Optical Conductivity of a t--J Ladder

Details Optical Conductivity of a t--J Ladder Optical Conductivity of a t--J Ladder

1995-12-20

arxiv.org/abs/cond-mat/9512141v1

Physics

Condensed Matter

Latex file, figures upon request, submitted in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.53.R8863

The optical conductivity $\sigma(\omega )$ 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 $\sigma (\omega )$ 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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