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 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.

4 pages, 4 figures

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• Ground-state phase diagram of the one-dimensional half-filled extended Hubbard model
• Comment on ``Ground State Phase Diagram of a Half-Filled One-Dimensional Extended Hubbard Model''
• Reply to the Comment by Sandvik, Sengupta, and Campbell on ``Ground State Phase Diagram of a Half-Filled One-Dimensional Extended Hubbard Model''

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