Phase Diagram of the Extended Hubbard Model with Pair Hopping Interaction

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

2002-02-24

arxiv.org/abs/cond-mat/0202420v1

Physics

Condensed Matter

6 pages in revtex format, 2 fig files in eps

Scientific paper

10.1140/epjb/e2002-00212-0

A one-dimensional model of interacting electrons with on-site $U$, nearest-neighbor $V$, and pair-hopping interaction $W$ 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 $W<0$, $|U-2V|<|2W|$, and to a staggered magnetization located on bonds between sites for $W>0$, $|U-2V|

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