Correlation-driven electronic nematicity in the Dirac semimetal BaNiS₂.

ABSTRACT: In BaNiS₂, a Dirac nodal line band structure exists within a two-dimensional Ni square lattice system, in which significant electronic correlation effects are anticipated. Using scanning tunneling microscopy (STM), we discover signs of correlated-electron behavior, namely electronic nematicity appearing as a pair of C₂-symmetry striped patterns in the local density-of-states at ∼60 meV above the Fermi energy. In observations of quasiparticle interference, as well as identifying scattering between Dirac cones, we find that the striped patterns in real space stem from a lifting of degeneracy among electron pockets at the Brillouin zone boundary. We infer a momentum-dependent energy shift with d-form factor, which we model numerically within a density wave

SUBMITTER: Butler CJ 

PROVIDER: S-EPMC9894198 | biostudies-literature | 2022 Dec

REPOSITORIES: biostudies-literature