Flat band mediated photon-photon interactions in 2D waveguide QED networks
- URL: http://arxiv.org/abs/2505.10623v2
- Date: Thu, 22 May 2025 14:49:20 GMT
- Title: Flat band mediated photon-photon interactions in 2D waveguide QED networks
- Authors: Matija Tečer, Giuseppe Calajó, Marco Di Liberto,
- Abstract summary: We investigate a Lieb lattice of quantum emitters coupled to a two-dimensional waveguide network.<n>We show that this system supports an energetically isolated flat band, despite the presence of long-range photon-induced couplings.<n>Our findings highlight how the interplay between the collective behavior of emitters and effective photon-photon interactions can provide a platform for studying highly correlated photonic states in flat-band systems.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: We investigate a Lieb lattice of quantum emitters coupled to a two-dimensional waveguide network and demonstrate that this system supports an energetically isolated flat band, enabling localization despite the presence of long-range photon-mediated couplings. We then explore the two-excitation dynamics in both the softcore and hardcore interaction regimes, which arise from the nonlinearity of the emitters. In the softcore regime, we observe interaction-induced photon transport within the flat band, mediated by the formation of bound photon pairs. In the hardcore regime, corresponding to the two-level atom limit, we instead find the emergence of metastable exciton-like dressed states involving both flat and dispersive bands. Our findings highlight how the interplay between the collective behavior of emitters and effective photon-photon interactions can provide a platform for studying highly correlated photonic states in flat-band systems.
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