Absence of Hole Confinement in Transition Metal Oxides with Orbital Degeneracy

Abstract

We investigate the spectral properties of a hole moving in a two-dimensional Hubbard model for strongly correlated t_2g electrons. Although superexchange interactions are Ising-like, a quasi-one-dimensional coherent hole motion arises due to effective three-site terms. This mechanism is fundamentally different from the hole motion via quantum fluctuations in the conventional spin model with SU(2) symmetry. The orbital model describes also propagation of a hole in some e_g compounds, and we argue that orbital degeneracy alone does not lead to hole self-localization.

4 pages, 5 figures

References in corpus (3)

• Variational cluster approach to correlated electron systems in low dimensions
• Self-energy-functional approach: Analytical results and the Mott-Hubbard transition
• Dilution Effects in Two-dimensional Quantum Orbital System

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