title: Crossover from exciton to biexciton polaritons in semiconductor microcavities
abstract: Pump-probe measurements in a microcavity containing a quantum well show that a population of circularly polarized ( sigma(+)) excitons can completely inhibit the transition to sigma(-) one-exciton states by transferring the oscillator strength to the biexcitonic resonance. With increasing pump intensity the linear exciton-polariton doublet evolves into a triplet polariton structure and finally into a shifted biexciton-polariton doublet. A theoretical model of interacting excitons demonstrates that the crossover from exciton to biexciton polaritons is driven by three-exciton Coulomb correlation.
authors.affiliation: Physics Department, Federal Institute of Technology, PH-Ecublens, CH-1015 Lausanne, Switzerland.
authors.initials: M
authors.lastname: Saba
authors.initials: F
authors.lastname: Quochi
authors.initials: C
authors.lastname: Ciuti
authors.initials: U
authors.lastname: Oesterle
authors.initials: JL
authors.lastname: Staehli
authors.initials: B
authors.lastname: Deveaud
authors.initials: G
authors.lastname: Bongiovanni
authors.initials: A
authors.lastname: Mura