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 correloted-hopping interaction T* is studied at half filling using the continuum-limit field theory approach. The groundstate 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*/pi and to a staggered magnetization located an bonds between sites for T*<0, \U-2V\<8\T*\/pi. The general ground-state phase diagram including insulating, metallic, and superconducting phases is discussed. [S0163-1829(99)07119-2].