Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-01-12
Phys. Rev. B 77, 075324 (2008)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Published in Physical Review B. 29 pages, 12 figures
Scientific paper
10.1103/PhysRevB.77.075324
A transition between the strong (coherent) and weak (incoherent) coupling limits of resonant interaction between quantum well (QW) excitons and bulk photons is analyzed and quantified as a function of the incoherent damping rate caused by exciton-phonon and exciton-exciton scattering. For confined QW polaritons, a second, anomalous, damping-induced dispersion branch arises and develops with increasing damping. In this case, the strong-weak coupling transition is attributed to a critical damping rate, when the intersection of the normal and damping-induced dispersion branches occurs. For the radiative states of QW excitons, i.e., for radiative QW polaritons, the transition is described as a qualitative change of the photoluminescence spectrum at grazing angles along the QW structure. Furthermore, we show that the radiative corrections to the QW exciton states with in-plane wavevector approaching the photon cone are universally scaled by an energy parameter rather than diverge. The strong-weak coupling transition rates are also proportional to the same energy parameter. The numerical evaluations are given for a GaAs single quantum well with realistic parameters.
Creatore Celestino
Ivanov A. L.
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