Effects of a k-dependent Hybridization on the Fermi Surface of an Extended $d-p$ Hubbard Model

Abstract

The topology of the Fermi surface of an extended $d-p$ Hubbard model is investigated using the Green's function technique in a n-pole approximation. The effects of the $d-p$ hybridization on the Fermi surface are the main focus in the present work. Nevertheless, the effects of doping, Coulomb interaction and hopping to second-nearest-neighbors on the Fermi surface, are also studied. Particularly, it is shown that the crossover from hole-like to electron-like Fermi surface (Lifshitz transition) is deeply affected by the $d-p$ hybridization. Moreover, the pseudogap present in the low doping regime is also affected by the hybridization. The results show that both the doping and the hybridization act in the sense of suppresses the pseudogap. Therefore, the systematic investigation of the Fermi surface topology, shows that not only the doping but also the hybridization can be considered as a control parameter for both the pseudogap and the Lifshitz transition. Assuming that the hybridization is sensitive to external pressure, the present results agree qualitatively with recent experimental data for the cuprate Nd-LSCO.

11 pages, 7 figures

References in corpus (10)

• Physics of cuprates with the two-band Hubbard model - The validity of the one-band Hubbard model
• Pseudogap phase of cuprate superconductors confined by Fermi surface topology
• Cuprate Fermi orbits and Fermi arcs: the effect of short-range antiferromagnetic order
• Composite-Fermion Theory for Pseudogap, Fermi Arc, Hole Pocket, and Non-Fermi-Liquid of Underdoped Cuprate Superconductors
• Higher superconducting transition temperature by breaking the universal pressure relation
• Lifshitz Transition in the Two Dimensional Hubbard Model
• Multiorbital analysis of the effects of uniaxial and hydrostatic pressure on $T_c$ in the single-layered cuprate superconductors
• Role of oxygen-oxygen hopping in the three-band copper-oxide model: quasiparticle weight, metal insulator and magnetic phase boundaries, gap values and optical conductivity
• Effects of interaction strength, doping, and frustration on the antiferromagnetic phase of the two-dimensional Hubbard model
• Influence of the symmetry of the hybridization on the critical temperature of multi-band superconductors

Cited by in corpus (1)

• The interplay between a pseudogap and superconductivity in a two-dimensional Hubbard model