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.
Keywords
Cite
@article{arxiv.1603.01157,
title = {Unconventional superconductivity and interaction induced Fermi surface reconstruction in the two-dimensional Edwards model},
author = {Dai-Ning Cho and Jeroen van den Brink and Holger Fehske and Klaus W. Becker and Steffen Sykora},
journal= {arXiv preprint arXiv:1603.01157},
year = {2016}
}
Comments
13 pages, 2 figures