EFFECTIVE PAIRING MODEL FOR A ONE-DIMENSIONAL DIMERIZED SYSTEM

Dimerization in a one-dimensional chain is modeled using an alternatin g potential model. Within the mean field approximation, the present mo del includes an effective pairing contribution between the bonding ele ctrons as well as the Su-Schrieffer-Heeger Hamiltonian. It is shown th at the effective pairing introduces the soliton and the energy pp in t he dimerized one-dimensional system. It is also found that superconduc tivity in the dimerized system is prevented by the energy barrier betw een the two degenerate phases.