Phys. Rev. Lett. 89, 236401 (2002) [4 pages]Ground-State Phase Diagram of a Half-Filled One-Dimensional Extended Hubbard ModelReceived 10 April 2002; published 15 November 2002 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 Vc(U)≈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 Ut≈3.7t, Vt=2t. A frustrating effective antiferromagnetic spin coupling induces a bond-order-wave phase on the critical line Vc(U) for Ut<U≲7t. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.236401
DOI:
10.1103/PhysRevLett.89.236401
PACS:
71.10.Fd, 71.10.Hf, 71.10.Pm, 71.30.+h
See AlsoReply: Anders W. Sandvik, Pinaki Sengupta, and David K. Campbell, Comment on “Ground-State Phase Diagram of a Half-Filled One-Dimensional Extended Hubbard Model”, Phys. Rev. Lett. 91, 089701 (2003). Reply: Eric Jeckelmann, Jeckelmann Replies:, Phys. Rev. Lett. 91, 089702 (2003). |
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