Ground-state phase diagram of a half-filled one-dimensional extended Hubbard model

Details Ground-state phase diagram of a half-filled one-dimensional extended Hubbard model Ground-state phase diagram of a half-filled one-dimensional extended Hubbard model

2002-04-11

arxiv.org/abs/cond-mat/0204244v2

Phys. Rev. Lett. 89, 236401 (2002).

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages (REVTEX 4), 3 EPS figures, shorter abstract, text and references modified

Scientific paper

10.1103/PhysRevLett.89.236401

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 equal to 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 = 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 < U < 7-8 t.

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