We show that the onset of soft parametric resonance (SPR) at ω η ω F, where ω F e F o v f / ω O P for hot carriers interacting with optic phonons ω O P in graphene is independent of temperature, whereas η ∼ 0.56 is practically independent of the DC field F o, which makes SPR tunable over a sizeable range of Fo. Our model based on the linearization of the time-dependent Boltzmann transport equation (BTE) predicts a secondary resonance at ω ∼ ω F, emerging from a weak shoulder in the ac current at T 300 K, when the temperature decreases to T 77 K and lower. The two resonances behave differently as scattering at low energy strengthens.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)