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Optical Conductivity of a t--J Ladder

C. A. Hayward·D. Poilblanc·D. J. Scalapino
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Abstract

The optical conductivity $σ(ω)$ of a doped two-leg t--J ladder is calculated for an electric field polarized parallel to the legs of the ladder. The conductivity has a Drude weight proportional to the hole doping and an apparent threshold for absorption (a pseudo gap) which may be associated with the energy to break a pair. This pseudogap in $σ(ω)$ is present even though the pairs have a modified $d_{x^2-y^2}$-like wave function because the geometry of the ladder leads to quasi-particle states which probe the gap along an antinode.

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C. A. Hayward, D. Poilblanc, D. J. Scalapino. 1995-12-20. Optical Conductivity of a t--J Ladder. https://doi.org/10.1103/physrevb.53.r8863

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