Surface polaritons in an LO-phonon-plasmon coupled system are studied in cylindrical and semi-infinite geometries. Characters of the dispersion relation of the surface polaritons are very different from the case of high carrier electron density and for the case of low density. With electron current the surface polaritons are destabilized in the low-density regime, while they remain stable in the high-density regime.
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Tajima et al. (1978) studied this question.
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