The effect of screening of the coulomb interaction between two layers of two-dimensional electrons, such as in graphene, by a highly doped semiconducting substrate is investigated. We employ the random-phase approximation to calculate the dispersion equation of this hybrid structure in order to determine the plasmon excitation spectrum. When an electric current is passed through a layer, the low-frequency plasmons in the layer may bifurcate into separate streams due to the current-driving effect. At a critical wave vector, determined by the separation between layers and their distance from the surface, their phase velocities may be in opposite directions and a surface plasmon instability leads to the emission of radiation. Applications to detectors and other electromagnetic devices exploiting nano-plasmonics are discussed.

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phase velocities semiconducting substrate lowfrequency plasmons surface plasmon instability twodimensional electrons detectors dispersion equation structure other electromagnetic devices coulomb interaction randomphase approximation critical wave vector currentdriving effect

Gumbs Godfrey,Iurov Andrii,Huang Danhong,.Engineering semiconductor hybrids for sensing. 3 (1),.

Gumbs Godfrey,Iurov Andrii,Huang Danhong,"Engineering semiconductor hybrids for sensing" 3

Gumbs Godfrey,Iurov Andrii,Huang Danhong,"Engineering semiconductor hybrids for sensing"