Weyl nodes and hybrid nodal loop with spin–orbit coupling in W2TeSe

Abstract

Topological metals with unique fermionic states provide an attractive research platform for exploring various topological phenomena and have aroused great research interest. In this study, we employ first-principles calculations to predict that W2TeSe, a candidate for Weyl metal, exhibits the coexistence of type-I Weyl nodes and hybrid nodal loop. These topological features are protected by symmetries and remain robust against symmetries conserving perturbations, such as spin–orbit coupling. The number, energies, and separations of these Weyl points align with expectations for ideal topological fermions as they arise from low-energy gapless fermions near the Fermi level with significant momentum space separation.