Weyl-Kondo Semimetals in the Quantum Critical Regime

The interplay between interaction and topology is of extensive current interest [1]. In insulating systems, strong correlations are known to produce new topological phases, as exemplified by fractional quantum Hall effect. Whether correlations can drive novel gapless topological phases is an open question. Recently [2, 3], we have established that symmetry constraints also apply to the Green’s function, leading to the possibility of non-Fermi liquid topological semimetal states with correlated-induced emergent excitations. The first such realization happens in a quantum critical phase [2]. Here, we show [3] that Weyl-Kondo semimetal develops near a quantum critical point in a Kondo lattice system. We present the properties and topological signatures of this state. Our work charts a broad path to explore the relationship between gapless electronic topology and strong correlations.





[1] S. Paschen & Q. Si, Nat. Rev. Phys. 3, 9 (2021).



[2] H. Hu et al., arXiv:2110.06182



[3] L. Chen, H. Hu, et al., unpublished (2023)