Unconventional superconductivity and interaction induced Fermi surface reconstruction in the two-dimensional Edwards model

Abstract

We study the competition between unconventional superconducting pairing and charge density wave (CDW) formation for the two-dimensional Edwards Hamiltonian at half filling, a very general two-dimensional transport model in which fermionic charge carriers couple to a correlated background medium. Using the projective renormalization method we find that a strong renormalization of the original fermionic band causes a new hole-like Fermi surface to emerge near the center of the Brillouin zone, before it eventually gives rise to the formation of a charge density wave. On the new, disconnected parts of the Fermi surface superconductivity is induced with a sign-changing order parameter. We discuss these findings in the light of recent experiments on iron-based oxypnictide superconductors.

13 pages, 2 figures

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• Edwards polaron formation : From one to three dimension
• Impact ionization dynamics in small band-gap 2D materials from a coherent phonon mechanism
• Optical amplification in a CDW-phase of a quasi-two dimensional material