Exciton-cavity Detuning Research Articles

Biexcitons and dark states in semiconductor microcavities

We analyze the formation of two-dimensional biexcitons and the role of exciton dark states decoupled from the cavity mode in semiconductor microcavities containing a few resonating quantum wells. A general formalism is presented for the treatment of excitons, photon modes and biexcitons in resonating microcavities. Scattering by disorder is also considered. The interface disorder seen by cavity polaritons is shown to be reduced by averaging along the cavity axis. The spectral narrowing of cavity polariton lines is discussed. Results for the biexciton binding energy, radius and damping are discussed in the physically relevant cases. The cavity biexciton photoluminescence spectra are found to be qualitatively different depending on the relative magnitudes of the exciton-cavity detuning, the biexciton binding energy, the exciton photon coupling and the damping.

Biexcitons and dark states in semiconductor microcavities

We analyze the formation of two-dimensional biexcitons and the role of exciton dark states decoupled from the cavity mode in semiconductor microcavities containing a few resonating quantum wells. Although optically inactive, the dark levels are important because they contribute states available to the excitons. A general formalism is presented for the treatment of excitons, photon modes, and biexcitons in resonating microcavities. Scattering by disorder and phonons is also considered. Results for the biexciton binding energy, radius, and damping are discussed in the physically relevant cases. The cavity biexciton photoluminescence spectra are also investigated; they are found to be qualitatively different depending on the relative magnitudes of the exciton-cavity detuning, the biexciton binding energy, the exciton–photon coupling, and the damping.

Biexciton Luminescence in Semiconductor Microcavities

We analyse the formation of two-dimensional biexcitons and their luminescence spectra in semiconductor microcavities containing a few resonating quantum wells. A general formalism is presented for the treatment of excitons, photon modes and biexcitons in resonating microcavities, including the exciton dark states decoupled from the cavity mode. Results for the biexciton binding energy, radius and damping are discussed in the physically relevant cases. The cavity biexciton photoluminescence spectra are also investigated; they are found to be qualitatively different depending on the relative magnitudes of the exciton–cavity detuning, the biexciton binding energy, the exciton–photon coupling and the damping.

Time-resolved spontaneous emission of excitons in a microcavity: Behavior of the individual exciton-photon mixed states.

Low-temperature time-resolved luminescence experiments with 3-ps resolution have been performed on quantum-well excitons embedded in a nonguiding half-wave microcavity that displays the exciton-photon mode splitting. The spontaneous-emission dynamics of each of the two split components was studied as a function of the exciton-cavity detuning under resonant optical excitation. The spontaneous-emission decay rate is significantly modified with respect to the cavityless situation and its detuning dependence is accounted for by the strong radiative coupling between the radiant exciton states and the cavity photon modes. \textcopyright{} 1996 The American Physical Society.