Abstract

We compare the spectral functions of a hole moving in the orbital-ordered undoped LaMnO3, obtained using a self-consistent Born approximation. The quasiparticle (QP) dispersion and spectral weight depend critically on the type of orbital ordering. If a hole scatters on orbital excitations, the QP dispersion on the orbiton energy scale is modified by orbital polarization and by electron-lattice coupling. A lower QP dispersion and quantum decoherence are obtained due to the inter-planar hole-magnon scattering in the A-AF phase which disproves the classical concept of a ferromagnetic polaron.

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