Orbiton-magnon interplay in the spin-orbital polarons of KCuF3 and LaMnO3

Abstract

We present a quasi-analytical solution of a spin-orbital model of KCuF${}_3$, using the variational method for Green's functions. By analyzing the spectra for different partial bosonic compositions as well as the full solution, we show that hole propagation needs both orbiton and magnon excitations to develop, but the orbitons dominate the picture. We further elucidate the role of the different bosons by analyzing the self-energies for simplified models, establishing that because of the nature of the spin-orbital ground state, magnons alone do not produce a full quasiparticle band, in contrast to orbitons. Finally, using the electron-hole transformation between the $e_g$ states of KCuF${}_3$ and LaMnO${}_3$ we suggest the qualitative scenario for photoemission experiments in LaMnO${}_3$.

arXiv comment8 pages, 4 figures, accepted by Physical Review B

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Cited by in corpus (5)

• Fingerprints of spin-orbital polarons and of their disorder in the photoemission spectra of doped Mott insulators with orbital degeneracy
• From "Weak" to "Strong" Hole Confinement in a Mott Insulator
• Spin, orbital and topological order in models of strongly correlated electrons
• Magnon dressing by orbital excitations in ferromagnetic planes of K${}_2$CuF${}_4$ and LaMnO${}_3$
• Spectral properties of spin-orbital polarons as a fingerprint of orbital order