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Longitudinal optical phonon assisted relaxation of excitons due to intersubband transitions in quantum wells

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3 Author(s)
Oh, I.-K. ; Faculty of Science, Information Technology and Education (SITE) B-28 Northern Territory University, Darwin, NT 0909, Australia ; Singh, Jai ; Vengurlekar, A.S.

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Longitudinal optical phonon assisted relaxation of excitons involving intersubband transitions is studied in quantum wells. Considering the relaxation of an exciton from a higher subband to a free electron–hole pair in lower subbands by longitudinal optical phonon emission, we calculate the rate of relaxation as a function of exciton density, temperature, and wave vector K|| of the center-of-mass of exciton in quantum wells. The theory is finally applied to GaAs quantum wells and results are compared with experiment. © 2002 American Institute of Physics.

Published in:

Journal of Applied Physics  (Volume:91 ,  Issue: 9 )