Effect of inhomogeneous broadening on optical properties of excitons in quantum wells

Resonant Rayleigh Scattering of Exciton-Polaritons in Multiple Quantum Wells

“…In our approach, the dielectric response of QWs containing inhomogeneously broadened exciton resonances is described in the framework of the nonlocal model [12]. The parameters used for the individual QWs are the 650 0031-9007͞00͞85(3)͞650(4)$15.00 © 2000 The American Physical Society exciton radiative damping rate G 0 , the nonradiative homogeneous broadening g, and the Gaussian inhomogeneous broadening D. For a MQW structure, we index by z j the coordinate of each QW and calculate the electric fields E g ͑z j , v͒ g͑v͒E͑z j , v͒ (with j varying from 1 to N), where E͑z, v͒ is the stationary solution of the Maxwell equations corresponding to a plane light-wave incident on the structure from the left, and g͑v͒ is the spectral function of the incident pulse.…”

Many-Body Interaction Evidenced through Exciton-Trion-Electron Correlated Dynamics

“…A transfer matrix approach takes into account the precise structure of the sample and yields simulated reflectivity and absorption spectra. The exciton and the trion resonances in the well are introduced by adding two frequency-dependant Lorentzian lines to the constant complex dielectric background [17]. These contributions to the dielectric function should not be properly Lorentzians because electron scatterings broaden and asymmetrize to the lines [18].…”

Vertical motional narrowing of exciton polaritons in GaN based multiple quantum wells

“…1, one can see that the exciton inhomogeneous broadening induces a dramatic decrease of the decay time of the time-resolved reflection. This reflects appearance of additional channels of energy relaxation for excitons as the disorder increases in the structure [8]. Note the strong decrease of the exciton decay time with increase of the number of QWs in the structure.…”

“…Solving the Maxwell equations within the non-local dielectric response theory [8], one can find the amplitude reflection coefficient for light incident on a single quantum well (SQW) characterized by the response function (1) in form: …”

“…According to the semi-classical model [8], the exciton inhomogeneous broadening can be accounted for by averaging of the non-local dielectric susceptibility with a continuous distribution function of the exciton resonance frequency (chosen to be a Gaussian function for simplicity):…”