Plasmonic disks in a Lieb lattice exhibit Z2 topological order and helical boundary modes via intrinsic next-nearest-neighbor coupling that enforces synthetic time-reversal symmetry.
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Helical boundary modes from synthetic spin in a plasmonic lattice
Plasmonic disks in a Lieb lattice exhibit Z2 topological order and helical boundary modes via intrinsic next-nearest-neighbor coupling that enforces synthetic time-reversal symmetry.