Abstract
When the boundary conditions of the source and drain are asymmetric, the plasma waves may become unstable in the channel of a field effect transistor (FET). We use the quantum magnetohydrodynamic model to study the influence of the quantum Bohm potential, Fermi statistical pressure, and electron spin effects on the stability of THz plasma waves propagating perpendicular to the magnetic field in the FET. A dispersion equation governing the THz plasma oscillation is obtained. Numerical results have shown that the presence of spin effects has enlarged the instable range of β, enhanced the instability increment, and made the frequency of THz plasma waves larger. The research shows that nanometer FETs with spin effects have advantages in realizing practical terahertz radiation.
Highlights
In recent years, the study of THz electrical radiation has attracted widespread attention from the scientific community.1–5 It has huge potential applications in the fields of radio astronomy, remote sensing, commercial imaging, biomedicine, broadband communications, and so on
We investigate the instability of THz plasma waves in quantum field effect transistor (FET) with the spin effects, external magnetized field, and other physical mechanisms
The instability increment and the instable range of β increase with H, q, and ωpe but decrease with ωce; the frequency of THz plasma waves increases with ωce, H, q, and ωpe; when the values of H, q, and ωpe increase but that of ωce decrease, the values of β corresponding to the peak of instability increment are going to move to the right along the β axis
Summary
The study of THz electrical radiation has attracted widespread attention from the scientific community. It has huge potential applications in the fields of radio astronomy, remote sensing, commercial imaging, biomedicine, broadband communications, and so on. The instability of the plasma waves in FETs provides a new possibility for the generation of THz electromagnetic radiation. The influence of electron spin effects on circularly polarized waves propagating in magnetized quantum plasmas was investigated, and a new eigenmode was found. It is necessary to understand the physical mechanism of THz waves’ emission in nano-FETs. In this paper, we investigate the instability of THz plasma waves in quantum FETs with the spin effects, external magnetized field, and other physical mechanisms. We use Fourier analysis to obtain the dispersion relation describing the oscillation of THz plasma waves in quantum FETs. The main purpose of this paper is to study the relationship of the feature of THz oscillation, that is, instability increment and oscillation frequency, with the dimensionless Fermi velocity, cyclotron frequency, Bohr magneton and Langevin parameters, spin effects, and external magnetized field
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