Phase Diagram of One-Dimensional Extended Hubbard Model at Half Filling

Details Phase Diagram of One-Dimensional Extended Hubbard Model at Half Filling Phase Diagram of One-Dimensional Extended Hubbard Model at Half Filling

2001-09-04

arxiv.org/abs/cond-mat/0109051v1

Phys. Rev. Lett. 88, 056402 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.88.056402

We reexamine the ground-state phase diagram of the one-dimensional half-filled Hubbard model with on-site and nearest-neighbor repulsive interactions. We calculate second-order corrections to coupling constants in the g-ology to show that the bond-charge-density-wave (BCDW) phase exists for weak couplings in between the charge density wave (CDW) and spin density wave (SDW) phases. We find that the umklapp scattering of parallel-spin electrons destabilizes the BCDW state and gives rise to a bicritical point where the CDW-BCDW and SDW-BCDW continuous-transition lines merge into the CDW-SDW first-order transition line.

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