A topological Hund nodal line antiferromagnet.

ABSTRACT: The interplay of topology, magnetism, and correlations gives rise to intriguing phases of matter. In this study, through state-of-the-art angle-resolved photoemission spectroscopy, density functional theory, and dynamical mean-field theory calculations, we visualize a fourfold degenerate Dirac nodal line at the boundary of the bulk Brillouin zone in the antiferromagnet YMn₂Ge₂. We further demonstrate that this gapless, antiferromagnetic Dirac nodal line is enforced by the combination of magnetism, space-time inversion symmetry, and nonsymmorphic lattice symmetry. The corresponding drumhead surface states traverse the whole surface Brillouin zone. YMn₂Ge₂ thus serves as a platform to exhibit the interplay of multiple degenerate nodal physics and a

SUBMITTER: Yang XP 

PROVIDER: S-EPMC11327286 | biostudies-literature | 2024 Aug

REPOSITORIES: biostudies-literature