On the universal optical conductivity and single-particle relaxation in cuprates
Peter Prelovsek
Abstract
The origin of the universal optical conductivity form sigma(omega) ~ (1-e(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 behaviour appears quite generally when the single-particle excitations are overdamped and their relaxation follows the marginal Fermi liquid concept. Relation to recent ARPES experiments is also discussed.
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