ℏω versus ℏk: Dispersion and Energy Constraints on Time-Varying Photonic Materials and Time Crystals

@article{Hayran2022V,
  title={ℏ$\omega$ versus ℏk: Dispersion and Energy Constraints on Time-Varying Photonic Materials and Time Crystals},
  author={Zeki Hayran and Jacob B. Khurgin and Francesco Monticone},
  journal={Optical Materials Express},
  year={2022}
}
Photonic time-varying systems have attracted significant attention owing to their rich physics and potential opportunities for new and enhanced functionalities. In this context, the duality of space and time in wave physics has been particularly fruitful to uncover interesting physical effects in the temporal domain, such as reflection/refraction at temporal interfaces and momentum-bandgaps in time crystals. However, the characteristics of the temporal/frequency dimension, particularly its… 

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