Multiorbital effects in the functional renormalization group: A weak-coupling study of the Emery model | |
Article | |
关键词: MEAN-FIELD THEORY; HUBBARD-MODEL; TRANSITION-TEMPERATURE; SCALING THEORY; GROUP FLOWS; SUPERCONDUCTIVITY; ENERGY; SYSTEMS; PHASE; STATE; | |
DOI : 10.1103/PhysRevB.88.235112 | |
来源: SCIE |
【 摘 要 】
We perform an instability analysis of the Emery three-band model at hole doping and weak coupling within a channel-decomposed functional renormalization group flow proposed in Phys. Rev. B 79, 195125 (2009). In our approach, momentum dependences are taken into account with improved precision compared to previous studies of related models. Around a generic parameter set, we find a strong competition of antiferromagnetic and d-wave Cooper instabilities with a smooth behavior under a variation of doping and additional hopping parameters. For increasingly incommensurate ordering tendencies in the magnetic channel, the d-wave pairing gap is deformed at its maxima. Comparing our results for the Emery model to those obtained for the two-dimensional one-band Hubbard model with effective parameters, we find that, despite considerable qualitative agreement, multiorbital effects have a significant impact on a quantitative level.
【 授权许可】
Free