title: Ground state phases of the half-filled one-dimensional extended hubbard model.
abstract: Using quantum Monte Carlo simulations, results of a strong-coupling expansion, and Luttinger liquid theory, we determine quantitatively the ground state phase diagram of the one-dimensional extended Hubbard model with on-site and nearest-neighbor repulsions U and V. We show that spin frustration stabilizes a bond-ordered (dimerized) state for U approximately V/2 up to U/t approximately 9, where t is the nearest-neighbor hopping. The transition from the dimerized state to the staggered charge-density-wave state for large V/U is continuous for U < or approximately 5.5 and first order for higher U.
authors.affiliation: Department of Physics, Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215, USA.
authors.forename: Anders W
authors.initials: AW
authors.lastname: Sandvik
authors.forename: Leon
authors.initials: L
authors.lastname: Balents
authors.forename: David K
authors.initials: DK
authors.lastname: Campbell