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.
(b) Folding of the nodal lines at K, K′ of the honeycomb lattice onto the Γ point
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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.