Optical absorption in the strong coupling limit of Eliashberg theory

Details Optical absorption in the strong coupling limit of Eliashberg theory Optical absorption in the strong coupling limit of Eliashberg theory

1995-09-12

arxiv.org/abs/cond-mat/9509065v1

Physics

Condensed Matter

10 pages, revtex, 4 uuencoded figures

Scientific paper

10.1103/PhysRevB.53.2739

We calculate the optical conductivity of superconductors in the strong-coupling limit. In this anomalous limit the typical energy scale is set by the coupling energy, and other energy scales such as the energy of the bosons mediating the attraction are negligibly small. We find a universal frequency dependence of the optical absorption which is dominated by bound states and differs significantly from the weak coupling results. A comparison with absorption spectra of superconductors with enhanced electron-phonon coupling shows that typical features of the strong-coupling limit are already present at intermediate coupling.

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