Optical near-field mapping of excitons and biexcitons in naturally occurring semiconductor quantum dots

Hohenester, Ulrich; Goldoni, Guido; Molinari, Elisa
May 2004
Applied Physics Letters;5/17/2004, Vol. 84 Issue 20, p3963
Academic Journal
We calculate the near-field optical spectra of excitons and biexcitons in semiconductor quantum dots naturally occurring at interface fluctuations in GaAs-based quantum wells, using a nonlocal description of the response function to a spatially modulated electromagnetic field. The relative intensity of the lowest, far-field forbidden excitonic states is predicted; the spatial extension of the ground biexciton state is found, in agreement with recently published experiments.


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