title: Effect of electron-phonon interaction range for a half-filled band in one dimension.
abstract: We demonstrate that fermion-boson models with nonlocal interactions can be simulated at finite band filling with the continuous-time quantum Monte Carlo method. We apply this method to explore the influence of the electron-phonon interaction range for a half-filled band in one dimension, covering the full range from the Holstein to the Fröhlich regime. The phase diagram contains metallic, Peierls, and phase-separated regions. Nonlocal interactions suppress the Peierls instability, and thereby lead to almost degenerate power-law exponents for charge and pairing correlations.
authors.affiliation: Institut für Theoretische Physik und Astrophysik, Universität Würzburg, 97074 Würzburg, Germany.
authors.forename: Martin
authors.initials: M
authors.lastname: Hohenadler
authors.forename: Fakher F
authors.initials: FF
authors.lastname: Assaad
authors.forename: Holger
authors.initials: H
authors.lastname: Fehske