Raman Response in Doped Antiferromagnets

TL;DR

This study calculates the Raman scattering response in doped antiferromagnets using the $t-J$ model, revealing doping-dependent changes in the two-magnon peak's width and intensity relevant to cuprate experiments.

Contribution

It provides a finite-temperature diagonalization analysis of the Raman response in the $t-J$ model, connecting theoretical predictions with experimental observations in cuprates.

Findings

Doping causes a significant increase in the two-magnon Raman peak width.

Total Raman intensity decreases with doping.

Peak position remains relatively unchanged in the underdoped regime.

Abstract

The resonant part of the $B_{1g}$ electronic Raman scattering response is calculated within the $t-J$ model on a planar lattice as a function of temperature and hole doping, using a finite-temperature diagonalization method for small systems. Results, directly applicable to experiments on cuprates, reveal on doping a very pronounced increase of the width of the two-magnon Raman peak, accompanied by a decrease of the total intensity. At the same time the peak position does not shift substantially in the underdoped regime.