Study of the ionic Peierls-Hubbard model using density matrix renormalization group methods
Strongly Correlated Electrons
2009-11-10 v2
Abstract
Density matrix renormalization group methods are used to investigate the quantum phase diagram of a one-dimensional half-filled ionic Hubbard model with bond-charge attraction, which can be mapped from the Su-Schrieffer-Heeger-type electron-phonon coupling at the antiadiabatic limit. A bond order wave (dimerized) phase which separates the band insulator from the Mott insulator always exists as long as electron-phonon coupling is present. This is qualitatively different from that at the adiabatic limit. Our results indicate that electron-electron interaction, ionic potential and quantum phonon fluctuations combine in the formation of the bond-order wave phase.
Cite
@article{arxiv.cond-mat/0401535,
title = {Study of the ionic Peierls-Hubbard model using density matrix renormalization group methods},
author = {Y. Z. Zhang and C. Q. Wu and H. Q. Lin},
journal= {arXiv preprint arXiv:cond-mat/0401535},
year = {2009}
}