Commensurate-incommensurate transition in two-coupled chains of nearly half-filled electrons

摘要: We investigate the physical properties of two coupled chains electrons, with a nearly half-filled band, as function interchain hopping t ⊥ and doping. show that upon doping, system undergoes metal-insulator transition well described by commensurate-incommensurate transition. By using bosonization renormalization we determine full phase diagram system, quantities such charge gap. In commensurate different regions, for which is relevant irrelevant exist, leading to confinement-deconfinement crossover in this phase. A minimum gap observed values close crossover. At large region enhanced, compared single chain. Luttinger parameter takes universal value K ρ * = 1, agreement previous results on special limits model.