Investigation of the Dyakonov-Shur instability for THz plasma waves in quantum gated cylindrical FET

Zhang, Liping; Su, Junyan

doi:10.1063/1.5130598

Cited by 6 publications

(3 citation statements)

References 25 publications

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“…A strong dependence on geometry can generi-cally be expected in the hydrodynamic regime due to the non-local relation between current and electric field. In fact, the performance of plasma oscillations for the generation and detection of radiation has been found to depend strongly on the geometry in previous work [60,63,64].…”

Section: Introductionmentioning

confidence: 97%

“…Further, recent numerical simulations [56] have observed the endpoint of this instability to be a coherent linear oscillator, making the phenomenon even more promising as a radiation source. However, despite extensive work on the topic [3,[56][57][58][59][60][61][62][63][64], an experimental detection of the DS instability is still lacking.…”

Section: Introductionmentioning

confidence: 99%

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Terahertz Radiation from the Dyakonov-Shur Instability of Hydrodynamic Electrons in a Corbino Geometry

Farrell¹,

Grisouard²,

Scaffidi³

2021

Preprint

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Hydrodynamic electrons flowing through a two-dimensional channel are predicted to undergo a plasma instability above a critical drift velocity. This Dyakonov-Shur (DS) instability terminates as a coherent nonlinear oscillator which shows promise as a source of radiation that could fill the so-called TeraHertz gap. In this work, we study radial flow in a Corbino disk, and demonstrate how the DS instability is substantially enhanced in this geometry, both in terms of a lower critical drift velocity and a higher generated power. Interestingly, hydrodynamic electron flows were recently reported in a graphene sample of this geometry, and our results are therefore directly relevant to current efforts to detect this experimentally elusive phenomenon. The analysis is based on a hydrodynamic approach and features both linearized calculations as well as full numerical simulations of the Navier-Stokes equation.

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Terahertz Radiation from the Dyakonov-Shur Instability of Hydrodynamic Electrons in a Corbino Geometry

Farrell¹,

Grisouard²,

Scaffidi³

2021

Preprint

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show abstract

“…Recently, scientific interest in solid-state terahertz (THz) devices (operating at frequencies between 300 GHz and 3 THz) has increased significantly [1][2][3][4][5]. The main idea, based on the shallow-water analogy put forward by Dyakonov and Shur [6][7][8], is to use field-effect transistors with high-mobility channels as nonlinear elements for the resonant detection of incident THz radiation.…”

Section: Introductionmentioning

confidence: 99%

A numerical approach to quasi-ballistic transport and plasma oscillations in junctionless nanowire transistors

2020

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A numerical framework for DC and RF small-signal simulations of nanowire transistors is presented, which is based on the self-consistent solution of the Poisson, Schrödinger, and Boltzmann transport equations and is stable for the entire range from weak to strong particle scattering. The proposed approach does not suffer from the deficiencies due to the transformation of the Boltzmann transport equation into the energy space and can handle the quasi-ballistic case. This is a key requirement for the investigation of plasma resonances and other high-mobility phenomena. The in-house solver is validated with results of a previously developed simulator based on the H-transformation for a conventional N + NN + silicon transistor with strong scattering. Then, its results are compared with those of moments-based models and it is shown that these do not provide a satisfactory description of the electron dynamics in the quasi-ballistic transport regime. Furthermore, the internal boundary conditions of the transport models at the contacts are found to have a significant impact on plasma resonances and the physics-based thermal-bath boundary condition strongly suppresses them.

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Spin contribution to the instability of THz plasma waves

2021

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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.

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Investigation of the Dyakonov-Shur instability for THz plasma waves in quantum gated cylindrical FET

Abstract: Terahertz intersubband absorption of GaN/AlGaN step quantum wells grown by MOVPE on Si(111) and Si(110) substrates

Cited by 6 publications

References 25 publications

Terahertz Radiation from the Dyakonov-Shur Instability of Hydrodynamic Electrons in a Corbino Geometry

Terahertz Radiation from the Dyakonov-Shur Instability of Hydrodynamic Electrons in a Corbino Geometry

A numerical approach to quasi-ballistic transport and plasma oscillations in junctionless nanowire transistors

Spin contribution to the instability of THz plasma waves

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