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• W2912003669 abstract "We examine the distribution of N-In nearest-neighbor bonds in GaInNAs(Sb) quantum wells (QWs) and observe quantitatively the evolution of the distribution during thermal annealing. We use near-edge x-ray absorption fine structure to compare the behavior of compressively strained quantum wells with relaxed thick-film samples, and find no significant effect of strain on the nearest-neighbor bonding. Photoluminescence (PL) and electroreflectance (ER) spectroscopies are used to quantitatively measure the distribution of N-In nearest-neighbor states for a series of variously annealed GaInNAsSb QW samples. We find that increased annealing temperature or time leads to a blueshift of the band gap that saturates after sufficient annealing. This saturation is related to a thermodynamic equilibration of the N-In nearest-neighbor bonding in the material toward highly In-coordinated states, from an as-grown material having a nearly random bonding arrangement dominated by N-Ga bonds. The different N-In nearest-neighbor states form a fine splitting of the band gap of the material. The average spacing between these levels is found to be considerably smaller for GaInNAsSb $(ensuremath{sim}18phantom{rule{0.3em}{0ex}}mathrm{meV})$ than for GaInNAs $(ensuremath{sim}35phantom{rule{0.3em}{0ex}}mathrm{meV})$. Furthermore, we present absorption measurements that reveal an increased optical efficiency of the higher In-coordinated N states that form upon annealing. Additionally, the line shape observed at room temperature in all of the spectroscopic measurements is Gaussian, indicating a strong exciton-phonon coupling in these alloys." @default.
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• W2912003669 date "2005-03-15" @default.
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• W2912003669 title "Nearest-neighbor distributions in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mi>Ga</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>In</mml:mi><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant=normal>N</mml:mi><mml:mi>y</mml:mi></mml:msub><mml:msub><mml:mi>As</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>y</mml:mi></mml:mrow></mml:…" @default.
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• W2912003669 doi "https://doi.org/10.1103/physrevb.71.125309" @default.
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