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- W2026106311 abstract "The noise temperature of GaAs ${mathit{n}}^{+}$${mathit{nn}}^{+}$ two-terminal structures of micrometer and submicrometer lengths is theoretically analyzed as a function of frequency and applied voltage. Calculations are performed at a kinetic level, and are based on a mixed Monte Carlo hydrodynamic scheme. Different operation modes of the structure are considered, namely, when operating as a nonlinear resistor (passive device) as well as when operating as a Gunn amplifier or generator (active device). Under generating conditions the noise temperature at low frequency is found to go to infinity for voltages above the threshold value for the Gunn effect, as expected in bulk material. Under amplifying conditions the noise temperature at low frequency is found to remain finite even at applied voltages well above the threshold value for the Gunn effect. At high frequencies the noise-temperature spectrum shows structures associated with transit-time effects, carrier energy, and plasma-time effects. In particular, we calculate the noise figure of merit covering both amplifying and passive conditions. Very good agreement is found between theory and available experiments. textcopyright{} 1996 The American Physical Society." @default.
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- W2026106311 date "1996-09-15" @default.
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- W2026106311 title "Noise temperature ofn+nn+GaAs structures" @default.
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- W2026106311 doi "https://doi.org/10.1103/physrevb.54.8821" @default.
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