Insulator-to-metal Transition Driven By Clustering Of Solitons In Polyacetylene

It's believed that the simple Su-Schrieffer-Heeger Hamiltonian can not predict the insulator to metal transition of transpolyacetylene (t-PA). The soliton lattice configuration at a doping level y=6% still has a semiconductor gap. Disordered distributions of solitons close the gap, but the electronic states around the Fermi energy are localized. However, within the same framework, it is possible to show that a cluster of solitons can produce dramatic changes in the electronic structure, allowing an insulator-to-metal transition.8501/03/1510831084Su, W.P., Schrieffer, J.R., Heeger, A.J., (1980) Phys. Rev., B22, p. 5754Rice, M.J., Mele, E.J., (1981) Phys. Rev., B23, p. 5397Su, W.P., (1983) Sol. St. Comm., 47, p. 947Conwell, E.M., Mizes, H.A., (1989) S. Jeyadev, Phys. Rev., B40, p. 1630Stafström, S., (1991) Phys. Rev., B43, p. 9158Cohen, R.J., Glick, A.J., (1992) Phys. Rev. B, 45, p. 310