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Weyl nodes in CeRu4Sn6 studied by dynamical mean field theory

Jorūnas Dobilas1,2,*, Martin Braß2, Frank T. Ebel2, Silke Paschen2, and Karsten Held2,†

  • 1Department of Fundamental Research, FTMC, 10257 Vilnius, Lithuania
  • 2Institute of Solid State Physics, TU Wien, 1040 Vienna, Austria

  • *Contact author: jorunas.dobilas@ftmc.lt
  • †Contact author: held@ifp.tuwien.ac.at
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Phys. Rev. B 113, 085140 – Published 23 February, 2026

DOI: https://doi.org/10.1103/8wcd-blpn

Abstract

The heavy fermion compound CeRu4Sn6 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 CeRu4Sn6. 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 ab initio results establish CeRu4Sn6 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.

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Phys. Rev. B 113, 085140– Published 23 February, 2026
  • Received 27 August 2025
  • Revised 16 January 2026
  • Accepted 26 January 2026
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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