Weak-coupling phase diagram of the extended Hubbard model with correlated-hopping interaction

A one-dimensional model of interacting electrons with on-site U, nearest-neighbor V, and correlated-hopping interaction T* 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*>0, |U-2V|<8T*/π and to a staggered magnetization located on bonds between sites for T*<0, |U-2V|<8|T*|/π. The general ground-state phase diagram including insulating, metallic, and superconducting phases is discussed.