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Abstract:
The electronic properties of correlated metals with a strong electron-phonon coupling may be
understood in terms of a combination of Landau's Fermi-liquid theory and the strong-coupling
theory of Migdal and Eliashberg. In these lecture notes we discuss the
microscopic foundations of this phenomenological Fermi-liquid model of
correlated, strong-coupling metals. We formulate the basic equations of
the model, which are quasiclassical transport equations that describe both
equilibrium and non-equilibrium phenomena for the normal and superconducting
states of a metal. Our emphasis is on superconductors close to equilibrium,
for which we derive the general linear response theory. As an application
we calculate the dynamical conductivity of strong-coupling superconductors.
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