Optical response of the Leggett mode in multiband superconductors in the linear response regime

@article{Kamatani2022OpticalRO,
  title={Optical response of the Leggett mode in multiband superconductors in the linear response regime},
  author={Takumi Kamatani and Sota Kitamura and Naoto Tsuji and Ryo Shimano and Takahiro Morimoto},
  journal={Physical Review B},
  year={2022}
}
We study optical responses of Leggett modes in multiband superconductors in the linear response regime. The Leggett mode is a collective mode unique to multiband superconductors that arises from relative phase fluctuations of superconducting orders for different bands. We use the Ginzburg-Landau (GL) description to study the collective modes in multiband systems. We find that multiband superconductors generally allow a linear coupling between the Leggett mode and external electric fields due to the… 
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