Hydrodynamical study of Terahertz emission in magnetized graphene field-effect transistors

Abstract

Several hydrodynamic descriptions of charge transport in graphene have been presented in the late years. We discuss a general hydrodynamic model governing the dynamics of a two-dimensional electron gas in a magnetized field-effect transistor in the slow drift regime. The Dyakonov--Shur instability is investigated including the effect of weak magnetic fields (i.e. away from Landau levels). We show that the gap on the dispersion relation prevents the instability to reach the lower frequencies thus imposing a limit on the Mach number of the electronic flow. Furthermore, we discuss that the presence of the external magnetic field decreases the growth rate of the instability, as well as the saturation amplitude. The numerical results from our simulations and the presented higher order dynamic mode decomposition support such reasoning.

References in corpus (3)

• Mobility and Saturation Velocity in Graphene on SiO2
• Hydrodynamics of electrons in graphene
• A hydrodynamic model approach to the formation of plasmonic wakes in graphene

Cited by in corpus (5)

• Electrical Tuning of Terahertz Plasmonic Crystal Phases
• Superballistic conduction in hydrodynamic antidot graphene superlattices
• Plasmonic quantum nonlinear Hall effect in noncentrosymmetric 2D materials
• TeraFET terahertz detectors with spatially non-uniform gate capacitances
• Hydrodynamic electrons in Graphene: a viscous boundary-layer description