Effects of dimerization on spin, charge and hopping correlation functions in quasi-one-dimensional organic conductors

In order to see the effects of dimerization, interchain hopping, and neares t-neighbor repulsion on various one- and two-body correlation functions in quasi-one-dimensional organic conductors, (TMTTF)(2)X and (TMTSF)(2)X, we a pply the density matrix renormalization group method to a three-chain exten ded Hubbard model at quarter filling. The hopping correlation function show s that the interchain one-particle coherence is strongly suppressed when a charge gap due to the dimerization is larger than the interchain hopping in tegral. Meanwhile, the spin-spin and charge-charge correlation functions sh ow that the interchain particle-hole coherence is rather insensitive. The c harge-charge correlation function is more sensitive to the nearest-neighbor repulsion than the charge gap. (C) 2000 Elsevier Science B.V. All rights r eserved.