Abstract
We observe coherent exciton-LO-phonon polarons in a $3\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ ZnSe single quantum well using four-wave mixing with $30\phantom{\rule{0.3em}{0ex}}\mathrm{fs}$ light pulses. The formation of these superposition states is attributed to a strong LO-phonon coupling by the Fr\"ohlich interaction in a system in which the exciton binding exceeds the LO-phonon energy and the $2s$ exciton is nearly resonant with the LO-phonon energy. The rapid decay of these coherent quasiparticles is mainly attributed to the disintegration into zero-phonon excitons and free LO phonons as well as to the inhomogeneous broadening of LO-phonon energies due to disorder and $\mathbf{k}$-space dispersion.
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