Two-quantum many-body coherences in two-dimensional fourier-transform spectra of exciton resonances in semiconductor quantum wells

Denis Karaiskaj, Alan D Bristow, Lijun Yang, Xingcan Dai, Richard P Mirin, Shaul Mukamel, Steven T Cundiff
Physical Review Letters 2010 March 19, 104 (11): 117401
We present experimental coherent two-dimensional Fourier-transform spectra of Wannier exciton resonances in semiconductor quantum wells generated by a pulse sequence that isolates two-quantum coherences. By measuring the real part of the signals, we determine that the spectra are dominated by two-quantum coherences due to mean-field many-body interactions, rather than bound biexcitons. Simulations performed using dynamics controlled truncation agree with the experiments.

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