Broad line-width of antiferromagnetic spinwave due to electrons correlation

TL;DR

This paper investigates how electron correlations in a bilayer system cause broadening of antiferromagnetic spin waves, revealing that increased correlations lead to wider linewidths due to particle-hole excitations.

Contribution

It introduces a theoretical framework combining the AF insulator and correlated metal, showing how electron correlation enhances spin wave linewidths via particle-hole excitations.

Findings

Linewidth increases inversely with the Gutzwiller factor g_t.

Electron correlation significantly broadens the AF spin wave spectrum.

Results applicable to metal-ferrimagnet bilayers.

Abstract

We study magnetic excitations in a bilayer of an antiferromagnetic (AF) insulator and a correlated metal, in which double occupancy is forbidden. The effective action of the AF spin wave in the AF insulator is derived by using the path integral formula within the second order of interplane coupling. The electron correlation in the correlated metal is treated by the Gutzwiller approximation, which renormalizes the hopping integrals by g_t as proportional to the hole density. The linewidth of the AF spin wave excitations originates from particle-hole excitations in the correlated metal. By increasing the correlation effect, i.e., by decreasing g_t, it is found that the linewidth at low energies increases inversely proportional to g_t. The present results will also be useful for bilayers of a metal and ferrimagnet.