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
【 授权许可】
Free