C-axis Raman spectra of a normal plane-chain bilayer cuprate and the pseudogap

Details C-axis Raman spectra of a normal plane-chain bilayer cuprate and the pseudogap C-axis Raman spectra of a normal plane-chain bilayer cuprate and the pseudogap

1996-12-16

arxiv.org/abs/cond-mat/9612149v1

Physics

Condensed Matter

23 pages, 6 figures, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.56.6327

We investigate the Raman spectra in the geometry where both incident and scattered photon polarizations are parallel to the $\hat{z}$-direction, for a plane-chain bilayer coupled via a single-particle tunneling $t_\perp$. The Raman vertex is derived in the tight-binding limit and in the absence of Coulomb screening, the Raman intensity can be separated into intraband ($\propto t_\perp^4$) and interband ($\propto t_\perp^2$) transitions. In the small-$t_\perp$ limit, the interband part dominates and a pseudogap will appear as it does in the conductivity. Coulomb interactions bring in a two-particle coupling and result in the breakdown of intra- and interband separation. Nevertheless, when $t_\perp$ is small, the Coulomb screening ($\propto t_\perp^4$) has little effect on the intensity to which the unscreened interband transitions contribute most. In general, the total Raman spectra are strongly dependent on the magnitude of $t_\perp$.

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