Tunable Octdong and Spindle-Torus Fermi Surfaces in Kramers Nodal Line Metals.

ABSTRACT: Kramers nodal lines are doubly degenerate band crossings in achiral non-centrosymmetric crystals, arising from spin-orbit coupling and connecting time-reversal invariant momenta. When intersecting the Fermi level, they generate exotic three-dimensional Fermi surfaces, in some cases described by two-dimensional massless Dirac fermions, enabling enhanced graphene-like physics such as quantized optical conductivity and large anomalous Hall effects. However, no experimental realization of such materials has been reported. Here, we identify Kramers nodal line metals beyond the case of Fermi surfaces enclosing a single time-reversal invariant momentum. Using angle-resolved photoemission spectroscopy and first-principles calculations, we show that 3R-TaS₂ and 3R-NbS₂ host op

SUBMITTER: Domaine G 

PROVIDER: S-EPMC12705649 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature