Absence of Hole Confinement in Transition Metal Oxides with Orbital Degeneracy

Details Absence of Hole Confinement in Transition Metal Oxides with Orbital Degeneracy Absence of Hole Confinement in Transition Metal Oxides with Orbital Degeneracy

2008-02-14

arxiv.org/abs/0802.2012v1

Phys. Rev. Lett. 100, 066403 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.100.066403

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.

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