01 January 2020 6 3K Report

In metals, the outermost conduction electrons (electron plasma) interact with incident photons and according to the classical Drude model, they may resonate and build up longitudinal plasmonic waves either in bulk or surface depending on photons' energy. Similarly, high doped semiconductors and in some cases an intrinsic semiconductor like InSb can support these collective oscillations. But, based on our knowledge, we have both electrons' and holes' plasma in semiconductors which can interact with external perturbations like photons. Hence, why we consider only the electrons share in the plasmonic response of semiconductors?

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