Abstract
We discuss the possible existance of transverse optical plasma modes in superlattices consisting of Josephson coupled superconducting layers. These modes appear as resonances in the current-current correlation function, as opposed to the usual plasmons which are poles in the density-density channel. We consider both bilayer superlattices, and single layer lattices with a spread of interlayer Josephson couplings. We show that our model is in quantitative agreement with the recent experimental observation by a number of groups of a peak at the Josephson plasma frequency in the optical conductivity of La1.85Sr0.15CuO4.
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van der Marel, D., Tsvetkov, A. Transverse optical plasmons in layered superconductors. Czech J Phys 46 (Suppl 6), 3165–3168 (1996). https://doi.org/10.1007/BF02548125
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DOI: https://doi.org/10.1007/BF02548125