Optical conductivity of a strong-coupling polaron
classification
❄️ cond-mat.str-el
keywords
opticalconductivitypolaronstrong-couplingaccurateagreementalphaanalytic
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The polaron optical conductivity is derived within the strong-coupling expansion, which is asymptotically exact in the strong-coupling limit. The polaron optical conductivity band is provided by the multiphonon optical transitions. The polaron optical conductivity spectra calculated within our analytic strong-coupling approach and the numerically accurate Diagrammatic Quantum Monte Carlo (DQMC) data are in a good agreement with each other at large $\alpha \gtrapprox 9$.
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