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- W3083693058 abstract "We theoretically study the generation of microwave radiation at frequency 2ω1−ω2, produced by two microwaves, of frequencies ω1 and ω2, normally incident on monolayer graphene grown epitaxially on a SiC substrate and doped by electrostatic gating. Two mechanisms responsible for this third-order nonlinear effect are considered: (i) the graphene’s conduction band nonparabolicity arising from the substrate-induced bandgap opening at the Dirac points of the graphene’s Brillouin zone and (ii) the energy dependence of the electron-momentum relaxation time. Both mechanisms are incorporated in our Boltzmann-equation-based treatment of the graphene’s third-order nonlinear response to the applied microwave radiation field. Within the framework of the approach, we evaluate the output power P2ω1−ω2 of the (2ω1−ω2) microwave radiation as a function of the graphene’s carrier density nS controlled by the applied gate voltage. Our formulation predicts an unexpected nonmonotonous behavior of this function: there is a pronounced minimum in the P2ω1−ω2(nS), which is followed by a maximum. This finding may serve to provide a rational explanation for this type of oscillation as observed by Dragoman et al. [Appl. Phys. Lett. 97, 093101 (2010)] in the output power of the microwave harmonic generation in gated graphene, which are not properly construed so far." @default.
- W3083693058 created "2020-09-11" @default.
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- W3083693058 date "2020-09-03" @default.
- W3083693058 modified "2023-09-27" @default.
- W3083693058 title "Microwave (2<i>ω</i><sub>1</sub> − <i>ω</i><sub>2</sub>) frequency mixing by mobile carriers in electron-doped and gapped graphene" @default.
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- W3083693058 doi "https://doi.org/10.1063/5.0015299" @default.
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