Ground state phases of the Half-Filled One-Dimensional Extended Hubbard Model

Details Ground state phases of the Half-Filled One-Dimensional Extended Hubbard Model Ground state phases of the Half-Filled One-Dimensional Extended Hubbard Model

2004-01-23

arxiv.org/abs/cond-mat/0401472v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.92.236401

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 appr. V/2 up to U/t appr. 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 up to appr. 5.5 and first-order for higher U.

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