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Realization of a Non-Quantized Square-Root Topological Insulator Based on Photonic Aharonov-Bohm Cages

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Abstract

We report a new type of insulator that exhibits spectral bands with non-quantized topological properties. Furthermore, a quantisation manifests itself upon squaring the Hamiltonian. We experimentally verify our claims by using photonic Aharonov-Bohm cages.

© 2019 The Author(s)

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