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Dynamic Hubbard Model

Phys.Rev.Lett. 87, 206402 (2001).
The Hubbard on-site repulsion $U$ between opposite spin electrons on the same
atomic orbital is widely regarded to be the most important source of electronic
correlation in solids. Here we extend the Hubbard model to account for the fact that
the experimentally measured atomic $U$ is different from the one obtained
by calculation of the atomic Coulomb integral. The resulting model describes
quasiparticles that become increasingly dressed as the number of electrons in the
band increases. Superconductivity can result in this model through quasiparticle
undressing.
Various signatures of this physics in spectroscopies in the normal and
superconducting states are discussed. A novel effect
in the normal state is predicted to be electroluminescence
at the sample-positive counterelectrode boundary.

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