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    Phase Diagram of the Extended Hubbard Model with Correlated Hopping Interaction

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    A one-dimensional model of interacting electrons with on-site UU, nearest-neighbor VV, and correlated-hopping interaction T∗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 UU and VV, respectively, we identify bond-located ordered phases corresponding to an enhanced Peierls instability in the system for T∗>0T^\ast>0, ∣U−2V∣<8T∗/π|U-2V|<8T^\ast/\pi and to a staggered magnetization located on bonds between sites for T∗<0T^\ast<0, ∣U−2V∣<8∣T∗∣/π|U-2V|<8|T^\ast|/\pi. The general ground state phase diagram including insulating, metallic, and superconducting phases is discussed.Comment: 8 pages, 4 eps-figure
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