On the universal optical conductivity and single-particle relaxation in cuprates

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Abstract
The origin of the universal optical conductivity form sigma(omega) ~ (1-exp(-omega/T)/omega established in numerical model studies of doped antiferromagnets and consistent with experiments on cuprates near optimal doping is discussed. It is shown that such a behavior appears quite generally when the single-particle excitations are overdamped and their relaxation follows the marginal Fermi liquid concept. The effective conductivity relaxation rate in this case is not directly related to single-particle damping.

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