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Retardation effects and the Coulomb pseudopotential in the theory of superconductivity
Johannes Bauer, Jong E. Han, Olle Gunnarsson
In the theory of electron-phonon superconductivity both the magnitude of the electron-phonon coupling as well as the Coulomb pseudopotential are important to determine th…
Strongly correlated electrons: Estimates of model parameters
Olle Gunnarsson
The determination of renormalized parameters in model Hamiltonians is discussed. A simple model of a 3d compound is studied, and it is shown how higher states can be projected out,…
Pseudogap in cuprate and organic superconductors
J. Merino, O. Gunnarsson
We study the pseudogap present in cuprate and organic superconductors. We use the dynamical cluster approximation (DCA), treating a cluster embedded in a bath. As the Coulomb inter…
Theory of electron-phonon superconductivity: Does retardation really lead to a small Coulomb pseudopotential?
Johannes Bauer, Jong E. Han, Olle Gunnarsson
The theory of electron-phonon superconductivity depends on retardation drastically reducing effects of the strong Coulomb repulsion. The standard theory only treats the lowest orde…