Quantum superposition demonstrated higher-order topological bound states in the continuum.

ABSTRACT: Higher-order topological insulators, as newly found non-trivial materials and structures, possess topological phases beyond the conventional bulk-boundary correspondence. In previous studies, in-gap boundary states such as the corner states were regarded as conclusive evidence for the emergence of higher-order topological insulators. Here, we present an experimental observation of a photonic higher-order topological insulator with corner states embedded into the bulk spectrum, denoted as the higher-order topological bound states in the continuum. Especially, we propose and experimentally demonstrate a new way to identify topological corner states by exciting them separately from the bulk states with photonic quantum superposition states. Our results extend the topological bound states in t

SUBMITTER: Wang Y 

PROVIDER: S-EPMC8405621 | biostudies-literature | 2021 Aug

REPOSITORIES: biostudies-literature