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- W2073696140 abstract "The frequency distribution of the phonons emitted by a heated two-dimensional electron gas in a Si metal oxide semiconductor field-effect transitor has been investigated at power densities at which there is significant thermal population of an excited subband. The investigation has been carried out using an exciton cloud detector which uses the fact that phonons of frequency >920 GHz induce a decrease in the bound-exciton (BE) luminescence from the cloud and a corresponding increase in the free-exciton (FE) luminescence as a result of BEensuremath{rightarrow}FE dissociation. At constant power, the frequency distribution is found to shift to lower frequencies with increasing sheet density rather than to higher frequencies as would be expected for emission from a single subband. This can be qualiatively explained by the increase in the emission of low-frequency phonons from low-wave-number electrons in the excited subband." @default.
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- W2073696140 date "1992-05-15" @default.
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- W2073696140 title "Phonon emission from the first and second subbands of a two-dimensional electron gas in silicon detected by exciton luminescence" @default.
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- W2073696140 doi "https://doi.org/10.1103/physrevb.45.11387" @default.
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