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

Maria Daghofer, Krzysztof Wohlfeld, Andrzej M. Oleś, Enrico Arrigoni, and Peter Horsch
Phys. Rev. Lett. 100, 066403 – Published 13 February 2008

Abstract

We investigate the spectral properties of a hole moving in a two-dimensional Hubbard model for strongly correlated t2g 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 eg compounds, and we argue that orbital degeneracy alone does not lead to hole self-localization.

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  • Received 3 August 2007

DOI:https://doi.org/10.1103/PhysRevLett.100.066403

©2008 American Physical Society

Authors & Affiliations

Maria Daghofer1, Krzysztof Wohlfeld1,2, Andrzej M. Oleś1,2, Enrico Arrigoni3, and Peter Horsch1

  • 1Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
  • 2Marian Smoluchowski Institute of Physics, Jagellonian University, Reymonta 4, PL-30059 Kraków, Poland
  • 3Institute of Theoretical and Computational Physics, Graz University of Technology, A-8010 Graz, Austria

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Vol. 100, Iss. 6 — 15 February 2008

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