Hung T. Dang, Jernej Mravlje, Antoine Georges, and Andrew J. Millis
Phys. Rev. Lett. 115, 107003 – Published 3 September 2015
Density functional plus dynamical mean field calculations are used to show that in transition metal oxides, rotational and tilting ([Math Processing Error]-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 [Math Processing Error], 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 ([Math Processing Error]) are discussed.
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