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Intermediate Phase of the One Dimensional Half-Filled Hubbard-Holstein Model
Physical Review Letters
  • R. T. Clay
  • Rahul Hardikar, Butler University
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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.
This article was archived with permission from APS Physics. Article also available from Physical Review Letters.
Citation Information
R. T. Clay and Rahul Hardikar. "Intermediate Phase of the One Dimensional Half-Filled Hubbard-Holstein Model" Physical Review Letters Vol. 95 (2005)
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