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Publication Detail / Abstract

H. T. Dang, J. Mravlje, A. Georges, A. J. Millis

Band Structure and Terahertz Optical Conductivity of Transition Metal Oxides: Theory and Application to CaRuO3

published in PRL on September 3, 2015
> Full text via publisher
Density functional plus dynamical mean field calculations are used to show that in transition metal oxides, rotational and tilting (GdFeO3-type) distortions of the ideal cubic perovskite structure produce a multiplicity of low-energy optical transitions which affect the conductivity down to frequencies of the order of 1 or 2 mV (terahertz regime), mimicking non-Fermi-liquid effects even in systems with a strictly Fermi-liquid self-energy. For CaRuO3, a material whose measured electromagnetic response in the terahertz frequency regime has been interpreted as evidence for non-Fermi-liquid physics, the combination of these band structure effects and a renormalized Fermi-liquid self-energy accounts for the low frequency optical response which had previously been regarded as a signature of exotic physics. Signatures of deviations from Fermi-liquid behavior at higher frequencies (~100 meV) are discussed.
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