Electronic Raman response in electron-doped cuprate superconductors

TL;DR

This paper investigates the electronic Raman response in electron-doped cuprate superconductors using the $t$-$t'$-$J$ model, revealing deviations from hole-doped behavior due to a nonmonotonic d-wave gap.

Contribution

It provides a theoretical analysis of Raman response in electron-doped cuprates, highlighting the effects of a nonmonotonic d-wave gap on low-energy responses.

Findings

Dome-shaped doping dependence of peak energy in $B_{2g}$ symmetry.

Pronounced deviations in $B_{1g}$ and $B_{2g}$ channels at low energy.

Nonmonotonic d-wave gap causes these deviations.

Abstract

The electronic Raman response in the electron-doped cuprate superconductors is studied based on the $t$-$t'$-$J$ model. It is shown that although the domelike shape of the doping dependent peak energy in the $B_{2g}$ symmetry is a common feature for both electron-doped and hole-doped cuprate superconductors, there are pronounced deviations from a cubic response in the $B_{1g}$ channel and a linear response in the $B_{2g}$ channel for the electron-doped case in the low energy limit. It is also shown that these pronounced deviations are mainly caused by a nonmonotonic d-wave gap in the electron-doped cuprate superconductors.