Phase Diagram of the Extended Hubbard Model with Correlated Hopping Interaction

Details Phase Diagram of the Extended Hubbard Model with Correlated Hopping Interaction Phase Diagram of the Extended Hubbard Model with Correlated Hopping Interaction

1998-08-24

arxiv.org/abs/cond-mat/9808253v1

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 4 eps-figures

Scientific paper

10.1103/PhysRevB.59.12822

A one-dimensional model of interacting electrons with on-site $U$, nearest-neighbor $V$, and correlated-hopping interaction $T^{\ast}$ is studied at half-filling using the continuum-limit field theory approach. The ground state phase diagram is obtained for a wide range of coupling constants. In addition to the insulating spin- and charge-density wave phases for large $U$ and $V$, respectively, we identify bond-located ordered phases corresponding to an enhanced Peierls instability in the system for $T^\ast>0$, $|U-2V|<8T^\ast/\pi$ and to a staggered magnetization located on bonds between sites for $T^\ast<0$, $|U-2V|<8|T^\ast|/\pi$. The general ground state phase diagram including insulating, metallic, and superconducting phases is discussed.

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