Exotic quantum light-matter interactions in bilayer square lattices
arXiv:2509.09217 · doi:10.1103/PhysRevB.108.045407
Abstract
We investigate quantum emitters (QEs) interacting with a photonic structured bath made of bilayer square lattices, where the resonance anti-crossing between the energy bands opens a symmetric middle energy gap. Due to the intrinsic chiral symmetry of the bath and interactions with the square-like band-edges, the QE-photon dressed states generated in this inner bandgap are odd-neighbor, robust, and anisotropic, when the emitters' transition frequencies lie in the middle of the bandgap. We also use giant artificial atoms to engineer and modify the dressed states' patterns. Exotic bound states can lead to spin models with symmetry protection, resulting in fascinating many-body phases. As an example, we show that this proposal can be used to generate both edge states and corner states in the generalized 2D Su-Schrieffer-Heeger (SSH) model. This work opens up new avenues for research into innovative quantum many-body physics and quantum simulations with photonic or phononic multilayer structures.
12 pages, 7 figures
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