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Optical dephasing of homogeneously broadened two-dimensional exciton transitions in GaAs quantum wells

✍ Scribed by Schultheis, L.; Honold, A.; Kuhl, J.; Köhler, K.; Tu, C. W.

Book ID
121737652
Publisher
The American Physical Society
Year
1986
Tongue
English
Weight
282 KB
Volume
34
Category
Article
ISSN
1098-0121

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✦ Synopsis

%e report optical dephasing of two-dimensional excitons in GaAs-A1"Gai-, As single quantum wells by means of time-resolved degenerate-four-wave mixing and transmission experiments in the temperature range below 80 K. The observed absorption linewidths correspond directly to the ex- citonie phase coherence times, confirming the homogeneous broadening of the excitonic absorp- tion. A linear temperature dependence of the homogeneous linewidth indicates acoustic-phonon '

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We report the first measurements of the interaction of non-equilibrium phonons with twodimensional exciton gases (2DExGs). The rise in the effective temperature of the 2DExG produced by the phonons depends on the width of the quantum well and the exciton sheet density and hence on the ratio 5 -l (ex