Weyl-Kondo semimetals in hexagonal lattices

The interplay between symmetry, topology, and interactions can lead to correlated gapless topological states, as exemplified by the Weyl-Kondo semimetals (WKSMs) [1,2,3]. In WKSMs, the Kondo coupling between itinerant conduction electrons and local magnetic moments gives rise to the heavy quasiparticle excitations whose low-energy excitations exhibit Weyl points or Weyl nodal lines stabilized by topology or crystalline symmetries. Previous studies have identified WKSMs in diamond and square-net lattice systems. Hexagonal lattices represent an important platform for gapless topology. As such, in this work, we perform calculations to identify WKSMs in hexagonal lattice models. Material realizations of our results, as well as their general implications, will be discussed.

Funding acknowledgement: Supported by the Carl and Lillian Illig Postdoctoral Fellowship from the Smalley-Curl Institute at Rice University (K.-S. L.), the AFOSR (FA9550-21-1-0356), NSF (DMR-2220603) and VBFF (N00014-23-1-2870).

[1] H.-H. Lai et al., Proc. Natl. Acad. Sci. 115, 93 (2018)

[2] L. Chen et al., Nat. Phys. 18, 1341 (2022)

[3] Y. Fang et al., arXiv:2403.02295 (2024)