A four-band hexapole model of a honeycomb plasmonic crystal exhibits symmetry-enforced nodal loops around K and K' that survive weak symmetry breaking and can be gapped by a Kekulé distortion.
Nodal-link semimetals
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abstract
In topological semimetals, the valence band and conduction band meet at zero-dimensional nodal points or one-dimensional nodal rings, which are protected by band topology and symmetries. In this Rapid Communication, we introduce "nodal-link semimetals", which host linked nodal rings in the Brillouin zone. We put forward a general recipe based on the Hopf map for constructing models of nodal-link semimetal. The consequences of nodal ring linking in the Landau levels and Floquet properties are investigated.
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Nodal lines in a honeycomb plasmonic crystal with synthetic spin
A four-band hexapole model of a honeycomb plasmonic crystal exhibits symmetry-enforced nodal loops around K and K' that survive weak symmetry breaking and can be gapped by a Kekulé distortion.