Negatively Charged Quantum Well Polaritons in a<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>GaAs</mml:mi><mml:mi>/</mml:mi><mml:mi>AlAs</mml:mi></mml:math>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.