Negatively charged quantum well polaritons in a GaAs/AlAs microcavity: An analog of atoms in a cavity
14 February 2000
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) less than or equal to 3 X 10(10) cm(-2). This strong coupling results in a formation of charged polaritons. The coupling strength is found to depend on root n(e), in analogy to two-level atoms in a cavity. The analysis of the reflection and photoluminescence spectra shows that X(-) is strongly admired with the neutral exciton via their coupling with the MC photons. The linewidth dependence on n(e) indicates that electron-polariton scattering is effective.