Negative refractive index in cubic noncentrosymmetric superconductors

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We study the negative refractive index in cubic noncentrosymmetric superconductors.We consider the Maxwell equations under the Meissner effect, and the magnetoelectric effect arising due to inversion-symmetry breaking. We derive the dispersion relations of electromagnetic waves and show that the refractive index becomes negative at frequencies just below the plasma gap. We find that the chiral mechanism of the negative refractive index, which is usually discussed in chiral materials with negative permittivity, can be directly applied to noncentrosymmetric superconductors with positive permittivity. A rough estimation from experimental values of the penetration depth of LiPt3B indicates that a negative refractive index may appear in UV regions.

Original languageEnglish
Article number033B03
JournalProgress of Theoretical and Experimental Physics
Issue number3
Publication statusPublished - 2019 Mar 17
Externally publishedYes


  • I61

ASJC Scopus subject areas

  • General Physics and Astronomy


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