Plasmons in three-dimensional superconductors

@article{Repplinger2022PlasmonsIT,
  title={Plasmons in three-dimensional superconductors},
  author={T. Repplinger and S. N. Klimin and M. G{\'e}l{\'e}dan and Jacques Tempere and Hadrien Kurkjian},
  journal={Physical Review B},
  year={2022}
}
We study the plasma branch of an homogeneous three-dimensional electron gas in an s -wave superconducting state. We focus on the regime where the plasma frequency ω p is comparable to the gap ∆ , which is experimentally realized in cuprates. Although a sum rule guarantees that the departure of the plasma branch always coincides with the plasma frequency, the dispersion and lifetime of the plasmons is strongly affected by the presence of the pair condensate, especially at energies close to the… 

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