Two-dimensional double-quantum spectroscopy: peak shapes as a sensitive probe of carrier interactions in quantum wells

  title={Two-dimensional double-quantum spectroscopy: peak shapes as a sensitive probe of carrier interactions in quantum wells},
  author={Jonathan O. Tollerud and Jeffrey A. Davis},
  journal={Journal of The Optical Society of America B-optical Physics},
We identify carrier scattering at densities below that which has previously been observed in semiconductor quantum wells. These effects are evident in the peak shapes of 2D double-quantum spectra, which change as a function of excitation density. At high excitation densities (>109 excitons/cm2), we observe untilted peaks similar to those reported in previous experiments. At low excitation densities (<108 excitons/cm2), we observe narrower tilted peaks. Using a simple simulation, we show that… 

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