Abstract
The noise properties of semiconductor alloy-based resonant-tunneling double-barrier quantum-well structures are calculated within a nonequilibrium Green's-function formulation. Alloy scattering is treated in the coherent-potential approximation including vertex corrections. Different noise characteristics are found depending on applied bias, scattering strength, and the transparency of the barriers. A characteristic frequency for the noise current power spectrum S(ω) is given by the inverse response time
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