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Bipartite quantum systems from the chiral universality classes admittopologically protected zero modes at point defects. However, intwo-dimensional systems these states can be difficult to separate fromcompacton-like localized states that arise from flat bands, formed if the twosublattices support a different number of sites within a unit cell. Here weidentify a natural reduction of chiral symmetry, obtained by coupling sites onthe majority sublattice, which gives rise to spectrally isolated point-defectstates, topologically characterized as zero modes supported by thecomplementary minority sublattice. We observe these states in a microwaverealization of a dimerized Lieb lattice with next-nearest neighbour coupling,and also demonstrate topological mode selection via sublattice-staggeredabsorption.

Partial chiral symmetry-breaking as a route to spectrally isolated topological defect states in two-dimensional artificial materials