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- W3216161239 abstract "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 presence of a cross term between different components of superconducting orders in the GL theory. The presence of a linear coupling for the Leggett mode is in sharp contrast with the absence of that for Higgs (amplitude) modes in single-band superconductors that only support nonlinear optical responses such as third harmonic generation (THG). We further confirm such a linear coupling in multiband superconductors by a more microscopic description based on a diagrammatic approach. We study the collective modes within the random phase approximation (RPA) and compute their contribution to the linear optical conductivity. These findings suggest a new route to observe the Leggett mode by optical absorption." @default.
- W3216161239 created "2021-12-06" @default.
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- W3216161239 date "2022-03-30" @default.
- W3216161239 modified "2023-10-15" @default.
- W3216161239 title "Optical response of the Leggett mode in multiband superconductors in the linear response regime" @default.
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- W3216161239 doi "https://doi.org/10.1103/physrevb.105.094520" @default.
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