Many-body two-quantum coherences in semiconductor nanostructures
Denis Karaiskaj, Alan D. Bristow, Lijun Yang, Xingcan Dai, Richard P., Mirin, Shaul Mukamel, and Steven T. Cundiff
TL;DR
This paper demonstrates the use of two-dimensional Fourier transform spectroscopy to identify many-body interactions in semiconductor quantum wells, distinguishing them from bound biexcitons through experimental and simulated analysis.
Contribution
It introduces a method to isolate and analyze two-quantum coherences in semiconductor nanostructures, highlighting the dominance of many-body interactions over biexcitons.
Findings
Spectra dominated by many-body two-quantum coherences
Simulations agree with experimental results
Method distinguishes many-body effects from biexcitons
Abstract
We present experimental coherent two-dimensional Fourier transform spectra of the exciton resonances in semiconductor quantum wells for a pulse sequence that isolates two-quantum coherences. By measuring the real part of the spectra, we can determine that the spectra are dominated by two quantum coherences due to many-body interactions, not bound biexcitons. Simulations performed using dynamics controlled truncation agree well with the experiments.
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