Exciton phonon bound states in II-VI quantum wells

Summary form only given. Under certain conditions the attractive Frohlich interaction between the optical phonon and exciton states may result in the formation of exciton-phonon bound states (EPBS). EPBS are manifested as distinct absorption features about 90% of the optical phonon energy above the lowest exciton state and were first observed in bulk ionic insulators and semiconductors with enhanced polarity such as CdS, CdSe and CdTe. Here we report, for the first time in lower dimensional systems, the observation of EPBS in CdTe-CdZnTe quantum wells (QWs).