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The low frequency noise (LFN) method was used to characterize a two-dimensional electron gas (2DEG) in a double AlGaAs/GaAs/AlGaAs heterojunction from room temperature to cryogenic one. Measurements on noise presented by the power spectral density (PSD) of drain voltage are analyzed as a function for different applied voltages and temperatures in the frequency range from 1 Hz to 100 kHz. PSD can be...