Nonreciprocal propagation and localization of plasmons by a magnetic field in finite semiconductorn-i-p-isuperlattices

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Abstract
We consider the effects of an external magnetic field on plasmons propagating in finite n-i-p-i (n-doped material–insulator–p-doped material–insulator) superlattices. The magnetic field is applied parallel to the interfaces and we consider propagation perpendicular to the applied field. We find that the magnetic field can have two effects: (1) the dispersion relations can become nonreciprocal, or (2) the excitations can become (nonreciprocally) localized. The particular effect depends critically upon the number of layers; for a structure composed of an unequal number of n- and p-doped layers, the modes can be strongly localized, while in a structure composed of an equal number of n- and p-doped layers the dispersion curves become nonreciprocal.