Exact spectral function for hole-magnon coupling in the ferromagnetic CuO${}_3$-like chain

Abstract

We present the exact spectral function for a single oxygen hole with spin opposite to ferromagnetic order within a one-dimensional CuO${}_3$-like spin chain. We find that local Kondo-like exchange interaction generates five different states in the strong coupling regime. It stabilizes a spin polaron which is a bound state of a moving charge dressed by magnon excitations, with essentially the same dispersion as predicted by mean field theory. We then examine in detail the evolution of the spectral function for increasing strength of the hole-magnon interaction. We also demonstrate that the $s$ and $p$ symmetry of orbital states in the conduction band are essentially equivalent to each other and find that the simplified models do not suffice to reproduce subtle aspects of hole-magnon coupling in the charge-transfer model.

9 pages, 5 figures

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Cited by in corpus (5)

• Charge transfer model for the electronic structure of layered ruthenates
• The Green function variational approximation: Significance of physical constraints
• On the Neglect of Local Coulomb Interaction on Oxygens in Perovskites Described by the Multi-band $d-p$ Model
• Quantum versus classical polarons in a ferromagnetic CuO${}_3$-like chain
• Polaron states in a CuO chain