Superlight inverse Doppler effect

@article{Shi2018SuperlightID,
  title={Superlight inverse Doppler effect},
  author={Xihang Shi and Xiao-guang Lin and Ido Kaminer and Fei Gao and Zhaoju Yang and John D. Joannopoulos and Marin Solja{\vc}i{\'c} and Baile Zhang},
  journal={Nature Physics},
  year={2018},
  volume={14},
  pages={1001-1005}
}
It has long been thought1 that the inverse Doppler frequency shift of light2–13 is impossible in homogeneous systems with a positive refractive index. Here we break this long-held tenet by predicting a previously unconsidered Doppler effect of light inside a radiation cone, the so-called Vavilov–Cherenkov cone, under specific circumstances. It has been known from the classic work of Ginzburg and Frank that a superlight (that is, superluminal) normal Doppler effect14–18 appears inside the… Expand
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