Optical conductivity due to orbital polarons in systems with orbital degeneracy

Piotr Wróbel, Robert Eder, and Andrzej M. Oleś
Phys. Rev. B 86, 064415 – Published 9 August 2012

Abstract

We consider the impact of orbital polarons in doped orbitally ordered systems on optical conductivity using the simplest generic model capturing the directional nature of either t2g (or eg) orbital states in certain transition metal oxides or p orbital states of cold atoms in optical lattices. The origin of the optical transitions is analyzed in detail and we demonstrate that the optical spectra (i) are determined by the string picture, i.e., flipped orbitals along the hole hopping path, and (ii) consist of three narrow peaks which stem from distinct excitations. They occur within the Mott-Hubbard gap similar to the superconducting cuprates but indicate hole confinement, in contrast to the spin t-J model. Finally, we point out how to use the point group symmetry to classify the optical transitions.

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  • Received 3 May 2012

DOI:https://doi.org/10.1103/PhysRevB.86.064415

©2012 American Physical Society

Authors & Affiliations

Piotr Wróbel1,2, Robert Eder3, and Andrzej M. Oleś4,5

  • 1Max Planck Institute for the Physics of Complex Systems, Nöthnitzerstr. 38, D-01187 Dresden, Germany
  • 2Institute for Low Temperature and Structure Research, P. O. Box 1410, PL-50950 Wrocław 2, Poland
  • 3Karlsruhe Institute of Technology, Institut für Festkörphysik, D-76021 Karlsruhe, Germany
  • 4Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
  • 5Marian Smoluchowski Institute of Physics, Jagellonian University, Reymonta 4, PL-30059 Kraków, Poland

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Issue

Vol. 86, Iss. 6 — 1 August 2012

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