title: Negatively charged quantum well polaritons in a GaAs/AlAs microcavity: An analog of atoms in a cavity
abstract: The negatively charged exciton (X-) is observed to strongly couple with the microcavity- (MC-)confined photons in a GaAs quantum well containing a two-dimensional electron gas with 0<n(e)</=3x10(10) cm(-2). This strong coupling results in a formation of charged polaritons. The coupling strength is found to depend on sqrt[n(e)], in analogy to two-level atoms in a cavity. The analysis of the reflection and photoluminescence spectra shows that X- is strongly admixed with the neutral exciton via their coupling with the MC photons. The linewidth dependence on n(e) indicates that electron-polariton scattering is effective.
authors.affiliation: Solid State Institute, Technion-Israel Institute of Technology, Haifa 32000, Israel.
authors.initials: R
authors.lastname: Rapaport
authors.initials: R
authors.lastname: Harel
authors.initials: E
authors.lastname: Cohen
authors.initials: A
authors.lastname: Ron
authors.initials: E
authors.lastname: Linder
authors.initials: LN
authors.lastname: Pfeiffer