Observation of a localized flat-band state in a photonic Lieb lattice

Abstract

We show experimentally how a non-diffracting state can be excited in a photonic Lieb lattice. This lattice supports three energy bands, including a perfectly flat middle band, which corresponds to an infinite effective mass with zero dispersion. We show that a suitable optical input state can be prepared so as to only excite the flat band. We analyse, both experimentally and theoretically, the evolution of such photonic flat-band states, and show their remarkable robustness, even in the presence of disorder.

Accepted for publication in Physical Review Letters

References in corpus (8)

• Many-Body Physics with Ultracold Gases
• Quantum fluids of light
• Direct observation of Anderson localization of matter-waves in a controlled disorder
• Observation of bound states in Lieb photonic lattices
• Flat bands and Wigner crystallization in the honeycomb optical lattice
• Topological Phases for Fermionic Cold Atoms on the Lieb Lattice
• Flat Bands Under Correlated Perturbations
• Fractional Quantum Hall States of Rydberg Polaritons

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