Coexisting orders in the quarter-filled Hubbard chain with elastic deformations

TL;DR

This paper theoretically investigates the electronic phases of a quarter-filled extended Peierls-Holstein-Hubbard model with lattice distortions, revealing diverse charge-elastic phases and the significant impact of Peierls deformation on the phase diagram.

Contribution

It introduces a comprehensive analysis of charge-elastic phases considering lattice distortions and Coulomb interactions, including the effect of Peierls deformation on the phase diagram.

Findings

Multiple charge-elastic phases depending on Peierls and Holstein couplings

Phase diagram significantly altered by Peierls deformation in large V regime

Inclusion of lattice distortions affects electronic properties in the model

Abstract

The electronic properties of the quarter-filled extended Peierls-Holstein-Hubbard model that includes lattice distortions and molecular deformations are investigated theoretically using the bosonization approach. We predict the existence of a wide variety of charge-elastic phases depending of the values of the Peierls and Holstein couplings. We include the effect of the Peierls deformation in the nearest-neighbor repulsion V, that may be present in real materials where Coulomb interactions depend strongly on the distance, and we show that the phase diagram changes substantially for large V when this term is taken into account.