Topological photonic states in one-dimensional dimerized ultracold atomic chains

@article{Wang2018TopologicalPS,
  title={Topological photonic states in one-dimensional dimerized ultracold atomic chains},
  author={B. Wang and C. Y. Zhao},
  journal={Physical Review A},
  year={2018},
  volume={98},
  pages={023808}
}
We study the topological optical states in one-dimensional (1D) dimerized ultracold atomic chains, as an extension of the Su-Schrieffer-Heeger (SSH) model. By taking the fully retarded near-field and far-field dipole-dipole interactions into account, we describe the system by an effective non-Hermitian Hamiltonian, vastly different from the Hermitian Hamiltonian of the conventional SSH model. We analytically calculate the complex bandstructures for infinitely long chains, and show that the… 

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