Biexcitons or bipolaritons in a semiconductor microcavity?

Abstract

Summary form only given. Due to the possibility of realizing strong exciton-photon coupling in semiconductor microcavities, one could expect that also biexcitons are strongly modified by polariton effects, leading to formation of bipolaritons. In this work, we have investigated the nonlinear optical properties of a high-quality quantum well (QW) microcavity in time-resolved pump-probe spectroscopy at T=5 K. The sample consists of a 25 nm GaAs single QW in the center of a wedged /spl lambda/-cavity with AlAs-AlGaAs Bragg reflectors.