准一维强关联模型的电子结构

从一维t-J模型出发，应用电荷自由度和自旋自由度相分离的费密子-自旋理论，研究了电子谱函数、准粒子色散关系和态密度，并着重讨论了空穴掺杂铜氧化物电子谱中低能准粒子峰的行为.结果表明，电子谱函数中的低能峰在所有动量点上都十分明显，随动量改变，峰的位置也发生改变，产生了随动量的色散，形成的能带的带宽能量尺度由磁相互作用的量级J来控制；在准一维强关联模型中也存在绝缘体-金属转变，随着掺杂的增加，化学势逐渐向下Hubbard带上端移动，输运性质增强；电子谱和准粒子色散的反常行为源于系统中存在的强关联相互作用，是电荷自由度和自旋自由度相分离的自然结果.

Electronic Structure of Strongly Correlated Model in Quasi One Dimension

Starting from the t J model in one dimension， the electron spectral function， dispersion relationship of the quasiparticles and the density of states were studied with the charge spin separation Fermion spin theory， and the behavior of the low energy quasiparticle peak in the hole doped cuprates were discussed in detail. The results showed that the low energy peaks in electron spectral function were well defined at all momenta， and the position of the peaks changed with the changes of the momenta and produced the dispersion with the momenta. The bandwidth energy scale of the energy band was controlled by the order of the magnetic interaction J. There also existed insulator metal transition in quasi one dimension strong correlated models， the chemical potential moved to the top edge of the lower Hubbard band and the charge transport property increased with the increase of the hole doping. The unusual behavior of the electron spectrum and quasiparticle dispersion was related to the strong correlated interaction in the system and was the natural result of charge spin separation.