Exciton beats in GaAs quantum wells: bosonic representation and collective effects
نویسندگان
چکیده
منابع مشابه
Charged exciton dynamics in GaAs quantum wells
We study the dynamics of the charged and neutral excitons in a modulation-doped GaAs quantum well by time-resolved photoluminescence under a resonant excitation. The radiative lifetime of the charged exciton is found to be surprisingly short, 60 ps. This time is temperature independent between 2 and 10 K, and increases by a factor of 2 at 6 T. We discuss our findings in view of present theories...
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We have found experimentally, that the exciton luminescence rise times in GaAdAlGaAs quantum wells oscillate as a function of incident laser energies. Guided by MonkCarlo simulations we interpret these results as the occurrence of selective LO-phonon assisted exciton formation. In the photoexcitation of semiconductors excitons can be generated either directly with high momentum or by free elect...
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متن کاملExciton front propagation in photoexcited GaAs quantum wells
Sen Yang,1 L. V. Butov,1 L. S. Levitov,2 B. D. Simons,3 and A. C. Gossard4 1Department of Physics, University of California at San Diego, La Jolla, California 92093-0319, USA 2Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA 3Cavendish Laboratory, Madingley Road, Cambridge CB3 OHE, United Kingdom 4Materials Department, University of California at...
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In this study, we report the effect of the excitation of non-exciton components caused by broadband pulses on quantum beat oscillation. Using a spectrally controlled pump pulse, a long-lived oscillation is clearly observed, and the pump-power dependence shows the suppression of the dephasing rate of the oscillation. Our results from incoherent carrier generation using a continuous wave laser de...
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ژورنال
عنوان ژورنال: Solid State Communications
سال: 1999
ISSN: 0038-1098
DOI: 10.1016/s0038-1098(99)00427-5