Determining the underlying Fermi surface of strongly correlated superconductors

Details Determining the underlying Fermi surface of strongly correlated superconductors Determining the underlying Fermi surface of strongly correlated superconductors

2006-06-29

arxiv.org/abs/cond-mat/0606750v1

PNAS 103, 14298-14301 (2006)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1073/pnas.0606219103

The notion of a Fermi surface (FS) is one of the most ingenious concepts developed by solid state physicists during the past century. It plays a central role in our understanding of interacting electron systems. Extraordinary efforts have been undertaken, both by experiment and by theory, to reveal the FS of the high temperature superconductors (HTSC), the most prominent strongly correlated superconductors. Here, we discuss some of the prevalent methods used to determine the FS and show that they lead generally to erroneous results close to half filling and at low temperatures, due to the large superconducting gap (pseudogap) below (above) the superconducting transition temperature. Our findings provide a perspective on the interplay between strong correlations and superconductivity and highlight the importance of strong coupling theories for the characterization as well as the determination of the underlying FS in ARPES experiments.

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