Work

Weyl nodes in CeRu 4 Sn 6 studied by dynamical mean field theory

Year: 2026

Type: article

Abstract: The heavy fermion compound CeRu 4 Sn 6 was recently shown to exhibit a spontaneous nonlinear Hall effect, indicating its topological nature. This is consistent with the lack of inversion symmetry that allows for the existence of Weyl nodes. Here, we employ density functional theory combined with dynamical mean field theory, which is state of the art for strongly correlated materials, and study the topology of CeRu 4 Sn 6 . We find five inequivalent Weyl nodes of either type I or II, each having either 8 or 16 symmetry-related replicas. These Weyl nodes bridge the Kondo insulating gap, which is a direct but not an indirect gap. The Weyl points closest to the Fermi level are situated only 0.5 meV below it and have a very flat dispersion. Our results establish CeRu 4 Sn 6 as a model system for investigating the interplay between strong electronic correlations and nontrivial topology. These findings provide a theoretical foundation for future studies of quantum transport and interaction-driven topological phases in heavy fermion systems.

Source: Physical review. B./Physical review. B

DOI: 10.1103/8wcd-blpn

Authors: Jorūnas Dobilas, Martin Braß, Frank T. Ebel, Silke Paschen, Karsten Held

Institution: TU Wien

Language: English

Topic: Rare-earth and actinide compounds

Subfield: Condensed Matter Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Funders: Deutsche Forschungsgemeinschaft, Austrian Science Fund

Awards: G5849991543, Quantum phase transitions and collective modes