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

TL;DR

This paper develops a hydrodynamic model for charge transport in magnetized graphene FETs, analyzing how magnetic fields influence plasma instabilities and flow dynamics, with numerical simulations supporting the theoretical findings.

Contribution

It introduces a comprehensive hydrodynamic framework for magnetized graphene FETs and examines magnetic field effects on plasma instabilities and flow limits.

Findings

Magnetic fields increase the dispersion gap, limiting low-frequency instabilities.

Magnetic fields decrease the growth rate and saturation amplitude of instabilities.

Numerical simulations confirm the theoretical impact of magnetic fields on plasma dynamics.

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.