Optical conductivity in A3C60 (A=K, Rb)
J. van den Brink(1,2), Olle Gunnarsson(1), V. Eyert(1,3), ((1)Max-Planck-Institut f\"ur Festk\"orperforschung, Stuttgart, Germany, (2)Laboratory of Solid State, Applied Physics, University of Groningen,, The Netherlands (3)Hahn-Meitner-Institut, Berlin, Germany)
TL;DR
This paper investigates the optical conductivity in A3C60 compounds, incorporating electron-phonon interactions to explain features like the Drude peak narrowing and mid-infrared spectral weight transfer, but finds the model insufficient to fully match experimental data.
Contribution
It introduces a lowest-order electron-phonon coupling model to analyze optical conductivity in A3C60, highlighting its limitations in reproducing experimental observations.
Findings
Drude peak narrows by factor 1+lambda
Spectral weight shifts to mid-infrared region
Model does not fully match experimental data
Abstract
We study the optical conductivity in A3C60 (A =K, Rb). The effects of the electron-phonon interaction is included to lowest order in the coupling strength lambda. It is shown that this leads to a narrowing of the Drude peak by a factor 1+lambda and a transfer of weight to a mid-infrared peak at somewhat larger energies than the phonon energy. Although this goes in the right direction, it is not sufficient to describe experiment.
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