Intermediate phase of the one dimensional half-filled Hubbard-Holstein model

Details Intermediate phase of the one dimensional half-filled Hubbard-Holstein model Intermediate phase of the one dimensional half-filled Hubbard-Holstein model

2005-05-07

arxiv.org/abs/cond-mat/0505184v2

Phys. Rev. Lett. 95, 096401 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 EPS figures. v2: typos corrected. To appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.95.096401

We present a detailed numerical study of the Hubbard-Holstein model in one dimension at half filling, including full 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 onsite 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 U>0 Mott insulator phases are possible at half filling. However, there has been speculation that a third metallic phase exists between the Peierls and Mott phases. We present results confirming the intermediate metallic phase, and show that the Luttinger liquid correlation exponent K_rho>1 in this region, indicating dominant superconducting pair correlations. We explore the full phase diagram as a function of onsite Hubbard U, phonon coupling constant, and phonon frequency.

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