Document Type
Article
Publication Date
2005
Publication Title
Physical Review Letters
DOI
http://dx.doi.org/10.1103/PhysRevLett.95.096401
Abstract
We present a numerical study of the Hubbard-Holstein model in one dimension at half filling, including finite-frequency quantum phonons. At half filling, the effects of the electron-phonon and electron-electron interactions compete with the Holstein phonon coupling acting as an effective negative Hubbard on-site interaction U that promotes on-site electron pairs and a Peierls charge-density wave state. Most previous work on this model has assumed that only Peierls or Mott phases are possible at half filling. However, there has been speculation that a third metallic phase exists between the Peierls and Mott phases. We confirm the intermediate phase, and show that the Luttinger liquid correlation exponent Kρ>1 in this region, indicating dominant superconducting pair correlations. We explore the full phase diagram as a function of Hubbard U, phonon coupling constant, and phonon frequency.
Rights
This article was archived with permission from APS Physics. Article also available from Physical Review Letters.
Recommended Citation
Clay, R. T. and Hardikar, Rahul, "Intermediate Phase of the One Dimensional Half-Filled Hubbard-Holstein Model" Physical Review Letters / (2005): -.
Available at https://digitalcommons.butler.edu/facsch_papers/818
