Dimerization in a half-filled one-dimensional extended Hubbard model

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We use a density matrix renormalization group method to study quantitatively the phase diagram of a one-dimensional extended Hubbard model at half-filling by investigating the correlation functions and structure factors. We confirm the existence of a novel narrow region with long-rang bond-order-wave order which is highly controversial recently between the charge-density-wave phase and Mott insulator phase. We determined accurately the position of the tricritical point Uₜ≃ 7.2t, Vₜ≃ 3.746t which is quite different from previous studies.