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• W1997923260 startingPage "10901" @default.
• W1997923260 abstract "By time-of-flight studies, the lateral transport of two-dimensional excitons in GaAs/${mathrm{Ga}}_{1mathrm{ensuremath{-}}mathrm{x}}$${mathrm{Al}}_{mathrm{x}}$As quantum wells is studied with a very high spatial resolution (ensuremath{sim}0.1 ensuremath{mu}m) provided by laterally microstructured masks. The motion of the excitons is investigated for different quantum-well widths over a wide temperature range and can be described entirely by isothermal diffusion. In particular, at low temperatures the diffusivity strongly decreases with decreasing well width. The low-temperature mobilities are found to be mainly determined by interface-roughness scattering. In the range where acoustic-deformation-potential scattering is dominant, the mobility of the excitons as a function of temperature and well width is found to agree with the corresponding theoretical mobility limits. The excitonic scattering condition describes the experiment much better than the ambi- polar scattering condition. The comparison of experimental results and calculated mobility limits shows that barrier-alloy disorder scattering significantly affects the mobilities of excitons only in narrow GaAs/${mathrm{Ga}}_{1mathrm{ensuremath{-}}mathrm{x}}$${mathrm{Al}}_{mathrm{x}}$As quantum wells." @default.
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• W1997923260 date "1989-05-15" @default.
• W1997923260 modified "2023-10-17" @default.
• W1997923260 title "Optical investigations on the mobility of two-dimensional excitons in GaAs/<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Ga</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi mathvariant=normal>−</mml:mi><mml:mi mathvariant=normal>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi …" @default.
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• W1997923260 doi "https://doi.org/10.1103/physrevb.39.10901" @default.
• W1997923260 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/9947901" @default.
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