期刊论文详细信息
Possible charge instabilities in two-dimensional doped Mott insulators
Article
关键词: T-J MODEL;    DIMENSIONAL FERMI-SURFACE;    LARGE-N LIMIT;    PHASE-SEPARATION;    PSEUDOGAP STATE;    SYMMETRY-BREAKING;    FLUX PHASE;    TEMPERATURE;    SUPERCONDUCTIVITY;    STRIPES;   
DOI  :  10.1103/PhysRevB.86.224509
来源: SCIE
【 摘 要 】

Motivated by the growing evidence of the importance of charge fluctuations in the pseudogap phase in high-temperature cuprate superconductors, we apply a large-N expansion formulated in a path integral representation of the two-dimensional t - J model on a square lattice. We study all possible charge instabilities of the paramagnetic state in leading order of the 1/N expansion. While the d-wave charge density wave (flux phase) becomes the leading instability for various choices of model parameters, we find that a d-wave Pomeranchuk (electronic nematic phase) instability occurs as a next leading one. In particular, the nematic state has a strong tendency to become inhomogeneous. In the presence of a large second nearest-neighbor hopping integral, the flux phase is suppressed and the electronic nematic instability becomes leading in a high doping region. Besides these two major instabilities, bond-order phases occur as weaker instabilities close to half-filling. Phase separation is also detected in a finite temperature region near half-filling. DOI: 10.1103/PhysRevB.86.224509

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