2020/03/31 by Matthias Redies, M. Redies, F. R. Lux +9
Materials Science · Physics and Astronomy · #Band gap #Condensed matter physics #Ferromagnetism #Graphene research and applications #Hall effect #Magnetic anisotropy #Magnetic field #Magnetic properties of thin films #Magnetism #Magnetization #Orbital magnetization #Physics #Quantum mechanics #Semimetal #Skyrmion #Spintronics #Topological Materials and Phenomena #Topological insulator #Topology (electrical circuits) #Weyl semimetal #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.102.184407
published as Phys. Rev. B 102, 184407 (2020)
arxiv created 2020/08/25 · openalex publication_date 2020/11/09 · arxiv updated 2020/11/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
As skyrmion lattices are attracting increasing attention owing to their properties driven by real-space topology, properties of magnetic Weyl semimetals with complex k-space topology are moving into the focus of research. We consider Hall transport properties and orbital magnetism of skyrmion lattices imprinted in topological semimetals by employing a minimal model of a mixed Weyl semimetal which, as a function of the magnetization direction, exhibits two Chern insulator phases separated by a Weyl state. We find that while the orbital magnetization is topologically robust and Hall transport properties exhibit a behavior consistent with that expected for the recently discovered chiral Hall effect [F. R. Lux et al., Phys. Rev. Lett. 124, 096602 (2020)], their evolution in the region of the Chern insulator gap is largely determined by the properties of the so-called mixed topology ring states, emerging in domain walls that separate the skyrmion core from the ferromagnetic background. In particular, we show that these localized ring states possess a robust orbital chirality which reverses sign as a function of the skyrmion radius, thereby mediating a smooth switching dynamics of the orbital magnetization. We speculate that while the emergent ring states can possibly play a role in the physics of Majorana states, probing their properties experimentally can provide insights into the details of skyrmionic spin structures.