, namely REAlGe (Si), the breaking of inversion symmetry generates Weyl nodes which display interesting topological properties. The Weyl fermions mediate highly anisotropic RKKY interactions leading to the emergence of Kitaev (KT) and Dzyloshinksii-Moriya (DM) interactions. The incommensurate magnetic order present in these systems can be tied to the nesting of topological Fermi pockets [2]. We perform a systematic first-principles analysis in the framework of the DFT+U for REAlGe (RE=Ce-Gd) and investigate the contributions of the different exchange interactions (isotropic, DM, and KT) to incommensurate order. The local crystal field coefficients are computed from first-principles as well and are used to evaluate the magneto-crystalline anisotropy. Finally, we employ atomistic spin-dynamic simulations and identify the magnetic phases that are stabilized in presence of an external magnetic field. Our analysis aims at drawing a direct connection between the topology of the electronic band structure and the topology of the spin structures in real space. [1] J. Bouaziz et al. PRL 128, 157206 (2022) [2] J. Gaudet et al. Nat Mat 20, 1650 (2021)