Spectrally resolved four-wave mixing in semiconductors: Influence of inhomogeneous broadening

Abstract

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Dephasing in InAs/GaAs quantum dots

“…3 and the corresponding T 2 times are indicated. The simulations contain qualitatively all the features of the experimental data, like the initial increase of the signal maximum for increasing , not expected for delta-pulses, 13 and the time shift of the signal for long delay times. Also, the simulations are in quantitative agreement with the measurements at long delay times.…”

Coherent optical nonlinearities and phase relaxation of quasi-three-dimensional and quasi-two-dimensional excitons inZnSxSe1−xWägner1, Schätz2, Maier3 et al. 1997Phys. Rev. BSelf Cite354130View full textAdd to dashboardCite

“…10,[13][14][15] The underlying physics is approximately described by the optical Bloch equations. [16][17][18] The Coulomb interaction and the fermionic nature of the carriers, however, complicate this description so that the use of the semiconductor Bloch equations is generally more appropriate. 19,20 So far these coherent phenomena have been mainly studied in high-quality thin-film III-V layer structures.…”

Binding-energy distribution and dephasing of localized biexcitons

“…This mechanism was previously predicted for the quantum beat in a V-type tree-level system such as the heavy-hole-light-hole exciton system. 24,25 In the excitonbiexciton case, we have to consider an E-type level system, which is depicted schematically in Fig. 5.…”

“…To model the experiments quantitatively, taking into account the exciton and the biexciton transitions as well as their inhomogeneous broadening and the inhomogeneous width of the biexciton binding energy, we follow the analytical approach of Erland et al 24 We use a Gaussian distribution function g(␦ X ,␦ B ,) describing the inhomogeneous broadening ⌫ X and ⌫ B of the exciton ( X ) and biexciton ( B ) transition frequencies, with the correlation parameter 0рр1, given by g͑␦ X ,␦ B , ͒ϭ 4 ln͑2͒…”