Spin and charge susceptibilities of the two-orbital model within the cluster perturbation theory for Fe-based materials

Abstract

Cluster perturbation theory is used to calculate band structure, spectral functions, Fermi surface, and spin and charge susceptibilities for the two-orbital model of iron pnictides with the on-site multiorbital Hubbard interactions. Susceptibilities are calculated within the approximation combining the cluster perturbation theory for the self-energy corrections and the random-phase approximation (RPA) for the vertex renormalizations. Calculations for the small values of Hubbard repulsion $U\le 2$ confirm that the rigid band approximation and RPA for the spin and charge susceptibilities are suitable approaches for the case of weak interactions.

arXiv comment5 pages, 5 figures, published version

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Cited by in corpus (3)

• Linear mapping between magnetic susceptibility and entanglement in conventional and exotic one-dimensional superfluids
• One- and two-particle correlation functions in the cluster perturbation theory for cuprates
• Lattice, Charge and Spin phase inhomogeneity in complex striped quantum matter