Observation of a dynamical mixing process of exciton-polaritons in a ZnSe epitaxial layer using four-wave mixing spectroscopy

摘要

We have observed a coherent spectral change of exciton-polaritons in a ZnSe epitaxial layer through spectrally resolved four-wave mixing spectroscopy. The spectra exhibit an exchange of the dominant peak position between the different polariton branches depending on the delay time of the second pulse. This result reflects the initial creation process of polaritons with many-body interactions. The calculation based on the exciton-photon microscopic model reveals that the spectral change occurs due to the four-particle correlations between heavy-hole and light-hole excitons; it clearly shows the dynamical mixing process of exciton-polaritons in the initial creation.