研究目的
Investigation of moments-based transport models applied to plasma waves and the Dyakonov–Shur instability
研究成果
The study concludes that hydrodynamic models with anisotropic closure relations are necessary for accurately simulating THz wave generation. The inclusion of convective terms, despite their numerical complexity, is essential for meaningful simulations of the Dyakonov–Shur plasma instability.
研究不足
The macroscopic relaxation time approximations limit the perfect match to the BTE, even with more moments included. The study is conducted under idealized conditions, which may not fully represent realistic device structures.
1：Experimental Design and Method Selection:
The study derives and analyzes two drift-diffusion models based on the first two moments of the Boltzmann transport equation (BTE) and two hydrodynamic models based on four moments for their accuracy in the THz frequency range, focusing on plasma wave generation. The models are compared to the BTE under homogeneous bulk conditions with harmonic waves assumed.
2：Sample Selection and Data Sources:
The investigation uses homogeneous simulations of the BTE for silicon, with scattering model and band structure from a referenced study, assuming isotropic effective mass and parabolic bands.
3：List of Experimental Equipment and Materials:
A double-gate device with specific dimensions and material properties is considered, including oxide permittivity and conductive layer assumptions.
4：Experimental Procedures and Operational Workflow:
The study involves small-signal analysis, dispersion relation analysis, and the implementation of the Dyakonov–Shur approach to predict plasma instabilities under idealized conditions.
5：Data Analysis Methods:
The small-signal mobility is computed, and the models are compared based on their ability to describe plasma oscillations by comparing them to the BTE.
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