Abstract
Results are presented on spatially resolved Raman scattering and photoluminescence measurements of a drifting two-dimensional electron gas. Under drifting conditions, a low energy feature is observed in polarized Raman scattering in addition to the intrasubband plasmon mode, and was found to disperse linearly with in-plane wavevector. RPA calculations for a single thermalized 2DEG fail to predict the existence of this low energy feature, which may be an additional plasmon mode due to the presence of a secondary population of hot electrons. Large variations in the intensities and energies of the plasmon and the low energy feature are observed with position along the drift channel.
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