Small-signal ac response of an electron gas under a strong dc bias

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Abstract
We analyze the small-signal ac response of an electron gas with or without a dc bias, including contributions due to plasma modes and electron temperature oscillations. It is pointed that under a strong dc bias the prominent plasma-induced structure showing up in the 0-K memory function is greatly suppressed by the rise of the electron temperature in a realistic semiconductor, in contrast with the earlier result. Oscillation of the electron temperature also plays an important role in the ac response in a parallel configuration at low frequency under a strong dc bias.