Nature Communications (Feb 2020)

A square-root topological insulator with non-quantized indices realized with photonic Aharonov-Bohm cages

  • Mark Kremer,
  • Ioannis Petrides,
  • Eric Meyer,
  • Matthias Heinrich,
  • Oded Zilberberg,
  • Alexander Szameit

DOI
https://doi.org/10.1038/s41467-020-14692-4
Journal volume & issue
Vol. 11, no. 1
pp. 1 – 6

Abstract

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Topological insulators are characterized by quantized topological invariants. Here, the authors report an insulator state showing spectral bands without quantized indices, yet robust boundary states in a photonic setup.