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

Sebabrata Mukherjee, Alexander Spracklen, Debaditya Choudhury, Nathan Goldman, Patrik Ohberg, Erika Andersson, Robert R. Thomson

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We demonstrate the first experimental realization of a dispersionless state, in a photonic Lieb lattice formed by an array of optical waveguides. This engineered lattice supports three energy bands, including a perfectly flat middle band with an infinite effective mass. We analyze, both experimentally and theoretically, the evolution of well-prepared flat-band states, and show their remarkable robustness, even in the presence of disorder. The realization of flat-band states in photonic lattices opens an exciting door towards quantum simulation of flat-band models in a highly controllable environment
Original languageEnglish
Article number245504
JournalPhysical Review Letters
Issue number24
Publication statusPublished - 19 Jun 2015


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