一维交替在位作用(t-U-X)模型的基态相图

Phase Diagram of the One-Dimensional t-U-X Model with Different Hubbard Interactions

在弱耦合条件下,我们研究了奇(Uo)、偶(Ue)晶格上不相等Hubbard相互作用的一维非常规t-U-X模型的量子特质。在四分之一填充时,在 的情况下,不相等的在位排斥相互作用导致umklapp过程的发生。玻色化和重整化群分析有助于获得基态相图,包括一个单相超导序的金属相和分别具有自旋密度波和电荷密度波的二个绝缘相。

At weak coupling, we examine quantum properties of the one-dimensional unconventional t-U-X model with unequal Hubbard interaction at even (Ue) and odd (Uo) lattices. At quarter filling, the unequal on-site repulsive interactions have a key effect that leads to the occurrence of umklapp processes in the case of . The bosonization and renormalization-group analysis helps get the ground-state phase diagram, which includes a metallic phase with the singlet superconductivity instability and two insulating with the spin- and charge-density-wave instabili-ties.