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- W2034263516 abstract "The infrared transmission spectrum of Si-doped molecular beam epitaxy (MBE)-grown GaAs epilayers, $2--2.5ensuremath{-}ensuremath{mu}mathrm{m}$ thick, measured in the oblique (Berreman) geometry, revealed distinct minima in p polarization. Given epilayer thickness $ensuremath{ll}$ reststrahlen wavelength, the minima are identified as the zone-center transverse optic phonon $({ensuremath{omega}}_{mathrm{TO}})$ and the high-frequency LO phonon-plasmon coupled mode $({ensuremath{omega}}_{+}).$ Analysis of the experimental data yielded free-carrier concentrations ranging from $2.5ifmmodetimeselsetexttimesfi{}{10}^{17}$ to $1.4ifmmodetimeselsetexttimesfi{}{10}^{18}{mathrm{cm}}^{ensuremath{-}3}.$ The same technique with MBE-grown Si-doped ${mathrm{In}}_{0.53}{mathrm{Ga}}_{0.47}mathrm{As}$ epilayers $(0.5--1ensuremath{mu}mathrm{m}$ thick) yielded ${ensuremath{omega}}_{+}$ modes corresponding to free-carrier concentrations of $8.2ifmmodetimeselsetexttimesfi{}{10}^{16}--2.7ifmmodetimeselsetexttimesfi{}{10}^{19}{mathrm{cm}}^{ensuremath{-}3}.$ The observations of the transmission minima in the Berreman geometry and their interpretation demonstrate a direct and simple method for deducing free-carrier concentrations over a wide range." @default.
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- W2034263516 date "2004-02-26" @default.
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- W2034263516 title "Direct observation of LO phonon-plasmon coupled modes in the infrared transmission spectra of<i>n</i>-GaAs and<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>n</mml:mi><mml:mo>−</mml:mo><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>In</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:mi>−</mml:mi><mml:mi>x…" @default.
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- W2034263516 doi "https://doi.org/10.1103/physrevb.69.075314" @default.
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