Ground-state phase diagram of a half-filled one-dimensional extended hubbard model |
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Authors: | Jeckelmann Eric |
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Institution: | Fachbereich Physik, Philipps-Universit?t, D-35032 Marburg, Germany. |
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Abstract: | The density-matrix renormalization group is used to study the phase diagram of the one-dimensional half-filled Hubbard model with on-site (U) and nearest-neighbor (V) repulsion and hopping t. A critical line V(c)(U) approximately U/2 separates a Mott insulating phase from a charge-density-wave phase. The formation of bound charge excitations for V>2t changes the phase transition from continuous to first-order at a tricritical point U(t) approximately 3.7t, V(t)=2t. A frustrating effective antiferromagnetic spin coupling induces a bond-order-wave phase on the critical line V(c)(U) for U(t)
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