Non-dispersive Fermi arcs and absence of charge ordering in the pseudogap phase of Bi2Sr2CaCu2O8+d

TL;DR

This study shows that in the pseudogap phase of Bi2Sr2CaCu2O8+d, the non-dispersive peaks in autocorrelation are due to Fermi arc tips and not charge ordering, contrasting with dispersive behavior in the superconducting state.

Contribution

It clarifies that non-dispersive autocorrelation peaks are caused by Fermi arc tips, not charge order, providing insight into pseudogap phase electronic structure.

Findings

Non-dispersive peaks originate from Fermi arc tips.

Dispersive peaks are observed in the superconducting state.

No evidence of charge ordering in the pseudogap phase.

Abstract

The autocorrelation of angle resolved photoemission data from the high temperature superconductor Bi2Sr2CaCu2O8+d shows distinct peaks in momentum space which disperse with binding energy in the superconducting state, but not in the pseudogap phase. Although it is tempting to attribute a non-dispersive behavior in momentum space to some ordering phenomenon, a de-construction of the autocorrelation reveals that the non-dispersive peaks arise not from ordering, but rather from the tips of the Fermi arcs, which themselves do not change with binding energy.