Renormalized quasiparticles, topological monopoles and superconducting line nodes in heavy fermion CeTX$_3$ compounds

TL;DR

This paper investigates the electronic structure of non-centrosymmetric CeTX$_3$ heavy-fermion superconductors, revealing topological nodal lines, Dirac and Weyl points, and their influence on superconducting line nodes, emphasizing the role of correlations.

Contribution

It uncovers the presence of topological nodal lines and Weyl points in CeTX$_3$ compounds and shows how correlations bring these features closer to the Fermi energy.

Findings

Topological nodal lines and Weyl points are present in CeTX$_3$ compounds.

Correlations renormalize topological features closer to the Fermi energy.

Weyl nodal lines significantly influence the Fermi surface and superconducting line nodes.

Abstract

Non-centrosymmetric superconductors have recently attracted much attention, since the lack of inversion symmetry mixes spin singlet and triplet pairing states, which may allow the realization of topological superconductivity. In this work, we study the electronic properties of the family of inversion-broken CeTX$_3$ heavy-fermion superconductors, finding topological nodal lines as well as Dirac and Weyl points, which are renormalized closer to the Fermi energy by correlations. We find that the Weyl nodal lines have a substantial effect on the Fermi surface spin structure of the normal state, and lead to line nodes in the superconducting phase.