Spin-charge disparity of polarons in organic ferromagnets

TL;DR

This paper investigates the asymmetric charge distribution and nearly symmetric spin density of polarons in organic ferromagnets, revealing how spin radicals influence polaron properties through mean-field calculations and symmetry considerations.

Contribution

It introduces a detailed analysis of spin-charge disparity in polarons within organic ferromagnets using an extended Su-Schrieffer-Heeger model with a Kondo term.

Findings

Charge distribution is highly asymmetric due to spin radicals

Spin density remains nearly symmetric despite polaron formation

Results are explained through symmetry arguments and mean-field calculations

Abstract

Polaron formation in quasi-one-dimensional organic ferromagnets is studied based on an extended Su-Schrieffer-Heeger model combined with a Kondo term. The charge distribution of the polaron is found to be highly asymmetric under spatial reflection, due to the spin radicals. On the contrary, the spin density is nearly symmetric; the spin asymmetry introduced by the extra electron inducing the polaron formation is nearly compensated by the spin polarization of the lower-energy states. We discuss these results on the basis of real-space mean-field calculations and symmetry arguments.