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- W2087986112 abstract "We investigate the dephasing of heavy-hole excitons in different free-standing ${mathrm{ZnS}}_{x}{mathrm{Se}}_{1ensuremath{-}x}/mathrm{ZnSe}$ layer structures by spectrally resolved transient four-wave mixing. ZnSe layers of 80, 8, and 4 nm thickness with ternary barriers are studied, representing the crossover from quasi-three-dimensional to quasi-two-dimensional excitons. A common feature of the four-wave-mixing signals is the appearance of two components, a prompt signature and a delayed photon echo, which are identified by their different polarization dependencies and decay times. For crosslinear polarized fields, the rapidly decaying signal is attributed to the response of spin-coupled exciton states, with a decay time given by the inhomogeneous broadening. The photon echo is due to a distribution of localized, noninteracting excitons. We determine the exciton-exciton and exciton-phonon scattering cross sections for different dimensionalities by the intensity and temperature dependencies of the exciton dephasing." @default.
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- W2087986112 date "1997-11-15" @default.
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- W2087986112 title "Coherent optical nonlinearities and phase relaxation of quasi-three-dimensional and quasi-two-dimensional excitons in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>ZnS</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>Se</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi>−</mml:mi><mml:mi>x</mml:mi></mml:mrow></mml:…" @default.
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- W2087986112 doi "https://doi.org/10.1103/physrevb.56.12581" @default.
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