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- W1976975921 abstract "We report luminescence studies of pulse photoexcited, indirect-gap ${mathrm{Al}}_{x}{mathrm{Ga}}_{1ensuremath{-}x}mathrm{As}$ in the temperature range of 2-150 K. Two spectral features are observed: excitons scattered by random potential fluctuations, and the electron-hole plasma (EHP). For $0.44ensuremath{le}xensuremath{le}0.53$ we find a plasma density between 0.5ifmmodetimeselsetexttimesfi{}${10}^{19}$ ${mathrm{cm}}^{ensuremath{-}3}$. The plasma binding energy, relative to the free exciton, is very small and may be negative. A strong no-phonon band is observed, which we attribute to scattering by potential fluctuations, as well as momentum-conserving phonon-assisted transitions. The lifetime of the EHP below 20 K is about five times shorter than that of the intrinsic exciton and is predominantly radiative. There is good, if not definitive, evidence that plasma-exciton phase separation occurs. Stimulated emission from the EHP is observed in nominally undoped, indirect-gap material, for $xensuremath{le}0.46$. Further spectral features are present at moderate to high excitation, which may result from multiexciton complexes." @default.
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- W1976975921 title "Electron-hole plasma in photoexcited indirect-gap<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Al</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Ga</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mi mathvariant=normal>As</mml:mi></mml:math>" @default.
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- W1976975921 doi "https://doi.org/10.1103/physrevb.22.771" @default.
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