Coherent Terahertz Radiation from a Nonlinear Oscillator of Viscous Electrons

Abstract

Compressible electron flow through a narrow cavity is theoretically unstable, and the oscillations occurring during the instability have been proposed as a method of generating Terahertz radiation. We numerically demonstrate that the endpoint of this instability is a nonlinear hydrodynamic oscillator, consisting of an alternating shock wave and rarefaction-like relaxation flowing back and forth in the device. This qualitative physics is robust to cavity inhomogeneity and changes in the equation of state of the fluid. We discuss the frequency and amplitude dependence of the emitted radiation on physical parameters (viscosity, momentum relaxation rate, and bias current) beyond linear response theory, providing clear predictions for future experiments.

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Cited by in corpus (13)

• Hydrodynamic approach to two-dimensional electron systems
• Hydrodynamic theory of the Dyakonov-Shur instability in graphene transistors
• Hydrodynamical study of Terahertz emission in magnetized graphene field-effect transistors
• Dissipation-enabled hydrodynamic conductivity in a tunable bandgap semiconductor
• Wiedemann-Franz law for massless Dirac fermions with implications for graphene
• Plasmonic quantum nonlinear Hall effect in noncentrosymmetric 2D materials
• Strong suppression of electron convection in Dirac and Weyl semimetals
• Terahertz Radiation from the Dyakonov-Shur Instability of Hydrodynamic Electrons in a Corbino Geometry
• Polarized light emission from graphene induced by terahertz pulses
• Hydrodynamics of the electronic Fermi liquid: a pedagogical overview
• THz detection and amplification using plasmonic Field Effect Transistors driven by DC drain currents
• TeraFET terahertz detectors with spatially non-uniform gate capacitances
• Entropy Wave Instability in Dirac and Weyl Semimetals