Double-$Q$ Chiral Stripe in the $d$-$p$ Model with Strong Spin-Charge Coupling

TL;DR

This paper demonstrates that a double-$Q$ chiral stripe state remains the ground state in a $d$-$p$ electron system with strong spin-charge coupling, extended by antiferromagnetic interactions, using variational calculations.

Contribution

It reveals the stability of the double-$Q$ chiral stripe state in strong spin-charge coupling regimes considering $d$-$p$ hybridization and superexchange interactions.

Findings

Double-$Q$ state is the ground state even in strong coupling.

The stability region of the double-$Q$ state is extended with antiferromagnetic interactions.

The double-$Q$ state features a scalar chirality density wave.

Abstract

We investigate the stability of multiple-$Q$ spiral states in $d$-$p$ electron systems with the strong spin-charge coupling. By using variational calculations on a square lattice, we find that the double-$Q$ state with the scalar chirality density wave, which has been studied in the weak spin-charge coupling regime, becomes the ground state even in the strong spin-charge coupling regime by considering the effect of the $d$-$p$ hybridization. We also show that the regions where the double-$Q$ state is stabilized are widely extended for introducing the antiferromagnetic superexchange interaction between nearest-neighbor localized spins.