Quasiparticle interference and charge order in a heavily overdoped non-superconducting cuprate

TL;DR

This study uses scanning tunneling microscopy to explore the electronic structure of heavily overdoped, non-superconducting cuprates, revealing quasiparticle interference and static charge order, shedding light on the normal state of high-Tc superconductors.

Contribution

It provides the first detailed observation of quasiparticle interference and static charge order in heavily overdoped, non-superconducting cuprates, linking experimental findings with theoretical models.

Findings

Dispersive quasiparticle interference observed

Nanoscale static charge order with sqrt(2)*sqrt(2) periodicity detected

Electronic structure explained by theoretical calculations

Abstract

One of the key issues in unraveling the mystery of high Tc superconductivity in the cuprates is to understand the normal state outside the superconducting dome. Here we perform scanning tunneling microscopy and spectroscopy measurements on a heavily overdoped, non-superconducting (Bi,Pb)2Sr2CuO6+x cuprate. Spectroscopic imaging reveals dispersive quasiparticle interferences and the Fourier transforms uncover the evolution of momentum space topology. More interestingly, we observe nanoscale patches of static charge order with sqrt(2)*sqrt(2) periodicity. Both the dispersive quasiparticle interference and static charge order can be qualitatively explained by theoretical calculations, which reveal the unique electronic structure of strongly overdoped cuprate.