Journal
2D MATERIALS
Volume 4, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2053-1583/aa56de
Keywords
defect states; topological materials; symmetries; mode selection; flat bands; Lieb lattice; Dirac points
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Funding
- EPSRC [EP/J019585/1, EP/N031776/1]
- EPSRC [EP/J019585/1, EP/N031776/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/J019585/1] Funding Source: researchfish
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Bipartite quantum systems from the chiral universality classes admit topologically protected zero modes at point defects. However, in two-dimensional systems these states can be difficult to separate from compacton-like localized states that arise from flat bands, formed if the two sublattices support a different number of sites within a unit cell. Here we identify a natural reduction of chiral symmetry, obtained by coupling sites on the majority sublattice, which gives rise to spectrally isolated point-defect states, topologically characterized as zero modes supported by the complementary minority sublattice. We observe these states in a microwave realization of a dimerized Lieb lattice with next-nearest neighbour coupling, and also demonstrate topological mode selection via sublattice-staggered absorption.
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