Photonic realization of chiral hinge states in a Chern-insulator stack
arxiv(2024)
摘要
Higher-order topological insulators, as a novel family of topological phases,
are a hot frontier in condensed matter physics due to their adherence to
unconventional bulk-boundary correspondence. A three-dimensional second-order
topological insulator can support one-dimensional modes along its hinges
(dubbed as hinge states). Here, we present a simple and direct method to
construct chiral hinge modes based on a Chern-insulator stack. We analyze the
existence of the hinge modes through the nontrivial quadrupole indices, and
then design a photonic crystal to realize the specific flowing pattern of the
hinge mode in our model. The experimental results align well with full-wave
simulations, clearly demonstrating the existence of chiral hinge states. We
also verify the robustness of these hinge states against defects in our
photonic system.
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