Soliton-Like Excitations and Electronic Structure in Quasi One-Dimensional Conductors. I. Formulation

抄録

Soliton-like excitations which preserve the charge neutrality are investigated with the model based on the pseudopotential theory. Two types of excitations are investigated: the one that has the band gap above the Fermi level and the other that is a kind of the bound state of soliton and antisoliton and all states below the gap are occupied. These solitons are taken as metastable states that satisfy the stability condition and variations of electronic band structure in the soliton region are fully taken into account. The numerical calculations are performed in the succeeding paper.