The one-dimensional t-J model coupled to adiabatic phonons: A numerical investigation
Abstract
The ground state of the one-dimensional t-J model coupled with phonons in the adiabatic limit is numerically investigated by use of the Lanczos technique at quarter filling. Due to the interplay between the electron-electron Coulomb repulsion and electron-phonon interaction, this model shows a sequence of lattice distortions leading to the formation of charge-density-waves and bond-order-waves. Moderate electron-electron and electron-lattice coupling may lead to coexistence of dimerization and tetramerization in the distortion pattern. Dimerization leads to the formation of an "antiferromagnetic" Mott insulator, while tetramerization gives rise to a spin-Peierls phase. By increasing the super-exchange coupling, antiferromagnetism is inhibited due to the change of the distortion periodicity.
Cite
@article{arxiv.cond-mat/0409586,
title = {The one-dimensional t-J model coupled to adiabatic phonons: A numerical investigation},
author = {Samuele Bissola and Alberto Parola},
journal= {arXiv preprint arXiv:cond-mat/0409586},
year = {2009}
}