Nonreciprocal Single-Photon Band Structure.

  title={Nonreciprocal Single-Photon Band Structure.},
  author={Jiangshan Tang and Wei Nie and Lei Tang and Mingyuan Chen and Xin Su and Yanqing Lu and Franco Nori and Keyu Xia},
  journal={Physical review letters},
  volume={128 20},
We study a single-photon band structure in a one-dimensional coupled-resonator optical waveguide that chirally couples to an array of two-level quantum emitters (QEs). The chiral interaction between the resonator mode and the QE can break the time-reversal symmetry without the magneto-optical effect and an external or synthetic magnetic field. As a result, nonreciprocal single-photon edge states, band gaps, and flat bands appear. By using such a chiral QE coupled-resonator optical waveguide… 

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