Collective excitations in fast ion conductor superlattices |
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Authors: | M. Aniya M. Kobayashi |
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Affiliation: | (1) Graduate School of Science and Technology, Niigata University, 950-21 Niigata, Japan;(2) Department of Physics, Niigata University, 950-21 Niigata, Japan |
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Abstract: | Within the framework of the electromagnetic theory, the collective modes in the superlattice system composed of superionic conductors and ionic crystals are studied. The superionic conductor is described by the hydrodynamical model in which the anion cage is immersed in the cation liquid. The behavior of the modes are analysed in terms of the coupling strength between excitations pertaining to different layers. The coupling strength is controlled by varying the slab thicknesses. An interesting behavior in which the diffusion mode transforms to the relaxation mode when the coupling strength is varied from strong to weak is obtained. Also, the effect of the coupling strength on the acoustical and optical modes are shown. |
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Keywords: | 68.65.+ g 73.20.Mf 66.30.Dn |
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