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Optical absorption edge in one-dimensional conductors

J. M. P. Carmelo·P. D. Sacramento·N. M. R. Peres·D. Baeriswyl
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Abstract

The frequency-dependent conductivity is studied for both the one-dimensional Hubbard model and a model of spinless fermions, using a selection rule, the Bethe ansatz energy eigenstates, and conformal invariance. For densities where the system is metallic the absorption spectrum has two contributions, a Drude peak at ω= 0 separated by a pseudo-gap from a broad absorption band whose lower edge is characterized by a non-classical critical exponent. Our findings are expected to shed new light on the ``far infrared puzzle'' of metallic organic chain compounds.

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J. M. P. Carmelo, P. D. Sacramento, N. M. R. Peres, D. Baeriswyl. 1998-05-05. Optical absorption edge in one-dimensional conductors. https://arxiv.org/abs/cond-mat/9805043

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