This work theoretically explores the perspectives of stacked graphene-insulator-graphene layers as active terahertz devices. Out-of-plane resonant tunneling current between the graphene layers is shown to constitute a gain medium for electron-plasma-waves propagating in the plane of the graphene sheets. The interaction between both phenomena can lead to either stable THz amplification (with power gain >7 dB) or very sensitive terahertz detection (with sensitivity >105 V/W) under appropriate device configurations.
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